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Description
Material HSS
Thread size M45
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M45 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M45 |
| Thread Pitch P | 4.5 mm |
| Overall Length l1 | 183 mm |
| Flute Length l2 | 67 mm |
| Shank Diameter d2 | 31.5 mm |
| Square Drive Width Across Flats a | 24.6 mm |
| Tap Drill Hole | 40.5 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M45 x4.5 thread is formed in the wall of a hole with a diameter of 40.5 mm. The thread groove extends 2.25 mm into the wall. A single tap would have to cut the entire groove at once – by hand, this creates high resistance and a risk of breakage. The set divides this work into three layers.
The drawing shows the entire set in operation. All three taps have the same shank and the same length. They differ in chamfer length: No. 1 has a taper spanning 7–10 threads, while No. 3 spans only 1–2 threads. The detail views at the hole wall show how the thread groove deepens after each tap.
| Tap | Chamfer | Material removed | How it works in the hole |
|---|---|---|---|
| No. 1 – roughing tap | long, 7–10 threads | approx. 60% | enters smoothly and establishes thread alignment |
| No. 2 – intermediate | medium, 3–5 threads | approx. 30% | screws into the previously cut threads and starts cutting only deeper in the hole |
| No. 3 – finishing tap | short, 1–2 threads | approx. 10% + sizing | turns easily and produces the full 6H profile |
How to identify the tap numbers in the set
The chamfer is the tapered end of the tap. No. 1 has the longest chamfer and No. 3 the shortest – the difference is immediately visible when they are placed side by side. No. 1 and No. 2 have shallower thread profiles; only No. 3 has the full profile. The number can also be identified on the shank: No. 1 has one ring, No. 2 has two, and No. 3 has none. Keep the set together and always start with the roughing tap.
How to tap an M45 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M45 x4.5 in five steps
ØDrilling
Drill bit 40.5 mm
1Roughing tap
Removes approx. 60%
2Intermediate
Removes approx. 30%
3Finishing tap
Removes approx. 10%
✓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 45 mm minus pitch 4.5 mm gives 40.5 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 67.5 mm, or 1.5 times the thread diameter (1.5 x 45 mm, shown as 1.5D in the drawing). Drill the hole deeper than the thread. The clearance below the thread accommodates chips and the finishing tap chamfer.
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 and No. 3 – deepening and full profile
Unscrew the roughing tap and remove chips from the hole. Screw the intermediate tap by hand into the previously cut threads – it should engage them naturally. It turns easily at first and starts cutting only deeper in the hole. The finishing tap enters with almost no resistance and cuts the final portion of the profile only at the end. When it screws smoothly all the way in, the thread is ready – check it with an M45 screw.
M45 HSS hand tap – 3-piece set for large-diameter threads
The M45 HSS hand tap set is a professional set for producing internal threads with a diameter of 45 mm. The M45 tap set contains three tools – a taper tap, a plug tap, and a bottoming tap – essential for precisely cutting large threads in steel structural and machinery components.
Main advantages of the M45 hand tap set
- Large diameter of 45 mm – designed for heavy industrial and machinery structures
- ISO 529 standard – an international standard ensuring dimensional precision and consistent quality
- High-speed steel HSS 64 HRC – a durable material for cutting structural steels with tensile strengths up to 800 MPa
- Thread tolerance 6H – a standard accuracy class for connections in heavy industry and the energy sector
- Three-stage cutting process – distributing cutting forces across three stages protects the tool and reduces effort
M45 hand taps are used in heavy industry, machine building, and steel structures. The M45 tap set is chosen by professionals carrying out projects requiring large thread diameters. Order the set and tackle the most demanding industrial tapping tasks.
Tolerance 6H — metric thread tolerance classes
| Class | Accuracy | Application | Status |
|---|---|---|---|
| 4H / 4g | High | Precision connections, hydraulics | — |
| 6H / 6g | Standard | Machine building, general-purpose | SELECTED |
| 7H / 8g | Low | Large clearance, easy assembly | — |
6H = internal thread (nut, hole) | 6g = external thread (screw)
Frequently asked questions
An M45 thread with a standard pitch of 4.5 mm requires a hole diameter of 40.5 mm. A precise hole ensures a full thread profile.
An M45 tap requires a No. 5 tap wrench with long handles. The high torque may require two-person operation.
M45 threads are used in hydraulic power systems, heavy machinery manufacturing, the energy sector, mining, and steel structures.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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