Sutton T428 3/8 x 16 TPI Forming Tap Single Coolant Groove - HSSE - Bright - ISO 529
Available
The Sutton T428 is a forming (roll) tap with single coolant groove for UNC threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 8 sizes from #5 x 40 TPI to 1/2 x 13 TPI.
A forming tap has no flutes and does not cut: it rolls the thread by displacing the metal, so it makes no chips and suits blind and through holes. Forming needs more machine power because of the torque involved, the rolled thread is stronger than a cut thread because the grain structure stays uniform through the thread form, and the tapping drill size differs from that of a cutting tap.
The tap is built to ISO 529: short machine tap construction.
Where this product is used
- For cold forming of threads in materials with good flow characteristics.
- Through or blind holes.
- Depths up to approx. 1.5 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.
- TiN for longer tool life.
- 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) | Limit |
|---|---|---|---|---|---|---|---|---|---|---|
| T428 0318 | #5 x 40 TPI | 40 | 2.9 | 48 | 15 | 15 | 3.15 | 2.5 | 5 | GH5 |
| T428 0351 | #6 x 32 TPI | 32 | 3.2 | 50 | 17 | 17.5 | 3.55 | 2.8 | 5 | GH6 |
| T428 0417 | #8 x 32 TPI | 32 | 3.8 | 53 | 13 | 18 | 4.5 | 3.55 | 6 | GH6 |
| T428 0483 | #10 x 24 TPI | 24 | 4.4 | 58 | 16 | 22 | 5 | 4 | 7 | GH6 |
| T428 0635 | 1/4 x 20 TPI | 20 | 5.8 | 66 | 19 | 25 | 6.3 | 5 | 8 | GH7 |
| T428 0794 | 5/16 x 18 TPI | 18 | 7.3 | 72 | 22 | 30 | 8 | 6.3 | 9 | GH7 |
| T428 0953 | 3/8 x 16 TPI | 16 | 8.8 | 80 | 24 | 33 | 10 | 8 | 11 | GH7 |
| T428 1270 | 1/2 x 13 TPI | 13 | 11.7 | 89 | 29 | - | 9 | 7.1 | 10 | GH8 |
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | T428 |
| Type | Forming (roll) tap with single coolant groove |
| Thread series | UNC |
| Material | HSSE |
| Finish | Bright |
| Designation | Short |
| Standard | ISO 529 |
| Sizes in this listing | 8 sizes, #5 x 40 TPI to 1/2 x 13 TPI |
Related products
Related Sutton taps: T429 UNC Forming Tap Single Coolant Groove - HSSE - TiN - ISO 529.
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Sutton T428 UNC Forming Tap Single Coolant Groove - HSSE - Bright - ISO 529: 16 / 3/8
SKU: A0015282 | Model: T4280953
TPI 16, Diameter (inch) 3/8. Features
The Sutton T428 is a forming (roll) tap with single coolant groove for UNC threads, made from premium grade high speed steel (HSSE) with a bright finish. This listing covers 8 sizes from #5 x 40 TPI to 1/2 x 13 TPI.
A forming tap has no flutes and does not cut: it rolls the thread by displacing the metal, so it makes no chips and suits blind and through holes. Forming needs more machine power because of the torque involved, the rolled thread is stronger than a cut thread because the grain structure stays uniform through the thread form, and the tapping drill size differs from that of a cutting tap.
The tap is built to ISO 529: short machine tap construction.