Heart & Industry

Home · Big Bear Bolts

1/4 X 1-1/4 UNC Countersunk Socket Set Screw Self Colour 10.9 High Tensile DIN7991 PK10

1/4 X 1-1/4 UNC Countersunk Socket Set Screw Self Colour 10.9 High Tensile DIN7991 PK10

Big Bear Bolts

£12

Countersunk and non-countersunk refers to the style of a screw's head. Countersunk is a head style that features tapering, thereby allowing it to be driven deeper into a workpiece's surface. Non-countersunk is a head style without tapering, resulting in the protrusion of the head. Property Class 10.9 bolts and screws have a minimum tensile strength of 1040 MPa for all sizes. Property Class 10.9 Bolts are considered high-strength parts . DIN7991

Big Bear Bolts's own words, read from their page.

Buy from BIG BEAR BOLTS LTDBIG BEAR BOLTS LTD is a UK retailer, not the maker. Price seen 2026-09-26. Not an affiliate link, we earn nothing from it.

Where this comes from

The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.