Sutton T905 1/2 x 12 TPI Straight Flute Tap Set - HSS - Bright - ISO 529

The Sutton T905 is a three-piece straight flute tap set (N designation) for BSW threads, made from high speed steel (HSS) with a bright finish. This listing covers 15 sizes from 3/32 x 48 TPI to 1 x 8 TPI.

Each set contains three taps in the same thread size: a taper tap, an intermediate tap and a bottoming tap. Straight flutes suit through or blind holes, but they hold only a small amount of chips and do not transport them axially, so deep holes are best avoided except in short chipping materials. The N designation is for normal, general purpose materials, with a normal rake angle and normal thread relief. The taper tap has a Form A chamfer (6 to 8 threads on the lead), for short through holes. The intermediate tap has a Form D chamfer (3.5 to 5 threads on the lead), generally for through holes. The bottoming tap has a Form E chamfer (1.5 to 2 threads on the lead), for blind holes with very short thread run-out.

The thread tolerance is Z3 Medium. The set is built to ISO 529.

Where this product is used

• General purpose use.
• Suitable for materials up to 1000 N/mm2.
• Through & blind holes.
• Suitable for both hand and machine operations.
• Depths up to approx. 1 x d1.

Design features

• High speed steel (HSS). Standard tool material for most common applications.
• Bright finish for general purpose applications.
• 3 to 4 flutes, depending on size.
• Three taps per set: taper (Form A chamfer), intermediate (Form D) and bottoming (Form E).
• Thread tolerance Z3 Medium.
• The N designation is for normal, general purpose materials, with a normal rake angle and normal thread relief.
• ISO 529 construction.

Sizes

Dimensions are in millimetres. Item numbers are the Sutton catalogue numbers. If you are not sure which tapping drill to use, try our tap drill size selector.

Key specifications