Cup Square Bolts

Product Info

Cup Head Square Necked Bolts are available to BS.4933 and are normally threaded to the square. Head styles such as Countersunk Cup Nibbed, etc., can also be supplied. The Bolts can be supplied either with or without Hexagon Nuts. Please refer to the "Silo Bolts".

Materials & Finishes

Cup Square bolts are available in standard Mild Steels or Carbon Steels with Boron suitably heat treated for higher tensile requirements. Various finishes can be added from the standard self colour, examples being zinc plate and colour passivations, galvanised, etc.


Used in a wide variety of industries for fixing steel and wood fabrications.

Stock Sizes

M5 to M16 Dimensions as well as their imperial equivalents.


Our manufacturing plant is capable of producing cup square bolts to your drawings, in non standard lengths, as well as to other National or European Standards and stocking them for your call off instructions.


The Cup Square Bolts are packed into polypropylene bags ready for immediate dispatch.

A division of Clevedon Fasteners Limited