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Description
Material HSSE
Thread size M27x1.5
ChamferC (2–3) threads
Standard DIN 374
Technical data for the M27x1.5 left-hand HSSE INOX general-purpose machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M27x1.5 |
| Thread Pitch P | 1.5 mm |
| Overall Length l1 | 140 mm |
| Flute Length l2 | 27 mm |
| Shank Diameter d2 | 20 mm |
| Square Drive Size a | 16 mm |
| Tap Drill Diameter | 25.5 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 M27x1.5 tap has a reduced shank to DIN 374: 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 counterclockwise – this is how it cuts a left-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 1.5 mm/rev, equal to the pitch of the M27x1.5 thread.
M27x1.5 INOX left-hand machine tap – for left-hand threads
The HSSE series, intended for manufacturing engineers and CNC operators working with special components, includes the M27x1.5 INOX left-hand machine tap for left-hand threads. The 6H tolerance in accordance with DIN 374 ensures the dimensional repeatability required for manufacturing components protected against self-loosening. The left-hand cutting direction ensures correct cutting of left-hand threads in drive shafts and fastening screws. HSSE steel with 5% cobalt ensures a hardness of 66 HRC and long cutting-edge life in stainless and difficult-to-machine steels.
Key features of the M27x1.5 left-hand HSSE tap
- Left-hand thread used in components protected against self-loosening, drive shafts and screws securing grinding wheels that rotate clockwise
- Designed for stainless steels of austenitic grades 304 and 316, structural steels up to 800 MPa, and aluminum alloys and engineering brass
- Precision of the 6H tolerance required in the production of hydraulic housings, valve blocks, and components for high-pressure industrial valves and fittings
- Durability thanks to HSSE steel with 5% cobalt allows 350-500 left-hand threads to be cut in structural steel with proper oil lubrication
- Compatibility with ER32 holders and tapping heads for CNC machining centers with synchronous tapping and spindle reversal
- M27x1.5 general-purpose left-hand machine tap with form C directs chips correctly in both through holes and blind holes
The M27x1.5 left-hand HSSE machine tap is intended for manufacturing special components requiring left-hand threads. The M27x1.5 left-hand machine tap for through and blind holes is not recommended for hardened steels above 45 HRC. The tap drill diameter is 25.5 mm.
Cutting data for the M27x1.5 left-hand HSSE INOX general-purpose machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 59-236 | 88-354 |
| MStainless steel / INOX | 5-10 | 59-118 | 88-177 |
| KCast iron | 5-15 | 59-177 | 88-266 |
| NAluminum | 10-25 | 118-295 | 177-442 |
Thread preparation M27x1.5
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 25.5 mm
3 Tapping
M27x1.5
✓ Done!
Tolerance 6H
Standard: DIN 374 | 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 M27x1.5 left-hand HSSE tap with form C and straight flutes is a general-purpose tool – suitable for both through holes and blind holes. Its design ensures proper chip evacuation in both hole types.
The M27x1.5 left-hand HSSE tap cuts an internal thread to tolerance class 6H. The 6H designation specifies the permissible deviations of the thread pitch diameter and minor diameter – the digit 6 indicates the tolerance zone width (medium), and the letter H indicates the zone position at the zero line. The 6H tolerance ensures a proper fit with screws to tolerance 6g.
M27x1.5 left-hand threads are used in components protected against self-loosening, clockwise-rotating drive shafts, and screws securing grinding wheels. They prevent the joint from loosening under vibration.
Product accessories
Hand Tap M27X1.5 LH DIN 2181/2 6H HSS
Reference: 0000008729 In stock > 10 items
€52.63
€64.74 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 |
Machine Tap M27x1.5 LH DIN 374 C HSSE Podgląd zdjęć produktu
01 / 01
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