J.Lanfranco Locknuts | Bossard Group

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J.Lanfranco Locknuts

The company J.Lanfranco was founded in 1974 and specializes in the production of high quality self-locking nuts. Key players from all industrial sectors rely on the Lanfranco quality, with the corresponding approvals in the respective field of application.

  • All-Metal Locknuts
  • Applications
  • Features
Lanfranco All-metal locknuts

All-metal locknuts from J.Lanfranco have no plastic inserts of any kind. They're effective under even the harshest conditions:

  • Extreme temperatures
  • Corrosive environments
  • High levels of vibration

Of special interest to many customers are the dual-slotted locknuts (ESL & ERM), which offer the highest performance possible with no bolt damage and no galling.


Lanfranco All-metal locknuts

J.Lanfranco has the most important approvals for the necessary product safety in the most advanced industrial sectors.

  • Automotive/bodywork
  • Plant and mechanical engineering
  • Vehicle substructure
  • Transportation plant construction
  • Rail vehicles/bogies
  • Aviation/shipping
  • Energy supply/power plant construction
  • Defense sector, etc.

Lanfranco All-metal locknuts
  • ESL: Dual-slotted, all-metal, self-locking hex nut. Characteristics: extremely reliable, consistent prevailing torque, and no galling
  • ERM: Time saver with its integrated disc spring washer. The result: quick installations and absolute tension maintained under dynamic loads
  • THU: Full-height, heavy hex industrial version of the ESL nut. Superior resistance to vibration, corrosion, and temperature in a robust industrial design
  • HCT: A reusable one-piece, full-height locknut ideal for high temperature areas
  • HCB: Single-slotted, extra low height, locking jam nut
  • GSL: An all-metal locknut to ISO 7042. Available in metric class 8, 10, 12 and stainless steel A2-70 & A4-80
  • HUS Starnut: A standard deformed thread locking nut. It’s also known as a “top locking” type nut.
  • SPR: An all-metal locknut consisting of a hex nut with a crimped, deflected metal ring
  • SRF: An all-metal flange locknut. Locking is achieved by deformation of the last thread. This is a top locking style nut.

  • Nylon Insert Locknuts
  • Applications
  • Features
Lanfranco Nylon insert locknuts

Self-locking hex nuts use a nylon ring to generate prevailing torque. It's also available with a high temperature nylon ring. J.Lanfraco offers a full line of metric nylon insert nuts as well as imperial NE, NU, NTU patterns in UNJC & UNJF thread form MIL-8879 or MIL-S-7742.

Lanfranco Nylon insert locknuts

J.Lanfranco has the most important approvals for the necessary product safety in the most advanced industrial sectors.

  • Automotive/bodywork
  • Plant and mechanical engineering
  • Vehicle substructure
  • Transportation plant construction
  • Rail vehicles/bogies
  • Aviation/shipping
  • Energy supply/power plant construction
  • Defense sector, etc.

Lanfranco Nylon insert locknuts
  • HMP ISO 10511: Low-height metric nylon insert locknut to ISO 10511
  • HUP ISO 7040: Nylon insert locknuts made to all major metric and imperial standards (ISO 7040, IFI 100/107). Available in carbon steel, stainless steel, and exotics. UNJC & UNJF threads are also available.
  • EUM: A nylon insert self-locking nut with a free spinning conical washer