Left-Hand Threaded 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

	Thread Pitch Thread Pitch

	Length Length

	Material Material

Steel

Stainless Steel

	Threading Threading

	Fully Threaded
	Partially Threaded

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 5	Grade 8

Class 8.8

	Head Width Head Width

	Head Height Head Height

	Thread Fit Thread Fit

Class 2A

Class 6g

	Tensile Strength Tensile Strength

70,000 psi

110,000 psi

150,000 psi

	Hardness Hardness

Rockwell B70

Rockwell C21

Rockwell C33

	Specifications Met Specifications Met

SAE

ASME

ISO

	Minimum Thread Length Minimum Thread Length

91 Products

About Hex Head Screws and Bolts

These Class 8.8 steel screws are suitable for fastening machinery and equipment. Tighten them by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Material meets ISO 898-1 specifications for quality. Dimensions meet ASME B18.2.3.1M specifications. Length is measured from under the head.

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

		Head
Lg., mm	Threading	Wd., mm	Ht., mm	Thread Spacing	Tensile Strength, psi	Specifications Met		Each
Class 8.8 Steel
M6 × 1 mm
12	Fully Threaded	10	4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	000000
16	Fully Threaded	10	4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
20	Fully Threaded	10	4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
25	Fully Threaded	10	4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
30	Fully Threaded	10	4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
M8 × 1.25 mm
16	Fully Threaded	13	5.3	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
20	Fully Threaded	13	5.3	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
25	Fully Threaded	13	5.3	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
30	Fully Threaded	13	5.3	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
35	Fully Threaded	13	5.3	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
40	Fully Threaded	13	5.3	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
M10 × 1.5 mm
20	Fully Threaded	17	6.4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
25	Fully Threaded	17	6.4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
30	Fully Threaded	17	6.4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
35	Fully Threaded	17	6.4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
40	Fully Threaded	17	6.4	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
M12 × 1.75 mm
25	Fully Threaded	19	7.5	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
30	Fully Threaded	19	7.5	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
35	Fully Threaded	19	7.5	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000
40	Fully Threaded	19	7.5	Coarse	110,000	ASME B18.2.3.1M, ISO 898-1	000000000	00000

Left-Hand Threaded Medium-Strength
Grade 5 Steel Hex Head Screws

Fully Threaded

Partially Threaded

Made from Grade 5 steel, these screws are suitable for fastening machinery and equipment. Tighten them by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Material meets SAE J429 specifications for quality. Dimensions meet ASME B18.2.1 specifications. Grade 5 steel hex head screws are marked with three 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.	Tensile Strength, psi	Specifications Met		Each
Grade 5 Steel
3/8"-16
1 1/2"	Fully Threaded	__	Coarse	9/16"	1/4"	110,000	ASME B18.2.1, SAE J429	000000000	00000
1 3/4"	Fully Threaded	__	Coarse	9/16"	1/4"	110,000	ASME B18.2.1, SAE J429	000000000	0000
2"	Fully Threaded	__	Coarse	9/16"	1/4"	110,000	ASME B18.2.1, SAE J429	000000000	0000
2 1/2"	Fully Threaded	__	Coarse	9/16"	1/4"	110,000	ASME B18.2.1, SAE J429	000000000	0000
3"	Fully Threaded	__	Coarse	9/16"	1/4"	110,000	ASME B18.2.1, SAE J429	000000000	0000
1/2"-13
1 1/2"	Fully Threaded	__	Coarse	3/4"	11/32"	110,000	ASME B18.2.1, SAE J429	000000000	0000
1 3/4"	Fully Threaded	__	Coarse	3/4"	11/32"	110,000	ASME B18.2.1, SAE J429	000000000	0000
2"	Fully Threaded	__	Coarse	3/4"	11/32"	110,000	ASME B18.2.1, SAE J429	000000000	0000
2 1/2"	Fully Threaded	__	Coarse	3/4"	11/32"	110,000	ASME B18.2.1, SAE J429	000000000	0000
3"	Fully Threaded	__	Coarse	3/4"	11/32"	110,000	ASME B18.2.1, SAE J429	000000000	0000
4"	Fully Threaded	__	Coarse	3/4"	11/32"	110,000	ASME B18.2.1, SAE J429	000000000	0000
5/8"-11
1 1/2"	Fully Threaded	__	Coarse	15/16"	27/64"	110,000	ASME B18.2.1, SAE J429	000000000	0000
2"	Fully Threaded	__	Coarse	15/16"	27/64"	110,000	ASME B18.2.1, SAE J429	000000000	0000
3"	Fully Threaded	__	Coarse	15/16"	27/64"	110,000	ASME B18.2.1, SAE J429	000000000	0000
4"	Partially Threaded	1 1/2"	Coarse	15/16"	27/64"	110,000	ASME B18.2.1, SAE J429	000000000	00000
3/4"-10
1 1/2"	Fully Threaded	__	Coarse	1 1/8"	1/2"	110,000	ASME B18.2.1, SAE J429	000000000	00000
4"	Partially Threaded	1 3/4"	Coarse	1 1/8"	1/2"	110,000	ASME B18.2.1, SAE J429	000000000	00000

