DIN 440 Form R Washers
M5 - M33
Steel zinc platedA2 stainless steelA4 stainless steel
DIN 440 covers large-diameter washers for timber and heavy construction; form R has a round hole. We supply DIN 440R washers across a range of metric sizes.
Also known as: timber washers, round hole washers, form R washers.
DIN 440 dimensions
| Bolt Size | Inside Diameter | Outside Diameter | Thickness |
|---|---|---|---|
| M5 | 5.5mm | 18mm | 2mm |
| M6 | 6.6mm | 22mm | 2mm |
| M8 | 9mm | 28mm | 3mm |
| M10 | 11mm | 34mm | 3mm |
| M12 | 13.5mm | 44mm | 4mm |
| M14 | 15.5mm | 50mm | 4mm |
| M16 | 17.5mm | 56mm | 5mm |
| M20 | 22mm | 72mm | 6mm |
| M22 | 24mm | 80mm | 6mm |
| M24 | 26mm | 85mm | 6mm |
| M27 | 30mm | 98mm | 6mm |
| M30 | 33mm | 105mm | 6mm |
| M33 | 36mm | 112mm | 6mm |
Materials & strength
Heavy timber pattern
Large diameter and thick section spread load on timber and soft materials.
Frequently asked
What is a DIN 440 washer used for?
DIN 440 washers have a large outside diameter and thick section for timber construction and heavy fixings, spreading bolt load across soft material. Form R is the round-hole pattern; form V has a square hole for coach bolt necks.
Need DIN 440 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.