- Shank threaded into undercut area beyond bearing surface
- Available with smooth or serrated bearing surface
- Undercut washer head
- Sizes from M3 to M8 (#4 to 5/16")
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- Reduces strip-out
- Resists vibration loosening
- Allow use of thinner sheet metals for reduced costs
- Higher seating torques
- Excellent for grounding screw applications
- Achieves high clamp loads
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