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1. Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread [2] 2. Nuts with specified proof load values – Coarse thread [3] 3. Flat washers with specified property classes [4] 5. Set screws and similar threaded fasteners not under tensile stresses [5] [6] 6.
Coarse threads install much faster as they require fewer turns per unit length. Finer threads are stronger as they have a larger stress area for the same diameter thread. Fine threads are less likely to vibrate loose as they have a smaller helix angle and allow finer adjustment. Finer threads develop greater preload with less tightening torque. [5]
When a left hand turning motion is applied, the raised edge bites into the underside of the bolt or nut and the part that it is bolted to, thus resisting turning. Therefore, spring washers are ineffective on left hand threads and hardened surfaces [citation needed]. Also, they are not to be used in conjunction with a flat washer under the ...
An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. (Example: wood screws, tapping screws.) [ 59 ] This distinction is consistent with ASME B18.2.1 and some dictionary definitions for screw [ 60 ] [ 61 ] and bolt .
The term fine adjustment screw typically refers to screws with threads from 40–100 TPI (Threads Per Inch) (0.5 mm to 0.2 mm pitch) and ultra fine adjustment screw has been used to refer to 100–254 TPI (0.2 mm to 0.1 mm pitch). These screws are most frequently used in applications where the screw is used to control fine motion of an object.
Style 1 hexagon nuts with metric fine pitch thread; property classes 6 and 8: Withdrawn: DIN EN ISO 8673: ISO 8673: DIN 971-2: Style 2 hexagon nuts with metric fine pitch thread; property classes 10 and 12: Withdrawn: DIN EN ISO 8674: ISO 8674: DIN 972: M5 to M39 hexagon nuts; style 1; product grade C (modified version of ISO 4034) Withdrawn ...