Metric 18-8 Stainless Steel Internal Tooth Lock Washers (A2)
What are metric 18-8 stainless internal tooth lock washers? Metric 18-8 stainless internal tooth lock washers, grade A2, are metric star washers with inward-facing teeth. Made from corrosion-resistant 18-8 stainless, comparable to metric A2, the teeth bite the surface to resist loosening while the stainless grade resists rust.
How do I size metric internal tooth lock washers?
Metric internal tooth washers are sized to metric bolt diameters such as M4, M6, M8, and M10, so match the washer to your bolt's metric size. In 18-8 stainless, comparable to metric A2, they add corrosion resistance for outdoor and freshwater use, while the inward-facing teeth bite the surface and the underside of the bolt head to resist loosening. The smooth outer edge keeps a clean look for smaller-head fasteners and tight spaces. Pair with A2 metric hardware, and for coastal exposure choose a metric or 316 option. Tighten to the correct torque so the teeth seat.
Why choose metric 18-8 stainless internal tooth lock washers
- Metric sizing: matched to M-series bolt diameters.
- Corrosion resistant: 18-8 stainless (A2) resists rust outdoors.
- Clean look: inward teeth hidden under the bolt head.
- Grounding: teeth bite through coatings for metal-to-metal contact.
Common applications for metric 18-8 internal tooth lock washers
- Metric electrical grounding and bonding
- Smaller-head metric fasteners and tight spaces
- Imported electronics and control panels
- Metric machinery and equipment
For inch sizes, see 410 stainless internal tooth lock washers, and browse every material on the main lock washers category.
Metric 18-8 Stainless Internal Tooth 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 bolt size.
Why are internal tooth washers used for grounding?
The teeth bite through coatings and oxide to make solid metal-to-metal contact, which is why they are common at electrical ground points.