Shear Nuts and Shear Bolts

Shear Nuts / Security Nuts

Shear Bolts / Security Bolts

The principle of the shearbolt is identical to that of the nut. Shear bolts are manufactured to order in button head and countersunk patterns

Permafix shear nuts and shear bolts are are designed to provide a permanent one way fixing. They are installed using standard tooling (e.g. spanner, socket set, etc.). When the nut or bolt is fully tightened, the hexagonal drive head is designed to shear off as additional torque is applied, leaving the shear bolt or the threaded conical lower collar of the shear nut in position on the standard bolt or stud thread, thus making these products permanent fixings.

When the drive flange of the shear nut shears off, only the threaded conical fixing remains in place. This offers a high security fixing as the cone shaped nut is designed to prevent any purchase point thus making removal very difficult.

Shear nuts are available from stock as indicated below - box quantity 100

Thread Size	Shear Torque	Finish
		BZP	Galvanised Mild Steel	A2 Stainless Steel
M6	5-9 lb/ft7-14mm
M8	10-15 lb/ft14-20mm
M10	23-28 lb/ft31-38mm
M12	38-44 lb/ft52-60mm
M16	54-60 lb/ft74-82mm
M20	72-82 lb/ft100-113mm

	Selected shear nut types / sizes available to buy on-line

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