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Hand Tap M68X2 ISO 529/2 6H HSS
555678
Thread size: M68x2172 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
€582.63 tax inc.
Net price: €473.68
Description
Technical data for the M68x2 hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M68 |
| Thread pitch P mm | 2 mm |
| Overall length l1 | 197 mm |
| Flute length l2 | 48 mm |
| Shank diameter d2 | 45 mm |
| Square drive size a | 35 mm |
| Tap drill diameter | 66 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 M68x2 thread is cut into the wall of a hole with a diameter of 66 mm. The thread groove extends 1 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 M68x2 hole – sequence 1, 2
Hand tapping step by step
Thread M68x2 in four steps
ØDrilling
Drill bit 66 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 68 mm minus pitch 2 mm gives 66 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 170 mm, or 2.5 times the thread diameter (2.5 x 68 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 M68x2 screw.
M68x2 fine-thread hand taps
Hand Tap M68x2 ISO 529/2 6H HSS is designed to produce precision metric threads with a diameter of sixty-eight millimeters and a pitch of two millimeters. It is suitable for machining structural steels, metal alloys, and materials with a hardness of up to eight hundred megapascals, ensuring a clean profile and dimensional repeatability in manual and assembly operations.
Technical specifications: nominal diameter 68 mm, pitch 2 mm, sixty° thread profile per ISO 68-1, internal thread tolerance class 6H in accordance with ISO 965, right-hand. Straight flutes ensure controlled chip evacuation and reduced friction. Precision-ground high-speed steel (HSS) construction reduces microcracking and ensures cutting edge durability. The two-piece arrangement per ISO 529/2 — a starter tap (I) and a finishing tap (II) — stabilizes the process and balances torque. Recommended drill diameter: 66 mm; lubrication with emulsion or active cutting oil improves surface quality and extends cutting edge life.
- Operating efficiency — precise guidance and repeatable machining stages are supported by M68x2 Hand Tap Set, making it easier to maintain axial alignment and a clean profile.
- Uniform thread formation — dividing the work into two stages produces a uniform thread profile without jamming or deformation.
- Long cutting edge life — ground high-speed steel (HSS) maintains low surface roughness and reduces cutting edge wear.
- 6H fit accuracy — maintaining the effective diameter ensures successful GO / NO-GO inspection.
Reference to ISO 529/2, ISO 68-1, and ISO 965 ensures full compatibility with inspection instruments and stable thread geometry. In workshop practice, highly predictable results and smooth operation are enabled by M68x2 Hand Tap Set, which ensures consistency between the thread starting and finishing stages.
Stages of cutting an M68x2 thread with a 2-piece set: roughing tap and finishing tap
Frequently asked questions
High-speed steel (HSS) provides high durability, abrasion resistance, and stable operation even under demanding conditions.
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 66 mm (diameter 68 mm minus pitch 2 mm) to achieve the correct thread engagement in 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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