Nut Series Archives | MF Fastener Industries LLC

ASTM A194 Grade 2H Heavy Hex Nut

Wed, 01 Sep 2021 11:10:55 +0000

A194 2H is the nut for every B7 stud and bolt we manufacture and supply, so we hold it in depth in Umm Al Quwain from ¼" to 4" and M12 to M100, in plain, hot-dip galvanized, zinc plated and PTFE / Xylan finishes, with 2HM available for sour service.

ASTM A194 Grade 2H Heavy Hex Nut explained

ASTM A194 Grade 2H is a heavy hex nut of quenched-and-tempered medium-carbon steel with a minimum proof load of 175 ksi, sized to ASME B18.2.2 with a larger across-flats and thickness than a standard nut. It is the standard nut for high-pressure and high-temperature flange bolting with A193 B7, B16 and A320 L7 studs, and for A325 / A490 structural bolts where DH nuts are not specified. Grade 2HM is the controlled-hardness version for NACE MR0175 sour service.

Applications

ASME B16.5 / B16.47 flange joints with B7 studs
Pressure vessels, exchangers and boilers
Valve bonnets and pump casings
Structural bolting with A325 / A490
Refinery, gas plant and pipeline connections
Anchor bolts in equipment foundations

Standards, grades & finishes

Nuts to ASTM A194 / A194M Grade 2H (2HM on request), dimensions to ASME B18.2.2 heavy hex, threads UNC / 8UN Class 2B to ASME B1.1 or metric 6H to ISO 965; galvanized nuts tapped oversize to ASTM A563 / F2329 with dry lubricant. Finishes plain, hot-dip galvanized, zinc plated, PTFE / Xylan. Hardness and proof load certified per heat.

This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. 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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Pal Nut (Push-On Speed Nut)

Sun, 09 Jun 2019 12:58:49 +0000

Pal nuts are stamped spring-steel locking nuts used over a standard nut to stop it loosening, or on their own to hold light parts on a stud or pin. We stock them in Umm Al Quwain from M4 to M30 in zinc-plated and galvanized spring steel, brass and stainless.

Pal Nut (Push-On Speed Nut) explained

A pal nut (palnut, speed nut) is a single-thread nut pressed from spring steel with a cupped rim. Screwed onto a bolt above a standard nut and tightened a quarter turn, its arched form deflects and locks the thread, holding the primary nut against vibration. Pal nuts are cheap, light and fast to fit, and are also used alone on push-on studs for trims, panels and mouldings.

Applications

Locking hex nuts on vehicles and machinery
Electrical cabinets, meters and panels
Light fittings, signage and trims
Appliance and HVAC assembly
Furniture and fixture hardware
Push-on retention of pins and studs

Standards, grades & finishes

Pal nuts in spring steel (C67S / SAE 1050) heat treated, zinc plated to ISO 4042 or hot-dip galvanized; brass CW508L; stainless 301 / 304. Sizes M4 to M30 and #6 to 1" UNC / UNF. Regular, thick and washer-faced (flanged) types. Note: single-thread nuts are not load-carrying — use as a lock nut or for light retention only.

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DIN 928 Square Weld Nut

Wed, 27 Mar 2019 07:38:44 +0000

DIN 928 square weld nuts are welded onto sheet metal to give a threaded fixing point where a loose nut cannot be reached. We stock them in Umm Al Quwain from M4 to M24 in plain low-carbon steel for projection welding, together with DIN 929 hex weld nuts.

DIN 928 Square Weld Nut explained

A DIN 928 weld nut is a square nut with four projections (weld nibs) on one face. Placed on the sheet with the projections down, a resistance welder passes current through the nibs and fuses them to the sheet in a fraction of a second, leaving a strong, flush threaded boss. The square shape is easy to locate in automated feeders and resists rotation once welded.

Applications

Vehicle bodies, chassis and cab assemblies
Electrical cabinets, panels and enclosures
Cable tray, strut and support brackets
HVAC ducting and equipment casings
Furniture, racking and shelving
Agricultural and construction equipment sheet parts

Standards, grades & finishes

Nuts to DIN 928 (square, 4 projections) and DIN 929 (hex, 3 projections), low-carbon steel (class 6 / 8), plain (unplated) for welding, threads ISO 965 6H. Also available with pilot (locating) ring. Stainless A2 weld nuts on request. Not to be galvanized before welding.

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Spring (Channel) Nut

Wed, 27 Mar 2019 07:37:46 +0000

Channel nuts slide into strut channel and lock behind the lips, so brackets, hangers and clamps can be fixed anywhere along the rail. We stock them in Umm Al Quwain from M6 to M20 with long spring, short spring and no spring, zinc plated, hot-dip galvanized and stainless A4.

