CUPSCREW - (SCREW(Industrial fasteners)|Special Bearing Point):It has a flanged head with cup shape which has same function with spring loch washer. By making the flange in the shape of a cup, it
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8ga Screw Cups Nickel-Plated 200 Pack - Screwfix
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ForgeFix Screw Cup Washers | No. 6's | Solid Brass, Polished | Bag 200 : Amazon.co.uk: DIY & Tools
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8ga Surface Screw Cups Brass 100 Pack - Screwfix
Screw Cup Turned Pattern - Brass - For #10 (4.8mm) Screws | Shop4Fasteners
10g TURNED PATTERN SCREW CUPS
Number 10 Surface Screw Cups Solid Brass
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Brass Surface Screw Cups | Fixmart
BRASS SCREW CUPS BRASS SOCKET INSERTS MACHINED BRASS CUP WASHERS FOR CSK WOOD SCREWS