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Description
Material HSSE
Thread size M18
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M18 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M18 |
| Thread Pitch P | 2.5 mm |
| Overall Length l1 | 125 mm |
| Flute Length l2 | 32 mm |
| Shank Diameter d2 | 14 mm |
| Square Drive Size a | 11 mm |
| Tap Drill Diameter | 15.5 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 M18 x2.5 tap has a reduced shank to DIN 376: diameter 14 mm, square size 11 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 2.5 mm/rev, equal to the pitch of the M18 x2.5 thread.
M18 machine tap for through holes – cobalt HSSE with a long shank DIN 376
The M18 through-hole machine tap from the HSSE series is designed for cutting M18 internal threads in through holes on CNC and conventional machine tools. The long shank according to DIN 376 provides increased clamping rigidity and improved tool guidance when tapping large diameters in deep holes requiring high precision. High-speed steel with 5% cobalt provides a hardness of 65-67 HRC and high heat resistance in the cutting zone up to 650°C. The tool is intended for professional toolrooms, maintenance departments, and CNC operators.
Key features of the M18 machine tap for through holes
- Popular M18 size widely used in machine building, steel structures, industrial hydraulics, and series production requiring reliable connections
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is essential when tapping M18 diameters in deep holes
- 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
- Tolerance 6H according to DIN 376 ensures precise thread production and full interchangeability with fasteners used in the machinery and construction industries
- Compatibility with ER25 and ER32 tool holders and tapping heads for CNC machining centers with synchronous tapping and automatic compensation
- Metric pitch of 2.5 mm in accordance with DIN 13 for M18 coarse threads, with a recommended tap drill diameter of 15.5 mm for optimum thread engagement
The M18 machine tap for through holes is used in series production, heavy machine building, and maintenance departments for repairs and thread restoration in mechanical components. Form B with straight flutes ensures efficient forward chip evacuation. The tool requires cooling with an oil emulsion at a minimum concentration of 8-10% to maintain optimum tool life.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 88-354 | 220-885 |
| MStainless steel | 5-10 | 88-177 | 220-442 |
| KCast iron | 5-15 | 88-265 | 220-662 |
| NAluminum | 10-25 | 177-442 | 442-1105 |
Thread preparation M18 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 15.5 mm
3 Tapping
M18
✓ 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 M18 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 M18 coarse thread is 15.5 mm. Accurate hole preparation ensures a full thread profile and minimizes the load on the tap.
With proper cooling, the M18 HSSE tap cuts 300-500 threads in structural steel and 150-250 threads in stainless steel. Dry operation reduces tool life by 30-40%.
Product accessories
M18 DIN 376 C HSSE Machine Threader
Reference: 0000008242 In stock < 10 items
€21.58
€26.54 brutto
HSSE 15.5 cobalt metal drill bit DIN 338
Reference: 13293 In stock < 10 items
€15.26
€18.77 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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