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Hand Tap M12X0.75 LH DIN 2181/2 HSS Fra
13163
Thread size: M12x0,7542 sizes of this tap
€30.75 tax inc.
Net price: €25.00
Description
Technical data for the M12x0.75 left-hand hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M12 |
| Thread pitch P mm | 0.75 mm |
| Overall length l1 | 70 mm |
| Flute length l2 | 18 mm |
| Shank diameter d2 | 9 mm |
| Square drive size a | 7 mm |
| Tap drill diameter | 11.25 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 M12x0.75 LH thread is cut into the wall of a hole with a diameter of 11.25 mm. The thread groove extends 0.375 mm into the wall. A single tap would have to cut the entire groove at once — by hand, this means high resistance and a risk of 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 M12x0.75 LH hole – sequence 1, 2
Hand tapping step by step
Thread M12x0.75 LH in four steps
ØDrilling
Drill bit 11.25 mm
1Roughing tap
Chamfer 8 threads
2Finishing tap
Chamfer 2 threads
✓Finished thread
Tolerance 6H
Turning sequence: half a turn counterclockwise, a quarter turn clockwise | Between taps: remove chips from the hole
Start with the hole. The drill diameter is easy to calculate: thread diameter 12 mm minus pitch 0.75 mm gives 11.25 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 30 mm, or 2.5 times the thread diameter (2.5 x 12 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 into a tap wrench and position it perpendicular to the surface. Check the angle from two sides, for example with a square. This is a left-hand thread, so turn in the opposite direction to usual: half a turn counterclockwise, then a quarter turn clockwise. 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
Unscrew the roughing tap and remove chips from the hole. Screw the finishing tap by hand into the cut threads — it should engage them naturally. Continue with the same turning sequence as for the roughing tap. The finishing tap removes the remaining material and cuts the groove to its full profile within 6H tolerance. Once it screws smoothly all the way in, the thread is complete — check it with an M12x0.75 LH screw.
Left-hand metric fine hand taps M12x0.75
M12x0.75 left-hand hand taps DIN 2181 HSS are designed to cut left-hand metric fine threads with a pitch of 0.75 mm. The M12x0.75 left-hand tap set consists of two parts – a roughing tap and a finishing tap – which, when used in sequence, allow the thread to be cut in stages to produce a complete, precise profile.
The M12x0.75 left-hand hand tap set is made of high-speed steel (HSS), providing high wear resistance and long tool life. M12x0.75 left-hand hand taps are used for machining low-carbon steel, aluminum alloys, brass, and other metals with good machinability, while their left-hand direction makes them useful in connections requiring opposite thread directions.
The M12x0.75 left-hand hand tap set meets the requirements of DIN 2181, and the finished thread conforms to tolerance class 6H (ISO 2). It can be used in both through and blind holes. A tap wrench secured to the square drive is used during operation, providing stable guidance and full process control.
Key features:
- M12x0.75 left-hand tap set– the set includes a roughing tap and a finishing tap.
- HSS high-speed steel – durability and abrasion resistance.
- Versatile applications – use in through holes and blind holes.
Stages of cutting an M12x0.75 left-hand thread with a 2-piece set: roughing tap and finishing tap
Frequently asked questions
LH indicates a left-hand thread, which is cut in the opposite direction to a standard right-hand thread.
The set contains two taps – a roughing tap for initial cutting and a finishing tap for producing the final thread form.
Yes, the set is designed for both through and blind holes.
HSS M12x0.75 left-hand taps perform well in low-carbon steel, aluminum, brass, and other free-machining materials.
Product accessories
Tapered countersink 16.5/90 DIN 335 C HSS
Reference: 11247 In stock > 10 items
€9.74
€11.98 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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