Gauge Balls | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Diameter Diameter

	Material Material

52100 Alloy Steel

Low-Carbon Steel

S2 Tool Steel

	Tolerance Rating Tolerance Rating

Standard

Tight

	Hardness Hardness

Rockwell C55

Rockwell C60

	Heat Treatment Heat Treatment

Hardened

Case Hardened

	Yield Strength Yield Strength

44,000 psi

290,000 psi

295,000 psi

	Elongation Elongation

11%

12%

23%

	Certificate Certificate

	Material Certificate with Traceable Lot Number

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Specifications Met Specifications Met

ASTM A295

ASTM A681

	Mechanical Finish Mechanical Finish

146 Products

About Tool Steel

About Carbon Steel, Alloy Steel, Spring Steel, and Cast Iron

Yield Strength: 295,000 psi
Hardness: Rockwell C60 (Very Hard)
Specifications Met: See table

Also known as chrome steel, 52100 is an extremely hard and wear-resistant material. These balls are often used in bearings.

For technical drawings and 3-D models, click on a part number.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Mirror-Like
Dia.	Dia. Tolerance	Heat Treatment	Specifications Met	Pkg. Qty.		Pkg.
0.026"	-0.0001" to 0.0001"	Hardened	ASTM A295	500	00000000	000000
1/32"	-0.0001" to 0.0001"	Hardened	ASTM A295	500	00000000	00000
0.043"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
3/64"	-0.0001" to 0.0001"	Hardened	__	100	00000000	00000
0.0512"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.0565"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.058"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
1/16"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
0.0656"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.072"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.0761"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
5/64"	-0.0001" to 0.0001"	Hardened	__	100	00000000	00000
0.0833"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	0000000	0000
0.09"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
3/32"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
0.0953"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.0975"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.0981"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.101"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
7/64"	-0.0001" to 0.0001"	Hardened	__	100	00000000	00000
1/8"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
0.1292"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.1345"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
0.137"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	0000
9/64"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
5/32"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
11/64"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
3/16"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
0.194"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	00000
7/32"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
0.2372"	-0.0001" to 0.0001"	Hardened	ASTM A295	100	00000000	00000
1/4"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
17/64"	-0.0001" to 0.0001"	Hardened	__	100	0000000	00000
9/32"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
5/16"	-0.0001" to 0.0001"	Hardened	__	100	0000000	0000
11/32"	-0.0001" to 0.0001"	Hardened	__	100	0000000	00000
3/8"	-0.0001" to 0.0001"	Hardened	__	100	0000000	00000
13/32"	-0.0001" to 0.0001"	Hardened	__	100	0000000	00000
7/16"	-0.0001" to 0.0001"	Hardened	__	100	0000000	00000
15/32"	-0.0001" to 0.0001"	Hardened	__	50	0000000	00000
1/2"	-0.0001" to 0.0001"	Hardened	__	50	0000000	00000
17/32"	-0.0001" to 0.0001"	Hardened	__	50	0000000	00000
9/16"	-0.0001" to 0.0001"	Hardened	__	50	0000000	00000
