Hexagon head bolt DIN 931 / ISO 4014, M 20x70, hexagon 30 mm, shank 24 mm, steel 8.8, zinc-plated

Large flanges and steelwork transfer their loads through a small number of heavy bolts. This hexagon head bolt M 20x70 to DIN 931 brings a shank of 24 mm and a thread of 46 mm for that purpose. The head is 12.5 mm high and measures 30 mm across flats, so a torque wrench has a safe grip. The material is steel of property class 8.8 with an electroplated zinc coating.

Advantages

• Thread length of 46 mm to DIN 931, sufficient for a nut and a washer in size M 20.
• Plain shank of 24 mm within 70 mm of total length, which places the shear plane in the full shank cross section instead of the thread.
• Head height of 12.5 mm keeps the overall height of the joint low.
• Hexagon head with 30 mm across flats, so the tightening torque can be applied with an ordinary open-ended or ring spanner.
• Steel of property class 8.8 with an electroplated zinc coating, so the joint stays releasable in dry and occasionally damp surroundings.

Applications

Flange joints in machine building where the 24 mm shank aligns the parts against each other. Bolting of bearing blocks and brackets with a through hole in size M 20. Building of fixtures and clamping plates where the head with 30 mm across flats must stay freely accessible. Releasable joints that are opened several times for maintenance.

Standards and conformity

The bolt is dimensioned to DIN 931 and ISO 4014. The width across flats is 30 mm to DIN 931 and 30 mm to ISO 4014. The material is steel of property class 8.8 with an electroplated zinc coating.