Reference illustration — produced to your drawing
Washers
Bonded Sealing Washers
A bonded sealing washer is a metal washer with an elastomer ring bonded to its inner diameter, so tightening the bolt compresses the ring and seals the joint. It seals both under the head and around the thread.
Used to seal oil, fuel, hydraulic and air fittings against leaks without a gasket. Bought by hydraulic, pneumatic and engine-assembly buyers.
Standard
To your drawing
Size range
M4 – M33 · #8 – 1-1/4 in
MOQ
From 50 pcs
Lead time
Samples 5–10 days
What we produce
- Carbon steel 1045 or stainless steel 304 washer
- Bonded sealing ring on the inner diameter
- Seals under the bolt head and around the thread
- Plain, zinc-plated or passivated finish
- Suits metric and inch bolt sizes
Specification notes
- Washer diameter, thickness and seal profile per drawing
- Minimum order quantity starts from 50 pieces
Specifications
Every line below is a starting point, not a limit. Non-standard sizes, special threads and unusual materials are what we do — send the drawing and we confirm what fits.
| Size range | M4 – M33 · #8 – 1-1/4 in |
|---|---|
| Threads | Not applicable |
| Head / geometry | Flat metal washer with a bonded elastomer sealing ring on the inner diameter |
| Materials | Stainless steel 301 / 303 / 304 / 304L / 316 / 316L / 410 / 416 / 17-4PH · carbon steel 1045 / 1215 / 12L14 · alloy steel 4130 / 4140 · aluminium 2024 / 5052 / 6061 / 7075 · brass · bronze · copper · titanium |
| Finishes | As machined · black oxide · zinc plating · nickel plating · chrome plating · anodizing · passivation (through our vetted partner network) |
| Precision | ±0.01 mm on features that locate, seal or fit; ISO 2768-m for general dimensions |
| Marking | Head marking, grade marking or your own identification mark per drawing |
| Documents | Material certificate (MTR) with every batch, plus pre-shipment photos before dispatch |
| MOQ | From 50 pieces per type and material · samples from 1 piece |
| Sample lead time | 5–10 days |
| Production lead time | 25–35 days after sample approval |
| Quote | Within 24 hours, with DFM feedback |
Other washers we manufacture
See all 179 part types →
Send us the drawing
We reply within 24 hours with DFM feedback, a process route and a price. Samples from 1 piece, production from 50 pieces, shipped from Qidong City, Jiangsu Province, China.
Request a quote