Metric 18-8 Stainless Steel High Collar Split Ring Lock Washers (A2)
What are metric 18-8 stainless high collar lock washers? Metric 18-8 stainless high collar lock washers, grade A2, are narrow, thick metric helical spring washers made for socket head cap screws. In corrosion-resistant 18-8 stainless, comparable to metric A2, the smaller outer diameter fits under socket cap heads and in counterbored holes while resisting rust.
How do I size metric high collar lock washers?
Metric high collar washers are sized to metric socket cap screw diameters such as M4, M6, M8, and M10, so match the washer to your screw's metric size. In 18-8 stainless, comparable to metric A2, they add corrosion resistance for outdoor and freshwater use, while the reduced outer diameter fits under socket cap heads and in counterbored holes and the extra thickness keeps the locking force. Pair with A2 metric socket cap screws. For coastal or saltwater exposure, step up to a metric A4 lock washer where available. Tighten to the correct torque to activate the spring action.
Why choose metric 18-8 stainless high collar split ring lock washers
- Metric sizing: matched to M-series socket cap screws.
- Fits socket cap screws: smaller OD for counterbored holes.
- Corrosion resistant: 18-8 stainless (A2) resists rust outdoors.
- Vibration locking: thick split ring bites the surface to resist loosening.
Common applications for metric 18-8 high collar lock washers
- Metric socket head cap screw assemblies
- Counterbored holes and tight clearances
- Imported machinery and equipment
- Outdoor and freshwater metric work
For inch sizes, see 304 stainless high collar split ring lock washers, and browse every material on the main lock washers category.
Metric 18-8 Stainless High Collar Split Ring Lock Washers FAQ
Is A2 the same as 18-8 stainless?
A2 is the metric designation comparable to 18-8 and 304 stainless, with similar corrosion resistance.
What metric sizes are available?
Common metric diameters such as M4, M6, M8, and M10. Match the washer to your metric socket cap screw.
Why use a high collar washer with a socket cap screw?
Its smaller outer diameter fits under the narrow head of a socket head cap screw and into a counterbored hole, where a standard washer would be too wide.