Balls

304 Products in this selection
Combined category including sub-categories of balls. These include rubber, metallic, plastic, bored, inspection, glass, ceramic, tooling, fixture, and checking.
Small Parts & Bearings

Additional resources:
Balls Master Catalogue PDF
AFBMA and ISO Ball Grades

A more comprehensive listing may be found on the MBA Minibearings main store at Balls.
Diameter (D) Material Precision Hardness Properties Colour Indicative
Image
Diameter (D)
3.175
mm
+/- 0.01270
(Equiv. 0.125 in.)
Material
316 Stainless
Precision
ISO 3290 Grade 100
Hardness
25-39 Rockwell C
Properties
Resistant to severe corrosive conditions
Colour
Silver
Metallic Balls - 3.175 mm 316 Stainless - ISO 3290 Grade 100 Ball
Material: Stainless Steel 316 (Similar to A4, 18-10)    Specific Gravity: 7.972   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00318-S6-G100 (PK-100) Metallic Balls - 3.175 mm 316 Stainless - ISO 3290 Grade 100 Ball
251 units (25100 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$6.14 AUD
$6.14 AUD
Per 100
Diameter (D) Material Precision Hardness Indicative
Image
Diameter (D)
3.175
mm
+/- 0.01270
(Equiv. 0.125 in.)
Material
316 Stainless
Precision
ISO 3290 Grade 100
Hardness
25-39 Rockwell C
Metallic Balls - 3.175 mm 316 Stainless - ISO 3290 Grade 100 Ball
Material: Stainless Steel 316 (Similar to A4, 18-10)    Properties: Resistant to severe corrosive conditions    Colour: Silver    Specific Gravity: 7.972   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00318-S6-G100 (PK-100) Metallic Balls - 3.175 mm 316 Stainless - ISO 3290 Grade 100 Ball
251 units (25100 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$6.14 AUD
$6.14 AUD
Per 100
View the product page first if you are unsure.
Diameter (D)
3.175
mm
+/- 0.00254
(Equiv. 0.125 in.)
Material
420 Stainless
Precision
ISO 3290 Grade 20
Hardness
55-60 Rockwell C
Properties
Commonly used in precision bearings. Corrosion resistant.
Colour
Silver
Metallic Balls - 3.175 mm 420 Stainless - ISO 3290 Grade 20 Ball
Material: Stainless Steel AISI 420C Rc 46-52    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00318-S420-G28 (PK-100) Metallic Balls - 3.175 mm 420 Stainless - ISO 3290 Grade 20 Ball
205 units (20500 pcs) Available Now | Further orders can be expected around Mon, Aug 17, 2026
$10.95 AUD
$10.95 AUD
Per 100
Diameter (D)
3.175
mm
+/- 0.00254
(Equiv. 0.125 in.)
Material
420 Stainless
Precision
ISO 3290 Grade 20
Hardness
55-60 Rockwell C
Metallic Balls - 3.175 mm 420 Stainless - ISO 3290 Grade 20 Ball
Material: Stainless Steel AISI 420C Rc 46-52    Properties: Commonly used in precision bearings. Corrosion resistant.    Colour: Silver    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00318-S420-G28 (PK-100) Metallic Balls - 3.175 mm 420 Stainless - ISO 3290 Grade 20 Ball
205 units (20500 pcs) Available Now | Further orders can be expected around Mon, Aug 17, 2026
$10.95 AUD
$10.95 AUD
Per 100
View the product page first if you are unsure.
Diameter (D)
3.175
mm
+/- 0.00254
(Equiv. 0.125 in.)
Material
440C Stainless
Precision
ISO 3290 Grade 20
Hardness
55-60 Rockwell C
Properties
Commonly used in precision bearings. Corrosion resistant.
Colour
Silver
Metallic Balls - 3.175 mm 440C Stainless - ISO 3290 Grade 20 Ball
Material: Stainless Steel AISI 440C    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00318-S440-G20 (PK-200) Metallic Balls - 3.175 mm 440C Stainless - ISO 3290 Grade 20 Ball
5 units (1000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$4.32 AUD
$4.32 AUD
Per 200
Diameter (D)
3.175
mm
+/- 0.00254
(Equiv. 0.125 in.)
