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18-8 SS Hex Nut

18-8 stainless steel hex nuts are made from one of the following austenitic alloys: 303, 303Se, 304, XM7, all of which are characterized as having a chromium content of 17-19% and nickel content of 8-10%. Dimensional specifications are governed by ASME B18.2.2. There are no grade markings on 18-8 stainless hex nuts. 300 series 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 Specifications18-8 Stainless Steel

Per ASME B18.2.2-2015
Nominal Diameter		UNC	UNF	F			G		H
				Width Across Flats			Width Across Corners		Thickness
				Basic	Max	Min	Max	Min	Basic	Max	Min
#0	0.060	80	80	5/32	0.1560	0.1500	0.2210	0.2060	5/32	0.0500	0.0430
#1	0.073	64	72	5/32	0.1560	0.1500	0.2210	0.2060	5/32	0.0500	0.0430
#2	0.086	56	72	3/16	0.1880	0.1800	0.2650	0.2050	3/16	0.0660	0.0570
#3	0.099	48	64	3/16	0.1880	0.1800	0.2650	0.2050	3/16	0.0660	0.0570
#4	0.112	40	48	1/4	0.2500	0.2410	0.2890	0.2750	1/4	0.0980	0.0870
#5	0.125	40	44	5/16	0.3120	0.3020	0.3610	0.3440	5/16	0.1140	0.1020
#6	0.138	32	40	5/16	0.3120	0.3020	0.3610	0.3440	5/16	0.1140	0.1020
#8	0.164	32	36	11/32	0.3440	0.3320	0.3970	1.2540	11/32	0.1300	0.1170
#10	0.190	24	32	3/8	0.3750	0.3620	0.4330	1.4650	3/8	0.1300	0.1170
#12	0.216	24	28	7/16	0.4380	0.4380	0.5050	1.6750	7/16	0.1610	0.1480
1/4	0.2500	20	28	7/16	0.4380	0.4280	0.5050	0.4880	7/32	0.2260	0.2120
5/16	0.3125	18	24	1/2	0.5000	0.4890	0.5770	0.5570	17/64	0.2730	0.2580
3/8	0.3750	16	24	9/16	0.5630	0.5510	0.6500	0.6280	21/64	0.3370	0.3200
7/16	0.4375	14	20	11/16	0.6880	0.6750	0.7940	0.7680	3/8	0.3850	0.3650
1/2	0.5000	13	20	3/4	0.7500	0.7300	0.8660	0.8400	7/16	0.4480	0.4270
9/16	0.5625	12	18	7/8	0.8750	0.8610	1.0100	0.9820	31/64	0.4960	0.4730
5/8	0.6250	11	18	15/16	0.9380	0.9220	1.0830	1.0510	35/64	0.5590	0.5350
3/4	0.7500	10	16	1 1/8	1.1250	1.0880	1.2990	1.2400	41/64	0.6650	0.6170
7/8	0.8750	9	14	1 5/16	1.3120	1.2690	1.5160	1.4470	3/4	0.7760	0.7240
1	1.0000	8	14	1 1/2	1.5000	1.4500	1.7320	1.6530	55/64	0.8870	0.8310
1 1/8	1.1250	7	12	1 11/16	1.6880	1.6310	1.9490	1.8590	31/32	0.9990	0.9390
1 1/4	1.2500	7	12	1 7/8	1.8750	1.8120	2.1650	2.0660	1 1/16	1.0940	1.0300
1 3/8	1.3750	6	12	2 1/16	2.0620	1.9940	2.3820	2.2730	1 11/16	1.2060	1.3800
1 1/2	1.5000	6	12	2 1/4	2.2500	2.1750	2.5980	2.4800	1 9/32	1.3170	1.2450

All dimensions are in inches.

18-8 SS Hex Nut

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Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM

5/16

1/2

0.2580

NFS40310000

In Stock

$0.11486/EA

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5/16-18 18-8 STAINLESS STEEL HEX NUT

$0.11486/EA

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Quantity	Price
1	$0.11486/EA
900	$0.10766/EA
3600	$0.09573/EA
16190	$0.06379/EA

5/16

1/2

0.2580

NFS4031NF00

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$0.17857/EA

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5/16-24 18-8 STAINLESS STEEL HEX NUT

$0.17857/EA

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Quantity	Price
1	$0.17857/EA
900	$0.16738/EA
3600	$0.14883/EA
16190	$0.09918/EA

1 1/4

1 7/8

1.0300

NFS41250000

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$5.56101/EA

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1 1/4-7 18-8 STAINLESS STEEL HEX NUT

$5.56101/EA

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Quantity	Price
1	$5.56101/EA
25	$5.24946/EA
80	$4.62655/EA
500	$3.27475/EA

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1 7/8

1.0300

NFS4125NF00

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$13.7903/EA

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1 1/4-12 18-8 STAINLESS STEEL HEX NUT

$13.7903/EA

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Quantity	Price
Quantity	Price
1	$13.7903/EA
25	$13.01771/EA
80	$11.473/EA
500	$8.12078/EA

ASME B18.2.2	Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

18-8 SS Hex Nut

Technical Data

Governing Standards

Governing Standards18-8 Stainless Steel

Dimensional Specifications

Dimensional Specifications18-8 Stainless Steel

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5/16-18 18-8 STAINLESS STEEL HEX NUT

5/16-24 18-8 STAINLESS STEEL HEX NUT

1 1/4-7 18-8 STAINLESS STEEL HEX NUT

1 1/4-12 18-8 STAINLESS STEEL HEX NUT