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Description
Material HSS
Thread size M39
ChamferC (2–3) threads
Standard DIN 376
Technical data for the universal M39 HSS INOX 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 | C (2÷3) P |
| Thread tolerance | 6H |
Where chips remain in a straight-flute tap
The flute holds the chips until the tap is reversed out
The straight flute runs parallel to the tap axis. There is no helix to carry chips upward. The chamfer cutting edges are not ground at an angle, so they do not push chips downward. Short chips break into fragments and remain in the flute, next to the cutting edges that produced them. They leave the hole only when the tap is backed out. The M39 x4 tap has a reduced shank to DIN 376: diameter 32 mm, square size 24 mm.
1
Straight flute – chips remain in the flute, next to the cutting edges that produced them.
2
Chamfer C: 2–3 incomplete threads on the tapered lead.
3
The tap rotates clockwise to cut a right-hand thread.
4
Individual fragments exit at the top, onto the workpiece surface.
5
A few fragments fall below the tip and exit through the bottom of the hole.
6
Feed 4 mm/rev, equal to the pitch of the M39 x4 thread.
M39 HSS machine tap – a general-purpose tool for CNC machining
This HSS series model with a long shank in accordance with DIN 376, designed for cutting M39 metric threads in structural steels and cast iron, offers an economical price while maintaining high quality. The M39 HSS machine tap is made from high-speed steel with a hardness of 64 HRC, providing durability when machining materials with a strength of up to 800 MPa. Form C with straight flutes makes the tool suitable for through holes and blind holes. The M39 machine tap for through holes and blind holes is designed for workshops and maintenance departments.
Key advantages of the M39 HSS tap for through holes and blind holes
- Long shank to DIN 376 provides increased clamping rigidity and eliminates vibration at the high cutting torques typical of large diameters
- Economical HSS steel with a hardness of 64 HRC provides an optimal solution for machining structural steels and cast iron in one-off and small-batch production
- Material versatility covering structural steels up to 800 MPa, GG25 gray cast iron, GGG40 ductile cast iron, and aluminum and brass alloys
- Precision to tolerance class 6H for demanding fit tolerances in the production of mechanical and structural components with standard accuracy
- Compliance with DIN 376 ensures standardized long shank dimensions and interchangeability with tools from European manufacturers
- M39 HSS machine tap with form C allows tapping of through holes and blind holes without changing the tool or parameters
The M39 general-purpose machine tap is used in maintenance, machine reconditioning, and one-off production of steel components. The M39 HSS machine tap is not recommended for stainless or hardened steels. The tap drill diameter for the M39 thread is 35 mm for a coarse thread with a pitch of 4 mm.
Cutting data for the universal M39 HSS INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 41-163 | 164-652 |
| MStainless steel / INOX | 5-10 | 41-82 | 164-328 |
| KCast iron | 5-15 | 41-122 | 164-488 |
| NAluminum | 10-25 | 82-204 | 328-816 |
Thread preparation M39
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 35 mm
3 Tapping
M39
✓ Done!
Tolerance 6H
Standard: DIN 376 | Chamfer: C (straight) | Application: general-purpose (through and 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 M39 HSS tap is suitable for structural steels up to 800 MPa, gray and ductile cast iron, and aluminum alloys and brass. It is not recommended for stainless steels or steels hardened above 45 HRC.
The nominal tap drill diameter for the M39 thread is 35 mm. The hole tolerance zone should be within the range of 34.9–35.1 mm. A hole at the lower tolerance limit produces a fuller thread profile, while a hole at the upper limit reduces tapping torque.
The M39 tap works with ER40 holders and tapping chucks with axial compensation. Synchronized heads with automatic tool change capability are recommended for CNC machines.
Product accessories
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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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