M4 Wave Washers (Curved Spring Washers) dimensions to DIN 137 B: inside diameter 4.3 mm, outside diameter 8 mm, thickness 0.3 mm, coarse thread pitch 0.7 mm.
- Inside diameter
- 4.3 mm
- Outside diameter
- 8 mm
- Thickness
- 0.3 mm
- Coarse thread pitch
- 0.7 mm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
M4 Wave Washers (Curved Spring Washers) are manufactured to DIN 137 B. This page lists the controlling dimensions for the M4 size together with the installation notes for this type.
Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.
M4 Dimensional Row (DIN 137 B)
| Thread size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Material thickness s (mm) | Free height h (mm) | Reference standard |
|---|
| M4 | 4.3 | 8 | 0.3 | 0.8 | DIN 137 B |
Mating Parts for M4
A M4 flat washer pairs with a M4 bolt/screw and matching M4 nut.
Custom manufacturing · Made to drawing
Need wave washers (curved spring washers) in a size this table does not list?
This page covers M4 wave washers (curved spring 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 M4 Wave Washers
What Wave Washers are specified for, industry by industry. Stocked from M3 to M24.
Industries that specify Wave Washers
-
Timber & construction
Large-diameter washers that stop pull-through in softer material.
-
Rotating & vibrating plant
Spring, tooth and wedge types that maintain or lock bolt tension.
-
Steel fabrication
Spreading load under a head or nut and protecting the surface finish.
-
Machine building & OEM
Setting bearing area on soft alloy, plastic and oversized holes.
Typical applications
- protecting a painted or plated surface under a turned nut
- maintaining bolt tension in a joint that settles
- spreading clamp load over a soft or oversized bearing face
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.
- 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.
Need help matching Wave Washers to your application? Send the assembly, the load and the environment with your enquiry and we will specify the size, material and finish against them.
