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A193 B8M Class 2 Stud Bolt

ASTM A193 Grade B8M Class 2 studs are manufactured from AISI 316 stainless steel, annealed and strain hardened to achieve increased strength characteristics per A193. Dimensional specifications are governed by ASME B18.31.2. Grade markings consists of both the grade symbol "B8MSH" and the manufacturer's identification mark on one end of each stud 3/8" diameter and larger. Manufacturer's marking may be placed on other end if insufficient space. A193 B8M Class 2 all thread studs having diameters above 1" are most common 8UN (8 threads per inch). For use in pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. A320 grade B8M CL 2 studs available for low temperature service.

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Governing Standards
Mechanical Properties
Chemical Properties
Stud Flange Chart

Stud Flange Chart

Stud Flange ChartsASME B16.5

FLANGE		NOMINAL PIPE DIAMETER
CLASS	BOLTING	1/2	3/4	1	1-1/4	1-1/2	2	2-1/2	3	3-1/2	4
150#	Number	4	4	4	4	4	4	4	4	8	8
	Diameter	1/2	1/2	1/2	1/2	1/2	5/8	5/8	5/8	5/8	5/8
	Stud Bolt Length	2-1/4	2-1/2	2-1/2	2-3/4	2-3/4	3-1/4	3-1/2	3-1/2	3-1/2	3-1/2
	Mach Bolt Length	2	2	2-1/4	2-1/4	2-1/2	2-3/4	3	3	3	3
300#	Number	4	4	4	4	4	8	8	8	8	8
	Diameter	1/2	5/8	5/8	5/8	3/4	5/8	3/4	3/4	3/4	3/4
	Stud Bolt Length	2-1/2	3	3	3-1/4	3-1/2	3-1/2	4	4-1/4	4-1/4	4-1/2
	Mach Bolt Length	2-1/4	2-1/2	2-1/2	2-3/4	3	3	3-1/4	3-1/2	3-3/4	3-3/4
600#	Number	4	4	4	4	4	8	8	8	8	8
	Diameter	1/2	5/8	5/8	5/8	3/4	5/8	3/4	3/4	7/8	7/8
	Stud Bolt Length	3	3-1/2	3-1/2	3-3/4	4-1/4	4-1/4	4-3/4	5	5-1/2	5-3/4
900#	Number	4	4	4	4	4	8	8	8	-	8
	Diameter	3/4	3/4	7/8	7/8	1	7/8	1	7/8	-	1-1/8
	Stud Bolt Length	4-1/4	4-1/2	5	5	5-1/2	5-3/4	6-1/4	5-3/4	-	6-3/4
1500#	Number	4	4	4	4	4	8	8	8	-	8
	Diameter	3/4	3/4	7/8	7/8	1	7/8	1	1-1/8	-	1-1/4
	Stud Bolt Length	4-1/4	4-1/2	5	5	5-1/2	5-3/4	6-1/4	7	-	7-3/4
2500#	Number	4	4	4	4	4	8	8	8	-	8
	Diameter	3/4	3/4	7/8	1	1-1/8	1	1-1/8	1-1/4	-	1-1/2
	Stud Bolt Length	4-3/4	5	5-1/2	6	6-3/4	7	7-3/4	8-3/4	-	10
FLANGE		NOMINAL PIPE DIAMETER
CLASS	BOLTING	5	6	8	10	12	14	16	18	20	24
150#	Number	8	8	8	12	12	12	16	16	20	20
	Diameter	3/4	3/4	3/4	7/8	7/8	1	1	1-1/8	1-1/8	1-1/4
	Stud Bolt Length	3-3/4	4	4-1/4	4-1/2	4-3/4	5-1/4	5-1/4	5-3/4	6-1/4	6-3/4
	Mach Bolt Length	3-1/4	3-1/4	3-1/2	4	4	4-1/2	4-1/2	5	5-1/2	6
300#	Number	8	12	12	16	16	20	20	24	24	24
	Diameter	3/4	3/4	7/8	1	1-1/8	1-1/8	1-1/4	1-1/4	1-1/4	1-1/2
	Stud Bolt Length	4-3/4	4-3/4	5-1/2	6-1/4	6-3/4	7	7-1/2	7-3/4	8	9
	Mach Bolt Length	4-1/4	4-1/4	4-3/4	5-1/2	5-3/4	6-1/4	6-1/2	6-3/4	7-1/4	8
600#	Number	8	12	12	16	20	20	20	20	24	24
	Diameter	1	1	1-1/8	1-1/4	1-1/4	1-3/8	1-1/2	1-5/8	1-5/8	1-7/8
	Stud Bolt Length	6-1/2	6-3/4	7-1/2	8-1/2	8-3/4	9-1/4	10	10-3/4	11-1/4	13
900#	Number	8	12	12	16	20	20	20	20	20	20
	Diameter	1-1/4	1-1/8	1-3/8	1-3/8	1-3/8	1-1/2	1-5/8	1-7/8	2	2-1/2
	Stud Bolt Length	7-1/2	7-1/2	8-3/4	9-1/4	10	10-3/4	11-1/4	12-3/4	13-3/4	17-1/4
1500#	Number	8	12	12	12	16	16	16	16	16	16
	Diameter	1-1/2	1-3/8	1-5/8	1-7/8	2	2-1/4	2-1/2	2-3/4	3	3-1/2
	Stud Bolt Length	9-3/4	10-1/4	11-1/2	13-1/4	14-3/4	16	17-1/2	19-1/2	21-1/4	24-1/4
2500#	Number	8	8	12	12	12	-	-	-	-	-
	Diameter	1-3/4	2	2	2-1/2	2-3/4	-	-	-	-	-
	Stud Bolt Length	11-3/4	13-1/2	15	19-1/4	21-1/4	-	-	-	-	-

