Sutton T258 1/4 x 20 TPI Spiral Flute Tap R40 - HSSE - Bright - DIN 2184-1
Available
The Sutton T258 is a spiral flute tap (R40 spiral, N designation) for UNC threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 17 sizes from #2 x 56 TPI to 1 x 8 TPI.
The 40° right-hand spiral flute suits blind holes in long chipping materials: the high helix angle curls the chips and transports them back out of the hole. The tap cuts on reversal, so the flutes have rake on both front and back faces. The N designation is for normal, general purpose materials, with a normal rake angle and normal thread relief. The chamfer is Form C (2.5 x P), generally for blind holes.
The thread tolerance is 2B. The tap is built to DIN 2184-1.
Where this product is used
- General purpose use, materials up to approx. 1000 N/mm2.
- Blind holes.
- Suitable for machine operations.
- Depths up to approx. 2.5 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.
- 2 to 4 flutes, depending on size.
- 40° right-hand spiral flute.
- Form C chamfer, 2.5 x P.
- Thread tolerance 2B.
- The N designation is for normal, general purpose materials, with a normal rake angle and normal thread relief.
- DIN 2184-1 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.
| Item no. | Thread size | TPI | Tapping drill (mm) | l1 overall (mm) | l2 thread (mm) | l3 (mm) | d2 shank (mm) | sq square (mm) | l4 square length (mm) | Flutes |
|---|---|---|---|---|---|---|---|---|---|---|
| T258 0218 | #2 x 56 TPI | 56 | 1.85 | 45 | 9 | 10 | 2.8 | 2.1 | 5 | 2 |
| T258 0284 | #4 x 40 TPI | 40 | 2.3 | 56 | 5 | 18 | 3.5 | 2.7 | 6 | 2 |
| T258 0318 | #5 x 40 TPI | 40 | 2.6 | 56 | 6 | 18 | 3.5 | 2.7 | 6 | 3 |
| T258 0351 | #6 x 32 TPI | 32 | 2.8 | 56 | 6 | 19 | 4 | 3 | 6 | 3 |
| T258 0417 | #8 x 32 TPI | 32 | 3.4 | 63 | 7 | 19 | 4.5 | 3.4 | 6 | 3 |
| T258 0483 | #10 x 24 TPI | 24 | 3.8 | 70 | 8 | 20 | 6 | 4.9 | 8 | 3 |
| T258 0549 | #12 x 24 TPI | 24 | 4.5 | 80 | 10 | 29 | 6 | 4.9 | 8 | 3 |
| T258 0635 | 1/4 x 20 TPI | 20 | 5.1 | 80 | 10 | 30 | 7 | 5.5 | 8 | 3 |
| T258 0794 | 5/16 x 18 TPI | 18 | 6.6 | 90 | 13 | 34 | 8 | 6.2 | 9 | 3 |
| T258 0953 | 3/8 x 16 TPI | 16 | 8 | 100 | 15 | 35 | 10 | 7 | 10 | 3 |
| T258 1111 | 7/16 x 14 TPI | 14 | 9.4 | 100 | 15 | - | 8 | 6.2 | 8 | 3 |
| T258 1270 | 1/2 x 13 TPI | 13 | 10.8 | 110 | 18 | - | 9 | 7 | 10 | 3 |
| T258 1429 | 9/16 x 12 TPI | 12 | 12.2 | 110 | 20 | - | 11 | 9 | 12 | 3 |
| T258 1588 | 5/8 x 11 TPI | 11 | 13.5 | 110 | 20 | - | 12 | 9 | 12 | 3 |
| T258 1905 | 3/4 x 10 TPI | 10 | 16.5 | 125 | 25 | - | 14 | 11 | 14 | 4 |
| T258 2223 | 7/8 x 9 TPI | 9 | 19.5 | 140 | 28 | - | 18 | 14.5 | 17 | 4 |
| T258 2540 | 1 x 8 TPI | 8 | 22.2 | 160 | 32 | - | 18 | 14.5 | 17 | 4 |
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | T258 |
| Type | Spiral flute tap |
| Thread series | UNC |
| Material | HSSE |
| Finish | Bright |
| Designation | N |
| Spiral | R40 (40° right-hand) |
| Chamfer | Form C / 2.5 x P |
| Thread tolerance | 2B |
| Standard | DIN 2184-1 |
| Flutes | 2 to 4 |
| Sizes in this listing | 17 sizes, #2 x 56 TPI to 1 x 8 TPI |
Related products
Related Sutton taps: T260 UNC Spiral Flute Tap R40 - HSSE - Steam Oxide - DIN 2184-1, T261 UNC Spiral Flute Tap R45 VA DH - HSSE - Steam Oxide - DIN 2184-1, T262 UNC Spiral Flute Tap R45 VA DH - HSSE - TiCN - DIN 2184-1, T273 UNC Spiral Flute Tap R40 - HSSE - TiN - DIN 2184-1, T425 UNC Spiral Flute Tap Bottoming - HSSE - Bright - ISO 529.
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