Bolts · Nuts · Washers

Fasteners

Industrial fasteners (stud bolts, hex bolts, heavy hex nuts and washers) hold flanged and structural joints together. Bright Tubes supplies ASTM A193, A194 and A320 bolting in alloy steel, stainless steel, duplex, nickel alloys and titanium.

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Fasteners products

BoltsBolts include stud bolts, hex bolts, heavy hex bolts, threaded rod and U-bolts, used to join flanges, structures and equipment.NutsNuts are internally threaded fasteners (hex and heavy hex) that mate with bolts and studs.WashersWashers spread bolt load, protect joint surfaces and help keep preload.Stud BoltsStud bolts are fully threaded rods cut to length with chamfered ends, fitted with two heavy hex nuts.Hex & Heavy Hex BoltsHex bolts have a forged hexagonal head and a partial or full thread, and are used for structural steel, equipment and machinery.Threaded RodsThreaded rods (all-thread) are continuously threaded bars supplied in standard lengths or cut to size for studs, anchors and hangers..U-BoltsU-bolts are bent rods threaded on both legs, used to clamp pipes to supports.Heavy Hex NutsHeavy hex nuts are thicker and wider across flats than regular hex nuts, and are standard for pressure and structural bolting.Hex NutsStandard hex nuts for general-purpose bolting, to ISO 4032 or ASME B18.2.2, in carbon, stainless and alloy grades..Flat WashersFlat washers distribute load under nuts and bolt heads.Spring WashersSpring (split lock) washers add some elastic preload to resist loosening under vibration in equipment assemblies..

Bolting grades and matching nuts

Common bolting grades and conventional nuts
Stud / bolt	Material	Nut	Service
ASTM A193 B7 Stud Bolts	Cr-Mo alloy steel (AISI 4140/4142/4145), quenched & tempered	A194 2H	Process piping flanges (ASME B16.5 / B16.47)
ASTM A193 B7M Stud Bolts	Cr-Mo alloy steel, tempered for controlled hardness	A194 2HM	Sour gas and oil processing
ASTM A193 B16 Stud Bolts	Cr-Mo-V alloy steel, quenched & tempered	A194 4 / 7	High-temperature steam flanges
ASTM A320 L7 Stud Bolts	Cr-Mo alloy steel, quenched & tempered, impact tested	A194 4 / 7 (low-temperature)	LNG and LPG facilities
ASTM A193 B8 Stud Bolts	Type 304 stainless steel, Class 1 (carbide solution treated) or Class 2 (strain hardened)	A194 8	Stainless steel piping flanges
ASTM A193 B8M Stud Bolts	Type 316 stainless steel, Class 1 or Class 2	A194 8M	Marine and coastal equipment

Corrosion-resistant fasteners are also available in SS 304 Stainless Steel, SS 316 Stainless Steel, Duplex 2205 Stainless Steel, Super Duplex 2507 Stainless Steel, Inconel 625, Monel 400, Hastelloy C276 and Titanium Grade 5.

Frequently asked questions

What is a stud bolt?

A threaded rod without a head, fitted with a nut on each end. It's the standard bolting for pipeline flanges.

Why use heavy hex nuts on flanges?

Heavy hex nuts are thicker and wider across flats than regular hex nuts, which suits the high preloads and larger wrench bearing surfaces needed in pressure bolting.

Are washers needed with stud bolts?

Not always. Many flange joints use none, but hardened washers are used with controlled-tightening and tensioning methods, and where specified.

Need fasteners?

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