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Description
Material HSS
Thread size M48
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M48 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M48 |
| Thread Pitch P | 5 mm |
| Overall Length l1 | 183 mm |
| Flute Length l2 | 65 mm |
| Shank Diameter d2 | 32 mm |
| Square Drive Width Across Flats a | 25 mm |
| Tap Drill Hole | 43 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M48 x5 thread is formed in the wall of a hole with a diameter of 43 mm. The thread groove extends 2.5 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 M48 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M48 x5 in five steps
ØDrilling
Drill bit 43 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 48 mm minus pitch 5 mm gives 43 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 72 mm, or 1.5 times the thread diameter (1.5 x 48 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 M48 screw.
M48 HSS hand tap – 3-piece set for large-diameter threads
The M48 HSS hand tap set is a professional set for cutting internal threads with a diameter of 48 mm. The 3-piece set contains a taper tap, a plug tap, and a bottoming tap, allowing large threads to be cut safely in structural steels, machinery steels, and cast iron.
Key benefits of the M48 hand tap set
- Large diameter of 48 mm – a solution for heavy machinery and industrial structures
- Compliance with ISO 529 – an international standard ensuring dimensional precision and manufacturing quality
- High-speed steel HSS 64 HRC – a durable material for machining steels with tensile strengths up to 800 MPa
- Tolerance 6H – a standard internal thread accuracy class for industrial connections
- Three-stage cutting – distributing cutting forces minimizes tool load and operator strain
M48 hand taps are essential tools in heavy industry, the energy sector, and machine building. The M48 tap set is chosen by professionals cutting threads in large structural components. Order the set and carry out the most demanding large-diameter 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 M48 thread with a standard pitch of 5 mm requires a hole diameter of 43 mm. Precise sizing is essential for a full thread profile.
An M48 tap requires a No. 5 or larger tap wrench with long handles. The large diameter requires substantial torque.
M48 threads are used in heavy industry, the energy sector, machine building, hydraulic power systems, and large steel structures.
Product accessories
Metal drill bit 43 NWKc HSS DIN 345 Baildon
Reference: 0433 In stock > 10 items
€94.74
€116.53 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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