Stud bolts, heavy hex bolts, nuts and custom fasteners for wellheads, pipelines, compression and production equipment, machined in Humble, Texas from certified round bar.
Oil and gas bolting has to hold pressure, resist corrosion and show up on time. Patriot Bolt manufactures fasteners to your drawing or the governing specification, from one-off replacements to production runs, and our team is on call 24/7 when a line is down.
We machine B7 for general flange bolting, B7M for sour service where hydrogen sulfide is present, L7 for cold-temperature and LNG service, and duplex, super duplex and nickel alloys where chlorides and corrosion are the bigger threat. Every bar is traceable to its mill test report.
- Common specsA193 · A320 · A194
- Sour serviceB7M / 2HM
- Cold serviceA320 L7
- CoatingsPTFE · Zinc-Nickel
- Support24/7
What we make for oil and gas
Stud Bolts
Full-thread, tap-end and double-end studs.
PB-02Heavy Hex Bolts
Coarse and fine thread, alloy to nickel.
PB-03Nuts
Heavy hex and specialty nuts, graded to match.
PB-0412-Point Flange Bolts
High-strength 12-point flange bolts.
PB-05Custom & Specialty Fasteners
One-off specials to production runs, to print.
PB-06Fastener Coatings
PTFE, zinc, cadmium, zinc-nickel and more.
Patriot Group companies also supply gaskets and hose and fluid transfer products.
Common grades we machine
| MATERIAL | WHY IT IS USED |
|---|---|
| ASTM A193 B7 | General pressure-boundary and flange bolting with A194 2H nuts. |
| ASTM A193 B7M | Controlled hardness for sour (H₂S) service per NACE MR0175 / ISO 15156, with 2HM nuts. |
| ASTM A320 L7 | Charpy impact tested at −150 °F for cryogenic, LNG and cold-climate bolting. |
| Duplex 2205 / Super Duplex 2507 | High strength with chloride resistance for offshore and produced-water service. |
| Inconel 625 / 718 | Nickel alloys for severe corrosion and high-strength service. |
| 17-4 PH | Precipitation-hardened stainless for strength with moderate corrosion resistance. |
See all 30+ grades in the Fastener Materials Matrix. Not sure which fits? Send the service temperature, pressure, media and any customer specification and we will recommend one.
Built to spec. Made in Texas.
Common questions
Do you make B7M stud bolts for sour service?
Yes. We machine ASTM A193 B7M studs with A194 2HM nuts, tempered to the controlled hardness required for sour (H₂S) service per NACE MR0175 / ISO 15156.
Can you make fasteners to a customer drawing or API/ASTM specification?
Yes. Send the drawing, specification or a sample and we will quote it. We machine from certified round bar and every bar is traceable to its mill test report.
Can you help with an emergency or shutdown order?
Our team is on call 24/7. Call (281) 581-0176 and we will tell you what we can turn around and when.
Send us the print.
Drawing, spec sheet, sample or part number. We will quote it fast.