Three-Stage RH Imperial HSS Tap 3/8-20 BSF Fine Thread Pilot Pin 6.34X102mm This Insize long-base digital depth

This Insize long-base digital depth gauge is engineered for precise measurement of bores

Dimensions:

Overall Length (Excluding Shank): 64mm

Part No: ISR-CS321

Aluminium Mechanical Test Plug

Three-Stage RH Imperial HSS Tap 3/8-20 BSF Fine Thread Pilot Pin 6.34X102mm This Insize long-base digital depthPlease note this is a British Standard 3 8x20 Fine thread, or BSF. This form of tap is ideal for tougher materials as the thread is formed in three stages as opposed to NON serial taps which form the thread in one pass. Specifications Material: HSS (High Speed Steel) BOTTOM TAPS have a chamfer (lead) of 12 threads, the angle of the lead being around 18 degrees per side. They are used to produce threads close to the bottom of blind holes. SECOND TAPS