Thread-Locking Hex Head Cap Screws

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Type Thread Type

UNC

Metric

	Material Material

Steel

Stainless Steel

	Finish Finish

Zinc Yellow-Chromate Plated

Zinc Plated

	Length Length

	Threading Threading

	Fully Threaded
	Partially Threaded

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 8	Class 8.8

	Head Width Head Width

	Head Height Head Height

	Thread Fit Thread Fit

Class 2A

Class 6h

	Tensile Strength Tensile Strength

70,000 psi

110,000 psi

150,000 psi

	Hardness Hardness

Rockwell B70

Rockwell C22

Rockwell C33

	Specifications Met Specifications Met

ASME

SAE

DIN

ISO

	Minimum Thread Length Minimum Thread Length

	Thread Pitch Thread Pitch

72 Products

About Hex Head Screws and Bolts

Fully Threaded

Partially Threaded

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are more than twice as strong as our stainless steel thread-locking screws. A nylon patch bonded to the threads adds friction to resist loosening from vibration. These screws have a zinc yellow-chromate plating that provides corrosion resistance in wet environments. Material meets SAE J429 specifications for quality. Dimensions meet ASME B18.2.1 specifications. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.

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

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Wd.	Ht.	Thread Locker Temperature Range, °F	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
Zinc Yellow-Chromate Plated Grade 8 Steel
1/4"-20
1/2"	Fully Threaded	__	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
3/4"	Fully Threaded	__	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	0000
1"	Fully Threaded	__	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
1 1/4"	Partially Threaded	3/4"	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	0000
1 1/2"	Partially Threaded	3/4"	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
1 3/4"	Partially Threaded	3/4"	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
2"	Partially Threaded	3/4"	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
2 1/2"	Partially Threaded	3/4"	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
3"	Partially Threaded	3/4"	Coarse	7/16"	11/64"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
5/16"-18
3/4"	Fully Threaded	__	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
1"	Fully Threaded	__	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	25	000000000	00000
1 1/4"	Fully Threaded	__	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
1 1/2"	Partially Threaded	7/8"	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
1 3/4"	Partially Threaded	7/8"	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
2"	Partially Threaded	7/8"	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
2 1/2"	Partially Threaded	7/8"	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
3"	Partially Threaded	7/8"	Coarse	1/2"	7/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	00000
3/8"-16
3/4"	Fully Threaded	__	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
1"	Fully Threaded	__	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
1 1/4"	Fully Threaded	__	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
1 1/2"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
1 3/4"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
2"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	00000
2 1/2"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	10	000000000	0000
3"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	0000
3 1/2"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	0000
4"	Partially Threaded	1"	Coarse	9/16"	1/4"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	0000
1/2"-13
1"	Fully Threaded	__	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	0000
1 1/4"	Fully Threaded	__	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	0000
1 1/2"	Fully Threaded	__	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	0000
1 3/4"	Fully Threaded	__	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	00000
2"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	00000
2 1/2"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	00000
3"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	5	000000000	00000
3 1/2"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
4"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
5"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
5/8"-11
1 3/4"	Fully Threaded	__	Coarse	15/16"	13/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
2"	Fully Threaded	__	Coarse	15/16"	13/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
2 1/2"	Partially Threaded	1 1/2"	Coarse	15/16"	13/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
3"	Partially Threaded	1 1/2"	Coarse	15/16"	13/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
3 1/2"	Partially Threaded	1 1/2"	Coarse	15/16"	13/32"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
3/4"-10
2"	Fully Threaded	__	Coarse	1 1/8"	1/2"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
2 1/2"	Partially Threaded	1 3/4"	Coarse	1 1/8"	1/2"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
3"	Partially Threaded	1 3/4"	Coarse	1 1/8"	1/2"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
3 1/2"	Partially Threaded	1 3/4"	Coarse	1 1/8"	1/2"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000
4"	Partially Threaded	1 3/4"	Coarse	1 1/8"	1/2"	-55° to 250°	150,000	ASME B18.2.1, SAE J429	1	000000000	0000

Medium-Strength Metric Class 8.8 Steel
Thread-Locking Hex Head Screws

These Class 8.8 steel screws are suitable for fastening most machinery and equipment. They are over 50% stronger than stainless steel thread-locking screws. A nylon patch bonded to the threads adds friction to resist loosening from vibration. These screws have a zinc plating that provides corrosion resistance in wet environments. Dimensions meet ISO 4017 (formerly DIN 933) specifications. Length is measured from under the head.

