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Description
Material HSSE-PM
Thread size M8
ChamferB (3.5–5.5) threads
Standard DIN 371
Technical data for the M8 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M8 |
| Thread Pitch P | 1.25 mm |
| Overall Length l1 | 90 mm |
| Flute Length l2 | 20 mm |
| Length l3 | 35 mm |
| Shank Diameter d2 | 8 mm |
| Square Drive Size a | 6.2 mm |
| Tap Drill Diameter | 6.8 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 form B through-hole chamfer has a chip breaker at the front of the tap – an angled cut in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chip curls into a coil, breaks into short pieces, and exits the hole on the other side of the workpiece. Threads already cut remain clean because chips do not pass through them on their way up. The M8 x1.25 tap has a reinforced shank in accordance with DIN 371: diameter 8 mm, square 6.2 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 clockwise to cut a right-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 1.25 mm/rev, equal to the pitch of the M8 x1.25 thread.
M8 machine tap for through holes – HSSE-PM powder metallurgy steel
The M8 machine tap for through holes, made of HSSE-PM powder metallurgy steel, is a professional tool for the most demanding high-volume production applications. Powder metallurgy (PM) technology provides a uniform microstructure and a hardness of 67-69 HRC, significantly exceeding the performance of conventional HSSE taps. M8 is among the most popular metric thread sizes, and powder metallurgy steel construction guarantees 2-3 times the tool life of standard tools.
Key features of the M8 HSSE-PM machine tap
- HSSE-PM powder metallurgy steel with a uniform microstructure ensures a hardness of 67-69 HRC and 2-3 times the service life of conventional HSSE taps
- Most popular M8 size used across all industries — from electronics and automotive to machine building
- Increased wear resistance thanks to the uniform carbide structure, which translates into consistent performance throughout the service life
- The 6H tolerance in accordance with DIN 371 ensures thread accuracy and full interchangeability with fasteners
- Optimal geometry for difficult-to-machine materials, austenitic stainless steels, and titanium alloys
- Short shank according to DIN 371, compatible with ER16 and ER20 holders and tapping chucks with axial compensation
The M8 HSSE-PM machine tap is used in high-volume automotive, aerospace and medical manufacturing, where maximum productivity and repeatability with minimal downtime are required. Powder metallurgy steel is particularly effective when tapping stainless steels. 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 | 199-796 | 249-995 |
| MStainless steel | 5-10 | 199-398 | 249-498 |
| KCast iron | 5-15 | 199-597 | 249-746 |
| NAluminum | 10-25 | 398-995 | 498-1244 |
Thread preparation M8 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 6.8 mm
3 Tapping
M8
✓ Done!
Tolerance 6H
Standard: DIN 371 | 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
HSSE-PM powder metallurgy steel has a uniform microstructure, a higher hardness of 67-69 HRC and better wear resistance than conventional HSSE. It provides 2-3 times the tool life.
The M8 HSSE-PM tap is ideal for austenitic stainless steels, titanium alloys, nickel superalloys and other difficult-to-machine materials and materials prone to adhesion.
The M8 HSSE-PM tap achieves 2-3 times the tool life of conventional HSSE taps. It cuts 500-800 threads in stainless steel with proper cooling.
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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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