Stud Bolt and Nut Sizes — ASME B16.5 Flange Bolting

Stud bolt, bolt and nut group for flange connections; with coating options suited to corrosive and high-temperature service.

Applications and selection notes

Studs and nuts carry the sealing load of a flanged joint. ASTM A193 B7 studs with A194 2H nuts are standard on process lines; B16 takes over at high temperature, L7 at low temperature and B8/B8M in stainless service. NACE MR0175 hardness limits apply in sour service.

Stud length depends on flange thickness, gasket type and face form; blind flanges and isolation sets need different lengths. Ordering flange, gasket and stud sets together avoids mismatches on site.

Flange bolting library: ASME B16.5, 111 rows.

Open the dimension tables

Product types

Stud bolts
Hex bolts
Anchor bolts
U-bolts

Available materials

Carbon and alloy steel
Martensitic and austenitic stainless steel
Common grades: B7 / 2H, B7M / 2HM, B8 / 8, B8M / 8M, L7 / 4

Standards

ASTM A193, A194, A320
ASME B18.2.1 / B18.2.2
ANSI, DIN and EN equivalents
Coating: hot dip galvanised, PTFE (xylan), zinc-nickel

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Dimension tables

Flange bolting library

Stud bolt count and diameter by pressure class and size for ASME B16.5 flange joints — 111 rows.

Pressure classNPSDNStud countStud dia.

Class 150	1/2"	DN 15	4	1/2"
Class 150	3/4"	DN 20	4	1/2"
Class 150	1"	DN 25	4	1/2"
Class 150	1 1/4"	DN 32	4	1/2"
Class 150	1 1/2"	DN 40	4	1/2"
Class 150	2"	DN 50	4	5/8"
Class 150	2 1/2"	DN 65	4	5/8"
Class 150	3"	DN 80	4	5/8"
Class 150	3 1/2"	DN 90	8	5/8"
Class 150	4"	DN 100	8	5/8"
Class 150	5"	DN 125	8	3/4"
Class 150	6"	DN 150	8	3/4"
Class 150	8"	DN 200	8	3/4"
Class 150	10"	DN 250	12	7/8"
Class 150	12"	DN 300	12	7/8"
Class 150	14"	DN 350	12	1"
Class 150	16"	DN 400	16	1"
Class 150	18"	DN 450	16	1 1/8"
Class 150	20"	DN 500	20	1 1/8"
Class 150	24"	DN 600	20	1 1/4"
Class 300	1/2"	DN 15	4	1/2"
Class 300	3/4"	DN 20	4	5/8"
Class 300	1"	DN 25	4	5/8"
Class 300	1 1/4"	DN 32	4	5/8"
Class 300	1 1/2"	DN 40	4	3/4"
Class 300	2"	DN 50	8	5/8"
Class 300	2 1/2"	DN 65	8	3/4"
Class 300	3"	DN 80	8	3/4"
Class 300	3 1/2"	DN 90	8	3/4"
Class 300	4"	DN 100	8	3/4"
Class 300	5"	DN 125	8	3/4"
Class 300	6"	DN 150	12	3/4"
Class 300	8"	DN 200	12	7/8"
Class 300	10"	DN 250	16	1"
Class 300	12"	DN 300	16	1 1/8"
Class 300	14"	DN 350	20	1 1/8"
Class 300	16"	DN 400	20	1 1/4"
Class 300	18"	DN 450	24	1 1/4"
Class 300	20"	DN 500	24	1 1/4"
Class 300	24"	DN 600	24	1 1/2"
Class 600	1/2"	DN 15	4	1/2"
Class 600	3/4"	DN 20	4	5/8"
Class 600	1"	DN 25	4	5/8"
Class 600	1 1/4"	DN 32	4	5/8"
Class 600	1 1/2"	DN 40	4	3/4"
Class 600	2"	DN 50	8	5/8"
Class 600	2 1/2"	DN 65	8	3/4"
Class 600	3"	DN 80	8	3/4"
Class 600	4"	DN 100	8	7/8"
Class 600	5"	DN 125	8	1"
Class 600	6"	DN 150	12	1"
Class 600	8"	DN 200	12	1 1/8"
Class 600	10"	DN 250	16	1 1/4"
Class 600	12"	DN 300	20	1 1/4"
Class 600	14"	DN 350	20	1 3/8"
Class 600	16"	DN 400	20	1 1/2"
Class 600	18"	DN 450	20	1 5/8"
Class 600	20"	DN 500	24	1 5/8"
Class 600	24"	DN 600	24	1 7/8"
Class 900	1/2"	DN 15	4	3/4"
Class 900	3/4"	DN 20	4	3/4"
Class 900	1"	DN 25	4	7/8"
Class 900	1 1/4"	DN 32	4	7/8"
Class 900	1 1/2"	DN 40	4	1"
Class 900	2"	DN 50	8	7/8"
Class 900	2 1/2"	DN 65	8	1"
Class 900	3"	DN 80	8	7/8"
Class 900	4"	DN 100	8	1 1/8"
Class 900	5"	DN 125	8	1 1/4"
Class 900	6"	DN 150	12	1 1/8"
Class 900	8"	DN 200	12	1 3/8"
Class 900	10"	DN 250	16	1 3/8"
Class 900	12"	DN 300	20	1 3/8"
Class 900	14"	DN 350	20	1 1/2"
Class 900	16"	DN 400	20	1 5/8"
Class 900	18"	DN 450	20	1 7/8"
Class 900	20"	DN 500	20	2"
Class 900	24"	DN 600	20	2 1/2"
Class 1500	1/2"	DN 15	4	3/4"
Class 1500	3/4"	DN 20	4	3/4"
Class 1500	1"	DN 25	4	7/8"
Class 1500	1 1/4"	DN 32	4	7/8"
Class 1500	1 1/2"	DN 40	4	1"
Class 1500	2"	DN 50	8	7/8"
Class 1500	2 1/2"	DN 65	8	1"
Class 1500	3"	DN 80	8	1 1/8"
Class 1500	4"	DN 100	8	1 1/4"
Class 1500	5"	DN 125	8	1 1/2"
Class 1500	6"	DN 150	12	1 3/8"
Class 1500	8"	DN 200	12	1 5/8"
Class 1500	10"	DN 250	12	1 7/8"
Class 1500	12"	DN 300	16	2"
Class 1500	14"	DN 350	16	2 1/4"
Class 1500	16"	DN 400	16	2 1/2"
Class 1500	18"	DN 450	16	2 3/4"
Class 1500	20"	DN 500	16	3"
Class 1500	24"	DN 600	16	3 1/2"
Class 2500	1/2"	DN 15	4	3/4"
Class 2500	3/4"	DN 20	4	3/4"
Class 2500	1"	DN 25	4	7/8"
Class 2500	1 1/4"	DN 32	4	1"
Class 2500	1 1/2"	DN 40	4	1 1/8"
Class 2500	2"	DN 50	8	1"
Class 2500	2 1/2"	DN 65	8	1 1/8"
Class 2500	3"	DN 80	8	1 1/4"
Class 2500	4"	DN 100	8	1 1/2"
Class 2500	5"	DN 125	8	1 3/4"
Class 2500	6"	DN 150	8	2"
Class 2500	8"	DN 200	12	2"
Class 2500	10"	DN 250	12	2 1/2"
Class 2500	12"	DN 300	12	2 3/4"

No size matches your search.

Stud length depends on gasket type and flange facing; tell us RF or RTJ and we will confirm the length list with you.

Stud Bolts / Nuts

Applications and selection notes

Product types

Available materials

Standards

Flange bolting library