Hex nuts and nylon-insert lock nuts
Grade 5 and Grade 8 finished hex nuts in zinc, plus nylon-insert lock nuts across the same range, #10 to 1 in. Grade 8 nuts have the corner marks and a thicker body; the grade is not optional information, because a nut is sized to strip before a bolt breaks only when the two match. Our nuts are stocked next to the screws they belong with, same finish, same grade, so a bag going out with Grade 8 yellow zinc screws leaves with Grade 8 yellow zinc nuts unless you ask otherwise.
Nylon-insert nuts hold on vibration, not on load. The insert grips the bolt threads with friction and keeps the nut from backing off a guard or a sheet metal joint. Reuse costs you prevailing torque every time, so after two or three removals it is a plain nut with a scuffed collar. Heat kills it faster: anywhere near an exhaust, a motor housing or a steam line, use a plain nut with threadlocker from assembly consumables instead.
Hot-dip galvanised bolts need nuts tapped oversize to clear the coating on the threads. A standard-tapped nut will not run on, and forcing it strips the zinc off the bolt and leaves a bare steel thread in a wet joint. Tell us if the bolt is galvanised and the matching nut comes tapped for it.
- Grades
- Grade 5, Grade 8, 18-8
- Types
- Finished hex, nylon-insert lock
- Sizes
- #10 to 1 in, UNC and UNF
- Finish
- Clear zinc, yellow zinc, plain, stainless
- Basis
- Per box of 100
Plug-gauged before bagging. If the go plug will not run on by hand, the lot does not go out.
