Washer Series Archives | MF Fastener Industries LLC

DIN 125A Flat Washer

Tue, 26 Mar 2019 15:19:02 +0000

DIN 125A flat washers are stocked in every size and finish in Umm Al Quwain — M2 to M64 and imperial — in mild steel 140 HV, hardened 200 HV, stainless A2 / A4, zinc plated, hot-dip galvanized and plain, plus DIN 9021 large-diameter and DIN 7349 thick washers.

DIN 125A Flat Washer explained

A flat washer spreads the load of a bolt head or nut over a larger area, protects the surface and gives a smooth bearing face for tightening. DIN 125A (ISO 7089) is the standard medium-series washer with chamfer on one side; DIN 126 / ISO 7091 is the coarse (product grade C) version with larger hole; DIN 9021 / ISO 7093 is the large (penny / mudguard) washer for soft materials and oversized holes; DIN 7349 is the thick washer for high loads.

Applications

Under every bolt head and nut in general assembly
Steel structures, PEB and cladding
Machinery, vehicles and equipment
Electrical panels and cable tray
Timber and plastics (large series)
Marine, pool and food equipment (stainless)

Standards, grades & finishes

Washers to DIN 125A / ISO 7089 (chamfered), DIN 125B / ISO 7090 (with chamfer), DIN 126 / ISO 7091, DIN 9021 / ISO 7093 large, DIN 7349 thick, DIN 433 small, in mild steel 140 HV or hardened 200 HV / 300 HV, stainless A2 / A4, brass. Finishes zinc plated to ISO 4042, hot-dip galvanized to ISO 10684, plain. Imperial SAE / USS to ASME B18.21.1.

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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ASTM F436 Hardened Washer

Tue, 26 Mar 2019 15:19:01 +0000

F436 washers are the hardened washers required under the turned element of every A325 / A490 structural assembly and under anchor bolt nuts, and we stock them in Umm Al Quwain from M10 to M72 and ½" to 3", plain and hot-dip galvanized, loose or as part of matched bolt assemblies.

ASTM F436 Hardened Washer explained

ASTM F436 covers hardened steel washers (38–45 HRC) for use with high-strength structural bolts. The hardened face prevents galling and distributes the high clamping force of pretensioned bolts without embedding into the steel. Type 1 is carbon steel; Type 3 is weathering steel for A325 / A490 Type 3 bolts. Beveled (square taper) and extra-thick / clipped variants are covered by the same standard.

Applications

A325 / A490 (F3125) structural bolt assemblies
Anchor bolts to ASTM F1554
A193 B7 bolts and studs in equipment
Bridge, tower and crane girder connections
PEB and warehouse steel frames
Tension control bolt assemblies

Standards, grades & finishes

Washers to ASTM F436 / F436M Type 1 (Type 3 to order), through-hardened 38–45 HRC, dimensions circular, beveled or clipped, plain or hot-dip galvanized to ASTM F2329 / A153. Equivalent to EN 14399-5 / -6 for many specifications. Hardness certified per lot.

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Hillside Washer

Tue, 26 Mar 2019 15:18:34 +0000

Hillside washers give a square seat for a nut on an angled surface — the sloping flange of a beam or channel, or a rod that meets a plate at an angle — and we stock them in Umm Al Quwain from M12 to M36 in ductile cast iron and steel, hot-dip galvanized or plain.

Hillside Washer explained

A hillside washer is a self-aligning washer: a cast body with a curved (cambered) underside and a countersunk hole. Placed on the sloped face, it rocks to find its own seat so the nut bears evenly and the bolt is not bent — accommodating angles up to about 15°. It replaces the wedge (taper) washer where the angle is unknown or variable, and is common on tie rods, tensioned cables and machinery hold-downs.

Applications

Tie rods and bracing on sloped beam flanges
Guy anchors and cable tensioners at an angle
Machinery and conveyor hold-downs on channels
Bridge deck hangers and sway bracing
Pipe rack and support angles
Timber and log construction (large series)

Standards, grades & finishes

Washers in ductile cast iron (EN-GJS-400 / ASTM A536) or forged steel, dimensions to ASTM / ANSI / DIN manufacturer standards or to drawing, bolt sizes M12 to M36 (½" to 1½"), accommodating angles to 15°. Finishes hot-dip galvanized to ISO 1461 / ASTM A153, black or painted.

