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304 SS Hex Cap Screw

304 Stainless Steel hex head cap screws are common fasteners manufactured from austenitic 304 stainless steel. They have a chromium content of 17-19% and nickel content of 8-10%. Dimensional specifications are governed by ASME B18.2.1. Stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment. Stainless steel has a higher corrosion resistance than carbon steel.

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Governing Standards
Dimensional Specifications

Dimensional Specifications

Dimensional Specifications304 Stainless Steel

Per ASME B18.2.1-2012
Nominal Diameter		UNC	UNF	E		F			G		H			J	LT		Y
				Body Diameter		Width Across Flats			Width Across Corners		Head Height			Wrench Height	Thread Length		Transition Length
				Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Min	Lengths up to 6"	Lengths > 6"	Max
1/4	0.2500	20	28	0.2500	0.2405	7/16	0.4380	0.4280	0.5050	0.4880	5/32	0.1630	0.1500	0.1060	0.7500	1.0000	0.2500
5/16	0.3125	18	24	0.3125	0.3065	1/2	0.5000	0.4890	0.5770	0.5570	13/64	0.2110	0.1950	0.1400	0.8750	1.1250	0.2750
3/8	0.3750	16	24	0.3750	0.3690	9/16	0.5620	0.5510	0.6500	0.6280	15/64	0.2430	0.2260	0.1600	1.0000	1.2500	0.3120
7/16	0.4375	14	20	0.4375	0.4305	5/8	0.6250	0.6120	0.7220	0.6980	9/32	0.2910	0.2720	0.1950	1.1250	1.3750	0.3570
1/2	0.5000	13	20	0.5000	0.4930	3/4	0.7500	0.7360	0.8660	0.8400	5/16	0.3230	0.3020	0.2150	1.2500	1.5000	0.3850
9/16	0.5625	12	18	0.5625	0.5545	13/16	0.8120	0.7980	0.9380	0.9100	23/64	0.3710	0.3480	0.2500	1.3750	1.6250	0.4170
5/8	0.6250	11	18	0.6250	0.6170	15/16	0.9380	0.9220	1.0830	1.0510	25/64	0.4030	0.3780	0.2690	1.5000	1.7500	0.4550
3/4	0.7500	10	16	0.7500	0.7410	1 1/8	1.1250	1.1000	1.2990	1.2540	15/32	0.4830	0.4550	0.3240	1.7500	2.0000	0.5000
7/8	0.8750	9	14	0.8750	0.8660	1 5/16	1.3120	1.2850	1.5160	1.4650	35/64	0.5630	0.5310	0.3780	2.0000	2.2500	0.5560
1	1.0000	8	14	1.0000	0.9900	1 1/2	1.5000	1.4690	1.7320	1.6750	39/64	0.6270	0.5910	0.4160	2.2500	2.5000	0.6250
1 1/8	1.1250	7	12	1.1250	1.1140	1 11/16	1.6880	1.6310	1.9490	1.8590	11/16	0.7180	0.6580	0.4610	2.5000	2.7500	0.7140
1 1/4	1.2500	7	12	1.2500	1.2390	1 7/8	1.8750	1.8120	2.1650	2.0660	25/32	0.8130	0.7490	0.5300	2.7500	3.0000	0.7140
1 3/8	1.3750	6	12	1.3750	1.3630	2 1/16	2.0620	1.9940	2.3820	2.2730	27/32	0.8780	0.8100	0.5690	3.0000	3.2500	0.8330
1 1/2	1.5000	6	12	1.5000	1.4880	2 1/4	2.2500	2.1750	2.5980	2.4800	15/16	0.9740	0.9020	0.6400	3.2500	3.5000	0.8330

All dimensions are in inches.
Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″

304 SS Hex Cap Screw

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Diameter Thread Pitch Length Threading Item # Availability Price Quantity UOM

1/4

3 1/4

Partial

HHS40250325

In Stock

$0.44438/EA

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1/4-20 X 3 1/4 304 SS HEX CAP SCREW

$0.44438/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.44438/EA
210	$0.41631/EA
810	$0.37075/EA
3620	$0.24568/EA

3/8

3 1/2

Partial

HHS40370350

In Stock

$1.12287/EA

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3/8-16 X 3 1/2 304 SS HEX CAP SCREW

$1.12287/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$1.12287/EA
90	$1.05361/EA
330	$0.93488/EA
1490	$0.62772/EA

3/8

3 1/2

Partial

HHS40370350NF

In Stock

$1.51692/EA

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3/8-24 X 3 1/2 18-8 SS HEX CAP SCREW

$1.51692/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.51692/EA
90	$1.42336/EA
330	$1.26295/EA
1490	$0.84801/EA

1/2

3 3/4

Partial

HHS40500375

In Stock

$2.73625/EA

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1/2-13 X 3 3/4 304 SS HEX CAP SCREW

$2.73625/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.73625/EA
50	$2.57465/EA
170	$2.27499/EA
740	$1.56736/EA

5/8

Partial

HHS40620400

In Stock

$2.31943/EA

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5/8-11 X 4 304 SS HEX CAP SCREW

$2.31943/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.31943/EA
25	$2.18467/EA
100	$1.92768/EA
500	$1.33836/EA

3/4

4 1/4

Partial

HHS40750425

In Stock

$4.43814/EA

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3/4-10 X 4 1/4 304 SS HEX CAP SCREW

$4.43814/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.43814/EA
25	$4.18338/EA
70	$3.69026/EA
500	$2.58211/EA

7/8

4 1/2

Partial

HHS40870450

In Stock

$8.42962/EA

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7/8-9 X 4 1/2 304 SS HEX CAP SCREW

$8.42962/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$8.42962/EA
25	$7.95281/EA
50	$7.00908/EA
500	$4.93429/EA

ASME B18.2.1	Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

304 SS Hex Cap Screw

Technical Data

Governing Standards

Governing Standards304 Stainless Steel

Dimensional Specifications

Dimensional Specifications304 Stainless Steel

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Body Diameter

Shoulder Length

Length

Thread Pitch

Thread Length

Thread Type

Diameter

Grade

Width Across Flats

Height of Head

Width Across Points

1/4-20 X 3 1/4 304 SS HEX CAP SCREW

3/8-16 X 3 1/2 304 SS HEX CAP SCREW

3/8-24 X 3 1/2 18-8 SS HEX CAP SCREW

1/2-13 X 3 3/4 304 SS HEX CAP SCREW

5/8-11 X 4 304 SS HEX CAP SCREW

3/4-10 X 4 1/4 304 SS HEX CAP SCREW

7/8-9 X 4 1/2 304 SS HEX CAP SCREW