M3.5 External Tooth Lock Washers (DIN 6798 A): the row from the product table, what the nominal bolt size controls in the assembly, and the notes that matter when specifying this size.
M3.5 Dimensional Row (DIN 6798 A)
| Size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness s (mm) | Type | Reference standard |
|---|
| M3.5 | 3.7 | 7 | 0.5 | External teeth | DIN 6798 A |
Mating Parts for M3.5
A M3.5 flat washer pairs with a M3.5 bolt/screw and matching M3.5 nut.
Custom manufacturing · Made to drawing
Need external tooth lock washers in a size this table does not list?
This page covers M3.5 external tooth lock washers. Bore, outside diameter, thickness, temper and finish are the variables here — there is no thread to specify, so the fit and the bearing area are what the drawing has to pin down. Made by stamping or punching.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom washer manufacturingSend a drawing
Applications & Industries for M3.5 External Tooth Lock Washers
What External Tooth Lock Washers are specified for, industry by industry. Stocked from M2 to M30 (nominal bolt size).
Industries that specify External Tooth Lock Washers
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Timber & construction
Large-diameter washers that stop pull-through in softer material.
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Rotating & vibrating plant
Spring, tooth and wedge types that maintain or lock bolt tension.
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Steel fabrication
Spreading load under a head or nut and protecting the surface finish.
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Machine building & OEM
Setting bearing area on soft alloy, plastic and oversized holes.
Typical applications
- spreading clamp load over a soft or oversized bearing face
- protecting a painted or plated surface under a turned nut
- maintaining bolt tension in a joint that settles
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- Vibration
- Specified where cyclic load would loosen a plain nut or screw — rotating plant, rail, mobile equipment and anything that is not re-torqued in service.
- Hardness matters
- Under a high-strength bolt a soft washer embeds into the joint and preload is lost — specify a hardened washer for structural bolting.
Full application guide: where External Tooth Lock Washers are used, how to specify them, and the cases they are wrong for
