ASME B18.21.1 Helical spring-lock, tooth lock and plain washers (inch)
CurrentLatest edition found. Still confirm amendments with the publisher.
- Edition
- ASME B18.21.1-2009 (R2016)
- Publisher
- ASME
- Part family
- Fasteners & threads
- Reviewed
- 27 October 2026 · source checked
Is ASME B18.21.1 still current?
Yes. ASME B18.21.1-2009 (R2016) is the latest edition MechAtlas found (MechAtlas review: 27 October 2026). Check the publisher for amendments before you specify it.
What it covers
Inch lock washers and plain washers.
Parts that use ASME B18.21.1
- Flat washer (USA (ASME / ASTM), main)
Thin flat ring placed under a nut or bolt head to spread load and protect the surface.
Inch plain, spring-lock and tooth-lock washers. - Spring lock washer (USA (ASME / ASTM), main)
Split, twisted ring of spring steel put under a nut or screw head, used in older designs to resist loosening.
Inch helical spring-lock and tooth-lock washers.
Official source
MechAtlas does not reproduce standards. Check the official edition at the publisher's page for ASME B18.21.1 or the ASME store.
Open in MechAtlasCheck a drawing callout
Other fasteners & threads standards
- DIN 125-1 Replaced
Washers, product grade A, up to 250 HV - DIN 1481 Replaced
Heavy spring pins (old) - DIN 2999-1 Replaced
Whitworth pipe threads (old) - DIN 6325 Replaced
Hardened parallel pins m6 (old) - DIN 6914 Replaced
HV hex bolts for steel structures (old) - DIN 7 Replaced
Parallel pins (old) - DIN 7337 Replaced
Break mandrel blind rivets (old) - DIN 7991 Replaced
Hexagon socket countersunk head screws - DIN 9021 Replaced
Washers, outside diameter about 3 x thread - DIN 912 Replaced
Hexagon socket head cap screws (ISO 4762 modified) - DIN 913 Replaced
Hexagon socket set screws, flat point (ISO 4026 modified) - DIN 916 Replaced
Hexagon socket set screws, cup point (ISO 4029 modified)