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Description
Material HSSE
Thread size M27
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M27 HSSE INOX general-purpose machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M27 |
| Thread Pitch P | 3 mm |
| Overall Length l1 | 160 mm |
| Flute Length l2 | 38 mm |
| Shank Diameter d2 | 20 mm |
| Square Drive Size a | 16 mm |
| Tap Drill Diameter | 24 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 M27 x3 tap has a reduced shank to DIN 376: diameter 20 mm, square size 16 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 3 mm/rev, equal to the pitch of the M27 x3 thread.
M27 INOX machine tap – versatile HSSE tool
The M27 INOX machine tap is a professional tool for cutting M27 internal threads in stainless, structural, and alloy steels. Its HSSE high-speed steel construction with 5% cobalt provides a hardness of 66 HRC and high resistance to temperatures up to 650°C in the cutting zone. Form C with straight flutes allows tapping of both through and blind holes without changing tools. The 6H tolerance in accordance with DIN 376 ensures dimensional repeatability. The Fra M27 general-purpose machine tap is designed for toolrooms and CNC machining center operators.
Key advantages of the M27 tap for through and blind holes
- Durability and heat resistance thanks to HSSE steel with 5% cobalt, which retains its cutting properties at temperatures up to 650°C in the contact zone with the workpiece material
- Compliance with DIN 376 confirms standardized long-shank dimensions and full compatibility with European cutting tool holding systems
- Precision to tolerance class 6H guarantees the dimensional accuracy required in the production of pneumatic components and high-quality industrial valves and fittings
- Compatibility with ER32 holders and tapping chucks with axial compensation for synchronous tapping on CNC and conventional machines
- Designed for stainless steels austenitic grades 304 and 316 and ferritic grades, which require tools with increased heat and abrasion resistance
- M27 HSSE machine tap with form C evacuates chips properly in through holes and blind holes without the risk of thread damage
The M27 machine tap for through and blind holes is used in the production of industrial fittings and pneumatic components requiring leak-tight threaded connections. Cooling with an EP emulsion at a minimum concentration of 8% extends tool life by a factor of 2-3. The tap drill diameter for an M27 thread is 24 mm for a coarse thread with a pitch of 3 mm.
Cutting data for the universal M27 HSSE INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 59-236 | 177-708 |
| MStainless steel / INOX | 5-10 | 59-118 | 177-354 |
| KCast iron | 5-15 | 59-177 | 177-531 |
| NAluminum | 10-25 | 118-295 | 354-885 |
Thread preparation M27
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 24 mm
3 Tapping
M27
✓ 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 M27 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 M27 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.
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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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