Polski 
- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
Material HSS
Thread size M8
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M8 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M8 |
| Thread Pitch P | 1.25 mm |
| Overall Length l1 | 63 mm |
| Flute Length l2 | 20 mm |
| Shank Diameter d2 | 6 mm |
| Square Drive Width Across Flats a | 4.9 mm |
| Tap Drill Hole | 6.8 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M8 x1.25 thread is formed in the wall of a hole with a diameter of 6.8 mm. The thread groove extends 0.6 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 M8 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M8 x1.25 in five steps
ØDrilling
Drill bit 6.8 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 8 mm minus pitch 1.25 mm gives 6.75 mm — in practice, use a 6.8 mm drill bit. 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 12 mm, or 1.5 times the thread diameter (1.5 x 8 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 M8 screw.
M8 HSS hand tap DIN 352 – professional 3-piece Varel set
The M8 hand tap set is a complete set of three tools for precision cutting of internal threads with a diameter of 8 mm and a pitch of 1.25 mm. M8 HSS hand taps are suitable for machine shops, maintenance departments, and repair facilities where control over the tapping process matters.
Key advantages of the M8 hand tap set
- 3-piece set (roughing, intermediate, and finishing taps) – progressive cutting reduces cutting resistance and extends tool life by up to 40% compared with 2-piece sets
- HSS high-speed steel – enables machining of materials with tensile strengths up to 800 MPa, including carbon steels, cast iron, and aluminum
- Tolerance class 6H in accordance with DIN 352 – guarantees a precise fit with screws in tolerance class 6g without the need for additional sizing
- Universal application – for through holes and blind holes in structural steels, brass, bronze, and plastics
- Square shank – compatible with standard tap wrenches
The 3-piece M8 hand tap set is suitable for engine component assembly in the automotive industry, work on steel structures in construction, and precision engineering. The manufacturer Varel supplies tools of consistent quality, valued by professionals. For proper tapping, use a drill bit with a diameter of 6.8 mm and tapping oil.
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
A 6.8 mm drill bit is used for an M8 thread with a pitch of 1.25 mm. Calculation: subtract the pitch from the thread diameter (8 - 1.25 = 6.75 mm, in practice 6.8 mm).
The HSS tool is designed for carbon and structural steels with tensile strengths not exceeding 800 MPa. It can also machine cast iron, aluminum, brass, bronze, and plastics.
The 3-piece version divides the process into three stages: roughing tap, intermediate tap, and finishing tap. This division reduces cutting forces and extends tool life by approximately 40%.
HSS can machine only soft grades of stainless steel. For acid-resistant materials (INOX), HSSE taps containing 5% cobalt are a better choice.
Frequently asked questions
Use a 6.8 mm drill bit for an M8 thread with a pitch of 1.25 mm. Formula: diameter minus pitch (8 - 1.25 = 6.75 mm, rounded to 6.8 mm).
The M8 thread offers a good balance between strength and size. It is standard in automotive applications, industrial electronics, and machinery.
Start with the roughing tap (1 ring), then use the intermediate tap (2 rings), and finish with the finishing tap (3 rings). Reverse each tool every half turn.
Product accessories
Reviews
No customer reviews for the moment.
Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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 |
Recommended for you
Viewed products
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.