Material
440C Stainless
Precision
ISO 3290 Grade 20
Hardness
55-60 Rockwell C
Metallic Balls - 3.175 mm 440C Stainless - ISO 3290 Grade 20 Ball
Material: Stainless Steel AISI 440C    Properties: Commonly used in precision bearings. Corrosion resistant.    Colour: Silver    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00318-S440-G20 (PK-200) Metallic Balls - 3.175 mm 440C Stainless - ISO 3290 Grade 20 Ball
5 units (1000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$4.32 AUD
$4.32 AUD
Per 200
View the product page first if you are unsure.
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Acetal
Precision
Grade 1
Hardness
118 Rockwell R
Properties
High intensity strength, rigidity, outstanding resistance to abrasion and most solvents.
Colour
Off White
Plastic Balls - 3.18 mm Acetal - Grade 1 Ball
Material: Acetal    Specific Gravity: 1.4   
Category: Balls - Plastic - Acetal
Part Number: BL-00318-AC (PK-20) Plastic Balls - 3.18 mm Acetal - Grade 1 Ball
553 units (11060 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$2.23 AUD
$2.23 AUD
Per 20
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Acetal
Precision
Grade 1
Hardness
118 Rockwell R
Plastic Balls - 3.18 mm Acetal - Grade 1 Ball
Material: Acetal    Properties: High intensity strength, rigidity, outstanding resistance to abrasion and most solvents.    Colour: Off White    Specific Gravity: 1.4   
Category: Balls - Plastic - Acetal
Part Number: BL-00318-AC (PK-20) Plastic Balls - 3.18 mm Acetal - Grade 1 Ball
553 units (11060 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$2.23 AUD
$2.23 AUD
Per 20
View the product page first if you are unsure.
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Acrylic
Precision
Grade 3
Hardness
132 Rockwell R
Properties
Resistance to weather and sunlight
Colour
Water clear transparent
Plastic Balls - 3.18 mm Acrylic - Grade 3 Ball
Material: Acrylic    Specific Gravity: 1.19   
Category: Balls - Plastic - Acrylic
Part Number: BL-00318-ACR (PK-50) Plastic Balls - 3.18 mm Acrylic - Grade 3 Ball
54 units (2700 pcs) Available Now | Item Discontinued - Up to 54 may be ordered online. No backorders. Please contact us if you need a larger quantity
$1.09 AUD
$4.80 AUD $1.09 AUD
Per 50
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Acrylic
Precision
Grade 3
Hardness
132 Rockwell R
Plastic Balls - 3.18 mm Acrylic - Grade 3 Ball
Material: Acrylic    Properties: Resistance to weather and sunlight    Colour: Water clear transparent    Specific Gravity: 1.19   
Category: Balls - Plastic - Acrylic
Part Number: BL-00318-ACR (PK-50) Plastic Balls - 3.18 mm Acrylic - Grade 3 Ball
54 units (2700 pcs) Available Now | Item Discontinued - Up to 54 may be ordered online. No backorders. Please contact us if you need a larger quantity
$1.09 AUD
$4.80 AUD $1.09 AUD
Per 50
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Nylon (Polyamide 6/6)
Precision
Grade 2
Hardness
108 Rockwell R
Properties
Resists alkalies, weak acids and most organic solvents.
Colour
Off White
Plastic Balls - 3.18 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
Material: Nylon (Polyamide 6/6)    Specific Gravity: 1.14   
Category: Balls - Plastic - Nylon
Part Number: BL-00318-NY (PK-50) Plastic Balls - 3.18 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
37 units (1850 pcs) Available Now | Item Discontinued - Up to 37 may be ordered online. No backorders. Please contact us if you need a larger quantity
$2.06 AUD
$9.40 AUD $2.06 AUD
Per 50
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Nylon (Polyamide 6/6)
Precision
Grade 2
Hardness
108 Rockwell R
Plastic Balls - 3.18 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
Material: Nylon (Polyamide 6/6)    Properties: Resists alkalies, weak acids and most organic solvents.    Colour: Off White    Specific Gravity: 1.14   
Category: Balls - Plastic - Nylon
Part Number: BL-00318-NY (PK-50) Plastic Balls - 3.18 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
37 units (1850 pcs) Available Now | Item Discontinued - Up to 37 may be ordered online. No backorders. Please contact us if you need a larger quantity
$2.06 AUD
$9.40 AUD $2.06 AUD
Per 50
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Polypropylene
Precision
Grade 2
Hardness
86 Rockwell R
Properties
Excellent for liquid level float applications.
