Steel 10.9, 40Х, 30Х3МФ, 30Х2НМФА, 20Х2НМТРБ (hot-dip galvanizing, thermal diffusion galvanizing)
| d | M12 | M16 | M20 | M22 | М24 | М27 | М30 | М36 |
| P | 1,75 | 2 | 2,5 | 2,5 | 3 | 3 | 3,5 | 4 |
| r | 1,2 | 1,2 | 1,5 | 1,5 | 1,5 | 2 | 2 | 2 |
| k | 8 | 10 | 13 | 14 | 15 | 17 | 19 | 23 |
| S | 22 | 27 | 32 | 36 | 41 | 46 | 50 | 60 |
| e | 23,91 | 29,56 | 35,03 | 39,55 | 45,2 | 50,85 | 55,37 | 66,44 |
| b | 21 | 26 | 31 | 32 | 34 | 37 | 40 | 48 |
DIN 6914 high-strength bolt with increased turnkey size
For highly loaded connections of heavy metal structures, in such areas as construction, machine tool and instrumentation, industrial production, the most commonly used bolt is the high-strength bolt with an enlarged size DIN 6914. This is because connecting assemblies are often subjected to significant dynamic loads, and such bolts are indispensable for the installation of motor equipment, as they are able to withstand high pressure and high cyclic loads.
Due to the presence of a hexagonal head with an enlarged size specially designed for turnkey, these hardware products are successfully used in the assembly and repair of all types of equipment and complex machine tools as the main fastening element.
The main characteristics of this product that will help you choose and buy a quality product:
steel (strength class 10.9/12.9), stainless steel A2-A4 or brass
Coating: without / galvanizing / oxidation / thermal diffusion galvanizing
length of the finished product from 30 to 240 (mm)
thread diameter from M12 to M36
Depending on the material of manufacture, metal products of this configuration can be used in various applications. Brass bolts are known for their anti-corrosion properties, and due to their resistance to moisture and inability to conduct current, they are indispensable in agriculture and wet marine environments.
But in the food, chemical, and paper industries, where equipment connectors are often exposed to aggressive alkaline and acidic compounds, it is better to use A4 stainless steel products. As evidenced by customer reviews.
High-strength bolts DIN 6914 are used in combination with high-strength hexagonal nuts with an enlarged key size DIN 6915 (EN 14399-4), flat washers with beveled chamfer DIN 6916 (EN 14399-6) or flat washers DIN EN 14.
Analogs of DIN 6914:
GOST R 52644-2006 high-strength hexagonal head bolts with an enlarged size, turnkey, accuracy class C.
GOST 22353-77 high-strength bolts of accuracy class St.
EN 14399-4 high-strength HV bolts, with hexagonal nuts and washers.
ISO 7412 high-strength hexagon socket head bolts with an enlarged turnkey size (with a shortened threaded part) for construction joints, accuracy class C.
Marking
d – nominal thread diameter
P – threading step
r is the radius
k – height of the bolt head
S – size of the turnkey head
e – the diameter of the described circle, not less
b – length of the threaded journal
l – length of the bolt