Square Washers & Plate Washers
Square and rectangular plate washers that spread load on timber and slotted holes.
Square washers for timber connections and slotted holes, where a round washer would either split the grain or spin. The bearing area is the reason they exist.
How we make it: Swiss CNC machining service →
2–4 weeks
1000 pieces
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Hole range | M6–M24 | metric |
| Plate sizes | 30×30 to 100×100 | mm |
| Thickness | 2–8 | mm |
| Hole position | ±0.3 | mm |
| Bearing area | Larger than round | note |
| Standard | DIN 434 / EN 14399 | - |
Available Materials
- Steel 8.8
- Hot-dip galvanised steel
- Stainless A2 / A4
- Mild steel
Typical Applications
- Timber framing
- Structural steel connections
- Slotted hole fixing
- Roof and cladding fixings
- Machine base plates
Surface Finishes
- Hot-dip galvanising
- Zinc plating
- Passivate
- Zinc flake
- Painted
Industries Served
- Warehousing
- Building Services
- Energy & Oil & Gas
- Rail
- Marine
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Tolerance
- Hole position at ±0.3 mm is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Thickness at 2–8 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Order size
- Minimum order is 1000 pieces, where setup and tooling are amortised across the batch and per-part cost settles around cycle time and material. Below that quantity the same part costs more per piece, not less.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
- Bore gauges and an optical comparator for hole position and edge form
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Why square rather than round on timber?
- Two reasons: a square washer resists rotating in the grain, and it has more bearing area for the same footprint. On a slotted plate hole, that rotation resistance is what keeps things aligned.
Related part families
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Flat, conical and shim washers from 0.05 mm, stamped or fine-blanked with lapped flatness.
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Hex bolts to DIN 931/933 in 8.8, 10.9 and stainless, rolled threads and full certs.
Anchor Bolts & Studs
Foundation anchor bolts with bent or plate ends, galvanised and supplied to length.