Colour
White
Plastic Balls - 3.18 mm Polypropylene - Grade 2 Ball
Material: Polypropylene    Specific Gravity: 0.91   
Category: Balls - Plastic - Polypropylene
Part Number: BL-00318-PP (PK-100) Plastic Balls - 3.18 mm Polypropylene - Grade 2 Ball
12 units (1200 pcs) Available Now | Item Discontinued - Up to 12 may be ordered online. No backorders. Please contact us if you need a larger quantity
$2.06 AUD
$9.60 AUD $2.06 AUD
Per 100
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Polypropylene
Precision
Grade 2
Hardness
86 Rockwell R
Plastic Balls - 3.18 mm Polypropylene - Grade 2 Ball
Material: Polypropylene    Properties: Excellent for liquid level float applications.    Colour: White    Specific Gravity: 0.91   
Category: Balls - Plastic - Polypropylene
Part Number: BL-00318-PP (PK-100) Plastic Balls - 3.18 mm Polypropylene - Grade 2 Ball
12 units (1200 pcs) Available Now | Item Discontinued - Up to 12 may be ordered online. No backorders. Please contact us if you need a larger quantity
$2.06 AUD
$9.60 AUD $2.06 AUD
Per 100
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
PTFE
Precision
Grade 1
Hardness
68 Rockwell R
Properties
No water absorption. Temperatures up to 288 Deg C.
Colour
White
Plastic Balls - 3.18 mm PTFE - Grade 1 Ball
Material: PTFE    Specific Gravity: 2.3   
Category: Balls - Plastic - PTFE
Part Number: BL-00318-PTF (PK-20) Plastic Balls - 3.18 mm PTFE - Grade 1 Ball
15 units (300 pcs) Available Now | Item Discontinued - Up to 15 may be ordered online. No backorders. Please contact us if you need a larger quantity
$4.54 AUD
$19.22 AUD $4.54 AUD
Per 20
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
PTFE
Precision
Grade 1
Hardness
68 Rockwell R
Plastic Balls - 3.18 mm PTFE - Grade 1 Ball
Material: PTFE    Properties: No water absorption. Temperatures up to 288 Deg C.    Colour: White    Specific Gravity: 2.3   
Category: Balls - Plastic - PTFE
Part Number: BL-00318-PTF (PK-20) Plastic Balls - 3.18 mm PTFE - Grade 1 Ball
15 units (300 pcs) Available Now | Item Discontinued - Up to 15 may be ordered online. No backorders. Please contact us if you need a larger quantity
$4.54 AUD
$19.22 AUD $4.54 AUD
Per 20
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Torlon (Polyamide-imide)
Precision
Grade II
Hardness
Rockwell E86 or M109-119
Properties
High resistance to heat, high strength, dimensional stability and impact resistance.
Colour
Green-Brown
Plastic Balls - 3.18 mm Torlon - Polyamide-imide - - Grade II Ball
Material: Torlon (Polyamide-imide)    Specific Gravity: 1.38   
Category: Balls - Plastic - Torlon
Part Number: BL-00318-TO (PK-10) Plastic Balls - 3.18 mm Torlon - Polyamide-imide - - Grade II Ball
14 units (140 pcs) Available Now | Further orders can be expected around Tue, Aug 11, 2026
$9.23 AUD
$9.23 AUD
Per 10
Diameter (D)
3.18
mm
+/- 0.051
(Equiv. 0.125 in.)