19/32"	-0.0001" to 0.0001"	Hardened	__	25	0000000	00000
5/8"	-0.0001" to 0.0001"	Hardened	__	25	0000000	00000
21/32"	-0.0001" to 0.0001"	Hardened	__	25	0000000	00000
11/16"	-0.0001" to 0.0001"	Hardened	__	25	0000000	00000
23/32"	-0.0001" to 0.0001"	Hardened	__	25	0000000	00000
3/4"	-0.0001" to 0.0001"	Hardened	__	25	0000000	00000
25/32"	-0.0001" to 0.0001"	Hardened	__	10	0000000	0000
13/16"	-0.0001" to 0.0001"	Hardened	__	20	0000000	00000
7/8"	-0.0001" to 0.0001"	Hardened	__	10	0000000	00000
15/16"	-0.0001" to 0.0001"	Hardened	__	10	0000000	00000
1"	-0.0001" to 0.0001"	Hardened	__	5	0000000	00000
1 1/16"	-0.0001" to 0.0001"	Hardened	__	5	0000000	00000
1 1/8"	-0.0001" to 0.0001"	Hardened	__	5	0000000	00000
1 3/16"	-0.0001" to 0.0001"	Hardened	__	1	0000000	0000
1 1/4"	-0.0001" to 0.0001"	Hardened	__	1	0000000	0000
1 5/16"	-0.0001" to 0.0001"	Hardened	__	4	0000000	00000
1 3/8"	-0.0001" to 0.0001"	Hardened	__	1	0000000	0000
1 7/16"	-0.0001" to 0.0001"	Hardened	__	2	0000000	00000
1 1/2"	-0.0002" to 0.0002"	Hardened	__	1	0000000	0000
1 9/16"	-0.0002" to 0.0002"	Hardened	__	1	00000000	00000
1 5/8"	-0.0002" to 0.0002"	Hardened	__	1	0000000	00000
1 11/16"	-0.0002" to 0.0002"	Hardened	__	1	00000000	00000
1 3/4"	-0.0002" to 0.0002"	Hardened	__	1	0000000	00000
1 7/8"	-0.0002" to 0.0002"	Hardened	__	1	0000000	00000
2"	-0.0002" to 0.0002"	Hardened	__	1	0000000	00000
2 1/8"	-0.0002" to 0.0002"	Hardened	__	1	0000000	00000
2 1/4"	-0.0005" to 0.0005"	Hardened	__	1	0000000	00000
2 3/8"	-0.0002" to 0.0002"	Hardened	__	1	0000000	000000
2 1/2"	-0.0002" to 0.0002"	Hardened	__	1	0000000	000000
2 5/8"	-0.0002" to 0.0002"	Hardened	__	1	0000000	000000
2 3/4"	-0.0002" to 0.0002"	Hardened	__	1	0000000	000000
3"	-0.0005" to 0.0005"	Hardened	__	1	0000000	000000
3 1/4"	-0.0005" to 0.0005"	Hardened	__	1	00000000	000000
3 1/2"	-0.0005" to 0.0005"	Hardened	__	1	00000000	000000
4"	-0.0005" to 0.0005"	Hardened	__	1	00000000	000000
4 1/2"	-0.003" to 0.003"	Hardened	__	1	00000000	000000
1mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
1.5mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
2mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
2.5mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
3mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
3.5mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
4mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
4.5mm	-0.0025mm to 0.0025mm	Hardened	__	50	0000000	0000
5mm	-0.0025mm to 0.0025mm	Hardened	__	100	0000000	0000
5.5mm	-0.0025mm to 0.0025mm	Hardened	__	50	0000000	0000
6mm	-0.0025mm to 0.0025mm	Hardened	__	50	0000000	0000
6.5mm	-0.0025mm to 0.0025mm	Hardened	__	50	0000000	0000
7mm	-0.0025mm to 0.0025mm	Hardened	__	50	0000000	0000
8mm	-0.0025mm to 0.0025mm	Hardened	__	25	0000000	0000
9mm	-0.0025mm to 0.0025mm	Hardened	__	20	0000000	0000
10mm	-0.0025mm to 0.0025mm	Hardened	__	20	0000000	0000
12mm	-0.0025mm to 0.0025mm	Hardened	__	10	0000000	0000
13mm	-0.0025mm to 0.0025mm	Hardened	__	5	0000000	0000
14mm	-0.0025mm to 0.0025mm	Hardened	__	5	0000000	0000
15mm	-0.0025mm to 0.0025mm	Hardened	__	5	0000000	0000
16mm	-0.0025mm to 0.0025mm	Hardened	__	5	0000000	0000
18mm	-0.0025mm to 0.0025mm	Hardened	__	3	0000000	0000
24mm	-0.0025mm to 0.0025mm	Hardened	__	3	0000000	00000

Tight-Tolerance Hard Wear-Resistant 52100 Alloy Steel Balls

Yield Strength: 295,000psi
Hardness: Rockwell C60 (Very Hard)
Specifications Met: ASTM A295

The diameter on these balls is held to a precise tolerance. Also known as chrome steel, 52100 is an extremely hard and wear-resistant material. These balls are often used in bearings.

For technical drawings and 3-D models, click on a part number.