Left-Hand Threaded High-Strength Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from Grade 8 steel, they are at least 25% stronger than medium-strength steel screws. The zinc yellow-chromate plating resists corrosion in wet environments. Material meets SAE J429 specifications for quality. 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	Thread Spacing	Wd.	Ht.	Tensile Strength, psi	Specifications Met		Each
Zinc Yellow-Chromate Plated Grade 8 Steel
1/4"-20
3/4"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	000000
1"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	00000
1 1/4"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	00000
1 1/2"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	00000
2"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	00000
2 1/2"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	00000
3"	Fully Threaded	Coarse	7/16"	11/64"	150,000	SAE J429	000000000	00000
5/16"-18
3/4"	Fully Threaded	Coarse	1/2"	7/32"	150,000	SAE J429	000000000	00000
1"	Fully Threaded	Coarse	1/2"	7/32"	150,000	SAE J429	000000000	00000
1 1/2"	Fully Threaded	Coarse	1/2"	7/32"	150,000	SAE J429	000000000	00000
2"	Fully Threaded	Coarse	1/2"	7/32"	150,000	SAE J429	000000000	00000
2 1/2"	Fully Threaded	Coarse	1/2"	7/32"	150,000	SAE J429	000000000	00000
3/8"-16
1"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
1 1/4"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
1 1/2"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
1 3/4"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
2"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
2 1/2"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
3"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
4"	Fully Threaded	Coarse	9/16"	1/4"	150,000	SAE J429	000000000	00000
1/2"-13
1 1/2"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
1 3/4"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
2"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
2 1/4"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
2 1/2"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
3"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
3 1/2"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
4"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
4 1/2"	Fully Threaded	Coarse	3/4"	11/32"	150,000	SAE J429	000000000	00000
5/8"-11
1 1/2"	Fully Threaded	Coarse	15/16"	27/64"	150,000	SAE J429	000000000	00000
1 3/4"	Fully Threaded	Coarse	15/16"	27/64"	150,000	SAE J429	000000000	00000
2"	Fully Threaded	Coarse	15/16"	27/64"	150,000	SAE J429	000000000	00000
2 1/2"	Fully Threaded	Coarse	15/16"	27/64"	150,000	SAE J429	000000000	00000
3"	Fully Threaded	Coarse	15/16"	27/64"	150,000	SAE J429	000000000	00000
4"	Fully Threaded	Coarse	15/16"	27/64"	150,000	SAE J429	000000000	00000
3/4"-10
1 1/2"	Fully Threaded	Coarse	1 1/8"	1/2"	150,000	SAE J429	000000000	00000
2"	Fully Threaded	Coarse	1 1/8"	1/2"	150,000	SAE J429	000000000	00000
2 1/2"	Fully Threaded	Coarse	1 1/8"	1/2"	150,000	SAE J429	000000000	00000
3"	Fully Threaded	Coarse	1 1/8"	1/2"	150,000	SAE J429	000000000	00000
4"	Fully Threaded	Coarse	1 1/8"	1/2"	150,000	SAE J429	000000000	00000

Left-Hand Threaded 18-8
Stainless Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. Length is measured from under the head.

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

			Head
Lg.	Threading	Thread Spacing	Wd.	Ht.	Tensile Strength, psi		Each
1/4"-20
1/2"	Fully Threaded	Coarse	7/16"	11/64"	70,000	000000000	000000
3/4"	Fully Threaded	Coarse	7/16"	11/64"	70,000	000000000	00000
1"	Fully Threaded	Coarse	7/16"	11/64"	70,000	000000000	00000
1 1/4"	Fully Threaded	Coarse	7/16"	11/64"	70,000	000000000	00000
1 1/2"	Fully Threaded	Coarse	7/16"	11/64"	70,000	000000000	00000
3/8"-16
3/4"	Fully Threaded	Coarse	9/16"	1/4"	70,000	000000000	00000
1"	Fully Threaded	Coarse	9/16"	1/4"	70,000	000000000	00000
1 1/2"	Fully Threaded	Coarse	9/16"	1/4"	70,000	000000000	00000
2"	Fully Threaded	Coarse	9/16"	1/4"	70,000	000000000	00000
1/2"-13
1"	Fully Threaded	Coarse	3/4"	11/32"	70,000	000000000	00000
1 1/2"	Fully Threaded	Coarse	3/4"	11/32"	70,000	000000000	00000
2"	Fully Threaded	Coarse	3/4"	11/32"	70,000	000000000	00000
2 1/2"	Fully Threaded	Coarse	3/4"	11/32"	70,000	000000000	00000
3"	Fully Threaded	Coarse	3/4"	11/32"	70,000	000000000	00000

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About Hex Head Screws and Bolts

Left-Hand Threaded Medium-StrengthMetric Class 8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-StrengthGrade 5 Steel Hex Head Screws

Left-Hand Threaded High-Strength Steel Hex Head Screws

Left-Hand Threaded 18-8Stainless Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Grade 5 Steel Hex Head Screws

Left-Hand Threaded 18-8
Stainless Steel Hex Head Screws