All dimensions are in inches.

A193 B8M Class 2 Stud Bolt

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Diameter Length 1st Thrd To 1st Thrd Item # Availability Price Quantity UOM

5/8

2 1/2

2 1/4

SB8M0620250C2-I

1-3 Working Days

$6.33376/EA

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5/8-11 X 2 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$6.33376/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$6.33376/EA
60	$6.03608/EA
230	$5.15188/EA
1020	$4.357/EA

5/8

2 3/4

2 1/2

SB8M0620275C2-I

1-3 Working Days

$6.81576/EA

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5/8-11 X 2 3/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$6.81576/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$6.81576/EA
60	$6.49542/EA
210	$5.54394/EA
930	$4.68856/EA

5/8

2 3/4

SB8M0620300C2-I

1-3 Working Days

$7.27519/EA

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5/8-11 X 3 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$7.27519/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$7.27519/EA
50	$6.93326/EA
190	$5.91764/EA
850	$5.0046/EA

5/8

3 1/4

SB8M0620325C2-I

1-3 Working Days

$7.8201/EA

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5/8-11 X 3 1/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$7.8201/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$7.8201/EA
50	$7.45256/EA
180	$6.36087/EA
780	$5.37945/EA

5/8

3 1/2

3 1/4

SB8M0620350C2-I

1-3 Working Days

$8.30031/EA

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5/8-11 X 3 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$8.30031/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$8.30031/EA
50	$7.91019/EA
170	$6.75147/EA
730	$5.70978/EA

5/8

3 3/4

3 1/2

SB8M0620375C2-I

1-3 Working Days

$8.66256/EA

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5/8-11 X 3 3/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$8.66256/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$8.66256/EA
40	$8.25542/EA
160	$7.04613/EA
680	$5.95898/EA

5/8

3 3/4

SB8M0620400C2-I

1-3 Working Days

$9.28358/EA

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5/8-11 X 4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$9.28358/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$9.28358/EA
40	$8.84725/EA
150	$7.55126/EA
640	$6.38617/EA

5/8

4 1/4

SB8M0620425C2-I

1-3 Working Days

$9.76032/EA

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5/8-11 X 4 1/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$9.76032/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$9.76032/EA
40	$9.30158/EA
140	$7.93904/EA
600	$6.71412/EA

5/8

4 1/2

4 1/4

SB8M0620450C2-I

1-3 Working Days

$10.29857/EA

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5/8-11 X 4 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$10.29857/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$10.29857/EA
40	$9.81453/EA
130	$8.37685/EA
570	$7.08438/EA