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Spring Washer DIN 127

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

DIN 127 spring washers are stocked in bulk in Umm Al Quwain in every size from M2 to M64 — zinc-plated and galvanized spring steel and stainless A2 / A4 — plus DIN 7980 narrow washers for socket cap screws and imperial split lock washers.

Spring Washer DIN 127 explained

A spring washer (split lock washer, helical spring washer) is a single coil of square-section spring steel. Compressed under the nut it exerts an axial force that maintains bolt tension and its sharp ends resist rotation, reducing loosening under moderate vibration. DIN 127 B has plain ends; DIN 127 A has bent ends; DIN 7980 is the narrow version for cap screw heads. For severe vibration use wedge lock washers or prevailing-torque nuts.

Applications

General machinery and equipment assembly
Electrical panels, busbars and switchgear
Steel structures, towers and fencing (HDG)
Vehicles, trailers and agricultural equipment
Pumps, fans and HVAC units
Marine and pool fittings (A4)

Standards, grades & finishes

Washers to DIN 127 B / ISO 7980, DIN 127 A, DIN 7980 (narrow), DIN 128 (curved), spring steel 38Si7 / 60SiCr7 hardened 42–50 HRC, stainless A2 / A4 (spring quality) to ISO 3506. Finishes zinc plated to ISO 4042, mechanically or hot-dip galvanized, plain stainless. Imperial regular and heavy split lock washers to ASME B18.21.1.

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Taper Washer

Tue, 26 Mar 2019 08:24:01 +0000

Taper washers compensate for the slope of channel and I-beam flanges so the nut sits square and the bolt is not bent. We stock DIN 434 (8%, channels) and DIN 435 (14%, I-beams) in Umm Al Quwain from M8 to M36 in steel, hot-dip galvanized or plain.

Taper Washer explained

A taper washer (wedge washer) is a square washer with one face machined or forged at an angle matching the flange slope of a rolled section. DIN 434 has an 8% (about 4.6°) taper for U-channels (UPN); DIN 435 has a 14% (8°) taper for I-beams (IPN) and the heavy flanges of older sections. Placed with the thick edge toward the web, it gives a flat, square bearing face for the nut or bolt head. ASTM F436 beveled washers serve the same purpose for American sections (1:6).

Applications

Bolting to channel and I-beam flanges
Crane rail clips and runway beams
Bracing and tie-rod connections
Conveyor, pipe rack and platform framing
Steel building purlin cleats
Repairs and strengthening of existing structures

Standards, grades & finishes

Washers to DIN 434 (8%) and DIN 435 (14%), steel S235 / S355, square form, bolt sizes M8 to M36. ASTM F436 beveled (1:6) to order. Finishes hot-dip galvanized to ISO 1461, plain, zinc plated. Hardened versions for pretensioned assemblies on request.

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Plate Washer (Square & Round)

Tue, 26 Mar 2019 08:23:33 +0000

Plate washers are one of the three products we manufacture ourselves. They are cut from certified plate, drilled or punched to your hole size and finished in our Umm Al Quwain plant — square, round or rectangular, from 3 mm to 40 mm thick, in carbon steel, alloy steel and stainless. They ship with our anchor bolts as a set or separately in bulk.

Plate Washer (Square & Round) explained

A plate washer is a thick, large-diameter washer used under a nut where the bearing area of a standard washer is not enough — over slotted or oversized holes in base plates, on soft materials such as timber, or on anchor bolts where the washer must spread the load over the concrete or plate. Square plate washers are standard for anchor bolt sets and holding-down bolts; round plate washers are used where the washer must fit a recess or pocket.

Applications

Anchor bolt sets and holding-down bolt assemblies
Column base plates with oversized holes (AISC / BS 5950)
Timber and glulam structural connections
Formwork and tie-rod bearing plates
Tower, mast and guy anchor bases
Heavy equipment and machine hold-downs

Standards, grades & finishes

Manufactured to ISO / DIN (DIN 436 square, DIN 440 round), ASTM F436 Type 1 dimensions where specified, or to your drawing. Plate S275JR, S355JR, EN8 or SS304 / SS316 with mill certificates. Standard hole clearance bolt +2 mm; slotted holes on request. Finish self colour, hot-dip galvanized to ISO 1461 / ASTM A153, zinc plated or plain stainless.

