About

A Nyloc (nylon insert) Nut is a torque prevailing nut, which uses a plastic / nylon insert located toward the top of the nut reducing its inner diameter, which then deforms over the mating thread, capturing the bolt or screw providing a locking feature causing resistance or prevailing torque keeping the nut locked in position and resistant to vibration.  This design feature of the Nyloc (Nylon Insert) nut means that the screw threads do not cause damage to the plastic / nylon section allowing the nut to be re-used, although the locking feature will deteriorate after persistent re-use.

The Nyloc (nylon insert) nut is an economic locking nut and is ideal in applications where vibration or motion could loosen or undo the nut.  The Nyloc (nylon insert) nut can also be used to assist sealing the bolt thread against seepage of oil, water, petrol, paraffin and other liquids.

Nyloc (nylon insert) nuts can be used in environments with relatively high temperatures where they can retain their locking ability up to 121°C. 
The Nyloc nut is available in a variety of materials and finishes.

Din 985 Type T Nyloc (nylon insert) Nuts are available in Grade 8, 10 & 12:
Metric Thread - M2 - M56
BA Thread 6BA - 2B
BSW Thread 3/16" - 2 ½"
BSF ¼" - 3"
UNC 4-10 - 1 ½"
UNF 10-32 - 1 ½"

Din 982 Type P Nyloc (nylon insert) Nuts are available in Grade 8, 10 & 12:
Metric Thread M5 - M30
BA Thread 6BA - 2B
BSW Thread 3/16" - 2 ½"
BSF ¼" - 2 3/8"
UNC 6-32 - 1"
UNF 10-32 - 1 ½"

Certain sizes also available in brass

Video

Technical Drawing