ISO 7089 vs 7090 vs 7093 — which washer should I choose?

ISO 7089 is the standard flat washer (Form A), ISO 7090 is chamfered (Form B) for hardened surfaces, and ISO 7093 is a large-OD washer for thin or soft materials. ISO 7094 is an extra-large series.

Do spring/tooth washers stop loosening?

They increase friction and bite under vibration. For critical joints, consider tooth or wedge-lock systems and correct clamp load with matching nut/bolt classes.

When should I use wave washers?

Wave (DIN 137) washers provide elastic preload and take up tolerance in light mechanical and electrical assemblies, maintaining contact pressure over cycles.

Which washer finish is best outdoors?

Use Hot-Dip Galvanised (HDG) or Aluminium-Zinc flake for strong corrosion protection; choose stainless A4 in marine/chemical environments.

Washers

Plain Washer

Spring Washer

Internal Tooth Lock Washer

External Tooth Lock Washer

Wave Washer

Industrial Washers — ISO/DIN/IS Standards, Materials & Applications

Shop plain (flat), spring (split-lock), internal tooth, external tooth and wave washers for clamping, load-spread and vibration resistance. Metric sizes typically M3–M48 with finishes including zinc (clear/yellow/black), black oxide, HDG and Al-Zn flake; stainless A2/A4 available. Pair with Hex/Flange Bolts and Hex/Lock Nuts for complete assemblies.

Key Standards

Plain (flat): ISO 7089 (Form A), ISO 7090 (Form B chamfered), ISO 7091 (narrow), ISO 7093 (large), ISO 7094 (large series)
Spring (split-lock): DIN 127 / DIN 7980 (series)
Tooth lock: DIN 6797 (internal/external)
Wave / curved spring: DIN 137 A/B
Related: Disc/Belleville (DIN 2093), wedge-lock sets (per anti-loosening principles)

Materials / Finishes

Carbon & alloy steel, stainless A2/A4
Zinc (clear/yellow/black), Black Oxide, HDG, Al-Zn flake
Brass/Phosphor Bronze (on RFQ); nylon for insulation

Selection Tips

Use ISO 7093/7094 for thin/soft materials (larger OD)
Spring/tooth types for vibration; verify surface hardness
Wave for preload/compensation in assemblies

Browse Washers by Type

Plain (Flat) Washers

General load-spreading and surface protection. Common specs: ISO 7089/7090 (normal), ISO 7091 (narrow), ISO 7093 (large OD), ISO 7094 (extra-large series). Ideal under hex heads and nuts.

Spring (Split-Lock) Washers

Helps resist loosening from vibration/thermal cycling. References DIN 127 / DIN 7980. Use on hard bearing surfaces; for critical joints consider tooth or wedge-lock solutions.

Internal Tooth Lock Washers

Teeth bite around the bore for hidden, centered locking—great under screw heads. Standard DIN 6797 (Type I). Best on harder finishes; avoid soft plastics unless specified.

External Tooth Lock Washers

Teeth at the OD maximize bite and friction under nuts/bolt heads. Standard DIN 6797 (Type A). Suited to large bearing faces and painted/oxide-free surfaces.

Wave Washers

Provide elastic preload and compensate for tolerance stack-ups. Curved/wave per DIN 137 A/B. Common in bearings, electronics, and light mechanical assemblies.

Applications

Structural steel & fabrication, OEM machinery, electrical & electronics, HVAC & cladding, automotive, marine and fixtures. Use ISO 7093/7094 on soft/thin substrates, spring/tooth for vibration, and wave to preload or take up clearance. Prefer stainless A4 or HDG/Al-Zn flake in aggressive environments.

Dimensional & hardness checks; MTCs on request
Bulk/contract pricing, RFQ support & GST invoicing
Fast pan-India dispatch; export packing available

Request a Quote / Bulk Pricing or WhatsApp: +91-9611591173

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