Sutton T425 1 x 8 TPI Spiral Flute Tap Bottoming - HSSE - Bright - ISO 529
Available
The Sutton T425 is a spiral flute tap (R40 spiral, bottoming chamfer) for UNC threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 14 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 tap has a bottoming chamfer (Form E, 1.5 to 2 threads on the lead), for blind holes with very short thread run-out.
The tap is built to ISO 529: short machine tap construction.
Where this product is used
- General purpose use.
- Suitable for materials up to 1000 N/mm2.
- Blind holes.
- 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.
- Bottoming chamfer (Form E), for blind holes with very short thread run-out.
- ISO 529 construction, short machine tap 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 | Limit |
|---|---|---|---|---|---|---|---|---|---|---|---|
| T425 0218 | #2 x 56 TPI | 56 | 1.85 | 41 | 8 | - | 2.5 | 2 | - | 2 | GH2 |
| T425 0284 | #4 x 40 TPI | 40 | 2.3 | 48 | 6 | - | 3.15 | 2.5 | 5 | 3 | GH2 |
| T425 0351 | #6 x 32 TPI | 32 | 2.8 | 50 | 6 | - | 3.55 | 2.8 | 5 | 3 | GH3 |
| T425 0417 | #8 x 32 TPI | 32 | 3.4 | 53 | 8 | 18 | 4.5 | 3.55 | 6 | 3 | GH3 |
| T425 0483 | #10 x 24 TPI | 24 | 3.8 | 58 | 11 | 22 | 5 | 4 | 7 | 3 | GH4 |
| T425 0635 | 1/4 x 20 TPI | 20 | 5.1 | 66 | 10 | 25 | 6.3 | 5 | 8 | 3 | GH4 |
| T425 0794 | 5/16 x 18 TPI | 18 | 6.6 | 72 | 13 | 30 | 8 | 6.3 | 9 | 3 | GH5 |
| T425 0953 | 3/8 x 16 TPI | 16 | 8 | 80 | 16 | 33 | 10 | 8 | 11 | 3 | GH5 |
| T425 1111 | 7/16 x 14 TPI | 14 | 9.4 | 85 | 18 | - | 8 | 6.3 | 9 | 3 | GH5 |
| T425 1270 | 1/2 x 13 TPI | 13 | 10.8 | 89 | 20 | - | 9 | 7.1 | 10 | 3 | GH6 |
| T425 1588 | 5/8 x 11 TPI | 11 | 13.5 | 102 | 20 | - | 12.5 | 10 | 13 | 3 | GH6 |
| T425 1905 | 3/4 x 10 TPI | 10 | 16.5 | 112 | 25 | - | 14 | 11.2 | 14 | 4 | GH7 |
| T425 2223 | 7/8 x 9 TPI | 9 | 19.5 | 118 | 38 | - | 16 | 12.5 | 16 | 4 | GH7 |
| T425 2540 | 1 x 8 TPI | 8 | 22.2 | 130 | 45 | - | 18 | 14 | 18 | 4 | GH7 |
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | T425 |
| Type | Spiral flute tap |
| Thread series | UNC |
| Material | HSSE |
| Finish | Bright |
| Spiral | R40 (40° right-hand) |
| Chamfer | Bottoming (Form E) |
| Standard | ISO 529 |
| Flutes | 2 to 4 |
| Sizes in this listing | 14 sizes, #2 x 56 TPI to 1 x 8 TPI |
Related products
Related Sutton taps: T426 UNC Spiral Flute Tap Bottoming - HSSE - Steam Oxide - ISO 529, T427 UNC Spiral Flute Tap Bottoming - HSSE - TiN - ISO 529, T273 UNC Spiral Flute Tap R40 - HSSE - TiN - DIN 2184-1, T262 UNC Spiral Flute Tap R45 VA DH - HSSE - TiCN - DIN 2184-1, T261 UNC Spiral Flute Tap R45 VA DH - HSSE - Steam Oxide - DIN 2184-1.
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Sutton T425 UNC Spiral Flute Tap Bottoming - HSSE - Bright - ISO 529: 8 / #1
SKU: A0015260 | Model: T4252540
TPI 8, Diameter (inch) #1. Features
The Sutton T425 is a spiral flute tap (R40 spiral, bottoming chamfer) for UNC threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 14 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 tap has a bottoming chamfer (Form E, 1.5 to 2 threads on the lead), for blind holes with very short thread run-out.
The tap is built to ISO 529: short machine tap construction.