Sutton M2212858 1-1/8"-12 UNF Intermediate Hand Tap - Straight Flute, TCA
Available
The Sutton M221 is a UNF (Unified National Fine) intermediate hand tap in 13 sizes, 1/4" to 1-1/4", with a straight flute and a square shank, made from Tungsten Chrome Alloy (TCA) and sold singly. An intermediate tap assists in aligning and starting the tap into an untapped hole.
The square shank is designed for hard threading work in a variety of materials. Carbon taps are not suitable for precision, safety or critical threads. They are for general purpose and DIY use only. The straight flutes are designed for tapping into materials where chips break up readily and present no disposal problems, particularly in through-hole tapping. Straight flute taps are only suitable for hand operations, tapping up to 1-1/2 x diameter.
Where this product is used
- Routine maintenance, repair work and re-threading where high accuracy and tolerance thread is not critical.
- Tapping through holes in materials where chips break up readily.
- Unified National Special (UNS) thread: 1"-14 UNS.
- Applications include DIY, trade, automotive, plumbing, metalworking and MRO work.
Design features
- Tungsten Chrome Alloy (TCA): carbon taps for general purpose use.
- Square shank: for hard threading work in a variety of materials.
- Straight flutes: suited to through-hole tapping.
- Lead: An intermediate tap assists in aligning and starting the tap into an untapped hole.
Sizes and item numbers
Tap drill is the drill size to use before tapping.
| Size | TPI | Thread series | Tap drill (mm) | Sutton item no. |
|---|---|---|---|---|
| 1/4" | 28 | UNF (Unified National Fine) | 5.5 | M221 0635 |
| 5/16" | 24 | UNF (Unified National Fine) | 6.9 | M221 0794 |
| 3/8" | 24 | UNF (Unified National Fine) | 8.5 | M221 0953 |
| 7/16" | 20 | UNF (Unified National Fine) | 9.8 | M221 1111 |
| 1/2" | 20 | UNF (Unified National Fine) | 11.5 | M221 1270 |
| 9/16" | 18 | UNF (Unified National Fine) | 12.8 | M221 1429 |
| 5/8" | 18 | UNF (Unified National Fine) | 14.5 | M221 1588 |
| 3/4" | 16 | UNF (Unified National Fine) | 17.5 | M221 1905 |
| 7/8" | 14 | UNF (Unified National Fine) | 20.5 | M221 2223 |
| 1" | 12 | UNF (Unified National Fine) | 23.5 | M221 2540 |
| 1" | 14 | UNS (Unified National Special) | 24 | M221 2541 |
| 1-1/8" | 12 | UNF (Unified National Fine) | 26.5 | M221 2858 |
| 1-1/4" | 12 | UNF (Unified National Fine) | 29.5 | M221 3175 |
Using the tap
- Drill the tap drill size shown in the size table for the thread you are cutting, then start the tap square to the hole.
- Turn the tap with a tap wrench on the square shank, backing off regularly to break the chip.
- Use a cutting fluid suited to the material being tapped.
- Use for hand tapping only, to a depth of up to 1-1/2 x the tap diameter.
Key specifications
| Specification | Detail |
|---|---|
| Catalogue code | M221 |
| Thread form | UNF (Unified National Fine) |
| Sizes | 13 sizes, 1/4" to 1-1/4" |
| Lead | Intermediate |
| Flute | Straight flute |
| Shank | Square shank |
| Material | Tungsten Chrome Alloy (TCA) |
| Maximum tapping depth | 1-1/2 x diameter (hand operation only) |
| Pack | Sold singly |
Related products
Related Sutton taps: M220 UNF taper hand taps, M222 UNF bottoming hand taps and M217 UNC intermediate hand taps. Browse threading tools and threading dies and sets, or Tap Magic cutting fluids.
Resources
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12 / 1
Model Number: M2212540
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12 / 1 1/8
Model Number: M2212858
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12 / 1 1/4
Model Number: M2213175
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14 / 1
Model Number: M2212541
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14 / 7/8
Model Number: M2212223
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16 / 3/4
Model Number: M2211905
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18 / 5/8
Model Number: M2211588
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18 / 9/16
Model Number: M2211429
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20 / 1/2
Model Number: M2211270
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20 / 7/16
Model Number: M2211111
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24 / 3/8
Model Number: M2210953
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24 / 5/16
Model Number: M2210794
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28 / 1/4
Model Number: M2210635
