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