Sutton T178 G 1 x 11 TPI Spiral Point Tap - HSSE - Bright - DIN 5156
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The Sutton T178 is a spiral point (gun) tap (N designation) for BSPF (G) threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 8 sizes from G 1/8 x 28 TPI to G 1 x 11 TPI.
The gun (spiral point) nose curls the chip forward, ahead of the tap and out of the hole, so chip clogging is avoided and coolant can flow without problems. It suits through holes. The N designation is for normal, general purpose materials, with a normal rake angle and normal thread relief. The chamfer is Form B (4.5 x P), for through holes in medium and long chipping materials.
The thread standard is ISO 228. The tap is built to DIN 5156: reduced shank with square drive.
Where this product is used
- General Purpose use in materials up to approx. 1000 N/mm2.
- Through holes.
- Suitable for machine operations.
- Depths up to approx. 3 x d1.
Design features
- Premium grade high speed steel (HSSE). The vanadium grade gives high wear resistance and toughness for most tapping applications.
- Bright finish for general purpose applications.
- 3 to 4 flutes, depending on size.
- Form B chamfer, 4.5 x P.
- Thread standard ISO 228.
- The N designation is for normal, general purpose materials, with a normal rake angle and normal thread relief.
- DIN 5156 construction, reduced shank with square drive.
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.
| Item no. | Thread size | TPI | Tapping drill (mm) | l1 overall (mm) | l2 thread (mm) | d2 shank (mm) | sq square (mm) | l4 square length (mm) | Flutes |
|---|---|---|---|---|---|---|---|---|---|
| T178 0973 | G 1/8 x 28 TPI | 28 | 8.8 | 90 | 20 | 7 | 5.5 | 8 | 3 |
| T178 1316 | G 1/4 x 19 TPI | 19 | 11.8 | 100 | 22 | 11 | 9 | 12 | 3 |
| T178 1666 | G 3/8 x 19 TPI | 19 | 15.3 | 100 | 22 | 12 | 9 | 12 | 3 |
| T178 2096 | G 1/2 x 14 TPI | 14 | 19 | 125 | 25 | 16 | 12 | 15 | 3 |
| T178 2291 | G 5/8 x 14 TPI | 14 | 21 | 125 | 25 | 18 | 14.5 | 17 | 4 |
| T178 2644 | G 3/4 x 14 TPI | 14 | 24.5 | 140 | 28 | 20 | 16 | 19 | 4 |
| T178 3020 | G 7/8 x 14 TPI | 14 | 28.5 | 150 | 28 | 22 | 18 | 21 | 4 |
| T178 3325 | G 1 x 11 TPI | 11 | 31 | 160 | 30 | 25 | 20 | 23 | 4 |
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | T178 |
| Type | Spiral point (gun) tap |
| Thread series | BSPF (G) |
| Material | HSSE |
| Finish | Bright |
| Designation | N |
| Chamfer | Form B / 4.5 x P |
| Thread standard | ISO 228 |
| Standard | DIN 5156 |
| Flutes | 3 to 4 |
| Sizes in this listing | 8 sizes, G 1/8 x 28 TPI to G 1 x 11 TPI |
Related products
Related Sutton taps: T179 BSPF (G) Spiral Point Tap - HSSE - Steam Oxide - DIN 5156, T180 BSPF (G) Spiral Point Tap - HSSE - TiN - DIN 5156, T181 BSPF (G) Spiral Point Tap VA - HSSE - Steam Oxide - DIN 5156, T349 BSPF (G) Spiral Point Tap VA PM - PM-HSSE V3 - Steam Oxide - DIN 5156, T350 BSPF (G) Spiral Point Tap VA PM - PM-HSSE V3 - TiCN - DIN 5156.
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