Mirror-Like
Dia.	Dia. Tolerance	Heat Treatment	Pkg. Qty.		Pkg.
1/16"	-0.00005" to 0.00005"	Hardened	5	00000000	00000
1/8"	-0.00005" to 0.00005"	Hardened	5	0000000	0000
9/64"	-0.00005" to 0.00005"	Hardened	5	0000000	0000
5/32"	-0.00005" to 0.00005"	Hardened	5	0000000	0000
3/16"	-0.00005" to 0.00005"	Hardened	5	0000000	0000
7/32"	-0.00005" to 0.00005"	Hardened	5	0000000	00000
1/4"	-0.00005" to 0.00005"	Hardened	2	0000000	0000
9/32"	-0.00005" to 0.00005"	Hardened	2	0000000	0000
5/16"	-0.00005" to 0.00005"	Hardened	2	0000000	0000
3/8"	-0.00005" to 0.00005"	Hardened	2	0000000	0000
7/16"	-0.00005" to 0.00005"	Hardened	1	0000000	0000
15/32"	-0.00005" to 0.00005"	Hardened	1	0000000	0000
1/2"	-0.00005" to 0.00005"	Hardened	1	0000000	0000
17/32"	-0.00005" to 0.00005"	Hardened	1	0000000	00000

Low-Carbon Steel Balls

Yield Strength: 44,000 psi
Hardness: Rockwell C60 (Very Hard)

Low-carbon steel offers excellent weldability. It's widely used for parts that don’t require high strength, such as spacers.

For technical drawings and 3-D models, click on a part number.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Mirror-Like
Dia.	Dia. Tolerance	Heat Treatment	Mechanical Finish	Pkg. Qty.		Pkg.
1/16"	-0.005" to 0.005"	Case Hardened	Tumbled	500	00000000	00000
3/32"	-0.005" to 0.005"	Case Hardened	Tumbled	500	00000000	0000
1/8"	-0.005" to 0.005"	Case Hardened	Tumbled	500	00000000	0000
5/32"	-0.005" to 0.005"	Case Hardened	Tumbled	500	00000000	0000
3/16"	-0.005" to 0.005"	Case Hardened	Tumbled	250	00000000	0000
7/32"	-0.005" to 0.005"	Case Hardened	Tumbled	250	00000000	0000
1/4"	-0.005" to 0.005"	Case Hardened	Tumbled	250	00000000	0000
9/32"	-0.005" to 0.005"	Case Hardened	Tumbled	250	00000000	00000
5/16"	-0.005" to 0.005"	Case Hardened	Tumbled	250	00000000	0000
11/32"	-0.005" to 0.005"	Case Hardened	Tumbled	100	00000000	0000
3/8"	-0.005" to 0.005"	Case Hardened	Tumbled	250	00000000	0000
7/16"	-0.005" to 0.005"	Case Hardened	Tumbled	100	00000000	0000
1/2"	-0.005" to 0.005"	Case Hardened	Tumbled	100	00000000	00000
9/16"	-0.005" to 0.005"	Case Hardened	Tumbled	100	00000000	00000
5/8"	-0.005" to 0.005"	Case Hardened	Tumbled	50	00000000	00000
3/4"	-0.005" to 0.005"	Case Hardened	Tumbled	25	00000000	00000
7/8"	-0.005" to 0.005"	Case Hardened	Tumbled	20	00000000	00000
1"	-0.005" to 0.005"	Case Hardened	Tumbled	10	00000000	0000

Hardened Shock-Resistant S2 Tool Steel

Yield Strength: 290,000 psi
Hardness: Rockwell C55 (Very Hard)
Specifications Met: ASTM A681

This S2 tool steel has been hardened for excellent strength and impact resistance. It has a tough core that resists breaking under shock loads.

For technical drawings and 3-D models, click on a part number.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Mirror-Like
Dia.	Dia. Tolerance	Mechanical Finish	Pkg. Qty.		Pkg.
3/16"	-0.001" to 0.001"	Ground and Polished	100	0000000	00000
1/4"	-0.001" to 0.001"	Ground and Polished	100	0000000	0000
5/16"	-0.001" to 0.001"	Ground and Polished	100	0000000	00000
7/16"	-0.001" to 0.001"	Ground and Polished	50	0000000	00000
1/2"	-0.001" to 0.001"	Ground and Polished	50	0000000	00000
9/16"	-0.001" to 0.001"	Ground and Polished	25	0000000	00000
11/16"	-0.001" to 0.001"	Ground and Polished	10	0000000	0000
3/4"	-0.001" to 0.001"	Ground and Polished	10	0000000	0000
13/16"	-0.001" to 0.001"	Ground and Polished	10	0000000	00000
7/8"	-0.001" to 0.001"	Ground and Polished	10	0000000	00000
15/16"	-0.001" to 0.001"	Ground and Polished	10	0000000	00000
1"	-0.001" to 0.001"	Ground and Polished	5	0000000	00000