Spring (Channel) Nut explained

A spring nut (channel nut, strut nut) is a rectangular nut with serrated grooves that engage the inturned lips of a strut channel (41 × 41, 41 × 21 or 41 × 62). The spring holds the nut in position while the bolt is started; once tightened the grooves bite into the lips and lock. Channel nuts are the basis of every strut support system for pipes, cable trays, HVAC and electrical services.

Applications

Pipe supports and clamps on strut channel
Cable tray, ladder and conduit brackets
HVAC duct hangers and equipment frames
Electrical panels and busbar supports
Solar panel rails and seismic bracing
Mezzanine and modular frame assemblies

Standards, grades & finishes

Nuts for 41 mm strut channel to manufacturer / BS 6946 dimensions, low-carbon steel case hardened, class 6 / 8 thread ISO 965 6H, springs in zinc-plated spring steel; stainless A4 (316) nuts and springs for external use. Finishes zinc plated to ISO 4042, hot-dip galvanized to ISO 1461. M6 to M20 with long spring (standard), short spring (shallow channel) or plain.

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Jam (Thin) Hex Nut

Tue, 26 Mar 2019 15:18:33 +0000

Jam nuts are half-height hex nuts used to lock a full nut or to secure a component where there is no room for a standard nut. We stock DIN 439 / ISO 4035 in Umm Al Quwain from M4 to M52 in steel and stainless A2 / A4, zinc plated or plain.

Jam (Thin) Hex Nut explained

A jam nut (thin nut, lock nut, half nut) is about half the height of a standard hex nut. Tightened against a full nut it jams the threads and stops the assembly working loose — the traditional double-nut lock. It is also used where a thin nut is needed to hold a bearing, adjuster, sensor or spindle in position. Because the thread engagement is short, jam nuts are not used alone to carry full bolt load.

Applications

Double-nut locking on threaded rod and adjusters
Bearing, spindle and shaft retention
Sensors, fittings and instrument mounting
Turnbuckles, tie rods and stay bars
Electrical panels and busbar supports
Pipe hangers and clevis adjustments

Standards, grades & finishes

Nuts to DIN 439 / ISO 4035 (chamfered) and ISO 4036 (unchamfered), property class 04 and 05 to ISO 898-2, stainless A2 / A4 to ISO 3506-2, threads ISO 965 6H coarse or fine (DIN 439-2). Finishes zinc plated to ISO 4042, plain, hot-dip galvanized.

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Long (Coupling) Nut

Tue, 26 Mar 2019 15:18:33 +0000

Coupling nuts join two threaded rods end to end or connect a stud to a hanger, and we stock DIN 6334 in Umm Al Quwain from M5 to M36 in steel class 6 / 8 and stainless A2 / A4, zinc plated, hot-dip galvanized or plain, with reducing and hex-to-round types on request.

Long (Coupling) Nut explained

A long nut (coupling nut, extension nut) is a hex nut three diameters long, threaded through, so two rods can be screwed in from each end and locked with jam nuts. It is the standard connector for threaded rod hangers, chemical anchor extensions and tie rods, and is also used with a left-hand / right-hand thread as a simple turnbuckle. Reducing coupling nuts join two different diameters.

Applications

Threaded rod hangers for HVAC, fire and cable services
Chemical anchor and drop-in anchor extensions
Tie rods, sag rods and bracing
Formwork and scaffold ties
Seismic bracing and restraint systems
Adjustable feet and levelling screws

Standards, grades & finishes

Nuts to DIN 6334 (length 3 × d), property class 6 and 8 to ISO 898-2, stainless A2 / A4 to ISO 3506-2, threads ISO 965 6H coarse; fine thread, UNC, reducing and LH / RH types to order. Finishes zinc plated to ISO 4042, hot-dip galvanized to ISO 10684, plain stainless.

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Flange Nut (Serrated)

Tue, 26 Mar 2019 15:18:32 +0000

Flange nuts with a serrated face grip the surface and resist loosening under vibration without a separate washer, which is why they are standard on machinery, vehicles and steel framing. We stock DIN 6923 / ISO 4161 in Umm Al Quwain from M5 to M30, class 8 and 10, zinc plated and hot-dip galvanized.

Flange Nut (Serrated) explained

A hex flange nut has an integral washer flange under the hex that spreads clamping load over a larger area and protects the surface. The serrated version has radial ribs on the flange face that bite into the mating surface, providing a prevailing resistance to rotation. Plain-flange nuts are used on painted or soft materials where the serrations would mark. Flange nuts install faster than nut-plus-washer and cannot be assembled without their washer.

