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Machine tap M20x1.25 DIN 374 B HSSE
0000007207
Thread size: M20x1,2561 sizes of this tap
M5x0,5M10x1M10x1,25M11x0,75M12x1M12x1,25M12x1,5M14x1M14x1,25M14x1,5M15x1M15x1,25M15x1,5M16x1M16x1,5M17x1M18x1M18x1,5M18x2M20x0,75M20x1M20x1,25M20x1,5M20x2M22x1,5M22x2M24x1M24x1,5M24x2M25x1M25x1,5M25x2M26x1,5M27x1,5M28x1,5M30x1,5M30x2M30x3M32x1M32x1,5M32x2M33x1,5M33x2M35x1,5M36x1,5M36x2M36x3M38x1,5M39x1,5M39x2M40x1,5M42x1,5M42x2M42x3M48x1,5M50x2M52x2M56x3M60x3M64x3M64x4
€40.46 tax inc.
Net price: €32.89
Description
Material HSSE
Thread size M20x1.25
ChamferB (3.5–5.5) threads
Standard DIN 374
Technical data for the M20x1.25 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M20x1.25 |
| Thread Pitch P | 1.25 mm |
| Overall Length l1 | 125 mm |
| Flute Length l2 | 24 mm |
| Shank Diameter d2 | 16 mm |
| Square Drive Size a | 12 mm |
| Tap Drill Diameter | 18.75 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 chamfer for through holes has a chip breaker at the tip of the tap – an angled cut in the cutting edges. The chip breaker directs the chip 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. The threads already cut remain clean because the chip does not pass through them on its way up. The M20x1.25 tap has a reduced shank according to DIN 374: diameter 16 mm, square size 12 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 1.25 mm/rev, equal to the pitch of the M20x1.25 thread.
M20x1.25 fine thread machine tap – HSSE for industrial hydraulics
The M20x1.25 machine tap for metric fine threads is designed for precision tapping of holes in industrial hydraulic components. Made from HSSE high-speed steel with 5% cobalt, it guarantees a hardness of 65-67 HRC and optimum durability when machining materials with a tensile strength up to 800 MPa. The M20x1.25 metric fine thread offers a balance between adjustment precision and assembly speed, providing twice the positioning accuracy of the M20x2.5 coarse thread. The 6H tolerance in accordance with DIN 374 guarantees the dimensional repeatability required in series production.
Technical specifications of the M20x1.25 metric fine thread machine tap
- Fine thread with a 1.25 mm pitch provides twice the adjustment precision of a coarse thread while maintaining fast assembly and good strength
- Increased load-bearing area of the thread of the fine thread results in more uniform load distribution and greater fatigue resistance in dynamically loaded connections
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and thermal resistance up to 650°C required when machining alloy and stainless steels
- Compliance with DIN 374 confirms manufacturing quality and ensures standardized dimensions for metric fine threads
- Compatibility with ER32 holders and collets for precision clamping on CNC machining centers with axial compensation
- Recommended tap drill diameter 18.7 mm for the M20x1.25 metric fine thread ensures optimal thread engagement
The M20x1.25 machine tap for metric fine threads is used in the production of valve blocks, pump housings, and hydraulic cylinders where connection tightness and precision are required. A metric fine thread provides better sealing than a coarse thread due to the greater number of threads per unit length. Cooling with an emulsion containing EP additives 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 | 80-318 | 100-398 |
| MStainless steel | 5-10 | 80-159 | 100-199 |
| KCast iron | 5-15 | 80-239 | 100-299 |
| NAluminum | 10-25 | 159-398 | 199-498 |
Thread preparation M20x1.25 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 18.75 mm
3 Tapping
M20x1.25
✓ Done!
Tolerance 6H
Standard: DIN 374 | 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 M20x1.25 metric fine thread provides better sealing of hydraulic connections due to the greater number of threads, higher resistance to loosening under pressure, and more precise adjustment of actuators.
The recommended tap drill diameter for the M20x1.25 metric fine thread is 18.7 mm. Precise hole machining is essential for leak-tight hydraulic connections.
Yes, the M20x1.25 metric fine thread requires bolts and nuts with the same pitch. Fasteners with a coarse pitch of 2.5 mm are not compatible with the metric fine thread.
Product accessories
Machine Tapping M20x1.25 DIN 374 C HSSE
Reference: 0000005574 In stock > 10 items
€38.16
€46.93 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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