Material
Torlon (Polyamide-imide)
Precision
Grade II
Hardness
Rockwell E86 or M109-119
Plastic Balls - 3.18 mm Torlon - Polyamide-imide - - Grade II Ball
Material: Torlon (Polyamide-imide)    Properties: High resistance to heat, high strength, dimensional stability and impact resistance.    Colour: Green-Brown    Specific Gravity: 1.38   
Category: Balls - Plastic - Torlon
Part Number: BL-00318-TO (PK-10) Plastic Balls - 3.18 mm Torlon - Polyamide-imide - - Grade II Ball
14 units (140 pcs) Available Now | Further orders can be expected around Tue, Aug 11, 2026
$9.23 AUD
$9.23 AUD
Per 10
View the product page first if you are unsure.
Diameter (D)
3.500
mm
+/- 0.00254
(Equiv. 0.138 in.)
Material
SAE52100 Chrome
Precision
ISO 3290 Grade 28
Hardness
60-70 Rockwell C
Properties
Commonly used in precision bearings.
Colour
Silver
Metallic Balls - 3.5 mm SAE52100 Chrome - ISO 3290 Grade 28 Ball
Material: Chrome Steel SAE 52100    Specific Gravity: 7.833   
Category: Balls - Metallic - Chrome Steel
Part Number: BL-00350-CH-G28 (PK-100) Metallic Balls - 3.5 mm SAE52100 Chrome - ISO 3290 Grade 28 Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$1.23 AUD
$1.23 AUD
Per 100
Diameter (D)
3.500
mm
+/- 0.00254
(Equiv. 0.138 in.)
Material
SAE52100 Chrome
Precision
ISO 3290 Grade 28
Hardness
60-70 Rockwell C
Metallic Balls - 3.5 mm SAE52100 Chrome - ISO 3290 Grade 28 Ball
Material: Chrome Steel SAE 52100    Properties: Commonly used in precision bearings.    Colour: Silver    Specific Gravity: 7.833   
Category: Balls - Metallic - Chrome Steel
Part Number: BL-00350-CH-G28 (PK-100) Metallic Balls - 3.5 mm SAE52100 Chrome - ISO 3290 Grade 28 Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$1.23 AUD
$1.23 AUD
Per 100
View the product page first if you are unsure.
Diameter (D)
3.500
mm
+/- 0.00254
(Equiv. 0.138 in.)
Material
440C Stainless
Precision
ISO 3290 Grade 28
Hardness
55-60 Rockwell C
Properties
Commonly used in precision bearings. Corrosion resistant.
Colour
Silver
Metallic Balls - 3.5 mm 440C Stainless - ISO 3290 Grade 28 Ball
Material: Stainless Steel AISI 440C    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00350-S440-G28 (PK-100) Metallic Balls - 3.5 mm 440C Stainless - ISO 3290 Grade 28 Ball
92 units (9200 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$5.50 AUD
$5.50 AUD
Per 100
Diameter (D)
3.500
mm
+/- 0.00254
(Equiv. 0.138 in.)
Material
440C Stainless
Precision
ISO 3290 Grade 28
Hardness
55-60 Rockwell C
Metallic Balls - 3.5 mm 440C Stainless - ISO 3290 Grade 28 Ball
Material: Stainless Steel AISI 440C    Properties: Commonly used in precision bearings. Corrosion resistant.    Colour: Silver    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00350-S440-G28 (PK-100) Metallic Balls - 3.5 mm 440C Stainless - ISO 3290 Grade 28 Ball
92 units (9200 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$5.50 AUD
$5.50 AUD
Per 100
View the product page first if you are unsure.
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
SAE52100 Chrome
Precision
AFBMA Grade 25
Hardness
60-70 Rockwell C
Properties
Commonly used in precision bearings.
Colour
Silver
Metallic Balls - 3.969 mm SAE52100 Chrome - AFBMA Grade 25 Ball
Material: Chrome Steel SAE 52100    Specific Gravity: 7.833   
Category: Balls - Metallic - Chrome Steel
Part Number: BL-00397-CH-G25 (PK-200) Metallic Balls - 3.969 mm SAE52100 Chrome - AFBMA Grade 25 Ball
245 units (49000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$4.86 AUD
$4.86 AUD
Per 200
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
SAE52100 Chrome
Precision
AFBMA Grade 25
Hardness
60-70 Rockwell C
Metallic Balls - 3.969 mm SAE52100 Chrome - AFBMA Grade 25 Ball
Material: Chrome Steel SAE 52100    Properties: Commonly used in precision bearings.    Colour: Silver    Specific Gravity: 7.833   
Category: Balls - Metallic - Chrome Steel
Part Number: BL-00397-CH-G25 (PK-200) Metallic Balls - 3.969 mm SAE52100 Chrome - AFBMA Grade 25 Ball
245 units (49000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$4.86 AUD
$4.86 AUD
Per 200
View the product page first if you are unsure.
