Sheet 19/77Products / Steel and structural / Stud bolt with nutsRev
Steel and structural · catalogue item
Stud bolt with nuts
Fully threaded rod with a heavy hex nut at each end, used to clamp flanged joints.
In short
Fully threaded rod with a heavy hex nut at each end, used to clamp flanged joints. JJ Projects sources it to the specification the buyer names. Typical reference, studs: ASTM A193 B7 (alloy steel), B8 and B8M (stainless), A320 L7 (low temperature).
Specification references
Typical references only. The governing specification is the one on your purchase order or datasheet.
| Property | Typical reference |
|---|---|
| Studs | ASTM A193 B7 (alloy steel), B8 and B8M (stainless), A320 L7 (low temperature) |
| Nuts | ASTM A194 grade 2H (with B7) or grade 8 and 8M (stainless) |
| Thread | Unified inch thread per ASME B1.1 |
| Coating | Plain or coated, as the order specifies |
Specification references describe what the order names, not a certification held by JJ Projects.
Steel and structural
Typical uses
- 01Bolting of flanged joints in piping, valves and equipment
- 02Pressure vessel and heat exchanger closures
- 03High-temperature service with B7 studs, low-temperature service with L7
- 04Corrosive service with stainless B8 and B8M studs
What to include in a request
A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.
- 01Diameter and thread, for example 3/4 in UNC; studs of 1 in and larger are commonly 8-thread series (8UN)
- 02Overall stud length, measured from end to end
- 03Stud grade and matching nut grade, for example A193 B7 with A194 2H, or B8M with grade 8M
- 04Quantity of studs and nuts, noting that each stud takes two nuts
- 05Coating or plating if required, for example PTFE-based or zinc
- 06Documents: material test report and any marking or test requirement
- 07The flange size and class, if you want help working out the stud count and length
Steel and structural
Related items
- 01Spiral-wound gasketSpiral-wound gaskets to ASME B16.20 with 304 or 316L winding and graphite or PTFE filler, for raised-face flanges, with request details needed to quote.Learn more
- 02Weld neck flangeForged weld neck flanges to ASME B16.5 and B16.47 in A105, A350 LF2 and A182 grades, and what a flange request needs to state to be quoted properly.Learn more
- 03Slip-on flangeForged slip-on flanges to ASME B16.5 in A105 and A182 grades, raised or flat face, and what to state when you request slip-on flanges for a quote.Learn more
- 04Blind flangeForged blind flanges to ASME B16.5 and B16.47 in A105 and A182 grades, Class 150 to 2500, and what to include in a blind flange request for a quote.Learn more
Guides
Guides
- 01Stud bolts and gaskets: ASTM A193 and A320How to specify flange bolting and gaskets: ASTM A193 B7, B7M, B8, A194 2H and 2HM nuts, A320 L7, coatings and spiral-wound gaskets to ASME B16.20.Learn more
- 02Flange pressure classes: ASME B16.5 and B16.47How ASME flange classes 150 to 2500 work: B16.5 vs B16.47, pressure-temperature ratings, facings RF, FF and RTJ, flange types and common materials.Learn more
- 03Material test reports (MTRs) and EN 10204What a material test report contains, how EN 10204 types 2.1, 2.2, 3.1 and 3.2 differ, what heat numbers mean, and what to check against the purchase order.Learn more
Questions
Questions
01How is the length of a stud bolt measured?
Stud length is the overall length from one end to the other, not counting the nuts. It must be long enough for full thread engagement through both flanges and the gasket, with the nuts fully threaded on.
02What is the difference between B7 and B8M studs?
ASTM A193 B7 is chromium-molybdenum alloy steel with high strength, used for high-temperature and general pressure service. B8M is austenitic stainless steel for corrosive service, with lower strength than B7. The piping specification names which one applies.
03Which nut goes with a B7 stud?
ASTM A194 grade 2H heavy hex nuts are the usual pairing with A193 B7 studs. For stainless studs the nut is a stainless grade such as 8 or 8M. Pairing is defined in the bolting specification of the project.
Send the specification. We will take it from there.
A material list, a drawing or a single line: tell us what the project needs and where it is going.