3" x 8 NPT HSS Tap Set - Goliath

About this item:

• 3" x 8 NPT HSS Tap Set - Goliath
• HSS Bright Finish NPT Hand and Machine Tap Set.
• Pipe taps are much shorter than a similar size of regular hand tap, but the design features are the same.
• Goliath HSS taps provide a high hardness to toughness ratio, compressive and tensile strength, good abrasion resistance and resistance to micro-chipping, ensuring a long tool life.
• Tapered Pipe Taps are used for tapered threading by hand or machine.
• National Pipe Tapered (NPT)is a US standard for tapered threads used to join pipes and fittings.
• ANSI/ASME standard B1.20.1 covers threads of 60º form with flat crests and roots.
• The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other.
• However a clearance remains between the crests and roots of the threads, resulting in a leakage around this spiral.
• This means that NPT fittings must be made leak free with the aid of thread seal tape or a thread sealant compound.
• For each 12" increase in distance from the end, the diameter increases by 3/4".
• Taper Taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes.
• Intermediate Taps have a lead of four threads and are used in most general purpose applications to cut a thread true to a pre-drilled pilot hole.
• Bottoming Taps have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole.
• Bottoming Taps are typically preceded by the use of a Taper or Intermediate Tap.
• Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.