This page covers M30 Spherical Washers & Conical Seats to DIN 6319. M30 is the nominal bolt size; the dimensional row below is reproduced from the product table, followed by the tolerance, material and selection notes that apply to this size.
M30 Dimensional Row (DIN 6319)
| Bolt size | Bore d1 (mm) | Outer diameter d2 (mm) | Height h Form C (mm) | Thickness s (mm) | Conical seat height Form D (mm) | Spherical radius R (mm) | Max misalignment | Reference standard |
|---|
| M30 | 31 | 56 | 12 | 12 | 10 | 40 | 3 deg | DIN 6319 C/D |
Mating Parts for M30
A M30 flat washer pairs with a M30 bolt/screw and matching M30 nut.
Custom manufacturing · Made to drawing
Need spherical washers & conical seats in a size this table does not list?
This page covers M30 spherical washers & conical seats. 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 M30 Spherical Washers & Conical Seats
What Spherical Washers & Conical Seats are specified for, industry by industry. Stocked from M5 to M30 (nominal bolt size).
Industries that specify Spherical Washers & Conical Seats
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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
- maintaining bolt tension in a joint that settles
- spreading clamp load over a soft or oversized bearing face
- protecting a painted or plated surface under a turned nut
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.
Full application guide: where Spherical Washers & Conical Seats are used, how to specify them, and the cases they are wrong for
