Goliath Threading Tools 1/2″ x 12 BSW Fluteless HSS-Co5 Tap – Goliath

Description

1/2″ x 12 BSW Fluteless HSS-Co5 Tap – Goliath
HSS-Co (Cobalt) Bright Finish BSW Fluteless Machine Tap.
HSS Fluteless (Roll Form) Taps.
Fluteless taps are also referred to as “Roll Form” or “Thread Flow” taps.
Unlike standard taps, fluteless taps create internal threads by pressure deformation, rather than by material removal.
As a result, no chips are formed as no material is removed.
The thread is formed by the tap in the ductile material creating threads that have a smoother surface and greater tensile strength under dynamic stress than cut threads.
It is essential to use a high quality lubricating fluid when using fluteless taps.
Materials with a minimum elongation of 5% and a tensile strength no greater than 1,000 N/mm2 are suitable for thread forming.
British Standard Whitworth angle of thread is 55 degrees as opposed to 60 degrees in Metric and Unified threads.
This thread form was developed by Sir Joseph Whitworth in 1841.
The thread form has rounded roots and crests and is specified in BS84:1956.
Manufactured from HSS this fluteless tap is designed for use in medium tensile materials and is for hand or general machine use.
IMPORTANT – Fluteless Taps use different tapping drill sizes than standard taps.
Category: Goliath Threading Tools, Taps Hand & Machine, HSS-Co5 Fluteless Taps, BSW
Drill Diameter (mm): 11.6
Overall Length (mm): 89
Pitch (tpi): 12