5/8

4 3/4

4 1/2

SB8M0620475C2-I

1-3 Working Days

$10.59461/EA

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5/8-11 X 4 3/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$10.59461/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$10.59461/EA
30	$10.09666/EA
120	$8.61765/EA
540	$7.28803/EA

5/8

4 3/4

SB8M0620500C2-I

1-3 Working Days

$11.25012/EA

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5/8-11 X 5 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$11.25012/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$11.25012/EA
30	$10.72136/EA
120	$9.15085/EA
510	$7.73896/EA

5/8

5 1/4

SB8M0620525C2-I

1-3 Working Days

$11.6143/EA

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5/8-11 X 5 1/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$11.6143/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$11.6143/EA
30	$11.06842/EA
110	$9.44707/EA
500	$7.98947/EA

5/8

5 1/2

5 1/4

SB8M0620550C2-I

1-3 Working Days

$12.00648/EA

See Quantity Discounts

5/8-11 X 5 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$12.00648/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$12.00648/EA
30	$11.44218/EA
110	$9.76607/EA
500	$8.25926/EA

5/8

5 3/4

5 1/2

SB8M0620575C2-I

1-3 Working Days

$12.88891/EA

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5/8-11 X 5 3/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$12.88891/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$12.88891/EA
25	$12.28313/EA
100	$10.48384/EA
500	$8.86628/EA

5/8

5 3/4

SB8M0620600C2-I

1-3 Working Days

$13.38767/EA

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5/8-11 X 6 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$13.38767/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$13.38767/EA
25	$12.75845/EA
100	$10.88953/EA
500	$9.20938/EA

5/8

6 1/4

SB8M0620625C2-I

1-3 Working Days

$13.93177/EA

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5/8-11 X 6 1/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$13.93177/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$13.93177/EA
25	$13.27698/EA
100	$11.3321/EA
500	$9.58366/EA

5/8

6 1/2

6 1/4

SB8M0620650C2-I

1-3 Working Days

$13.93177/EA

See Quantity Discounts

5/8-11 X 6 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$13.93177/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$13.93177/EA
25	$13.27698/EA
90	$11.3321/EA
500	$9.58366/EA

5/8

6 3/4

6 1/2

SB8M0620675C2-I

1-3 Working Days

$14.52769/EA

See Quantity Discounts

5/8-11 X 6 3/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$14.52769/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$14.52769/EA
25	$13.84489/EA
90	$11.81683/EA
500	$9.9936/EA

5/8

6 3/4

SB8M0620700C2-I

1-3 Working Days

$15.18321/EA

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5/8-11 X 7 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$15.18321/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$15.18321/EA
25	$14.4696/EA
90	$12.35002/EA
500	$10.44453/EA

5/8

7 1/4

SB8M0620725C2-I

1-3 Working Days

$15.90772/EA

See Quantity Discounts

5/8-11 X 7 1/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$15.90772/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$15.90772/EA
25	$15.16006/EA
80	$12.93934/EA
500	$10.94292/EA

5/8

7 1/2

7 1/4

SB8M0620750C2-I

1-3 Working Days

$15.90772/EA

See Quantity Discounts

5/8-11 X 7 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$15.90772/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$15.90772/EA
25	$15.16006/EA
80	$12.93934/EA
500	$10.94292/EA

5/8

7 3/4

7 1/2

SB8M0620775C2-I

1-3 Working Days

$16.71274/EA

See Quantity Discounts

5/8-11 X 7 3/4 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$16.71274/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$16.71274/EA
25	$15.92724/EA
80	$13.59414/EA
500	$11.49669/EA

5/8

7 3/4

SB8M0620800C2-I

1-3 Working Days

$17.61247/EA

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5/8-11 X 8 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$17.61247/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$17.61247/EA
25	$16.78468/EA
80	$14.32598/EA
500	$12.11562/EA

5/8

8 1/2

8 1/4

SB8M0620850C2-I

1-3 Working Days

$18.62466/EA

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5/8-11 X 8 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$18.62466/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$18.62466/EA
25	$17.7493/EA
70	$15.1493/EA
500	$12.8119/EA

