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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 Item # Availability Price Quantity UOM

1/4

NFS4440

94 In Stock

$0.03956/EA

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#4-40 18-8 Stainless Steel Machine Hex Nut

$0.03956/EA

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94 In Stock

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Quantity	Price
Quantity	Price
1	$0.03956/EA
4810	$0.03706/EA
19210	$0.033/EA
76830	$0.02187/EA

5/16

NFS4540

3-5 Working Days

$0.08173/EA

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#5-40 18-8 Stainless Steel Hex Nut

$0.08173/EA

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3-5 Working Days

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Quantity	Price
Quantity	Price
1	$0.08173/EA
2500	$0.07657/EA
10000	$0.06819/EA
39970	$0.04519/EA

5/16

NFS4632

1683 In Stock

$0.03629/EA

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#6-32 18-8 Stainless Steel Machine Hex Nut

$0.03629/EA

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1683 In Stock

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Quantity	Price
Quantity	Price
1	$0.03629/EA
2360	$0.034/EA
9430	$0.03028/EA
37690	$0.02006/EA

11/32

NFS4832

4227 In Stock

$0.04279/EA

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#8-32 18-8 Stainless Steel Machine Hex Nut

$0.04279/EA

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4227 In Stock

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Quantity	Price
Quantity	Price
1	$0.04279/EA
1880	$0.04008/EA
7500	$0.0357/EA
29980	$0.02366/EA

11/32

NFS4836

3-5 Working Days

$0.23049/EA

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#8-36 18-8 Stainless Steel Machine Hex Nut

$0.23049/EA

Qty

3-5 Working Days

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Quantity	Price
Quantity	Price
1	$0.23049/EA
1880	$0.21593/EA
7500	$0.19229/EA
29980	$0.12743/EA

#10

3/8

NFS4102

3778 In Stock

$0.06016/EA

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#10-24 18-8 Stainless Steel Machine Hex Nut

$0.06016/EA

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3778 In Stock

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Quantity	Price
Quantity	Price
1	$0.06016/EA
1670	$0.05636/EA
6670	$0.05019/EA
26650	$0.03326/EA

#10

3/8

NFS4103

1569 In Stock

$0.06052/EA

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#10-32 18-8 Stainless Steel Machine Hex Nut

$0.06052/EA

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1569 In Stock

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Quantity	Price
Quantity	Price
1	$0.06052/EA
1670	$0.0567/EA
6670	$0.05049/EA
26650	$0.03346/EA

#12

7/16

NFS41220000

573 In Stock

$0.10335/EA

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#12-24 18-8 Stainless Steel Machine Hex Nut

$0.10335/EA

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573 In Stock

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Quantity	Price
Quantity	Price
1	$0.10335/EA
1880	$0.09682/EA
7500	$0.08623/EA
33720	$0.05714/EA

1/4

7/16

NFS40250000

12010 In Stock

$0.06976/EA

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1/4-20 18-8 Stainless Steel Hex Nut

$0.06976/EA

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12010 In Stock

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Quantity	Price
Quantity	Price
1	$0.06976/EA
1350	$0.06535/EA
5390	$0.0582/EA
24230	$0.03857/EA

1/4

7/16

NFS4025NF00

617 In Stock

$0.09313/EA

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1/4-28 18-8 Stainless Steel Hex Nut

$0.09313/EA

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617 In Stock

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Quantity	Price
Quantity	Price
1	$0.09313/EA
1350	$0.08725/EA
5390	$0.0777/EA
24230	$0.05149/EA

5/16

1/2

NFS40310000

2573 In Stock

$0.11474/EA

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5/16-18 18-8 Stainless Steel Hex Nut

$0.11474/EA

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2573 In Stock

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Quantity	Price
Quantity	Price
1	$0.11474/EA
900	$0.10755/EA
3600	$0.09563/EA
16190	$0.06372/EA

5/16

1/2

NFS4031NF00

858 In Stock

$0.14025/EA

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5/16-24 18-8 Stainless Steel Hex Nut

$0.14025/EA

Qty

858 In Stock

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Quantity	Price
Quantity	Price
1	$0.14025/EA
900	$0.13146/EA
3600	$0.11689/EA
16190	$0.07789/EA

