Nuts
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Frequently asked questions
Which nut property class goes with an 8.8 bolt?
Under ISO 898-2, a class 8 nut pairs with an 8.8 bolt and a class 10 nut with a 10.9 bolt. A lower-class nut may strip its threads before the bolt reaches design load. A higher-class nut is always acceptable.
What temperature can nylon insert lock nuts handle?
Nylon insert nuts (ISO 7040, DIN 985) are typically limited to about 120 degrees C; above that the nylon softens and loses locking. Near furnaces, exhausts or hot molds, use all-metal prevailing torque nuts. Nylon inserts also lose effectiveness after several reuse cycles.
Can a flange nut replace a washer?
An integral flange spreads clamp load over a wider area, so a flat washer is often unnecessary. Serrated flanges also resist rotation but will scratch paint or plating on the clamped surface. For oversized holes or soft materials, a wide washer is still advisable.
Do left-hand thread nuts need to be ordered separately?
Yes, specify left-hand thread explicitly since the nut looks almost identical to a right-hand one. Left-hand threads appear on rotating shafts where rotation would loosen a right-hand thread, such as grinding wheels and some pulleys. They are sometimes marked with a groove or LH.
How do all-metal lock nuts differ from nylon insert nuts?
All-metal prevailing-torque nuts, for example ISO 7042, get their locking from a deformed thread section, so they tolerate far higher temperatures than a nylon ring. In return they cause more thread wear during assembly and lose locking torque after a few uses. They suit areas near engines, ovens or solvents.
Can nylon insert lock nuts be reused?
The nylon ring's locking torque drops with each removal, so nylon nuts are recommended for single use in critical joints. If reused, check that the nut still has noticeable resistance when turned by hand. Joints exposed to vibration or tied to safety should get new nuts.
When are weld nuts used?
Weld nuts have projections or a pilot to be projection or spot welded onto thin sheet, giving a strong thread where the sheet is too thin to tap. They are common in electrical cabinet frames, vehicle frames and pressed steel structures. The nut material must suit the welding process, typically plain low-carbon steel.
Where are fine pitch nuts used?
Fine pitch threads, such as M12x1.25 instead of M12x1.75, have a larger stress area and a smaller helix angle, so they resist self-loosening better. They are common on shafts, bearing assemblies, automotive parts and fine adjustments. The downside is that the threads damage more easily when dirty or cross-threaded, and the pitch must be stated precisely when ordering.
