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Description
Material HSSE
Thread size M12
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M12 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M12 |
| Thread Pitch P | 1.75 mm |
| Overall Length l1 | 110 mm |
| Flute Length l2 | 29 mm |
| Shank Diameter d2 | 9 mm |
| Square Drive Size a | 7 mm |
| Tap Drill Diameter | 10.2 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 M12 x1.75 tap has a reduced shank to DIN 376: diameter 9 mm, square size 7 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 1.75 mm/rev, equal to the pitch of the M12 x1.75 thread.
M12 machine tap for through holes – Narex HSSE with a long shank to DIN 376
Narex offers the M12 through-hole machine tap made of HSSE high-speed steel with 5% cobalt for professional applications in series production and maintenance. Size M12 is among the most common metric threads used in machine building, steel structures, and heavy industry requiring reliable threaded connections. The long shank according to DIN 376 provides greater clamping rigidity and better tool guidance when tapping deep holes in difficult-to-machine materials. The Narex brand guarantees consistent quality and repeatable tool geometry.
Why choose the Narex M12 machine tap
- The Narex brand as a renowned cutting tool manufacturer with a long tradition, guarantees the highest manufacturing quality, consistent parameters and excellent value for money
- Popular M12 size widely used in machine building, steel structures, and series production of mechanical components requiring reliable threaded connections
- Long shank to DIN 376 provides greater clamping rigidity and better tool guidance, which is important when tapping deep holes in difficult-to-machine materials
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life under intensive use
- Compatibility with ER20 and ER25 holders and tapping heads for CNC machining centers with synchronous tapping and automatic axial compensation
- Metric pitch of 1.75 mm to DIN 13 for M12 coarse threads, with a recommended tap drill diameter of 10.2 mm ensuring optimum thread engagement
The Narex M12 machine tap performs well in maintenance departments for thread restoration and machine repairs, and in toolrooms for manufacturing precision mechanical components. Form B with straight flutes directs chips forward when tapping through holes. Cooling with an emulsion containing EP additives at a concentration of 8-10% is recommended for optimum tool life.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 133-531 | 233-929 |
| MStainless steel | 5-10 | 133-265 | 233-464 |
| KCast iron | 5-15 | 133-398 | 233-696 |
| NAluminum | 10-25 | 265-663 | 464-1160 |
Thread preparation M12 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 10.2 mm
3 Tapping
M12
✓ 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 M12 HSSE tap performs well in structural steels up to 800 MPa, alloy steels, austenitic stainless steels 304/316, gray and ductile cast iron, aluminum, and brass.
The recommended tap drill diameter for the M12 coarse thread is 10.2 mm. Accurate hole preparation ensures a full thread profile and minimizes the load on the tap.
Narex is a reputable manufacturer with a long tradition, offering tools with consistent quality and repeatable geometric specifications. Narex taps offer good value for money.
Product accessories
Counterbore 20X10.2 M12 DIN 373 HSS
Reference: 0000003391 In stock > 10 items
€22.89
€28.16 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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