5/8

8 3/4

SB8M0620900C2-I

1-3 Working Days

$19.77181/EA

See Quantity Discounts

5/8-11 X 9 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$19.77181/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$19.77181/EA
25	$18.84253/EA
70	$16.08239/EA
500	$13.60103/EA

5/8

9 3/4

SB8M0621000C2-I

1-3 Working Days

$21.08284/EA

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5/8-11 X 10 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$21.08284/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$21.08284/EA
25	$20.09194/EA
60	$17.14878/EA
500	$14.50288/EA

5/8

10 1/2

10 1/4

SB8M0621050C2-I

1-3 Working Days

$22.59556/EA

See Quantity Discounts

5/8-11 X 10 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$22.59556/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$22.59556/EA
25	$21.53357/EA
60	$18.37923/EA
500	$15.54349/EA

5/8

10 3/4

SB8M0621100C2-I

1-3 Working Days

$22.59556/EA

See Quantity Discounts

5/8-11 X 11 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$22.59556/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$22.59556/EA
25	$21.53357/EA
60	$18.37923/EA
500	$15.54349/EA

5/8

11 1/2

11 1/4

SB8M0621150C2-I

1-3 Working Days

$24.36041/EA

See Quantity Discounts

5/8-11 X 11 1/2 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$24.36041/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$24.36041/EA
25	$23.21547/EA
50	$19.81476/EA
500	$16.75753/EA

5/8

11 3/4

SB8M0621200C2-I

1-3 Working Days

$24.36041/EA

See Quantity Discounts

5/8-11 X 12 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$24.36041/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$24.36041/EA
25	$23.21547/EA
50	$19.81476/EA
500	$16.75753/EA

5/8

12 3/4

SB8M0621300C2-I

1-3 Working Days

$26.44614/EA

See Quantity Discounts

5/8-11 X 13 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$26.44614/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$26.44614/EA
25	$25.20317/EA
50	$21.51129/EA
500	$18.1923/EA

5/8

13 3/4

SB8M0621400C2-I

1-3 Working Days

$28.94901/EA

See Quantity Discounts

5/8-11 X 14 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$28.94901/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$28.94901/EA
25	$27.58841/EA
50	$23.54713/EA
500	$19.91402/EA

5/8

14 3/4

SB8M0621500C2-I

1-3 Working Days

$32.00808/EA

See Quantity Discounts

5/8-11 X 15 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$32.00808/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$32.00808/EA
40	$30.5037/EA
80	$26.03537/EA
170	$22.01836/EA

5/8

15 3/4

SB8M0621600C2-I

1-3 Working Days

$32.00808/EA

See Quantity Discounts

5/8-11 X 16 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$32.00808/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$32.00808/EA
40	$30.5037/EA
80	$26.03537/EA
160	$22.01836/EA

5/8

16 3/4

SB8M0621700C2-I

1-3 Working Days

$35.83191/EA

See Quantity Discounts

5/8-11 X 17 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$35.83191/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$35.83191/EA
40	$34.14781/EA
70	$29.14568/EA
150	$24.64877/EA

5/8

17 3/4

SB8M0621800C2-I

1-3 Working Days

$35.83191/EA

See Quantity Discounts

5/8-11 X 18 A193 B8M CLASS 2 STAINLESS STEEL STUD BOLT

$35.83191/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$35.83191/EA
40	$34.14781/EA
70	$29.14568/EA
150	$24.64877/EA

ASTM A193	Covers alloy and stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
ASME B18.31.2	Covers the complete dimensional and general data for continuous thread, flange studs (stud bolts), and double-end inch-dimensioned studs.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

AISI 316 Stainless Steel, Carbide Solution Treated, Strain Hardened				Per ASTM A193/A193M-16
Material	Tensile Strength	Yield Strength, 0.2% offset	Elongation in 4D	Reduction of Area	Hardness
Material	Min ksi	Min ksi	Min %	Min %	Max
316 Stainless Steel	110	95	15	45	321 HBW or 35 HRC

Per ASTM A193/A193M-16
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Molybdenum
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
B8M	316 Stainless Steel	0.08 max	2.00 max	0.045 max	0.030 max	1.00 max	16.0-18.0	10.0-14.0	2.00-3.00