Hexagon head screw DIN 933 ISO 4017, full thread, M 20x55, AF 30, plain steel 10.9

With thread M 20 and a length of 55 mm this screw covers joints where the hexagon head is reached with a wrench from the side. The width across flats of 30 mm follows DIN 933 and the material is plain steel (black finish) of property class 10.9.

Benefits

• Thread almost up to the head to DIN 933 and ISO 4017, load bearing thread over the full length of 55 mm
• Hexagon head with 30 mm across the flats for open end, ring and socket wrenches
• Property class 10.9 for joints loaded beyond what class 8.8 allows
• Plain surface without an added layer, so the dimensions match DIN 933 directly
• Head height of 12.5 mm limits the build height of the joint
• Metric coarse thread M 20, matching nuts and tapped holes are standardised and widely available

Applications

Machinery and plant construction in dry environments, jig and tool making, mounting of gearboxes and bearing housings, maintenance of existing equipment.

Standards and conformity

Dimensions and thread version follow DIN 933 and ISO 4017. The width across flats is 30 mm to DIN and 30 mm to ISO. The material is plain steel (black finish) of property class 10.9.