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Machine tap M28x2 DIN 374/35 C HSSE Fra
0000007286
€55.03 tax inc.
Net price: €44.74
Description
Material HSSE
Thread size M28x2
ChamferC (2–3) threads
Standard DIN 374
Technical data for the M28x2 blind hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M28x2 |
| Thread Pitch P | 2 mm |
| Helix Angle | 35° |
| Overall Length l1 | 140 mm |
| Flute Length l2 | 27 mm |
| Length l3 | 55 mm |
| Shank Diameter d2 | 20 mm |
| Square Drive Size a | 16 mm |
| Tap Drill Diameter | 26 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. Chips cut by the chamfer enter the flute, and the helix carries them upward like the auger in a meat grinder. The bottom of the hole stays clear, and the cutting edges do not encounter packed chips. The M28x2 tap has a reduced shank to DIN 374: diameter 20 mm, square drive 16 mm.
1
The 35° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
Feed 2 mm/rev, equal to the pitch of the M28x2 thread.
M28x2 spiral flute machine tap – for metric fine threads
The Fra M28x2 spiral flute machine tap from the metric fine thread series is designed for cutting intermediate-pitch threads in machine housings and steel structures. Made from HSSE steel with 5% cobalt, it provides a hardness of 65-67 HRC and high cutting edge heat resistance up to 650°C. The 35° spiral flute guarantees controlled chip evacuation when tapping deep blind holes. With its form C chamfer, the tool is particularly well suited to blind hole tapping close to the bottom of the hole. The 6H tolerance in accordance with DIN 374 meets industrial production requirements.
Key features of the M28x2 spiral flute machine tap
- Manufacturing precision to 6H tolerance guarantees dimensional repeatability and full thread interchangeability in series production of mechanical components
- Compliance with DIN 374 confirms quality and ensures standardized dimensions for metric fine threads compatible with European standards
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C without loss of the cutting edge's mechanical properties
- Compatibility with ER40 holders and tapping heads for CNC machining centers with synchronous tapping capability
- Designed for steel structures includes welded components, machine frames, load-bearing structures, and bolted connections with increased strength
- 35° spiral flutes ensure consistent chip evacuation when tapping blind holes up to 2.5D deep without the risk of breakage
The M28x2 spiral flute tap is well suited to maintenance departments for thread restoration and production machinery repairs. The fine pitch of 2 mm provides a larger contact area than the standard M28x3 thread. The tap drill diameter for the M28x2 thread is 26 mm according to metric fine thread tables.
Cutting data for the M28x2 blind hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 57-227 | 114-454 |
| MStainless steel | 5-10 | 57-114 | 114-228 |
| KCast iron | 5-15 | 57-171 | 114-342 |
| NAluminum | 10-25 | 114-284 | 228-568 |
Thread preparation M28x2 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 26 mm
3 Tapping
M28x2
✓ Done!
Tolerance 6H
Standard: DIN 374 | Chamfer: C (spiral flute) | Application: 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 M28x2 HSSE metric fine machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum, and brass. The intermediate pitch of 2 mm is used in steel structures requiring connections with increased strength.
For the M28x2 metric fine thread in tolerance class 6H, the recommended tap drill diameter is 26 mm. The hole tolerance zone should fall within the range of 26.0 to 26.2 mm. Exceeding the upper limit results in an incomplete thread profile.
Yes, cooling with an oil emulsion of at least 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling is required when machining stainless steels, while aluminum can be tapped with minimum quantity lubrication (MQL).
Product accessories
Machine Threader M28x2 DIN 374 C HSSE
Reference: 0000007156 In stock < 10 items
€47.37
€58.26 brutto
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| 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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