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Description
Material HSSE
Thread size M39
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M39 left-hand machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M39 |
| Thread Pitch P | 4 mm |
| Overall Length l1 | 200 mm |
| Flute Length l2 | 60 mm |
| Shank Diameter d2 | 32 mm |
| Square Drive Size a | 24 mm |
| Tap Drill Diameter | 35 mm |
| Chamfer | B (3.5÷5.5) P |
| Thread tolerance | 6H |
How the type B through-hole chamfer pushes chips down the hole
Chips exit at the bottom instead of returning through the thread
The type B through-hole chamfer has a chip breaker at the tip of the tap – an angled notch in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chips curl into a spring shape, break into short pieces and exit the hole on the other side of the workpiece. The threads already cut remain clean because the chips do not pass through them on their way up. The M39 x4 tap has a reduced shank to DIN 376: diameter 32 mm, square size 24 mm.
1
Straight flute – chips do not enter it; the flute carries lubricant to the cutting edges.
2
The chip breaker at the tip of the tap directs chips down the hole.
3
The tap rotates counterclockwise – this is how it cuts a left-hand thread.
4
B chamfer: 3.5–5.5 incomplete threads on the entry taper.
5
The chips break into segments: individual pieces at the top of the hole, with progressively more farther down. They fall out below the workpiece.
6
Feed 4 mm/rev, equal to the pitch of the M39 x4 thread.
M39 left-hand machine tap for through holes – HSSE with OX oxide coating
The M39 left-hand machine tap for through holes is a specialized tool for cutting internal left-hand threads with a nonstandard diameter of 39 mm in components that rotate clockwise. Made of HSSE high-speed steel with 5% cobalt and an OX oxide coating, it guarantees a hardness of 65-67 HRC and increased resistance to abrasive wear. The oxide coating improves sliding properties and reduces friction, which is particularly important when tapping large diameters requiring substantial torque.
Main advantages of the M39 left-hand machine tap with OX coating
- Left-hand thread direction (LH) used in components rotating clockwise where a right-hand thread could loosen on its own under torque
- OX oxide coating increases resistance to abrasive wear, reduces friction, and improves chip evacuation when tapping large diameters
- Nonstandard M39 size used in specialized applications where standard M36 or M42 threads do not meet the requirements
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and thermal resistance up to 650°C, essential when machining alloy steels
- The long shank according to DIN 376 provides greater clamping rigidity and better tool guidance when tapping large diameters
- Metric pitch of 4 mm in accordance with DIN 13, recommended tap drill diameter of 35 mm for a full left-hand thread profile
The M39 left-hand machine tap with OX coating is used in the machinery industry to manufacture drive shafts, spindles, and rotating components with a nonstandard diameter. The oxide coating extends tool life by 20-30% compared with the uncoated version. Cooling with an emulsion containing EP additives at a concentration of 8-10% is recommended.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 41-163 | 164-652 |
| MStainless steel | 5-10 | 41-82 | 164-328 |
| KCast iron | 5-15 | 41-122 | 164-488 |
| NAluminum | 10-25 | 82-204 | 328-816 |
Thread preparation M39 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 35 mm
3 Tapping
M39
✓ Done!
Tolerance 6H
Standard: DIN 376 | Chamfer: B (straight) | Application: through 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 OX oxide coating increases resistance to abrasive wear by 20-30%, reduces friction, improves chip evacuation, and reduces the risk of seizure when tapping large diameters.
The M39 left-hand thread is used in specialized rotating machinery, drive shafts, and wherever a combination of a nonstandard diameter and a left-hand thread is required.
The recommended tap drill diameter for the M39 left-hand thread is 35 mm — identical to that for the right-hand thread. Thread direction does not affect the tap drill diameter.
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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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