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Description
Material HSSE
Thread size M12x1.25
ChamferC (2–3) threads
Standard ISO 529
Technical data for the M12x1.25 blind hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M12x1.25 |
| Thread Pitch P | 1.25 mm |
| Helix Angle | 35° |
| Overall Length l1 | 84 mm |
| Flute Length l2 | 24 mm |
| Length l3 | 42 mm |
| Shank Diameter d2 | 9 mm |
| Square Drive Size a | 7.1 mm |
| Tap Drill Diameter | 10.8 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. The chip cut by the chamfer enters the flute, and the helix carries it upward like the auger in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter packed chips. The shank of the M12x1.25 tap has a diameter of 9 mm and a square size of 7.1 mm.
1
The 35° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
Feed 1.25 mm/rev, equal to the pitch of the M12x1.25 thread.
M12x1.25 spiral flute machine tap – compliant with ISO 529
The M12x1.25 spiral flute machine tap from Fra's fine thread series is designed for precision joints in machinery manufacturing. HSSE steel with 5% cobalt provides a hardness of 65-67 HRC and high thermal resistance of the cutting edge. The 35° spiral flute ensures controlled chip evacuation when tapping deep blind holes. The form C chamfer makes the tool particularly suitable for tapping close to the bottom of blind holes. The 6H tolerance in accordance with ISO 529 meets international manufacturing requirements.
Key features of the M12x1.25 spiral flute machine tap
- Manufacturing precision to 6H tolerance guarantees dimensional repeatability and full thread interchangeability in series production of mechanical components
- Compliance with ISO 529 confirms quality and ensures dimensional compatibility with tools from global and European manufacturers
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C without loss of the cutting edge's mechanical properties
- Compatibility with ER25 and ER32 tool holders and tapping heads for CNC machining centers with synchronous tapping capability
- Designed for stainless steels austenitic and ferritic, as well as materials requiring increased thermal resistance of the tool
- 35° spiral flutes ensure consistent chip evacuation when tapping blind holes up to 2.5D deep without the risk of breakage
The M12x1.25 spiral flute tap is suitable for maintenance departments restoring threads and repairing production machinery. The tap drill diameter is 10.8 mm for the M12x1.25 fine thread. The tool is compatible with standard mineral oil-based tapping lubricants and coolant emulsions.
Cutting data for the M12x1.25 blind hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 133-531 | 166-664 |
| MStainless steel | 5-10 | 133-265 | 166-331 |
| KCast iron | 5-15 | 133-398 | 166-498 |
| NAluminum | 10-25 | 265-663 | 331-829 |
Thread preparation M12x1.25 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 10.8 mm
3 Tapping
M12x1.25
✓ Done!
Tolerance 6H
Standard: ISO 529 | Chamfer: C (spiral flute) | Application: blind holes
Tolerance 6H — metric thread tolerance classes
| Class | Accuracy | Application | Status |
|---|---|---|---|
| 4H / 4g | High | Precision connections, hydraulics | — |
| 6H / 6g | Standard | Machine building, general-purpose | SELECTED |
| 7H / 8g | Low | Large clearance, easy assembly | — |
6H = internal thread (nut, hole) | 6g = external thread (screw)
Frequently asked questions
The M12x1.25 HSSE fine thread machine tap compliant with ISO 529 is suitable for structural steels up to 900 MPa, stainless steels, aluminum, and brass. ISO 529 ensures international compatibility with tools from global manufacturers.
For the M12x1.25 metric fine thread in tolerance class 6H, the recommended tap drill diameter is 10.75 mm. The hole tolerance zone should fall within the range of 10.75 to 10.95 mm. Exceeding the upper limit results in an incomplete thread profile.
Yes, cooling with an oil emulsion of at least 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling is required when machining stainless steels, while aluminum can be tapped with minimum quantity lubrication (MQL).
Product accessories
Counterbore 20X10.2 M12 DIN 373 HSS
Reference: 0000003391 In stock > 10 items
€22.89
€28.16 brutto
Hand Tap M12X1.25 DIN 2181/2 6H HSS
Reference: 0000007303 In stock > 10 items
€13.16
€16.18 brutto
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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