Sutton M2182858 1-1/8"-7 UNC Bottoming Hand Tap - Straight Flute, TCA

The Sutton M218 is a UNC (Unified National Coarse) bottoming hand tap in 13 sizes, #10 to 1-1/4", with a straight flute and a square shank, made from Tungsten Chrome Alloy (TCA) and sold singly. A bottoming tap offers a continuous cutting edge with almost no taper and is usually used to cut threads to the bottom of a blind hole.

The square shank is designed for hard threading work in a variety of materials. Carbon taps are not suitable for precision, safety or critical threads. They are for general purpose and DIY use only. The straight flutes are designed for tapping into materials where chips break up readily and present no disposal problems, particularly in through-hole tapping. Straight flute taps are only suitable for hand operations, tapping up to 1-1/2 x diameter.

Where this product is used

• Routine maintenance, repair work and re-threading where high accuracy and tolerance thread is not critical.
• Tapping through holes in materials where chips break up readily.
• Applications include DIY, trade, automotive, plumbing, metalworking and MRO work.

Design features

• Tungsten Chrome Alloy (TCA): carbon taps for general purpose use.
• Square shank: for hard threading work in a variety of materials.
• Straight flutes: suited to through-hole tapping.
• Lead: A bottoming tap offers a continuous cutting edge with almost no taper and is usually used to cut threads to the bottom of a blind hole.

Sizes and item numbers

Tap drill is the drill size to use before tapping.

Using the tap

• Drill the tap drill size shown in the size table for the thread you are cutting, then start the tap square to the hole.
• Turn the tap with a tap wrench on the square shank, backing off regularly to break the chip.
• Use a cutting fluid suited to the material being tapped.
• Use for hand tapping only, to a depth of up to 1-1/2 x the tap diameter.

Key specifications

Related products

Related Sutton taps: M216 UNC taper hand taps, M217 UNC intermediate hand taps and M222 UNF bottoming hand taps. Browse threading tools and threading dies and sets, or Tap Magic cutting fluids.