Duplex, titanium and nickel-alloy bolting
Studs and nuts that match exotic flange grades, so the joint resists the same environment as the pipe.
About exotic-alloy bolting
Carbon steel bolts on an alloy flange can corrode or cause galvanic attack. Matching the bolting grade to the flange avoids that. We supply these bolting grades with our exotic-grade flanges.
Grades
| Grade | Specification | Notes |
|---|---|---|
| Duplex / super duplex | ASTM A1082, A276 S31803, S32205, S32750, S32760 | Seawater, offshore |
| Titanium Gr 2, 5, 7 | ASTM F468 / F467, B348 | Seawater, chlorine |
| Inconel 625 / 718 | ASTM B446, B637 | High strength, sour and hot service |
| Hastelloy C276 | ASTM B574 | Mixed acids, chlorides |
| Monel 400 / K-500 | ASTM B164, B865 | HF acid, seawater |
Need exotic-alloy bolting? Get a price from the manufacturer.
Send diameter, length, grade, coating and quantity, or the flange list.
Bolt set finder
Studs and nuts per flange joint, with d, F and H on the drawing.
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.
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
Are titanium studs strong enough for flange joints?
Grade 2 titanium is relatively low strength and suits lower-pressure joints. Grade 5 (Ti-6Al-4V) has strength similar to B7 and is used where higher bolt load is needed.
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.