Stud Bolt Archives | MF Fastener Industries LLC

ASTM A193 B8 / B8M Stud Bolts with A194 8 / 8M Nuts

Thu, 04 Sep 2025 11:30:41 +0000

We manufacture B8 and B8M stainless stud bolts in our Umm Al Quwain plant from certified 304 and 316 bar, thread-rolled full length and supplied with ASTM A194 Grade 8 / 8M heavy hex nuts. Class 1 (solution annealed) and Class 2 (strain hardened) are both available in ¼" to 3" and M12 to M64.

ASTM A193 B8 / B8M Stud Bolts with A194 8 / 8M Nuts explained

ASTM A193 B8 is austenitic stainless steel type 304 and B8M is type 316, the molybdenum-bearing grade with better resistance to chlorides and pitting. Class 1 studs are solution annealed for maximum corrosion resistance and high-temperature service; Class 2 are strain hardened for higher strength (up to 125 ksi tensile in small sizes). Stainless studs are used where carbon-steel B7 would corrode or contaminate the process.

Applications

Seawater, desalination and marine piping
Food, pharmaceutical and dairy process lines
Chemical and chlorine service flanges
Cryogenic and LNG connections
Stainless steel pipework in water treatment
Architectural and exposed structural fixings

Standards, grades & finishes

Studs to ASTM A193 / A193M Grade B8 or B8M, Class 1 or Class 2, threads UNC / 8UN Class 2A or metric 6g. Nuts to ASTM A194 Grade 8 / 8M with anti-galling lubricant applied on request. Washers in matching stainless. PMI (positive material identification) test available for every lot.

Anchor bolts, studs and plate washers are manufactured in our own ISO 9001:2015 plant in Emirates Modern Industrial Area, Umm Al Quwain, with calibrated in-house dimensional and thread inspection. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.

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Stud Bolt — Xylan (PTFE) Coated

Thu, 20 Jun 2019 10:42:16 +0000

Our PTFE-coated stud bolts are ASTM A193 B7 studs manufactured in our Umm Al Quwain plant and finished with a Xylan fluoropolymer coating for corrosion resistance and low, consistent friction. They are supplied with matching coated ASTM A194 2H heavy hex nuts and are the standard bolting for offshore platforms, jetties and chemical plants in the Gulf.

Stud Bolt — Xylan (PTFE) Coated explained

Xylan (PTFE) coating is a thin fluoropolymer film applied over a zinc or phosphate base layer. It gives the stud a low, repeatable coefficient of friction — so torque converts to bolt tension accurately — and protects against salt spray for over 1,000 hours in ASTM B117 testing. The coating is available in blue (Xylan 1070), green (Xylan 1424) and other colours for grade identification on site.

Applications

Offshore platforms, jetties and marine terminals
Seawater cooling and desalination piping
Chemical, fertilizer and sulphur plants
Flange joints requiring accurate torque control
Buried or splash-zone pipelines
Tank farm and loading arm connections

Standards, grades & finishes

Studs to ASTM A193 B7 / B7M or B16, nuts to ASTM A194 2H / 2HM, coated to Xylan 1070, 1424 or 1052 per customer specification with dry-film thickness 20–30 µm. Threads UNC / 8UN Class 2A or metric 6g with nuts tapped to accommodate the coating. Salt-spray, coating thickness and adhesion reports supplied with the mill test certificate.

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ASTM A193 B7 Stud Bolt

Fri, 29 Mar 2019 15:08:24 +0000

ASTM A193 B7 stud bolts are one of the three products we manufacture ourselves. Studs are cut from quenched-and-tempered AISI 4140 B7 bar, thread-rolled full length, chamfered and stamped with grade and heat number in our Umm Al Quwain plant, then supplied with ASTM A194 2H heavy hex nuts. Sizes from ¼" to 4" and M12 to M72, in any length.

ASTM A193 B7 Stud Bolt explained

ASTM A193 Grade B7 is the standard alloy-steel bolting material for flanged joints in high-temperature and high-pressure service. A stud bolt is a rod threaded from end to end with a nut on each side, which loads the joint evenly and can be replaced without disturbing the flange. B7 studs are supplied with 2H nuts to ASTM A194 and are the default choice for ASME B16.5 flanges in oil, gas, petrochemical and power piping.

Applications

ASME B16.5 / B16.47 flange bolting
Pressure vessels, heat exchangers and boilers
Valve bonnets and pump casings
Refinery, gas plant and pipeline connections
Power station steam and water lines
Desalination and water treatment flanges

Standards, grades & finishes

Studs conform to ASTM A193 / A193M Grade B7 (Cr-Mo alloy, 125 ksi tensile, 105 ksi yield up to 2½"), threads UNC or 8UN Class 2A to ASME B1.1 or metric 6g to ISO 965. Nuts to ASTM A194 Grade 2H. Lengths to ASME B16.5 tables or your isometric. Finishes: plain (oiled), hot-dip galvanized, zinc plated, PTFE / Xylan fluoropolymer. Charpy impact testing for B7M or low-temperature service on request.

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Double End Stud Bolt

Tue, 26 Mar 2019 06:54:25 +0000

Double end studs have a short thread on one end for tapping into a housing and a longer thread on the other for the nut. We manufacture them in our Umm Al Quwain plant in stainless and carbon steel, M5 to M30, to DIN 938, 939 and 835 or to your length and thread split.

Double End Stud Bolt explained

A double end stud (tap-end stud) is threaded at both ends with a plain shank between. One end is screwed permanently into a tapped hole in a casting, flange or machine body; the other takes the nut. DIN 938 has a tapping length of 1×d, DIN 939 1.25×d and DIN 835 2×d, matched to the strength of the housing material — steel, cast iron or aluminium respectively.

Applications

Engine, gearbox and pump housing studs
Valve and flange studs into cast bodies
Machine tool and press fixtures
Cylinder head and manifold studs
Aluminium casting assemblies (DIN 835)
Marine and offshore equipment

Standards, grades & finishes

Manufactured to DIN 938 / 939 / 835 or ISO dimensions in property class 5.8, 8.8 and 10.9, stainless A2-70 and A4-80. Threads metric coarse or fine to ISO 965 6g. Finish self colour, zinc plated or plain stainless. Supplied with DIN 934 nuts and washers on request.

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