Stud bolts for flange joints
Fully threaded stud bolts and double-end studs, ½ inch to 4 inch and M12 to M100, in alloy, stainless and exotic grades.
Bolt set finder
Choose flange size, class and number of joints.
Bolt set finder
Studs and heavy hex nuts for any number of ASME B16.5 flange joints.
Stud length depends on facing and gasket thickness, so add those in your enquiry.
What d and L mean
- dNominal diameter, inch or metric
- LOverall length, set by flange, facing and gasket
- FWidth across flats = 1.5d + 1/8 in
- HThickness = d − 1/64 in
Have a BOQ or drawing? Get a quotation from the manufacturer.
Send sizes, grades and quantities. Our estimation team usually replies within one working day.
Bolting per ASME B16.5 flange
| Flange size | 150# qty | 150# d | 300# qty | 300# d | 600# qty | 600# d | |
|---|---|---|---|---|---|---|---|
| 1/2" (15 NB) | 4 | 1/2" | 4 | 1/2" | 4 | 1/2" | Quote |
| 1" (25 NB) | 4 | 1/2" | 4 | 5/8" | 4 | 5/8" | Quote |
| 2" (50 NB) | 4 | 5/8" | 8 | 5/8" | 8 | 5/8" | Quote |
| 3" (80 NB) | 4 | 5/8" | 8 | 3/4" | 8 | 3/4" | Quote |
| 4" (100 NB) | 8 | 5/8" | 8 | 3/4" | 8 | 7/8" | Quote |
| 6" (150 NB) | 8 | 3/4" | 12 | 3/4" | 12 | 1" | Quote |
| 8" (200 NB) | 8 | 3/4" | 12 | 7/8" | 12 | 1-1/8" | Quote |
| 10" (250 NB) | 12 | 7/8" | 16 | 1" | 16 | 1-1/4" | Quote |
| 12" (300 NB) | 12 | 7/8" | 16 | 1-1/8" | 20 | 1-1/4" | Quote |
| 16" (400 NB) | 16 | 1" | 20 | 1-1/4" | 20 | 1-1/2" | Quote |
| 20" (500 NB) | 20 | 1-1/8" | 24 | 1-1/4" | 24 | 1-5/8" | Quote |
| 24" (600 NB) | 20 | 1-1/4" | 24 | 1-1/2" | 24 | 1-7/8" | Quote |
Stud length depends on facing and gasket, so it is confirmed per order.
Threads, marking, testing and coatings
Threads
UNC up to 1 inch and 8 UN from 1⅛ inch, class 2A/2B, per ASME B1.1. Metric ISO threads on request. Threads rolled or cut.
Marking
Studs and nuts stamped with grade symbol and Teshi mark, and heat lot traceable to the test certificate.
Testing
- Tensile, yield and hardness per grade
- Proof load on nuts
- Impact tests for L7 and LTCS grades
- PMI on alloy bolting
Coatings and packing
Plain, hot-dip galvanised, zinc-nickel, PTFE (Xylan-type) and others. Packed in boxes or bags by size, labelled per joint set on request.
Questions buyers ask
How many stud bolts does a 6 inch Class 300 flange need?
Twelve ¾ inch stud bolts, per ASME B16.5.
How is stud bolt length decided?
Length depends on flange class and thickness, facing (RF or RTJ), gasket thickness and whether hydraulic tensioning needs extra thread. We work from your gasket and facing details.
Get a quotation from the manufacturer
Send your BOQ, drawing or tender reference. You deal directly with the manufacturer.
- Reply from our estimation team, usually within one working day
- Carbon steel to titanium on one order
- EN 10204 3.1 or 3.2 certificates, third-party inspection welcome
- ISO 9001:2015 certified and IBR approved, since 1971
Drawings and BOQ spreadsheets are easiest by email. Mention your project name.