Sutton T421 3/4 x 10 TPI Straight Flute Tap Left Hand Bottoming - HSS - Bright - ISO 529
Available
The Sutton T421 is a straight flute tap (bottoming chamfer, left hand) for UNC threads, made from high speed steel (HSS) with a bright finish. This listing covers 8 sizes from 1/4 x 20 TPI to 3/4 x 10 TPI.
Straight flutes suit through or blind holes, but they hold only a small amount of chips and do not transport them axially, so deep holes are best avoided except in short chipping materials. 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.
- Through & blind holes.
- Suitable for both hand and machine operations.
- Depths up to approx. 1 x d1.
Design features
- High speed steel (HSS). Standard tool material for most common applications.
- Bright finish for general purpose applications.
- 3 to 4 flutes, depending on size.
- 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| T421 0635 | 1/4 x 20 TPI | 20 | 5.1 | 66 | 19 | 25 | 6.3 | 5 | 8 | 3 | GH4 |
| T421 0794 | 5/16 x 18 TPI | 18 | 6.6 | 72 | 22 | 30 | 8 | 6.3 | 9 | 4 | GH5 |
| T421 0953 | 3/8 x 16 TPI | 16 | 8 | 80 | 24 | 33 | 10 | 8 | 11 | 4 | GH5 |
| T421 1111 | 7/16 x 14 TPI | 14 | 9.4 | 85 | 25 | - | 8 | 6.3 | 9 | 4 | GH5 |
| T421 1270 | 1/2 x 13 TPI | 13 | 10.8 | 89 | 29 | - | 9 | 7.1 | 10 | 4 | GH6 |
| T421 1429 | 9/16 x 12 TPI | 12 | 12.2 | 95 | 30 | - | 11.2 | 9 | 12 | 4 | GH6 |
| T421 1588 | 5/8 x 11 TPI | 11 | 13.5 | 102 | 32 | - | 12.5 | 10 | 13 | 4 | GH6 |
| T421 1905 | 3/4 x 10 TPI | 10 | 16.5 | 112 | 37 | - | 14 | 11.2 | 14 | 4 | GH7 |
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | T421 |
| Type | Straight flute tap |
| Thread series | UNC |
| Material | HSS |
| Finish | Bright |
| Chamfer | Bottoming (Form E) |
| Standard | ISO 529 |
| Flutes | 3 to 4 |
| Sizes in this listing | 8 sizes, 1/4 x 20 TPI to 3/4 x 10 TPI |
Related products
Related Sutton taps: T419 UNC Straight Flute Tap Left Hand Taper - HSS - Bright - ISO 529, T420 UNC Straight Flute Tap Left Hand Intermediate - HSS - Bright - ISO 529, T416 UNC Straight Flute Tap Bottoming - HSS - Bright - ISO 529, T415 UNC Straight Flute Tap Intermediate - HSS - Bright - ISO 529, T414 UNC Straight Flute Tap Taper - HSS - Bright - ISO 529.
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Sutton T421 UNC Straight Flute Tap Left Hand Bottoming - HSS - Bright - ISO 529: 10
SKU: A0015212 | Model: T4211905
TPI 10. Features
The Sutton T421 is a straight flute tap (bottoming chamfer, left hand) for UNC threads, made from high speed steel (HSS) with a bright finish. This listing covers 8 sizes from 1/4 x 20 TPI to 3/4 x 10 TPI.
Straight flutes suit through or blind holes, but they hold only a small amount of chips and do not transport them axially, so deep holes are best avoided except in short chipping materials. 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.
