Machine, Sheet Metal, and Thread Cutting/Thread Forming/Thread Rolling Screws Technical Information
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Categories
Categories |
Type |
Use/Application |
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Machine Screws |
Used with a nut or tapped hole in a wide variety of general applications. |
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Tapping Screws |
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Type A-Self Tapping |
For use in metal .015 to .050 thick. Used with drilled, punched or nested holes in sheet metal, resin impregnated plywood, asbestos combinations, among others. |
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Type AB-Self Tapping |
A tapping screw combining point of Type A with fine thread pitch of Type B. |
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Type B-Self Tapping |
A tapping screw for use in metal .050 to .200 thick. Larger root diameter with finer thread pitch for light and heavy sheet metal non-ferrous castings, plastics, impregnated plywoods, asbestos combinations, and other materials. |
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Type 25-Thread Cutting |
A thread cutting screw similar to Type 23 point except with Type B thread. For plastics and other soft materials with large chip clearing and cutting edges. |
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Type 23-Thread Cutting |
A thread cutting screw in the fine thread series offering maximum thread cutting area and excellent chip clearing, with minimum tightening torques. |
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Type F-Thread Cutting |
A thread cutting screw with machine screw thread with blunt tapered point, have multi-cutting edges and chip cavities. For heavy gauge sheet metal, aluminum, zinc, and lead die castings, cast iron, brass and plastic. |
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Construction |
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Used to attach drywall to wood or metal studs. |
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Decking Screws |
Coarse threaded screws with an extra sharp point for use in deck building. |
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Self-drilling screws have “Drill-Bit Points” for applications that are not pre-drilled. Also known as TEK Screws. |
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Self-Piercing Screws |
Self-Piercing Screws are tapping screws with an extra sharp point that eliminates the need for pre-drilled holes in thin metal. |
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Hardness Technical Data
Description |
(S) Surface / (C) Case Hardness |
Core Hardness (After Tempering) |
Material |
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Tapping Type A/AB/B |
(S)Rockwell C45 min |
Rockwell C28-38 |
AISI 1016-1024 or Equivalent Steel |
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Self Tapping Hi-Lo |
(C)Rockwell C45 min |
Rockwell C28-36 |
AISI 1019-1022 or Equivalent Steel |
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Thread Cutting Type 25/23/F |
(S)Rockwell C45 min |
Rockwell C28-38 |
AISI 1016-1024 or Equivalent Steel |
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Type F Torx Floorboard Screws |
(S)Rockwell C45 min |
Rockwell C28-38 |
AISI 1016-1024 or Equivalent Steel |
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Tri-Lobular Thread Rolling |
(C)Rockwell C45 min |
Rockwell C28-38 |
AISI 1016-1024 or Equivalent Steel |
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Self Piercing Screws |
(S)Rockwell C45 min |
Rockwell C28-38 |
AISI 1018-1022 or Equivalent Steel |
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Self Drilling Screws |
(C)Rockwell C52-58 |
Rockwell C32-40 |
AISI 1016-1024 or Equivalent Steel |