Hobson AS 1390 Cup Head Bolt & Nut, M20 / 180

The Hobson cup head bolt & nut is a domed-head bolt supplied with its nut, in class 4.6 UTS with a plain finish. A cup head bolt has a smooth domed head with no drive, so it is tightened from the nut end. Cup head bolts are normally made with a square section under the head that holds the bolt in place while the nut turns.

Class 4.6 is low tensile carbon steel, and corresponds to imperial grade 2. These bolts are Class 4.6 UTS. UTS is a tensile strength abbreviation. The product name for this range refers to AS 1390.

Where this product is used

• Fixing parts together through a drilled hole, with the nut tightened on the side away from the head
• Joints where a smooth domed head is wanted on the visible face
• Replacing a cup head bolt of the same thread, length and finish

Features

• 25 items: M12 x 70mm to M20 x 200mm
• Domed cup head, supplied with nut
• Class 4.6 UTS strength level
• Plain finish
• AS 1390 named for this product

Key specifications

Choosing the right option

Choose the thread size first, then the length: the bolt has to pass through all the parts, any washer and the nut.

Related cup head bolts: Hobson Cup Head Bolt & Nut, Class 4.6 UTS, Zinc Plated, M6 to M12, Hobson Cup Head Bolt & Nut, Class 4.6 UTS, Hot Dip Galvanised, M6 to M24, Long Lengths and Hobson Metric Cup Head Bolt & Nut, Grade 4.6, Mild Steel, Zinc, M6 to M12.