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Hand Tap M25X1 DIN-2181/2 6H HSS
5100
Thread size: M25x1172 sizes of this tap
M1x0,2M1,2x0,2M1,4x0,2M1,6x0,2M1,7x0,2M1,8x0,2M2x0,25M2,2x0,25M2,2x0,35M2,3x0,25M2,3x0,35M2,5x0,35M3x0,35M3,5x0,35M4x0,5M4,5x0,5M5x0,5M5,5x0,5M6x0,5M6x0,75M7x0,5M7x0,75M8x0,5M8x0,75M8x1M9x0,5M9x0,75M9x1M10x0,5M10x0,75M10x1M10x1,25M11x0,75M11x1M11x1,25M12x0,5M12x0,75M12x1M12x1,25M12x1,5M13x1M13x1,25M14x0,75M14x1M14x1,25M14x1,5M15x1M15x1,5M16x0,75M16x1M16x1,25M16x1,5M17x1M17x1,5M17x2M18x0,75M18x1M18x1,25M18x1,5M18x2M19x1M19x1,5M20x0,75M20x1M20x1,25M20x1,5M20x2M21x1,5M22x1M22x1,25M22x1,5M22x1,75M22x2M24x1M24x1,5M24x2M25x1M25x1,5M25x2M26x1M26x1,25M26x1,5M26x2M27x1M27x1,5M27x2M28x1M28x1,5M28x2M30x1M30x1,5M30x2M30x2,5M30x3M32x1,5M32x2M32x3M33x1,5M33x2M33x3M34x1,5M34x2M35x1,5M36x1M36x1,5M36x2M36x3M38x1,5M38x2M38x3M39x1M39x1,5M39x2M39x3M40x1,5M40x2M40x3M42x1,5M42x2M42x3M42x4M45x1,5M45x2M45x3M45x4M46x1,5M46x2M48x1,5M48x2M48x3M48x4M50x1,5M50x2M50x3M52x1M52x1,5M52x2M52x3M52x4M55x2M55x3M56x1,5M56x2M56x3M56x4M58x2M58x4M60x1,5M60x2M60x3M62x1,5M62x2M62x3M62x4M64z1,5M64x2M65x2M65x4M68x1,5M68x2M68x3M68x4M70x1,5M70x2M72x1,5M72x4M75x1,5M75x2M76x1,5M80x1,5M85x2M90x2
€58.26 tax inc.
Net price: €47.37
Description
Technical data for the M25x1 hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M25 |
| Thread pitch P mm | 1 mm |
| Overall length l1 | 120 mm |
| Flute length l2 | 35 mm |
| Shank diameter d2 | 18 mm |
| Square drive size a | 14 mm |
| Tap drill diameter | 24 mm |
| Thread angle G | 60° |
| Tap tolerance | ISO2 6H |
Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
The M25x1 thread is cut into the wall of a hole with a diameter of 24 mm. The thread groove extends 0.5 mm into the wall. A single tap would have to cut the entire groove at once, requiring substantial hand torque and risking breakage. The set divides this work into two passes.
The drawing shows the entire set in operation. Both taps have the same shank and the same length. They differ in their chamfer, the tapered tip: No. 1 has a chamfer spanning 8 threads, while No. 2 spans only 2 threads. The detail windows at the hole wall show how the thread groove deepens after each tap.
| Tap | Chamfer | Chamfer angle | Material removed | How it works in the hole |
|---|---|---|---|---|
| No. 1 – roughing tap | long, 8 threads | 5° | the main portion of the groove | enters smoothly and establishes thread alignment |
| No. 2 – finishing tap | short, 2 threads | 20° | the remainder, to the full profile | follows the cut threads and produces the full 6H profile |
How to distinguish the taps in the set
The chamfer on No. 1 is 4 times as long as the chamfer on No. 2 — the difference is immediately visible when you place them side by side. No. 1 has an incomplete thread profile; only No. 2 has the full profile. The number is also indicated on the shank: No. 1 has one ring, No. 2 has none. Keep the set together and always start with the roughing tap.
How to tap an M25x1 hole – sequence 1, 2
Hand tapping step by step
Thread M25x1 in four steps
ØDrilling
Drill bit 24 mm
1Roughing tap
Chamfer 8 threads
2Finishing tap
Chamfer 2 threads
✓Finished thread
Tolerance 6H
Turning sequence: half a turn clockwise, a quarter turn counterclockwise | Between taps: remove chips from the hole
Start with the hole. The drill diameter is easy to calculate: thread diameter 25 mm minus pitch 1 mm gives 24 mm. An undersized hole is a common cause of a tap twisting off in the workpiece.
Through hole or blind hole – how deep to drill
The set taps both types of holes. In a through hole, the thread extends through the full material thickness. In a blind hole, cut the thread to 62.5 mm, or 2.5 times the thread diameter (2.5 x 25 mm, shown as 2.5D in the drawing). Drill the hole deeper than the thread. The finishing tap has a chamfer spanning 2 threads, so approx. 2 incomplete threads remain near the bottom. The extra depth below the thread accommodates them along with the chips.
No. 1 – the roughing tap establishes thread alignment
Fit the roughing tap in the tap wrench and position it perpendicular to the surface. Check the angle from two sides, for example with a square. Turn half a turn clockwise, then a quarter turn counterclockwise. Reversing breaks the chip into short pieces – a slight crunch is normal. The first threads determine whether the thread will be straight.
No. 2 – the finishing tap produces the full profile
Back out the roughing tap and remove chips from the hole. Screw the finishing tap into the cut threads by hand – it should engage them on its own. Continue turning at the same rhythm as with the roughing tap. The finishing tap removes the remaining material and cuts the groove to the full profile within tolerance 6H. When it screws in smoothly all the way, the thread is complete – check it with an M25x1 screw.
M25x1 fine-thread hand taps
M25X1 Hand Tap DIN-2181/2 6H HSS is used in workshop machining and assembly operations to produce metric fine threads; for size M25x1, it maintains axial alignment, a 60° profile, and internal thread tolerance class 6H in structural steels and cast iron.
Design specifications: size M25, pitch P=1; right-hand; ground high-speed steel (HSS); straight flutes for controlled chip evacuation; progressive chamfer for easier entry; straight shank with a square drive for use with a tap wrench; recommended drill diameter 24.0 mm for proper thread profile development and stable guidance, including in blind holes.
- Repeatable fit — The 6H internal thread mates with 6g threads, maintaining nominal clearance and a clean joint profile.
- Pass efficiency — M25x1 hand tap set speeds up the transition from roughing to finishing without losing axial alignment.
- Load control — The progressive chamfer and light beveling reduce torque and stabilize the entry zone.
- Surface quality — The ground cutting edge and straight flutes promote low surface roughness and reduce burr formation.
Applicable standards: ISO 68-1 (60° profile), ISO 261/262 (series and pitches), ISO 965 — class 6H for internal threads; construction is defined by DIN 2181/2. M25x1 hand tap set DIN-2181/2 6H HSS ensures repeatable thread geometry and consistent results in precision assembly and one-off machining.
Stages of cutting an M25x1 thread with a 2-piece set: roughing tap and finishing tap
Frequently asked questions
The set consists of two taps — a roughing tap and a finishing tap, which guarantee a fully formed thread when used in sequence.
High-speed steel (HSS) provides high durability, abrasion resistance, and stable operation even under demanding conditions.
Yes, the set can be used in both through holes and blind holes, in accordance with DIN 2181 and class 6H.
Product accessories
Metal drill bit 24 NWKc HSS DIN 345 Baildon
Reference: 0381 In stock > 10 items
€25.79
€31.72 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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