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
Si3N4
Precision
AFBMA Grade 25
Hardness
1580 kg/mm.sq
Properties
Good wear resistance and thermal resistance
Colour
Grey
Ceramic Balls - 3.969 mm Si3N4 - AFBMA Grade 25 Silicon Nitride Ball
Material: Si3N4    Specific Gravity: 3.29   
Category: Balls - Ceramic - Silicon Nitride
Part Number: BL-00397-SN-G25 (PK-200) Ceramic Balls - 3.969 mm Si3N4 - AFBMA Grade 25 Silicon Nitride Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$278.50 AUD
$278.50 AUD
Per 200
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
Si3N4
Precision
AFBMA Grade 25
Hardness
1580 kg/mm.sq
Ceramic Balls - 3.969 mm Si3N4 - AFBMA Grade 25 Silicon Nitride Ball
Material: Si3N4    Properties: Good wear resistance and thermal resistance    Colour: Grey    Specific Gravity: 3.29   
Category: Balls - Ceramic - Silicon Nitride
Part Number: BL-00397-SN-G25 (PK-200) Ceramic Balls - 3.969 mm Si3N4 - AFBMA Grade 25 Silicon Nitride Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$278.50 AUD
$278.50 AUD
Per 200
View the product page first if you are unsure.
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
Synthetic Ruby
Precision
AFBMA Grade 25
Hardness
9 Mohs
Properties
Extreme hardness and wear resistance
Colour
Ruby
Ceramic Balls - 3.969 mm Synthetic Ruby - AFBMA Grade 25 Ball
Material: Synthetic Ruby    Specific Gravity: 3.98   
Category: Balls - Ceramic - Synthetic
Part Number: BL-00397-RY-G25 (PK-2) Ceramic Balls - 3.969 mm Synthetic Ruby - AFBMA Grade 25 Ball
2 units (4 pcs) Available Now | Item Discontinued - Up to 2 may be ordered online. No backorders. Please contact us if you need a larger quantity
$21.95 AUD
$36.59 AUD $21.95 AUD
Per 2
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
Synthetic Ruby
Precision
AFBMA Grade 25
Hardness
9 Mohs
Ceramic Balls - 3.969 mm Synthetic Ruby - AFBMA Grade 25 Ball
Material: Synthetic Ruby    Properties: Extreme hardness and wear resistance    Colour: Ruby    Specific Gravity: 3.98   
Category: Balls - Ceramic - Synthetic
Part Number: BL-00397-RY-G25 (PK-2) Ceramic Balls - 3.969 mm Synthetic Ruby - AFBMA Grade 25 Ball
2 units (4 pcs) Available Now | Item Discontinued - Up to 2 may be ordered online. No backorders. Please contact us if you need a larger quantity
$21.95 AUD
$36.59 AUD $21.95 AUD
Per 2
Diameter (D)
3.969
mm
+/- 0.01270
(Equiv. 0.156 in.)
Material
Tungsten Carbide
Precision
ISO 3290 Grade 24
Hardness
91.5 Rockwell A
Properties
Extreme Hardness and wear resistance.
Colour
Dull Grey
Metallic Balls - 3.969 mm Tungsten Carbide - ISO 3290 Grade 24 Ball
Material: Tungsten Carbide    Specific Gravity: 14.95   
Category: Balls - Metallic - Tungsten Carbide
Part Number: BL-00397-TC-G24 (Each) Metallic Balls - 3.969 mm Tungsten Carbide - ISO 3290 Grade 24 Ball
1 Available Now | Further orders can be expected around Sun, Jul 26, 2026
$11.32 AUD
$13.58 AUD $11.32 AUD
Each
Diameter (D)
3.969
mm
+/- 0.01270
(Equiv. 0.156 in.)
