Hex Lock Nuts

A Hex Lock nut is a type of fastener with a threaded hole. Nuts are almost always used with a mating bolt to fasten multiple parts together. HV Nuts are one of the most common nuts available and are used with anchors, bolts, screws, studs, threaded rods and on any other fastener that has machine screw threads. Hex is short for hexagon, which means they have six sides. Hex Lock nuts are also known as: HLN.

Threads are standard right-hand and unified inch coarse series (UNC, Unified National Coarse) or Unified inch fine (UNF, Unified National Fine). Also metric thread with Right & Left-hand threaded hex nuts are also available.

We manufacture M16 to M72 & 1/2” to 3”.

To ensure full thread engagement with the hex nut, bolts/screws should be long enough to allow at least two full threads to extend beyond the nut face after tightening. Conversely, there should be two full threads exposed on the head side of the nut to make sure the nut can be properly tightened.

Lock nuts can be very difficult to remove. A lock nut will not loosen, even under intense vibrations. They are different on each side, making them very difficult to get off. Lock nuts come in various sizes for many different applications and are most often used by mechanics and engineers to hold wheels in place

Hex Lock Nut Grades

These Nuts are manufactured by us in carbon steel and stainless steel. Popular carbon steel grades include 8, 10, , 2HM, 8, 8M, SS316, SS304, SS316L, SS316S31 etc. The requirements for these are mentioned in the American standard A 194 and A 3506-2.


We can offer surface finishing as per customer requirement in hot dip galvanising, we take special care to ensure there is no hydrogen embrittlement in 10.9 grade with our special curing system which ensures that 10.9 grade bolts are not damaged by hydrogen embrittlement post galvanising process. We also do zinc electroplated in blue, yellow or black colour as per customer requirements.

Special coatings in specific industries require zinc flake coatings, these coatings are done as per ISO 10683, depending upon customers requirement for salt spray life we offer coating systems from NOF Japan and Doerken from Germany, these coatings are provided with the help and support of our partners who have the required licence and have successfully done validations with our existing customers. Salt spray life can vary from 500 to 1500 hours.

Black oxide or black coating is a general type of coating offered on bolts & nuts & stud bolts to give a pleasant appearance and to prevent any rusting during transportation or storage, the normal salt spray life for the fasteners applied with such coatings is often less than 100 hours

Xylan is a brand name of With fort USA and is a special coating applied on fasteners / stud bolts where extreme temperatures and harsh condition exist. The Highlights of this coating is that it gives

  • Low friction CoF as low as 0.02.
  • High corrosion and chemical resistance in most environments including marine and Oil & Gas
  • "Wide temperature operating range: from -420° to +550°F (-250° to 285°C)"
  • "Wide color range: color-code your product"
  • Machinability: apply multiple coats of Xylan coating (most formulations) and mill to specification
  • Wear resistance is very high, even under extreme pressures.
  • Weather resistance: against sunlight, salt water and road chemicals
  • Flexible curing schedule: ambient to 750°F (400°C).
  • Pliability: Many Xylan coatings will bend freely and repeatedly without breaking.
  • "Salt spray SST life: above 1000 hrs."

Lock nuts are generally used when the screw joint consists of one or more soft metals. It's difficult to achieve a high level of clamping load because the soft metal as it deforms due to high surface pressure. This plastic deformation continues after the torque value has been applied to the screw. So to provide better grip and tightening, sometimes lock nuts are used.


Our company also manufacturers low carbon nuts in M-16 to M72 & 1/2” to 3” in plain, zinc plated and hot dip galvanized finish, we are exporting these Nuts to many countries like USA, Europe and middle east. We also distribute and market the following products in alloy steel, carbon steel and stainless steel grades for the following products in DIN 439 & DIN 936.

Hex Lock Nuts