3/8

9/16

NFS40370000

6651 In Stock

$0.14874/EA

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3/8-16 18-8 Stainless Steel Hex Nut

$0.14874/EA

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6651 In Stock

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Quantity	Price
Quantity	Price
1	$0.14874/EA
620	$0.13956/EA
2480	$0.12383/EA
11130	$0.08315/EA

3/8

9/16

NFS4037NF00

197 In Stock

$0.41424/EA

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3/8-24 18-8 Stainless Steel Hex Nut

$0.41424/EA

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197 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.41424/EA
620	$0.38869/EA
2480	$0.34488/EA
11130	$0.23157/EA

7/16

11/16

NFS40430000

860 In Stock

$0.30776/EA

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7/16-14 18-8 Stainless Steel Hex Nut

$0.30776/EA

Qty

860 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.30776/EA
540	$0.28938/EA
2130	$0.25579/EA
9580	$0.17522/EA

7/16

11/16

NFS4043NF00

162 In Stock

$0.28181/EA

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7/16-20 18-8 Stainless Steel Hex Nut

$0.28181/EA

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162 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28181/EA
540	$0.26498/EA
2130	$0.23422/EA
9580	$0.16045/EA

1/2

3/4

NFS40500000

13584 In Stock

$0.30751/EA

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1/2-13 18-8 Stainless Steel Hex Nut

$0.30751/EA

Qty

13584 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.30751/EA
270	$0.28935/EA
1060	$0.25567/EA
4750	$0.17615/EA

1/2

3/4

NFS4050NF00

106 In Stock

$0.33731/EA

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1/2-20 18-8 Stainless Steel Hex Nut

$0.33731/EA

Qty

106 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.33731/EA
270	$0.31739/EA
1060	$0.28045/EA
4750	$0.19321/EA

9/16

7/8

NFS40560000

575 In Stock

$0.72133/EA

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9/16-12 18-8 Stainless Steel Hex Nut

$0.72133/EA

Qty

575 In Stock

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Quantity	Price
Quantity	Price
1	$0.72133/EA
170	$0.67873/EA
680	$0.59974/EA
3060	$0.41319/EA

9/16

7/8

NFS4056NF00

3-5 Working Days

$2.22144/EA

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9/16-18 18-8 Stainless Steel Hex Nut

$2.22144/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.22144/EA
170	$2.09025/EA
680	$1.84697/EA
3060	$1.27247/EA

5/8

15/16

NFS40620000

932 In Stock

$0.61422/EA

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5/8-11 18-8 Stainless Steel Hex Nut

$0.61422/EA

Qty

932 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.61422/EA
140	$0.57853/EA
540	$0.51048/EA
2430	$0.35442/EA

5/8

15/16

NFS4062NF00

23 In Stock

$1.40655/EA

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5/8-18 18-8 Stainless Steel Hex Nut

$1.40655/EA

Qty

23 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.40655/EA
140	$1.32482/EA
540	$1.16898/EA
2430	$0.81161/EA

3/4

1 1/8

NFS40750000

853 In Stock

$0.85215/EA

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3/4-10 18-8 Stainless Steel Hex Nut

$0.85215/EA

Qty

853 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.85215/EA
90	$0.80323/EA
340	$0.70855/EA
1500	$0.49578/EA

3/4

1 1/8

NFS4075NF00

3-5 Working Days

$1.59068/EA

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3/4-16 18-8 Stainless Steel Hex Nut

$1.59068/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$1.59068/EA
90	$1.49937/EA
340	$1.32263/EA
1500	$0.92546/EA

7/8

1 5/16

NFS40870000

3-5 Working Days

$1.14044/EA

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7/8-9 18-8 Stainless Steel Hex Nut

$1.14044/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$1.14044/EA
60	$1.07593/EA
210	$0.94825/EA
940	$0.66756/EA

7/8

1 5/16

NFS4087NF00

3-5 Working Days

$2.8739/EA

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7/8-14 18-8 Stainless Steel Hex Nut

$2.8739/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.8739/EA
60	$2.71134/EA
210	$2.3896/EA
940	$1.68224/EA

