Thread Forming Screws

Last Updated: 06/01/2012
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Thread Forming Screws
There are various methods used in the production of creating threads, one of these is known as thread forming. As opposed to thread rolling which creates a thread on the external diameter of a bar, the forming of a thread takes place on the interior of a bar, i.e. a hole or bore. Thread forming is performed by using a roll tap or fluteless tap. These taps closely resemble cutting taps but have no flutes and as such do not cut. The thread is formed by usually three lobes which are spaced equally around the taps diameter. It must be said that the hole size for thread forming is different from the hole size drilled when using a cutting tap. The hole is drilled larger because a slightly undersize hole will cause the tap to break due to the high pressure of the forming process. Correct whole sizing is extremely important, and the use of a chart or tables should be employed. Lubrication of the operation is also important because of the frictional forces involved; therefore lubricating oil is used instead of coolant or cutting fluid. The production rates are normally three to five times faster than thread cutting.
Avon Stainless Fasteners Ltd
Unit 10, Riverside Business Park, St. Anne's , Bristol, BS4 4ED
  • Known for our expertise
  • A wide range of items
  • Can source items not on website
  • Willing to help
  • Our service is not just for standard items
63
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A+D Fasteners
Unit 16, Teignbridge Business Centre, Cavalier Road, Heathfield Indust...
  • Aim to despatch all orders within 24 hours
  • Web based mail order facility
  • Thread Forming Screws
  • Friendly sales team
  • Always try to sort items if not stocked
46
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L.D. Leigh & Co Ltd
P.O Box 670, Chesterfield, Derbyshire, S40 1AA
  • 30+ years experience.
  • Excellent transport links enable speedy delivery.
  • Tailored to requirements.
  • Competitive prices
  • Services are intended to be cost effective.
61
other products
Alternative Suppliers
Alston Engineers (Preston) Ltd 108 Holme Slack Lane, Preston, PR1 6HA
DC Swiss UK Limited Unit 1, 233 Handsworth Road, Sheffield, South Yorkshire, S13 9BL
Micro Fastenings Ltd 44 Kitsmead, Copthorne, Crawley, East Sussex, RH10 3PW
PSM International Limited 14 Barton Industrial Estate, Etruria Way, Mount Pleasant, Bilston, Wolverhampton, West Midlands, WV14 7LH
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