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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Nord-Lock Wedge Lock Washer

Tue, 26 Mar 2019 08:21:43 +0000

Wedge lock washers are the answer where nyloc nuts and spring washers still loosen — vibrating screens, crushers, rail, wind and heavy transport. We stock the Nord-Lock type in Umm Al Quwain from M3 to M42 in zinc-flake coated steel and 316L stainless, in standard and large outer diameter.

Nord-Lock Wedge Lock Washer explained

A wedge lock washer is a pair of hardened washers with cam faces on the inside and radial teeth on the outside. The cam angle is greater than the thread pitch, so any attempt by the bolt to rotate loose forces the pair apart, increasing bolt tension rather than releasing it. The teeth grip the bolt head and mating surface. Wedge lock washers are proven to Junker vibration test and are reusable.

Applications

Vibrating screens, crushers and mills
Rail, rolling stock and track fixings
Wind turbine and tower bolting
Trucks, trailers, buses and off-road equipment
Pumps, compressors and reciprocating machinery
Cranes, hoists and mining equipment

Standards, grades & finishes

Washer pairs to DIN 25201 Part 4 and Nord-Lock dimensions, hardened steel with Delta Protekt zinc flake coating (1,000 h salt spray) or 316L stainless (A4), standard (NL) and large outer diameter (NLsp) for slotted holes. Sizes M3 to M42 (M45 to M130 to order). Junker test reports available. Reusable; install with the cams facing each other.

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DTI Washer (Direct Tension Indicator)

Tue, 26 Mar 2019 08:20:44 +0000

DTI washers show visually that a structural bolt has reached its required pretension, which removes the guesswork from turn-of-nut and calibrated-wrench methods. We stock ASTM F959 / EN 14399-9 DTIs in Umm Al Quwain from M12 to M36 and ½" to 1½" for grade 8.8 / 10.9 and A325 / A490 assemblies, plain and galvanized, with feeler gauges.

DTI Washer (Direct Tension Indicator) explained

A direct tension indicator is a hardened washer with raised protrusions (bumps) on one face. Placed under the bolt head or nut, the bumps flatten as the bolt is tensioned; when a 0.4 mm (0.015") feeler gauge is refused at the required number of gaps, the bolt has reached its minimum pretension. DTIs are recognised by RCSC, AISC, EN 1090 and BS 5950 as a bolt-tension verification method and are especially useful on galvanized and large assemblies.

Applications

Bridge and highway structure bolting
High-rise and long-span steel frames
Tower, mast and wind-turbine flanges
Crane girders and heavy industrial connections
Inspection-critical and QA-audited projects
Retrofit and strengthening works

Standards, grades & finishes

Indicators to ASTM F959 / F959M (Type 325 and 490) and EN 14399-9 (HR / HV 8.8 / 10.9), hardened, with matching nut-face and bolt-face washers where required. Plain or mechanically galvanized (ASTM B695) / hot-dip; coated DTIs with squirter silicone available for one-sided visual inspection. Supplied with feeler gauges and installation guide; calibrated in accredited lab (ISO / IEC 17025) per lot.

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EPDM Bonded Sealing Washer

Tue, 26 Mar 2019 08:19:29 +0000

Bonded washers seal every roofing and cladding screw against rain and dust, and we stock them in Umm Al Quwain in 16, 19 and 22 mm diameters for 5.5 mm and 6.3 mm screws, with galvanized steel or stainless A2 caps and EPDM rubber vulcanised to the cap.

EPDM Bonded Sealing Washer explained

An EPDM bonded washer is a metal cup washer with an EPDM rubber seal permanently bonded to its underside. When the roofing screw is driven the rubber compresses and spreads slightly beyond the cap, sealing the screw hole while the metal cap prevents over-compression and UV degradation. EPDM keeps its elasticity from −40 °C to +120 °C and resists ozone and the Gulf sun for the life of the roof.

Applications

Metal roofing and wall cladding sheets
Sandwich panels and insulated roofs
Skylights, polycarbonate and ridge cappings
Gutters, flashings and trims
Solar mounting on metal roofs
Container, cabin and warehouse roofs

Standards, grades & finishes

Washers 16, 19, 22 and 25 mm outside diameter for 4.8 / 5.5 / 6.3 mm screws, cap in galvanized steel (Z275) or stainless A2 / A4, EPDM 3 mm bonded, 60–70 Shore A, temperature −40 to +120 °C. Supplied loose or pre-assembled on our self-drilling roofing screws. Colour-matched painted caps to order.

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