Material
Tungsten Carbide
Precision
ISO 3290 Grade 24
Hardness
91.5 Rockwell A
Metallic Balls - 3.969 mm Tungsten Carbide - ISO 3290 Grade 24 Ball
Material: Tungsten Carbide    Properties: Extreme Hardness and wear resistance.    Colour: Dull Grey    Specific Gravity: 14.95   
Category: Balls - Metallic - Tungsten Carbide
Part Number: BL-00397-TC-G24 (Each) Metallic Balls - 3.969 mm Tungsten Carbide - ISO 3290 Grade 24 Ball
1 Available Now | Further orders can be expected around Sun, Jul 26, 2026
$11.32 AUD
$13.58 AUD $11.32 AUD
Each
View the product page first if you are unsure.
Diameter (D)
3.969
mm
+/- 0.01270
(Equiv. 0.156 in.)
Material
304 Stainless
Precision
ISO 3290 Grade 100
Hardness
25-39 Rockwell C
Properties
Low magnetic permeability. Good corrosion resistance
Colour
Silver
Metallic Balls - 3.969 mm 304 Stainless - ISO 3290 Grade 100 Ball
Material: Stainless Steel 304 (Similar to A2, 18-8) HRB80    Specific Gravity: 7.916   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00397-S4-G100 (PK-500) Metallic Balls - 3.969 mm 304 Stainless - ISO 3290 Grade 100 Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$12.23 AUD
$12.23 AUD
Per 500
Diameter (D)
3.969
mm
+/- 0.01270
(Equiv. 0.156 in.)
Material
304 Stainless
Precision
ISO 3290 Grade 100
Hardness
25-39 Rockwell C
Metallic Balls - 3.969 mm 304 Stainless - ISO 3290 Grade 100 Ball
Material: Stainless Steel 304 (Similar to A2, 18-8) HRB80    Properties: Low magnetic permeability. Good corrosion resistance    Colour: Silver    Specific Gravity: 7.916   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00397-S4-G100 (PK-500) Metallic Balls - 3.969 mm 304 Stainless - ISO 3290 Grade 100 Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$12.23 AUD
$12.23 AUD
Per 500
View the product page first if you are unsure.
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
440C Stainless
Precision
ISO 3290 Grade 28
Hardness
55-60 Rockwell C
Properties
Commonly used in precision bearings. Corrosion resistant.
Colour
Silver
Metallic Balls - 3.969 mm 440C Stainless - ISO 3290 Grade 28 Ball
Material: Stainless Steel AISI 440C    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00397-S440-G28 (PK-200) Metallic Balls - 3.969 mm 440C Stainless - ISO 3290 Grade 28 Ball
45 units (9000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$7.68 AUD
$7.68 AUD
Per 200
Diameter (D)
3.969
mm
+/- 0.00254
(Equiv. 0.156 in.)
Material
440C Stainless
Precision
ISO 3290 Grade 28
Hardness
55-60 Rockwell C
Metallic Balls - 3.969 mm 440C Stainless - ISO 3290 Grade 28 Ball
Material: Stainless Steel AISI 440C    Properties: Commonly used in precision bearings. Corrosion resistant.    Colour: Silver    Specific Gravity: 7.833   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00397-S440-G28 (PK-200) Metallic Balls - 3.969 mm 440C Stainless - ISO 3290 Grade 28 Ball
45 units (9000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$7.68 AUD
$7.68 AUD
Per 200
View the product page first if you are unsure.
Diameter (D)
3.969
mm
+/- 0.01270
(Equiv. 0.156 in.)
Material
316 Stainless
Precision
ISO 3290 Grade 100
Hardness
25-39 Rockwell C
Properties
Resistant to severe corrosive conditions
Colour
Silver
Metallic Balls - 3.969 mm 316 Stainless - ISO 3290 Grade 100 Ball
Material: Stainless Steel 316 (Similar to A4, 18-10)    Specific Gravity: 7.972   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00397-S6-G100 (PK-50) Metallic Balls - 3.969 mm 316 Stainless - ISO 3290 Grade 100 Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$6.59 AUD
$6.59 AUD
Per 50
Diameter (D)
3.969
mm
+/- 0.01270
(Equiv. 0.156 in.)