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

			Head, mm
Lg., mm	Threading	Thread Spacing	Wd.	Ht.	Thread Locker Temperature Range, °F	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Class 8.8 Steel
M5 × 0.8 mm
10	Fully Threaded	Coarse	8	3.5	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	00000
16	Fully Threaded	Coarse	8	3.5	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	00000
M6 × 1 mm
16	Fully Threaded	Coarse	10	4	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	0000
20	Fully Threaded	Coarse	10	4	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	0000
25	Fully Threaded	Coarse	10	4	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	00000
M8 × 1.25 mm
20	Fully Threaded	Coarse	13	5.3	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	0000
25	Fully Threaded	Coarse	13	5.3	-55° to 250°	110,000	ISO 4017, DIN 933	10	000000000	0000
30	Fully Threaded	Coarse	13	5.3	-55° to 250°	110,000	ISO 4017, DIN 933	5	000000000	0000
35	Fully Threaded	Coarse	13	5.3	-55° to 250°	110,000	ISO 4017, DIN 933	5	000000000	0000
M10 × 1.5 mm
20	Fully Threaded	Coarse	17	6.4	-55° to 250°	110,000	ISO 4017, DIN 933	5	000000000	0000
25	Fully Threaded	Coarse	17	6.4	-55° to 250°	110,000	ISO 4017, DIN 933	5	000000000	0000
30	Fully Threaded	Coarse	17	6.4	-55° to 250°	110,000	ISO 4017, DIN 933	5	000000000	0000
35	Fully Threaded	Coarse	17	6.4	-55° to 250°	110,000	ISO 4017, DIN 933	5	000000000	0000

Stainless Steel Thread-Locking Hex Head Screws

Fully Threaded

Partially Threaded

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. A nylon patch bonded to the threads adds friction to resist loosening from vibration. Length is measured from under the head.

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

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Wd.	Ht.	Thread Locker Temperature Range, °F	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel
1/4"-20
3/4"	Fully Threaded	__	Coarse	7/16"	5/32"	-55° to 250°	70,000	25	000000000	00000
1"	Fully Threaded	__	Coarse	7/16"	5/32"	-55° to 250°	70,000	10	000000000	0000
5/16"-18
3/4"	Fully Threaded	__	Coarse	1/2"	13/64"	-55° to 250°	70,000	10	000000000	0000
1"	Fully Threaded	__	Coarse	1/2"	13/64"	-55° to 250°	70,000	10	000000000	0000
1 1/4"	Fully Threaded	__	Coarse	1/2"	13/64"	-55° to 250°	70,000	10	000000000	0000
1 1/2"	Partially Threaded	7/8"	Coarse	1/2"	13/64"	-55° to 250°	70,000	10	000000000	0000
3/8"-16
1"	Fully Threaded	__	Coarse	9/16"	15/64"	-55° to 250°	70,000	10	000000000	0000
1 1/4"	Fully Threaded	__	Coarse	9/16"	15/64"	-55° to 250°	70,000	10	000000000	0000
1 1/2"	Partially Threaded	1"	Coarse	9/16"	15/64"	-55° to 250°	70,000	10	000000000	0000
1/2"-13
1 1/2"	Fully Threaded	__	Coarse	3/4"	5/16"	-55° to 250°	70,000	1	000000000	0000
2"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	70,000	1	000000000	0000
3"	Partially Threaded	1 1/4"	Coarse	3/4"	5/16"	-55° to 250°	70,000	1	000000000	0000

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About Hex Head Screws and Bolts

High-Strength Grade 8 SteelThread-Locking Hex Head Screws

Medium-Strength Metric Class 8.8 SteelThread-Locking Hex Head Screws

Stainless Steel Thread-Locking Hex Head Screws

High-Strength Grade 8 Steel
Thread-Locking Hex Head Screws

Medium-Strength Metric Class 8.8 Steel
Thread-Locking Hex Head Screws