When do I use a thread forming or thread cutting screw?
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I have pontoon boat and I want to mount a fishfinder on my console. I believe the console is fiberglass that is about 1/8 inch thick. The fishfinder mount is a bracket with four holes in it to insert screws (no screws came with the bracket). The holes can take a #8 or #10 screw.
After a quick check of the hardware store, I see that I could use (a) machine screw with nut, (b) thread forming screw, or (c) thread cutting screw. The thread forming and thread cutting screws interested me. When do I use them?
Thread Cutting Screws cut machine screw threads and eject cutting chips as they are driven into material. Thread Cutting Screws have tapered threads and blunt points. Use in metals, plastics, and plywoods .048” to.625” thick. Requires predrilled or punched hole.
Thread Forming Screws form threads by displacing material rather than removing it as they are driven into material, minimizing cutting chips. Use in metals, plastics, and plywood .050” to .200” thick. Requires predrilled or punched hole.
Good Luck!
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2 Responses to “When do I use a thread forming or thread cutting screw?”
do not use thread forming or cutting screws in your application. why? the vibrations will make the fiberglass fray and the hole will become bigger and the screw will eventually fall out. ( and your fishfinder may find a fish the hard way….) Use a machine screw with a plain washer and a lockwasher or nyloc nut (nylon inserted in nut) will be your best most reliable mount. Besides if you decide to replace or remove your fishfinder it wont leave ugly scars in the buggered hole as if with a self tapping screw.
References :
Thread Cutting Screws cut machine screw threads and eject cutting chips as they are driven into material. Thread Cutting Screws have tapered threads and blunt points. Use in metals, plastics, and plywoods .048” to.625” thick. Requires predrilled or punched hole.
Thread Forming Screws form threads by displacing material rather than removing it as they are driven into material, minimizing cutting chips. Use in metals, plastics, and plywood .050” to .200” thick. Requires predrilled or punched hole.
Good Luck!
References :