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Description
Material HSSE
Thread size M27
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M27 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 | 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 M27 x3 tap has a reduced shank to DIN 376: diameter 20 mm, square size 16 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 3 mm/rev, equal to the pitch of the M27 x3 thread.
M27 machine tap for through holes – Fra HSSE with DIN 376 long shank
Manufacturer Fra offers an M27 machine tap for through holes made of HSSE high-speed steel with 5% added cobalt for machine building and steel structure applications. The long shank in accordance with DIN 376 provides increased clamping rigidity and improved tool guidance when tapping large diameters. The 6H tolerance ensures the dimensional repeatability required for series production of structural components. As a tap specialist, Fra guarantees high manufacturing quality.
Key benefits of the Fra M27 machine tap
- Manufacturer Fra as a tap specialist, guarantees high manufacturing quality and thread geometry accuracy in accordance with European standards
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is essential when tapping M27 diameters
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life
- Tolerance 6H according to DIN 376 ensures accurate threads and full interchangeability with standard-grade fasteners
- Compatibility with ER32 and ER40 tool holders and tapping chucks with axial compensation for CNC machining centers
- Metric pitch of 3 mm compliant with DIN 13 for M27 coarse threads, the recommended tap drill diameter is 24 mm
The Fra M27 machine tap is used in machine building, steel structures, and heavy industry where large-diameter threads are required. Form B with straight flutes directs chips forward when tapping through holes. Cooling with an oil emulsion at a concentration of 8-10% is recommended.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 59-236 | 177-708 |
| MStainless steel | 5-10 | 59-118 | 177-354 |
| KCast iron | 5-15 | 59-177 | 177-531 |
| NAluminum | 10-25 | 118-295 | 354-885 |
Thread preparation M27 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 24.0 mm
3 Tapping
M27
✓ 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 Fra M27 HSSE tap performs well in structural steels with strengths up to 800 MPa, alloy steels, stainless steels, gray and ductile cast iron, and aluminum. The addition of cobalt increases heat resistance.
The recommended tap drill diameter for the M27 coarse thread is 24 mm. Accurate hole machining ensures a full thread profile.
The M27 DIN 376 tap with a long shank works with ER32 and ER40 tool holders and tapping chucks with axial compensation. The long shank requires tool holders with sufficient depth.
Product accessories
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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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