Hexagon head screw DIN 933 ISO 4017, full thread, M 20x40, AF 30, plain steel 12.9

The hexagon head screw M 20x40 in plain steel with black finish, property class 12.9 joins components with a thread that reaches almost up to the head as specified in DIN 933. Load bearing thread is therefore available over the full length of 40 mm, which simplifies short clamping lengths and through bolted assemblies. Across the flats the head measures 30 mm at a head height of 12.5 mm.

Benefits

• Thread M 20 almost up to the head to DIN 933 and ISO 4017, load bearing over the length of 40 mm
• Plain surface without additional coating, the dimensions follow DIN 933 directly
• Hexagon head with 30 mm across flats to DIN and ISO for open end, ring and socket wrenches
• Short clamping lengths are possible because at 40 mm length no plain shank has to be allowed for
• Head height of 12.5 mm keeps the build height of the joint M 20x40 low

Applications

Machine and plant construction in dry surroundings, jig and tool making, bolting of gearbox and bearing housings, maintenance work on existing equipment.

Standards and conformity

Dimensions and thread design of size M 20x40 follow DIN 933 and ISO 4017. The width across flats amounts to 30 mm and is stated identically in DIN and ISO. The material is plain steel (black finish), property class 12.9.