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Aspen Fasteners
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Sems Screws - External Tooth Sems
Hex Indented Unslotted Hex Indented Washer Phillips Drive
Sems Screws - External Tooth Sems - Hex Indented Unslotted
Sems Screws - External Tooth Sems - Hex Indented Washer Phillips Drive
Hex Slotted Hex Slotted Washer
Sems Screws - External Tooth Sems - Hex Slotted
Sems Screws - External Tooth Sems - Hex Slotted Washer
Hex Washer Pan 6-Lobe Drive
Sems Screws - External Tooth Sems - Hex Washer
Sems Screws - External Tooth Sems - Pan 6-Lobe Drive
Pan Head Phillips/Slot Combo Drive Pan Phillips Drive
Sems Screws - External Tooth Sems - Pan Head Phillips/Slot Combo Drive
Sems Screws - External Tooth Sems - Pan Phillips Drive
Pan Slot Drive
Sems Screws - External Tooth Sems - Pan Slot Drive

Advantages of External Tooth Sems Screws

  • Generates and maintains tension
  • Absorbs torque and prevents slipping
  • Opposes loosening rotation of the screw
  • Absorbs shock and vibration
  • Ideal for larger head screws (round, pan, binding, etc.)
  • When exposed/visible teeth are not a concern
  • Maximizes torsional resistance due to larger radius
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