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Description
Material HSSE
Thread size M3
ChamferB (3.5–5.5) threads
Standard DIN 371
Technical data for the M3 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M3 |
| Thread Pitch P | 0.5 mm |
| Overall Length l1 | 56 mm |
| Flute Length l2 | 10 mm |
| Length l3 | 18 mm |
| Shank Diameter d2 | 3.5 mm |
| Square Drive Size a | 2.7 mm |
| Tap Drill Diameter | 2.5 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 form B through-hole chamfer has a chip breaker at the front of the tap – an angled cut in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chip curls into a coil, breaks into short pieces, and exits the hole on the other side of the workpiece. Threads already cut remain clean because chips do not pass through them on their way up. The M3 x0.5 tap has a reinforced shank in accordance with DIN 371: diameter 3.5 mm, square 2.7 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 0.5 mm/rev, equal to the pitch of the M3 x0.5 thread.
M3 through-hole machine tap – cobalt HSSE DIN 371
The M3 through-hole machine tap is a professional tool for cutting internal M3 threads in through holes on CNC and conventional machine tools. Its HSSE high-speed steel construction with 5% cobalt provides a hardness of 65-67 HRC and high thermal resistance in the cutting zone up to 650°C. Size M3 is among the most popular metric threads used in electronics, precision engineering, and the automotive industry. The tool is intended for CNC operators, maintenance departments, and industrial toolrooms.
Key features of the M3 machine tap for through holes
- Popular M3 size is among the most commonly used metric threads in industrial electronics, precision engineering, and automotive manufacturing
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and thermal resistance up to 650°C, extending cutting edge life under intensive use
- Short shank in accordance with DIN 371 compatible with ER11 and ER16 collet chucks, collets, and tapping chucks with axial compensation
- Tolerance 6H according to DIN 371 ensures accurate threads and full interchangeability with standard-grade fasteners
- Material versatility covering structural steels up to 800 MPa, alloy steels, austenitic stainless steels, cast iron, and aluminum
- Metric pitch of 0.5 mm compliant with DIN 13 for M3 coarse threads, the recommended tap drill diameter is 2.5 mm
The M3 through-hole machine tap is used in series production of electronics, on assembly lines, and in maintenance departments for thread repair and restoration. Form B with straight flutes ensures efficient chip evacuation. The tool requires cooling with an oil emulsion at a minimum concentration of 6-8%.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 531-2122 | 266-1061 |
| MStainless steel | 5-10 | 531-1061 | 266-530 |
| KCast iron | 5-15 | 531-1592 | 266-796 |
| NAluminum | 10-25 | 1061-2653 | 530-1326 |
Thread preparation M3 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 2.5 mm
3 Tapping
M3
✓ Done!
Tolerance 6H
Standard: DIN 371 | 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 M3 HSSE tap performs well in structural steels up to 800 MPa, alloy steels, austenitic stainless steels 304/316, gray and ductile cast iron, aluminum, and brass.
The recommended tap drill diameter for the M3 coarse thread is 2.5 mm. Accurate hole preparation ensures a full thread profile and minimizes the load on the tap.
With proper cooling, the M3 HSSE tap cuts 400-600 threads in structural steel and 200-300 threads in stainless steel. Dry operation reduces tool life by 30-40%.
Product accessories
Hand tap M3 DIN 352/3 6H HSS Bucovice
Reference: 0000004910 In stock > 10 items
€5.53
€6.80 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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