Petrochemical stud bolts.
Stud bolts and nuts made to spec in Perth and Melbourne. ISO 9001 certified, marked for traceability and supplied with full certification and independent test reports.
- B7 to B16Seven ASTM grades from stock
- 3/8" to 4"Plus M10 to M100 metric
- ISO 9001Certified production in Perth & Melbourne
- 100%Traceable to raw material
Built for joints that can't leak.
From offshore platforms to tank farms, we supply the stud bolting that holds pressure, heat and corrosive service together.
Offshore
Shipping
Refinery
On-shore storage
The right grade, matched nut included.
Imperial and metric stud bolts with their compatible ASTM A194 nuts, held in stock and ready to cut, thread and certify.
| Stud bolt grade | Diameter range | Service temperature | Compatible nut |
|---|---|---|---|
| A193 B7 | 3/8" to 4" M10 to M100 | -30°C to 400°C | A194 2H |
| A193 B7M | 3/8" to 4" M10 to M100 | -30°C to 400°C | A194 2HM |
| A320 L7 | 3/8" to 4" M10 to M100 | -101°C to 538°C | A194 7L |
| A320 L7M | 3/8" to 2-1/2" & metric | Low temperature service | A194 7L |
| A193/A320 B8 Class 2 | 3/8" to 1-1/2" | -150°C to 575°C | A194 8 |
| A193/A320 B8M Class 2 | 3/8" to 1-1/2" | -150°C to 575°C | A194 8M |
| A193 B16 | 1/2" to 3-1/2" | 0°C to 525°C | A194 7L |
Service temperatures are actual metal temperatures. Threads up to 1" are typically UNC, over 1" typically 8UN. Metric diameters on request.
Special materials on order
For high-alloy, seawater and chemical service specifications, we source and certify:
- B8T
- Duplex
- Super Duplex
- Monel 400
- Monel K500
- Hastelloy
- Incoloy
- Inconel
- Titanium
How to order
Give us the nominal diameter d, the nominal length l, grade, coating and quantity. Build your quote request
Build your stud bolt list.
Add a line for each size you need, from stock grades through to special materials. Our stud bolt team prices it up and comes back with lead time and certification.
Match the finish to the environment.
From a plain oiled stud for dry indoor plant to PTFE systems rated past 1,000 hours of salt spray. The bar shows corrosion protection, from mild to severe service.
Plain, light oil
No corrosion protection. Outdoors, red rust shows within days and threads can seize.
- Friction
- 0.20
Zinc plated
Clear or yellow chromate. Minimal protection, mild environments only.
- Thickness
- 3 to 5 µm
- Friction
- 0.29
Galvanised
Proven against weather and industrial atmospheres. Not for seawater immersion or direct chemical contact.
- Thickness
- ~50 µm
- Tip
- Lightly oil to tighten
Zinc nickel
High-performance electroplate for marine, industrial and offshore work. Holds up at elevated temperatures with consistent torque-tension.
- Protection
- Sacrificial
Moly disulphide
Grey to black over phosphate. Resists acid, alkali and solvents, with built-in anti-seize.
- Salt spray
- 100 to 300 h
- Friction
- 0.03 to 0.18
- Range
- -70 to 300°C
Inorganic zinc silicate
The "Esso specification". Decades of service on offshore platforms and coastal steelwork, and the primer of choice for multi-coat systems.
- Service
- Severe marine
Xylan® PTFE 1014 · 1070 · 1424
For total seawater immersion, constant spray or chemical exposure, and joints that must come apart again without seizing.
- Salt spray
- 500 to 1,000+ h
- Friction
- 0.04 to 0.10
- Thickness
- 25 to 35 µm
Thicker coatings need nut tapping adjusted for correct thread fit. We set that up for you. Other coatings available on request.
Totally documented & traceableEvery stud, on paper.
Your QA team gets the documents to sign off, from raw material to finished stud.
- ISO 9001 certified
Rigorous quality control across production in Perth and Melbourne.
- Marked for traceability
Studs are grade-marked during manufacture and traceable back to the raw material.
- Full certification
Mechanical testing and material composition, with independent third-party verification included.
- Vetted supply chain
Leading local and international suppliers, many holding American Petroleum Institute (API) certification.
Mechanical testing
Material composition
Thread & dimension checks
Surface finish
Everything for the joint.
Order the gaskets, insulation and tensioning gear with the stud bolts, on one order and one account.
Flange gaskets
Leak-tight seals for thermal cycling, vibration and aggressive media.
- Spiral wound
- Ring type joint (RTJ)
- Kammprofile
- Flat and soft-cut
- Metal jacketed
- Corrugated
Flange insulation kits
Stop galvanic corrosion and stray current, and protect cathodic protection systems.
- Insulating sleeves & washers
- Insulating gaskets
- TopHat bolt insulators
- G10, G11, Phenolic, Mylar, PTFE
Nord-Lock Superbolt™
Tension large, critical bolts with hand tools instead of heavy torque gear.
- Faster shutdown work
- Even, repeatable clamp load
- Safer in tight spaces
- Less rework
Torque guidance, on hand.
Pick a grade and diameter for theoretical tightening torques at 30% and 60% of yield load, straight from our product guide.
Theoretical values assuming the studs are lubricated to a friction coefficient of 0.20. For guidance only: confirm final torques with the engineer responsible for the joint. Field experience suggests clamp loads above 44% of yield can deform flanges.
Tighten in four passes
- 1Snug all stud bolts lightly
- 2Tighten to about 30%
- 3Tighten to about 60%
- 4Final pass at 100%
Always tighten in a cross pattern. Once at final torque, keep going round until the nuts stop turning, and leave at least two full threads past the nut.
Lubricant friction (approx.)
| Dry stainless steel | 0.30 |
|---|---|
| Dry zinc plated | 0.29 |
| Dry steel | 0.25 |
| Machine oil | 0.20 |
| Moly grease or copper anti-seize | 0.15 |
| Solid PTFE film | 0.04 to 0.10 |
The full product guide.
Twenty pages of reference data for engineers, buyers and maintenance crews.
- Chemical composition
- Mechanical properties
- Nut dimensions
- Full torque tables
- Weights per 100
- Gasket selection
- Coating guide
Stud bolt questions.
Can you make stud bolts to my length and spec?
Yes. Our Perth and Melbourne facilities produce custom stud bolting for gas, petroleum and chemical work. Send us the diameter, length, grade, coating and quantity and we'll quote.
What certification comes with them?
All petrochemical products can be supplied with full certification covering mechanical testing and material composition, with independent third-party verification testing included in our certification packages.
Which nut goes with which stud?
B7 with A194 2H, B7M with 2HM, L7, L7M and B16 with 7L, B8 Class 2 with Grade 8, and B8M Class 2 with Grade 8M.
What thread do you supply?
Stud bolts up to and including 1" are typically UNC. Over 1" is typically 8UN. Metric diameters are available on request.
Do you supply gaskets and insulation kits too?
Yes. Spiral wound, RTJ, kammprofile, flat, metal jacketed and corrugated gaskets, flange insulation kits and Nord-Lock Superbolt tensioners, all on the same order.
Can you deliver to remote sites?
Yes. We deliver to any location across Australasia, and our procurement team can export if your project is overseas.
Get a quote on your spec.
Tell us the grade, size, coating and certification you need. We'll come back with price, lead time and paperwork.
1300 KONNECT (566 632)
Made in Perth & Melbourne