DIN 558 Full-Thread Bolt

The European standard DIN 558 covers steel hex head bolts with full metric thread. These fasteners are used together with nuts and washers of matching diameter and serve to connect components of various machines and mechanisms. This is one of the most widespread types of fasteners: a simple design and high strength make it a versatile solution for fastening various elements and structures.

Manufacturing features

DIN 558 covers structural steel bolts with thread diameter from M5 to M24; the length of the fully threaded shank ranges from 10 to 100 mm. The hex head is convenient for tightening with a wrench of the corresponding size. The structural bolt can be installed into a pre-threaded hole or into an unthreaded hole, secured with a nut and washer.

The standard allows the following materials for manufacturing this type of fastener:

• Plain (uncoated) steel, property class 3.6 or 4.6. These fasteners are not designed for very high loads.
• Polymer materials. Polymer fasteners are used in environments with increased corrosive activity.
• Zinc-plated steel. Zinc plating significantly increases the corrosion resistance of the fastener. The coating can be applied by electroplating or thermal diffusion galvanizing.

When selecting fasteners, the application conditions must be taken into account. Zinc-plated, stainless, and polymer bolts can be used outdoors, as well as in conditions of increased humidity or acidity. An additional large-diameter washer allows the bolt to be used for fastening thin-sheet materials.

Applications

DIN 558 fasteners are used for fastening machine and mechanism components, and for securing various parts in unloaded connections. They are widely used in mechanical engineering, instrument-making, machine-tool building, and other industrial sectors, as well as in construction, furniture manufacturing, and beyond.

Equivalent fasteners are manufactured to ISO 4018, DIN 931, as well as the Russian standard GOST 15589-70. When selecting equivalents, the permissible product grade must be taken into account.

Dimensions of DIN 558 hex head full-thread bolts, mm:

k	3.5	4	5.3	6.4	7.5	10	12.5	15
s	8	10	13	16	18	24	30	36
L	d
	M5	M6	M8	M10	M12	M16	M20	M24
10
16
20
25
30
35
40
45
50
60
70
80
90
100