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Hand Tap M55X3 DIN 2181/2 HSS
023380
Thread size: M55x3172 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
€534.08 tax inc.
Net price: €434.21
Description
Technical data for the M55x3 hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M55 |
| Thread pitch P mm | 3 mm |
| Overall length l1 | 140 mm |
| Flute length l2 | 36 mm |
| Shank diameter d2 | 40 mm |
| Square drive size a | 32 mm |
| Tap drill diameter | 52 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 M55x3 thread is cut into the wall of a hole with a diameter of 52 mm. The thread groove extends 1.5 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 M55x3 hole – sequence 1, 2
Hand tapping step by step
Thread M55x3 in four steps
ØDrilling
Drill bit 52 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 55 mm minus pitch 3 mm gives 52 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 137.5 mm, or 2.5 times the thread diameter (2.5 x 55 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 M55x3 screw.
M55x3 fine-thread hand taps
Hand Tap M55x3 DIN 2181/2 HSS is a precision-manufactured tool designed for cutting metric fine threads in structural and alloy steels with tensile strengths up to eight hundred megapascals. High accuracy and process stability are ensured by M55x3 Hand Tap Set, whose appropriately matched taps ensure a smooth transition from the starting stage to the finishing stage, minimizing the risk of jamming and profile irregularities.
Specifications: nominal diameter fifty-five millimeters; pitch three millimeters; sixty° profile according to ISO 68-1; hole tolerance class 6H (ISO 965); right-hand direction; straight flutes for predictable chip evacuation. Precision-ground high-speed steel (HSS) maintains edge sharpness and reduces the risk of microchipping. The two-piece system according to DIN 2181/2 — starter tap (I) and finishing tap (II) — distributes torsional loads and supports axial alignment during tapping. Recommended tap drill: fifty-two millimeters; lubrication with emulsion or active cutting oil improves surface quality and extends tool life.
- Uniform guidance — the two-stage process limits torque fluctuations and ensures a stable thread profile.
- Cutting edge life — ground high-speed steel (HSS) maintains low microroughness and resistance to dulling even under heavy use.
- Fit accuracy — class 6H ensures proper fit with class 6g external threads, eliminating the risk of assembly play.
- Quality control — geometry and dimensions can be verified with GO/NO-GO gauges, maintaining full compliance with ISO standards.
Compliance with DIN 2181/2 (design), ISO 68-1 (metric profile), and ISO 965 (6H tolerance) ensures full compatibility with inspection gauges. In one-off and short-run production, high dimensional repeatability and thread profile stability are provided by M55x3 Hand Tap Set, maintaining consistent quality throughout the machining process.
Stages of cutting an M55x3 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.
Drill to 52 mm (diameter 55 mm minus pitch 3 mm) to achieve the correct thread engagement in class 6H.
High-speed steel (HSS) provides high durability, abrasion resistance, and stable operation even under demanding conditions.
Product accessories
Tapered countersink 63/90 DIN 335 B HSS
Reference: 096382 In stock < 10 items
€128.95
€158.61 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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