Technical information
Rolling of screw thread
For the production of our screw threads, we mainly use the thread roll system (chipless cold forming).
How does it work?
The input material has a diameter equal to the flank diameter of the thread (the measure that shows the centre of the thread turn). Thus, by indenting a half thread plastically, the material can be pushed outward. This increases the diameter of the thread and the latter increases without forming chips.
Here it is necessary to use drawn steel. As not all steel types are in stock in great quantities, we use the following types: 4.8, 5.8 and sometimes 8.8. For RVS this is AISI 304 and AISI 316.
The table hereunder gives an overview of the used diameters for the production of threads.
THREAD | FLANK DIAMETER | WEIGHT/M |
M 6 x 1 | 5,25 | 0,17 |
M 8 x 1,25 | 7,10 | 0,33 |
M10 x 1,5 | 8,90 | 0,50 |
M 12 x 1,75 | 10,75 | 0,75 |
M 14 x 2 | 12,60 | 1,00 |
M 16 x 2 | 14,60 | 1,32 |
M 18 x 2.5 | 16.25 | 1.65 |
M 20 X 2.5 | 18.25 | 2.10 |
M 22 x 2.5 | 20.25 | 2.55 |
M 24 x 3 | 21,90 | 3,00 |
M 27 x 3 | 24,90 | 3,80 |
M 30 x 3,5 | 27,60 | 4,80 |
M 33 x 3,5 | 30,60 | 5,75 |
M 36 x 4 | 33,25 | 6,70 |
M 39 x 4 | 36,25 | 8,10 |
M 42 x 4.5 | 38,90 | 9,40 |
M 45 x 4,5 | 41,90 | 10,80 |
M 48 x 5 | 44,60 | 12,40 |
M 52 x5 | 48,60 | 14,70 |
M 56 x 5,5 | 52,25 | 16,80 |
M 60 x 5,5 | 56,25 | 19,50 |
M 64 x 6 | 59,90 | 22,10 |
Cold forming without chipping
In case of cold forming without chips, the material of the product is plastically and durably formed by pressure. When rolling a profile, the material structure is not cut, like in chipping operations, but only relocated.
Advantages of thread rolling
Hereunder you find an overview of the many advantages of cold forming without chipping
Economic advantages:
- Extremely short operation time;
- Less material is required because the end diameter of the material to be operated is equal to the flank diameter and not to the external diameter of the thread.
Technical advantages:
- High precision of the profile and of the pitch of the thread, whereby the pitch cannot drift because the thread is rolled by means of fixed moulds;
- The thread has a high resistance;
- Under pressure mirror smooth polished threads;
- Great wear resistance and corrosion resistance;
- The rolling process creates a pressure system in the thread core which allows to produce the greatest reinforcement there. This significantly increases the carrying capacity in comparison with cut thread.
DIN 3570 and Standard
U-brackets according to DIN 3570 and standard versions in sizes M6x3/8” to M24x24” are always available. U-brackets are offered in electrolytic or galvanized steel, but also in RVS A2 or A4. For U-brackets that deviate from these sizes (till M36) you can call on our customisation.
Surface treatment
At Merofix, materials can obtain different surface treatments:
- Electrolytic galvanized according to EN-ISO-4042
- Thermic galvanized (hot dip) according to EN-ISO-1461
- Iso-appropriate or oversized
Our quality
- EURO Norm: S235JR C+C (St37.2 k). Drawn steel
- DIN Norm: Din 17100/1652
- WN: 1.0037.
- Ordinary soft steel according to DIN 17100/1652, drawn on h9. Is extremely suitable for the production of mechanic pieces with little charge.
- This material is used for sizes M6 to M64 included.
- EURO Norm: S355J2 C+C (St52.3 k). Drawn steel.
- DIN Norm: Din 17100/1652
- WN: 1.0570.
- Steel according to DIN 17100/1652, drawn on h9. Is extremely suitable for the production of mechanic pieces.
- This material is used for sizes M10 to M64 included.
- High quality steel, that meets the requirements for 8.8-quality.
- For this material we have possibilities for the sizes M16 to M36 included.
- Minimum requirements:
- Tensile strength 830 N/mm²
- Min. Melting point: 660 N/mm²
- Minimum elongation 12 %
- W.N.: 1.4301.
- Most used RVS for general applications.
- Ideal application for fixings in normal atmospheric circumstances.
- We can offer this material for sizes from M6 to M24 included.
- W.N.: 1.4404.
- Significantly more corrosion resistant than AISI 304. Is used there, where AISI is not sufficiently corrosion resistant.
- Ideal application for fixings in aggressive surroundings, such as maritime climate, industrial atmosphere, oxidizing acids.
- We can offer this material for sizes from M6 to M24 included.
DO YOU WANT SOME MORE TECHNICAL INFORMATION?
Or do you have a specific question?
Do not hesitate to contact us, it will be our pleasure to help you further.
