Stud Bolt B7 / 2H (ASTM A193 / A194) – Supplier in Dubai UAE

Premium Quality Stud Bolts Supplier in Dubai, UAE

A B7/2H stud bolt is the standard flange fastener of the oil and gas industry: a fully threaded alloy steel stud made to ASTM A193 Grade B7, fitted with two heavy hex nuts made to ASTM A194 Grade 2H. B7 is quenched and tempered chromium-molybdenum steel with 125 ksi minimum tensile (up to 2.5 inch diameter), rated for service from roughly -29°C to +400°C, which covers most piping, valve and vessel flanges a plant contains. Unifastener Industries LLC stocks and cuts B7/2H stud bolts in Umm Al Quwain, UAE, with the coatings Gulf plants actually specify and mill test certificates on every lot.

Variants that matter

Three letters change everything in stud bolts. B7M is the controlled-hardness version (max 235 HB) required for sour service under NACE MR0175 / ISO 15156; if the line carries H2S, the spec says B7M and 2HM nuts, and substituting standard B7 is a compliance failure, not a shortcut. L7 with Grade 4 or 7 nuts covers low-temperature service below -29°C. For stainless flanges, B8 (304) and B8M (316) Class 1 and 2 replace the alloy steel studs. Tell us the line class or send the piping spec sheet and we match the grade rather than guessing.

What we supply

• A193 B7 studs, fully threaded, 1/4″ to 2-1/2″ diameter, cut to any length
• A194 2H heavy hex nuts, two per stud, or as specified
• B7M/2HM for NACE sour service; L7 for low temperature; B8/B8M stainless
• Coatings: PTFE (blue and other colors), Xylan, hot dip galvanized, zinc, plain black
• Bagged per flange size with MTCs; charts available for flange-to-stud sizing

Standards:
– ASTM A193 (Grades B7, B16 for high temperature / pressure service)
– ASTM A320 (low temperature service)
– ASTM A307 (general purpose)
– DIN 976 (threaded rods / stud bolts)
– ISO 898-1 (mechanical properties of fasteners)

Grades:
– ASTM Grades: A193 B7, B7M, B16, A320 L7, A307
– DIN / ISO Grades: 4.6, 5.6, 8.8, 10.9, 12.9

Material Options:
– Carbon steel
– Alloy steel (heat-treated for high tensile strength)
– Stainless steel (A2 / A4 grades)
– Inconel, Monel, Duplex & Super Duplex (special alloys for oil & gas)
– Brass / Copper alloys (special industrial use)

Diameter Range: M6 to M100 (metric) / 1/4″ to 4″ (inch)

Length Range: 20mm up to 5000mm (custom sizes available)

Thread Types:
– Metric coarse pitch (DIN 13 / ISO 261)
– Metric fine pitch (on request)
– UNC (Unified Coarse, ASTM)
– UNF (Unified Fine, ASTM)
– Fully threaded or double-ended studs

End Types:
– Plain ends
– Chamfered ends
– Rounded ends
– Tap-end studs (one side longer thread)

Coating Options:
– Plain (self-color)
– Hot-dip galvanized (ASTM A153 / DIN EN ISO 1461)
– Zinc electroplated
– Cadmium plated (special aerospace use)
– PTFE / Xylan coated
– Epoxy coated

Add-ons:
– Supplied with heavy hex nuts (ASTM A194 / DIN 934)
– Washers (DIN 125 / ASTM F436)
– Can be supplied with 3.1 MTC and third-party inspection reports

FAQ

Q: What does B7/2H mean?
A: B7 is the stud grade under ASTM A193, a quenched and tempered chrome-moly alloy steel. 2H is the matching heavy hex nut grade under ASTM A194. Together they are the standard flange bolting assembly.

Q: When is B7M required instead of B7?
A: In sour (H2S) service governed by NACE MR0175 / ISO 15156. B7M has controlled maximum hardness of 235 HB and pairs with 2HM nuts. It is a compliance requirement, not a preference.

Q: Why are stud bolts PTFE coated?
A: PTFE gives consistent torque, corrosion resistance in coastal plants, and studs that break out cleanly at the next shutdown instead of seizing. Blue is the common Gulf color; others are available.

Q: Can you cut studs to length?
A: Yes, any length from stock bar, same-day for common diameters, bagged per flange with nuts.

Q: Do you provide test certificates?
A: Mill test certificates ship with every lot; positive material identification (PMI) can be arranged on request.