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Hand Tap M18X1.25 DIN2181/2 6H HSS
0000008843
Thread size: M18x1,25172 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
€27.51 tax inc.
Net price: €22.37
Description
Technical data for the M18x1.25 hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M18 |
| Thread pitch P mm | 1.25 mm |
| Overall length l1 | 80 mm |
| Flute length l2 | 22 mm |
| Shank diameter d2 | 14 mm |
| Square drive size a | 11 mm |
| Tap drill diameter | 16.75 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 M18x1.25 thread is cut into the wall of a hole with a diameter of 16.75 mm. The thread groove extends 0.625 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 M18x1.25 hole – sequence 1, 2
Hand tapping step by step
Thread M18x1.25 in four steps
ØDrilling
Drill bit 16.75 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 18 mm minus pitch 1.25 mm gives 16.75 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 45 mm, or 2.5 times the thread diameter (2.5 x 18 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 M18x1.25 screw.
M18x1.25 fine-thread hand taps
Hand Tap M18x1.25 DIN 2181/2 6H HSS is designed for cutting M18 fine threads in structural steels, stainless steels, and nonferrous materials with a hardness of up to eight hundred megapascals. Its high manufacturing accuracy and stable guidance produce a clean, repeatable thread profile in one-off and small-batch machining.
Technical data: nominal diameter eighteen millimeters, pitch 1.25 millimeters, sixty° profile per ISO 68-1, internal thread tolerance 6H per ISO 965, right-hand. Straight flutes promote controlled chip evacuation, while ground high-speed steel (HSS) ensures cutting edge durability and wear resistance. The two-part design in accordance with DIN 2181/2 — starter (I) and finisher (II) — ensures even distribution of torsional loads and precise axial guidance. In industrial practice, smooth processing and correct transitions between operating stages are supported by M18x1.25 Hand Tap Set.
- Stable geometry — the two-stage operating sequence ensures smooth thread cutting and reduces the risk of jamming.
- Cutting edge life — precision-ground HSS reduces microcracking and extends service life.
- Fit accuracy — the 6H tolerance enables an ideal fit with class 6g external threads.
- Operating efficiency — in workshop applications, sequential machining is facilitated by M18x1.25 Hand Tap Set, ensuring repeatable results and an orderly operating sequence.
Compliance with DIN 2181/2 (construction), ISO 68-1 (thread profile), and ISO 965 (tolerance class 6H) ensures compatibility with inspection gauges and stable profile geometry. The M18x1.25 hand tap is well suited to precision assembly, one-off production, and workshops requiring dimensional accuracy and a clean thread finish.
Stages of cutting an M18x1.25 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.
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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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