Sutton T539 1/4 x 28 TPI Forming Tap Single Coolant Groove B Lead - HSSE - TiN - JIS
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The Sutton T539 is a forming (roll) tap with single coolant groove for UNF threads, made from premium grade high speed steel (HSSE) with a gold titanium nitride (TiN) coating. This listing covers 4 sizes from #4 x 48 TPI to 1/4 x 28 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 JIS (Japanese Industrial Standards).
Where this product is used
- For cold forming of threads in materials with good flow characteristics.
- Suitable for material with >10% elongation.
- Through or blind holes.
- 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.
- Gold titanium nitride (TiN) coating for 3 to 8 times longer tool life than uncoated tools, with higher speeds and feeds.
- JIS (Japanese Industrial Standards) construction.
Sizes
Dimensions are in millimetres. Item numbers are the Sutton catalogue numbers. The tap hole column is the hole diameter range to prepare before forming the thread.
| Item no. | Thread size | TPI | Tap hole min-max (mm) | l1 overall (mm) | l2 thread (mm) | l3 (mm) | d2 shank (mm) | sq square (mm) | Limit |
|---|---|---|---|---|---|---|---|---|---|
| T539 0284 | #4 x 48 TPI | 48 | 2.54-2.63 | 46 | 11 | 23 | 3 | 2.5 | GH5 |
| T539 0351 | #6 x 40 TPI | 40 | 3.2 | 48 | 9 | 23 | 4 | 3.2 | GH6 |
| T539 0483 | #10 x 32 TPI | 32 | 4.43-4.51 | 60 | 11 | 25 | 5.5 | 5 | GH6 |
| T539 0635 | 1/4 x 28 TPI | 28 | 5.93-5.98 | 62 | 14 | 31 | 6 | 4.5 | GH7 |
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | T539 |
| Type | Forming (roll) tap with single coolant groove |
| Thread series | UNF |
| Material | HSSE |
| Finish | TiN |
| Designation | N |
| Standard | JIS |
| Sizes in this listing | 4 sizes, #4 x 48 TPI to 1/4 x 28 TPI |
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Sutton T539 UNF Forming Tap Single Coolant Groove B Lead - HSSE - TiN - JIS: 1/4
SKU: A0131461 | Model: T5390635