The primary duty of EPDM Sealing Washers is load distribution and anti-loosening under a bolt or nut. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly M6 to M14, they cover general to heavy-duty work.
Typical Applications for EPDM Sealing Washers
The most common settings where these are specified:
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Bolted structural joints: spreading load over soft or oversized holes and protecting the surface.
- Vibration applications: spring and serrated types that maintain tension under cyclic load.
- Timber & soft materials: large-OD types that prevent pull-through.
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
How to Specify EPDM Sealing Washers for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M6–M14; check the full table below for the exact dimensions of each size.
- Type & OD: Select flat for load spreading, spring/serrated for anti-loosening, or fender/large-OD for soft or oversized holes.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This is a trade-series article rather than one covered by a published dimensional standard, so dimensions can differ between manufacturers. Quote the dimensions you need — or the part you are replacing — rather than a standard number.
Installation & Assembly Practice
- Place the washer under the rotating element (usually the nut) so tightening does not score the surface.
- Chamfered-hole side of a hardened washer faces the bolt head fillet.
- On serrated-flange hardware, do not add a plain washer — it defeats the serrations.
Common Selection Mistakes with EPDM Sealing Washers
- Relying on a spring washer for locking on class 8.8+ joints — at high preload it flattens and adds nothing.
- Choosing an OD too small for soft material, so the head pulls through or embeds.
Where EPDM Sealing Washers Are Not the Right Choice
A washer does not replace a locking feature on its own in severe vibration, and a spring washer adds little clamp on high-strength joints.
Custom manufacturing · Made to drawing
Need a EPDM sealing washers outside the standard range?
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.
