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Self-Tapping Screw Type A |
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Description |
A thread forming tapping screw with wider spaced threads than a Type-AB and a gimlet point |
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Applications / Advantages |
For self starting in thin (.015-.050 thick ) metal or resign-filled plywood.18-8 Stainless steel tapping screw may be used in applications which require general atmospheric corrosion resistance. Fastening stainless steel parts to aluminum or steel can cause a type of corrosion known as a galvanic couple in some environments. |
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Material |
Steel:
AISI 1016 - 1024 or equivalent steel
Stainless: Austenitic 18-8 stainless steel |
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Self-Tapping Screw Type AB |
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Description |
A thread forming screw with spaced threads and a gimlet point |
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Applications / Advantages |
For self starting in thin metal or resign-filled plywood. Recommended over a Type-A, particularly in brittle materials. |
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Material |
AISI 1016 - 1024 or equivalent steel |
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Self-Tapping Screw Type B |
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Description |
A thread forming tapping screw with spaced threads and a blunt point with incomplete entering |
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Applications / Advantages |
For molded or through holes in thin metal, non-ferrous castings, plastics or resin filled plywood. |
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Material |
AISI 1016 - 1024 or equivalent steel |
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Self-Tapping Screw Type F |
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Description |
A thread cutting screw with machine screw thread pitch, blunt point, tapered entering threads and multiple cutting edge |
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Applications / Advantages |
For use in heavy gauge sheet metal, aluminum, zinc and lead die casting, cast iron, brass and plastic. |
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Material |
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Self-Tapping Screw Type 25 |
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Description |
A thread cutting screw with spaced threads, a blunt
point, tapered entering threads, |
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Applications / Advantages |
For molded or through holes in plastics and other soft materials. Provides excellent chip clearing capability |
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Material |
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Drive Screws - Round Head Type U |
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Description |
Round head metallic drive screw having multiple start threads of large helix angle, with a pivot. |
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Applications / Advantages |
For making permanent fastenings in metals and plastics, when forced into the work under pressure. |
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Material |
AISI 1016 - 1024 or equivalent steel |
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Self-Drilling Tapping Screws |
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Description |
Type
BSD: A tapping
screw with spaced threads and a drill point which dills its own hole.
Type CSD: A wafer head thread forming screw with machine screw thread pitch and a drill point which drills its own hole.Both types allow the screw to form mating threads and produce a complete fastening system in a single operation. |
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Applications / Advantages |
Type BSD: May be used to attach plywood, soft woods or composition board to metal, or attach metal to metal.Type CSD: The finer thread pitch reduces friction and driving torques. Type-CSD screws are normally used with thicker materials. The wafer head design allows the screw to set flush in the wood and softer materials and provides a clean, finished appearance. All self-drilling screws offer economical benefits: reduces labor and tooling costs; reduces or eliminates drill bits and taps. |
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Material |
AISI 1016 - 1024 or equivalent steel |