Material
316 Stainless
Precision
ISO 3290 Grade 100
Hardness
25-39 Rockwell C
Metallic Balls - 3.969 mm 316 Stainless - ISO 3290 Grade 100 Ball
Material: Stainless Steel 316 (Similar to A4, 18-10)    Properties: Resistant to severe corrosive conditions    Colour: Silver    Specific Gravity: 7.972   
Category: Balls - Metallic - Stainless Steel
Part Number: BL-00397-S6-G100 (PK-50) Metallic Balls - 3.969 mm 316 Stainless - ISO 3290 Grade 100 Ball
Out of Stock | Backorder Now | Orders can be expected around Fri, Jul 31, 2026
$6.59 AUD
$6.59 AUD
Per 50
View the product page first if you are unsure.
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Acetal
Precision
Grade 1
Hardness
118 Rockwell R
Properties
High intensity strength, rigidity, outstanding resistance to abrasion and most solvents.
Colour
Off White
Plastic Balls - 3.97 mm Acetal - Grade 1 Ball
Material: Acetal    Specific Gravity: 1.4   
Category: Balls - Plastic - Acetal
Part Number: BL-00397-AC (PK-200) Plastic Balls - 3.97 mm Acetal - Grade 1 Ball
70 units (14000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$3.32 AUD
$3.32 AUD
Per 200
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Acetal
Precision
Grade 1
Hardness
118 Rockwell R
Plastic Balls - 3.97 mm Acetal - Grade 1 Ball
Material: Acetal    Properties: High intensity strength, rigidity, outstanding resistance to abrasion and most solvents.    Colour: Off White    Specific Gravity: 1.4   
Category: Balls - Plastic - Acetal
Part Number: BL-00397-AC (PK-200) Plastic Balls - 3.97 mm Acetal - Grade 1 Ball
70 units (14000 pcs) Available Now | Further orders can be expected around Fri, Jul 31, 2026
$3.32 AUD
$3.32 AUD
Per 200
View the product page first if you are unsure.
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Acrylic
Precision
Grade 3
Hardness
132 Rockwell R
Properties
Resistance to weather and sunlight
Colour
Water clear transparent
Plastic Balls - 3.97 mm Acrylic - Grade 3 Ball
Material: Acrylic    Specific Gravity: 1.19   
Category: Balls - Plastic - Acrylic
Part Number: BL-00397-ACR (PK-50) Plastic Balls - 3.97 mm Acrylic - Grade 3 Ball
186 units (9300 pcs) Available Now | Item Discontinued - Up to 186 may be ordered online. No backorders. Please contact us if you need a larger quantity
$1.31 AUD
$5.80 AUD $1.31 AUD
Per 50
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Acrylic
Precision
Grade 3
Hardness
132 Rockwell R
Plastic Balls - 3.97 mm Acrylic - Grade 3 Ball
Material: Acrylic    Properties: Resistance to weather and sunlight    Colour: Water clear transparent    Specific Gravity: 1.19   
Category: Balls - Plastic - Acrylic
Part Number: BL-00397-ACR (PK-50) Plastic Balls - 3.97 mm Acrylic - Grade 3 Ball
186 units (9300 pcs) Available Now | Item Discontinued - Up to 186 may be ordered online. No backorders. Please contact us if you need a larger quantity
$1.31 AUD
$5.80 AUD $1.31 AUD
Per 50
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Nylon (Polyamide 6/6)
Precision
Grade 2
Hardness
108 Rockwell R
Properties
Resists alkalies, weak acids and most organic solvents.
Colour
Off White
Plastic Balls - 3.97 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
Material: Nylon (Polyamide 6/6)    Specific Gravity: 1.14   
Category: Balls - Plastic - Nylon
Part Number: BL-00397-NY (PK-20) Plastic Balls - 3.97 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
79 units (1580 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$4.50 AUD
$4.50 AUD
Per 20
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Nylon (Polyamide 6/6)
Precision
Grade 2
Hardness
108 Rockwell R
Plastic Balls - 3.97 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
Material: Nylon (Polyamide 6/6)    Properties: Resists alkalies, weak acids and most organic solvents.    Colour: Off White    Specific Gravity: 1.14   
Category: Balls - Plastic - Nylon
Part Number: BL-00397-NY (PK-20) Plastic Balls - 3.97 mm Nylon - Polyamide 6/6 - - Grade 2 Ball
79 units (1580 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$4.50 AUD
$4.50 AUD
Per 20
View the product page first if you are unsure.
