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Description
Material HSSE
Thread size M18
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M18 HSSE INOX general-purpose 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 | 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 M18 x2.5 tap has a reduced shank to DIN 376: diameter 14 mm, square size 11 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 2.5 mm/rev, equal to the pitch of the M18 x2.5 thread.
M18 INOX machine tap – for stainless and alloy steel
The M18 INOX machine tap is designed for precision tapping of holes with a diameter of 18 mm in stainless and structural steels. HSSE high-speed steel construction with 5% cobalt ensures a hardness of 66 HRC and long cutting edge life even when machining difficult-to-machine materials. Form C with straight flutes provides versatile use in through and blind holes. The 6H tolerance according to DIN 376 confirms high manufacturing quality and dimensional repeatability. The M18 HSSE machine tap is intended for maintenance departments and industrial service shops.
Key features of the M18 INOX tap
- Manufacturing precision to 6H tolerance ensures dimensional repeatability and full thread interchangeability in series production of mechanical and hydraulic components
- Compliance with DIN 376 confirms quality and ensures standardized long-shank dimensions compatible with European and Asian holders
- Durability increased by the addition of 5% cobalt allows operation at temperatures up to 650°C without loss of cutting edge performance
- Compatibility with ER32 holders and tapping heads for CNC machining centers with synchronous tapping and automatic tool changing
- Designed for stainless steels austenitic grades 304 and 316 and ferritic grades, which require tools with increased heat and abrasion resistance
- Universal M18 machine tap with form C allows through and blind holes to be tapped with a single tool without the risk of jamming
The M18 machine tap for through and blind holes is suitable for maintenance departments restoring threads and repairing production machinery in industrial plants. It is also used in service and repair shops. The tap drill diameter for the M18 thread is 15.5 mm for a coarse thread with a pitch of 2.5 mm.
Cutting data for the universal M18 HSSE INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 88-354 | 220-885 |
| MStainless steel / INOX | 5-10 | 88-177 | 220-442 |
| KCast iron | 5-15 | 88-265 | 220-662 |
| NAluminum | 10-25 | 177-442 | 442-1105 |
Thread preparation M18
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 15.5 mm
3 Tapping
M18
✓ 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 M18 HSSE tap with form C and straight flutes is universal – suitable for both through holes and blind holes. Its design ensures proper chip evacuation in both hole types.
The M18 HSSE tap produces an internal thread to tolerance class 6H. The designation 6H specifies the permissible deviations of the thread pitch and minor diameters – the digit 6 indicates the tolerance zone width (medium), and the letter H indicates the position of the zone at the zero line. Tolerance 6H ensures proper fit with screws to tolerance 6g.
When tapping stainless steels, an EP emulsion at a minimum concentration of 8% or tapping oil is recommended for cooling. Cooling extends tool life by a factor of 2-3 and improves the thread surface finish.
Product accessories
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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