Metric cap nuts, also called acorn nuts, are blind tapped hex nuts with acorn-shaped tops. Cap nuts feature a crown, or dome, covering. They are chosen for safety reasons, to cover protruding threaded mating parts and for decorative enhancement.
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METRIC CLASS 6 HEX DOMED ACORN NUT, DIN 1587, ZINC CR+3

M4-0.70 METRIC CAP NUT (DIN 1587) ZINC
Web Price $281.53
METRIC CLASS 6 HEX DOMED ACORN NUT, DIN 1587, ZINC CR+3

M4-0.70 METRIC CAP NUT (DIN 1587) ZINC
Web Price $80.33
METRIC CLASS 6 HEX DOMED ACORN NUT, DIN 1587, ZINC CR+3

M5-0.80 METRIC CAP NUT (DIN 1587) ZINC
Web Price $228.48
METRIC CLASS 6 HEX DOMED ACORN NUT, DIN 1587, ZINC CR+3

M6-1.00 METRIC CAP NUT (DIN 1587) ZINC
Web Price $214.83
METRIC CLASS 6 HEX DOMED ACORN NUT, DIN 1587, ZINC CR+3

M6-1.00 METRIC CAP NUT (DIN 1587) ZINC
Web Price $30.61
Diameter N/A M4 N/A M4 N/A M5 N/A M6 N/A M6
Pitch N/A Coarse
Length N/A
Material N/A Carbon Steel
Finish N/A Zinc Plated
Package Quantity N/A 5000 N/A 1000 N/A 4000 N/A 2000 N/A 200