Applications

Vehicle chassis, bus and truck bodies
Conveyors, screens and vibrating equipment
Steel framing, purlins and cladding rails
Pumps, motors and gearbox mounting
Solar structures and cable ladders
Modular fencing and playground equipment

Standards, grades & finishes

Nuts to DIN 6923 / ISO 4161 (serrated or plain), property class 8 and 10 to ISO 898-2, stainless A2 / A4, threads ISO 965 6H. Finishes zinc plated to ISO 4042, zinc flake, hot-dip galvanized to ISO 10684. Matching DIN 6921 flange bolts stocked.

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Square Weld Nut (ISO / DIN)

Tue, 26 Mar 2019 15:18:31 +0000

Weld-on square nuts give a threaded fixing on fabricated steel — brackets, tube frames, base plates — where a tapped hole would be too thin or a loose nut inaccessible. We stock them in Umm Al Quwain from M10 to M24 in plain low-carbon steel for both projection and arc welding.

Square Weld Nut (ISO / DIN) explained

This square weld nut is the heavier fabrication version of the DIN 928 sheet-metal nut: thicker, with a plain or pilot face, suited to MIG / TIG or projection welding onto plate 3 mm and up, angles and hollow sections. Once welded, the nut becomes a permanent threaded boss for bolts, studs or levelling screws. Supplied unplated so the weld is clean; the fabrication is galvanized or painted afterwards.

Applications

Column base plates and steel frames
Tube and hollow-section furniture and racks
Equipment brackets and mounting plates
Trailer chassis and vehicle frames
Cable ladder and support fabrications
Levelling feet and adjuster bosses

Standards, grades & finishes

Nuts to ISO / DIN square weld nut dimensions (DIN 928 pattern, heavy series), low-carbon steel class 6 / 8, threads ISO 965 6H. Plain (unplated) finish for welding; stainless A2 / A4 weld nuts for stainless fabrications. Sizes M10 to M24; hex weld nuts DIN 929 also stocked.

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Lifting Eye Nut DIN 582

Tue, 26 Mar 2019 15:18:30 +0000

Lifting eye nuts give a certified lifting point on the end of a stud, eye bolt or threaded rod, and we stock DIN 582 in Umm Al Quwain from M6 to M48 in forged carbon steel and stainless — zinc plated, hot-dip galvanized or plain — with working loads stamped and test certificates supplied.

Lifting Eye Nut DIN 582 explained

A DIN 582 lifting eye nut is a drop-forged nut with an integral eye and a collar, the companion to the DIN 580 eye bolt. Screwed fully down onto a stud or rod so the collar seats, it gives a lifting point with a rated working load for vertical lifts and reduced loads at angles per the DIN 582 table. Common uses are lifting machines by their foundation studs, panels and precast elements on threaded inserts, and as anchor points for guys and stays.

Applications

Lifting machines and equipment via studs
Precast concrete lifting inserts
Transformers, switchgear and generator sets
Moulds, dies and heavy tooling
Guy, stay and cable anchor points
Marine and offshore fittings (A4)

Standards, grades & finishes

Eye nuts to DIN 582 / ISO 3266, drop forged C15E carbon steel (normalized) or stainless A2 / A4, threads ISO 965 6H. Working load limit stamped; proof tested 2.5 × WLL. Finishes zinc plated to ISO 4042, hot-dip galvanized to ISO 1461, plain stainless. Certificate of conformity and test certificate with each delivery.

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Dome (Cap) Nut

Tue, 26 Mar 2019 15:18:30 +0000

Dome nuts finish a bolt end with a closed cap that covers the thread, protecting people from sharp edges and the thread from damage. We stock DIN 1587 in Umm Al Quwain from M3 to M30 in stainless A2 / A4, zinc-plated steel and brass.

Dome (Cap) Nut explained

A dome nut (cap nut, acorn nut) is a hex nut with a domed closed end. It is used on exposed bolt ends in handrails, playground equipment, furniture, vehicle bodies and architectural fixings, both for safety and for a clean finish. Because the cap is closed, the bolt must not project beyond the nut thread depth — length is critical. High (DIN 1587) and low (DIN 917) forms are available.

Applications

Handrails, balustrades and glass fixings
Playground and public furniture
Bus, truck and trailer bodies
Signage, façade and canopy fixings
Machine guards and covers
Marine and pool fittings (A4)

Standards, grades & finishes

Nuts to DIN 1587 (high form) and DIN 917 (low form), stainless A2-70 / A4-80 to ISO 3506-2, carbon steel class 6 zinc plated, brass CW614N, threads ISO 965 6H. Two-piece (welded cap) or one-piece (solid) construction. Polished stainless on request.

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