1 1/2

NFS41000000

52 In Stock

$1.77888/EA

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1-8 18-8 Stainless Steel Hex Nut

$1.77888/EA

Qty

52 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.77888/EA
40	$1.67922/EA
140	$1.47996/EA
630	$1.04754/EA

1 1/2

NFS4100NF00

8 In Stock

$3.02728/EA

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1-14 18-8 Stainless Steel Hex Nut

$3.02728/EA

Qty

8 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.02728/EA
40	$2.85768/EA
140	$2.51858/EA
630	$1.78269/EA

1 1/8

11/16

NFS41120000

124 In Stock

$4.88606/EA

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1 1/8-7 18-8 Stainless Steel Hex Nut

$4.88606/EA

Qty

124 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.88606/EA
25	$4.61232/EA
100	$4.06501/EA
500	$2.87728/EA

1 1/4

1 7/8

NFS41250000

114 In Stock

$5.96318/EA

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1 1/4-7 18-8 Stainless Steel Hex Nut

$5.96318/EA

Qty

114 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.96318/EA
25	$5.6291/EA
80	$4.96114/EA
500	$3.51157/EA

1 1/4

1 7/8

NFS4125NF00

8 In Stock

$13.74043/EA

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1 1/4-12 18-8 Stainless Steel Hex Nut

$13.74043/EA

Qty

8 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$13.74043/EA
25	$12.97063/EA
80	$11.43151/EA
500	$8.09141/EA

1 3/8

2 1/16

NFS41370000

41 In Stock

$8.88133/EA

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1 3/8-6 18-8 Stainless Steel Hex Nut

$8.88133/EA

Qty

41 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$8.88133/EA
25	$8.38377/EA
60	$7.38893/EA
500	$5.23001/EA

1 1/2

2 1/4

NFS41500000

8 In Stock

$16.16544/EA

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1 1/2-6 18-8 Stainless Steel Hex Nut

$16.16544/EA

Qty

8 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$16.16544/EA
25	$15.25979/EA
50	$13.44903/EA
500	$9.51945/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

18-8 SS Hex Nut

Technical Data

Governing Standards

Governing Standards18-8 Stainless Steel

Dimensional Specifications

Dimensional Specifications18-8 Stainless Steel

Category

Thread Pitch

Thread Type

Diameter

Grade

Height of Nut

Width Across Flats

Width Across Points

#4-40 18-8 Stainless Steel Machine Hex Nut

#5-40 18-8 Stainless Steel Hex Nut

#6-32 18-8 Stainless Steel Machine Hex Nut

#8-32 18-8 Stainless Steel Machine Hex Nut

#8-36 18-8 Stainless Steel Machine Hex Nut

#10-24 18-8 Stainless Steel Machine Hex Nut

#10-32 18-8 Stainless Steel Machine Hex Nut

#12-24 18-8 Stainless Steel Machine Hex Nut

1/4-20 18-8 Stainless Steel Hex Nut

1/4-28 18-8 Stainless Steel Hex Nut

5/16-18 18-8 Stainless Steel Hex Nut

5/16-24 18-8 Stainless Steel Hex Nut

3/8-16 18-8 Stainless Steel Hex Nut

3/8-24 18-8 Stainless Steel Hex Nut

7/16-14 18-8 Stainless Steel Hex Nut

7/16-20 18-8 Stainless Steel Hex Nut

1/2-13 18-8 Stainless Steel Hex Nut

1/2-20 18-8 Stainless Steel Hex Nut

9/16-12 18-8 Stainless Steel Hex Nut

9/16-18 18-8 Stainless Steel Hex Nut

5/8-11 18-8 Stainless Steel Hex Nut

5/8-18 18-8 Stainless Steel Hex Nut

3/4-10 18-8 Stainless Steel Hex Nut

3/4-16 18-8 Stainless Steel Hex Nut

7/8-9 18-8 Stainless Steel Hex Nut

7/8-14 18-8 Stainless Steel Hex Nut

1-8 18-8 Stainless Steel Hex Nut

1-14 18-8 Stainless Steel Hex Nut

1 1/8-7 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

1 3/8-6 18-8 Stainless Steel Hex Nut

1 1/2-6 18-8 Stainless Steel Hex Nut