Description:

Nylock is short for Nylon Insert Lock Nut.  It has a nylon piece pressed into the top of it that serves to hold the nut in place.  As it is tightened onto a bolt, the bolt cuts threads into the nylon.  The nylon fits securely around the bolt threads but does not deform them.  The inserts come in a variety of colors but that in no way affects the grade of the nut.

Material:

• Steel
• Stainless Steel
• Aluminum
• Brass

Grades:

• Grade 2, Low Carbon
• Grade 5
• Grade 8
• 18-8 Stainless
• 316 Stainless
  

Markings:

• Grade 2 – No markings
• Grade 5 – 2 or more dots, dashes or other markings on non-consecutive corners of either the top or bottom of the nut – OR – 1 cut mark across each point on the sides of the nut.
• Grade 8 – 2 or more dots, dashes or other markings on consecutive corners of either the top or bottom of the nut – OR – 2 cut marks across each point on the sides of the nut.

Plating:

• No Plating/Plain (Plain Steel)
• Zinc (Blue or Yellow)

How to measure:

Thread size, Across flats (ACF)

Application:

Because the thermoplastic is soft (compared to metal) this is an excellent choice in applications where there may be a lot of vibration.   Since it contains thermoplastic this is not a good choice in high temperatures as it could melt.

Abbreviation/ Jargon:

• Lock nut
• Nylon nut
• Nylock

Part number prefix:

• 0NY* (Steel)
• 1NY* (Stainless Steel)
• 2NY* (Brass)
• 3NY* (Aluminium)

Style/ types:

• Standard
• Jam
• Heavy Hex