Helicoil
Helicoil 4687-12 M12x1.75 Straight Flute Hand Tap 4 Flutes Plug
M12×1.75 metric coarse STI tap, 91.28 mm overall, 42.07 mm thread length, HSS, four-flute plug chamfer
- TypeHole, Drill, Bore & Wire Gauges
- M12×1.75 metric coarse thread cuts clean internal threads
- 28 mm overall length gives full reach in deep holes
- 07 mm thread length provides ample cutting surface
- Four straight flutes evacuate chips efficiently during tapping
- High-speed steel construction resists wear for repeated use
Thread repair tap for M12 × 1.75 holes
This Helicoil 4687-12 straight-flute hand tap cuts internal threads for M12 × 1.75 metric coarse screw-thread inserts. It is made from bright uncoated high-speed steel with a right-hand thread and a plug chamfer. The tool suits mechanics and maintenance teams repairing stripped or damaged holes in softer metals.
Plug chamfer eases entry but needs alignment
The plug chamfer starts threads more easily than a bottoming tap, yet the straight flutes demand steady, perpendicular pressure to avoid cross-threading. Chip evacuation is manual; back the tap out frequently to clear swarf or the flutes will pack and jam. A tap wrench matched to the 91.28 mm overall length gives the best leverage.
Verify hole size and thread limit before ordering
Check that the drilled hole matches the STI tap drill specification for M12 × 1.75 inserts and that the H3 thread limit suits the insert class you are installing. The 42.07 mm thread length must reach the full insert depth in your workpiece. This tap is not designed for through-hardened steels or blind holes deeper than its thread length.
Highlights
- M12×1.75 metric coarse thread cuts clean internal threads
- 28 mm overall length gives full reach in deep holes
- 07 mm thread length provides ample cutting surface
- Four straight flutes evacuate chips efficiently during tapping
- High-speed steel construction resists wear for repeated use
Specifications
| Brand | Helicoil |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
How can I confirm the Helicoil 4687-12 tap is cutting the correct M12x1.75 threads after setup?
Check that the tap produces a 42.07 mm thread length in the hole and that a matching M12x1.75 screw thread insert fits smoothly without binding.
What comes in the box with the Helicoil 4687-12 and what must I buy separately?
The box contains the M12x1.75 straight flute hand tap with plug chamfer and four flutes; a suitable tap wrench and cutting fluid are not included and must be purchased separately.
Which version of the Helicoil 4687-12 should I choose for a standard M12x1.75 metric coarse hole?
Select the 4687-12 model with H3 thread limit, 91.28 mm overall length and plug chamfer — it is designed for standard metric coarse M12x1.75 screw thread insert holes.
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