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SCREWS > Sems > Hex Head Hex Head External Sems Machine Screw, Zinc Plated Machine Screws with Lock Washers Sems are machine screws with free-turning captive lock washers--external tooth and internal tooth lock washers are common. The screw/washer assembly saves time when compared to using individual screws and washers. Internal Sems, which have an internal tooth lock washer, are preferred when it is desirable to hide the teeth. The larger radius of an External Sems, though, provides greater locking action. Length is measured from under the head. Total Pages: 1 Code   Product   Each   Package   No. of Pkgs SC172-5533   6-32 x 1/4"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.14   $13.38     SC172-6533   6-32 x 3/8"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.14   $13.89     SC172-7533   6-32 x 1/2"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.15   $14.93     SC172-0533   8-32 x 3/8"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.16   $15.96     SC172-1533   8-32 x 1/2"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.17   $16.47     SC162-5523   10-24 x 1/2"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.20   $19.05     SC162-6523   10-24 x 5/8"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.22   $21.62     SC162-8513   10-32 x 1/4"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.19   $18.02     SC162-9513   10-32 x 5/16"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.20   $19.05     SC162-0513   10-32 x 3/8"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.19   $18.02     SC162-1513   10-32 x 1/2"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.20   $19.05     SC162-8523   1/4-20 x 3/8"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.21   $20.07     SC162-9523   1/4-20 x 1/2"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.23   $22.65     SC162-0523   1/4-20 x 5/8"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.25   $24.20     SC162-1523   1/4-20 x 3/4"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.26   $25.22     SC162-2523   1/4-20 x 1"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.33   $32.93     SC162-3523   1/4-20 x 1 1/4"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.44   $43.24     SC172-4533   1/4-20 x 1 1/2"  Hex Head External Sems Machine Screw, Zinc Plated, 100 pcs   0.49   $48.37

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