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Polypropylene
Precision
Grade 2
Hardness
86 Rockwell R
Properties
Excellent for liquid level float applications.
Colour
White
Plastic Balls - 3.97 mm Polypropylene - Grade 2 Ball
Material: Polypropylene    Specific Gravity: 0.91   
Category: Balls - Plastic - Polypropylene
Part Number: BL-00397-PP (PK-5) Plastic Balls - 3.97 mm Polypropylene - Grade 2 Ball
772 units (3860 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$0.68 AUD
$0.68 AUD
Per 5
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Polypropylene
Precision
Grade 2
Hardness
86 Rockwell R
Plastic Balls - 3.97 mm Polypropylene - Grade 2 Ball
Material: Polypropylene    Properties: Excellent for liquid level float applications.    Colour: White    Specific Gravity: 0.91   
Category: Balls - Plastic - Polypropylene
Part Number: BL-00397-PP (PK-5) Plastic Balls - 3.97 mm Polypropylene - Grade 2 Ball
772 units (3860 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$0.68 AUD
$0.68 AUD
Per 5
View the product page first if you are unsure.
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
PTFE
Precision
Grade 1
Hardness
68 Rockwell R
Properties
No water absorption. Temperatures up to 288 Deg C.
Colour
White
Plastic Balls - 3.97 mm PTFE - Grade 1 Ball
Material: PTFE    Specific Gravity: 2.3   
Category: Balls - Plastic - PTFE
Part Number: BL-00397-PTF (PK-5) Plastic Balls - 3.97 mm PTFE - Grade 1 Ball
43 units (215 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$4.59 AUD
$4.59 AUD
Per 5
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
PTFE
Precision
Grade 1
Hardness
68 Rockwell R
Plastic Balls - 3.97 mm PTFE - Grade 1 Ball
Material: PTFE    Properties: No water absorption. Temperatures up to 288 Deg C.    Colour: White    Specific Gravity: 2.3   
Category: Balls - Plastic - PTFE
Part Number: BL-00397-PTF (PK-5) Plastic Balls - 3.97 mm PTFE - Grade 1 Ball
43 units (215 pcs) Available Now | Further orders can be expected around Fri, Sep 18, 2026
$4.59 AUD
$4.59 AUD
Per 5
View the product page first if you are unsure.
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Torlon (Polyamide-imide)
Precision
Grade II
Hardness
Rockwell E86 or M109-119
Properties
High resistance to heat, high strength, dimensional stability and impact resistance.
Colour
Green-Brown
Plastic Balls - 3.97 mm Torlon - Polyamide-imide - - Grade II Ball
Material: Torlon (Polyamide-imide)    Specific Gravity: 1.38   
Category: Balls - Plastic - Torlon
Part Number: BL-00397-TO (PK-5) Plastic Balls - 3.97 mm Torlon - Polyamide-imide - - Grade II Ball
33 units (165 pcs) Available Now | Further orders can be expected around Sun, Aug 23, 2026
$4.50 AUD
$4.50 AUD
Per 5
Diameter (D)
3.97
mm
+/- 0.051
(Equiv. 0.156 in.)
Material
Torlon (Polyamide-imide)
Precision
Grade II
Hardness
Rockwell E86 or M109-119
Plastic Balls - 3.97 mm Torlon - Polyamide-imide - - Grade II Ball
Material: Torlon (Polyamide-imide)    Properties: High resistance to heat, high strength, dimensional stability and impact resistance.    Colour: Green-Brown    Specific Gravity: 1.38   
Category: Balls - Plastic - Torlon
Part Number: BL-00397-TO (PK-5) Plastic Balls - 3.97 mm Torlon - Polyamide-imide - - Grade II Ball
33 units (165 pcs) Available Now | Further orders can be expected around Sun, Aug 23, 2026
$4.50 AUD
$4.50 AUD
Per 5
View the product page first if you are unsure.