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Description
Material HSSE
Thread size M14x1.25
ChamferD (3.5÷5) threads
Standard DIN 374
Technical data for the M14x1.25 left-hand machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M14x1.25 |
| Thread Pitch P | 1.25 mm |
| Helix Angle | 15° |
| Overall Length l1 | 100 mm |
| Flute Length l2 | 20 mm |
| Shank Diameter d2 | 11 mm |
| Square Drive Size a | 9 mm |
| Tap Drill Diameter | 12.8 mm |
| Chamfer | D (3.5÷5) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 15° flute works like a screw conveyor
The flutes of this tap follow a left-hand helix at an angle of 15° to the axis. The tap rotates counterclockwise and advances into the hole. The chip cut by the chamfer enters the flute, and the helix feeds 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 M14x1.25 tap has a reduced shank according to DIN 374: diameter 11 mm, square size 9 mm.
1
The 15° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates counterclockwise – this is how it cuts a left-hand thread.
4
Form D chamfer: 3.5–5 incomplete threads on the lead-in taper.
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 M14x1.25 thread.
M14x1.25 left-hand machine tap for blind holes – HSSE DIN 374
The M14x1.25 left-hand machine tap is a professional tool for producing internal threads in blind holes. Made of HSSE high-speed steel with 5% cobalt and a hardness of 65-67 HRC, it provides optimal cutting edge life and stable operation at temperatures up to 650°C. Tolerance 6H according to DIN 374.
Key advantages of the M14x1.25 left-hand machine tap
- HSSE material – hardness of 65-67 HRC and heat resistance up to 650°C
- Form D chamfer (3.5÷5 threads) – optimal for blind holes
- Tolerance 6H – standard accuracy grade for bolted joints
- Compliance with DIN 374 – verified dimensional quality
- 15° spiral flutes – efficient rearward chip evacuation
The M14x1.25 machine tap is used in toolrooms and maintenance departments. The recommended tap drill diameter is 12.8 mm.
Cutting data for the M14x1.25 left-hand machine tap for blind holes
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 113-454 | 141-567 |
| MStainless steel | 5-10 | 113-227 | 141-283 |
| KCast iron | 5-15 | 113-341 | 141-426 |
| NAluminum | 10-25 | 227-568 | 283-710 |
Thread preparation M14x1.25 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 12.8 mm
3 Tapping
M14x1.25
✓ Done!
Tolerance 6H
Standard: DIN 374 | Chamfer: D (spiral) | 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)
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| 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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