STAINLESS STEEL LEFT HAND THREAD HEXAGON THIN NUTS DIN 439

Left‑Hand Thread Hexagon Thin Nuts – FAQs

What is a left‑hand thread hexagon thin nut?

A left‑hand thread hexagon thin nut is a low‑profile (thin) hexagonal nut manufactured with a left‑handed internal thread. Unlike standard nuts, it tightens when turned anticlockwise and has a reduced height compared to a full hex nut. These nuts are typically manufactured to DIN 439 for thin hexagon nuts with left‑hand threads. 

When are left‑hand thread hexagon thin nuts used?

Left‑hand thread hexagon thin nuts are commonly used:

  • As a locking (jam) nut in conjunction with a left‑hand thread full nut
  • In assemblies where rotation or vibration would loosen a right‑hand thread
  • Where limited axial space prevents the use of a full‑height nut
  • On rotating components where the direction of rotation is known and fixed

They are typically used in light to medium‑duty locking or positioning applications rather than as a primary fastening solution.

Are left‑hand thread hexagon thin nuts suitable as a main fastening nut?

No. Due to their reduced height, left‑hand thread hexagon thin nuts are not intended to be used as the sole primary fastening nut in load‑bearing applications. They are best used as a secondary locking nut or where space constraints require a thin nut.

Can left‑hand thread thin nuts be used with standard bolts?

No. Left‑hand thread hexagon thin nuts must only be used with matching left‑hand threaded bolts or studs. They are not compatible with standard right‑hand threaded fasteners.

How can I identify a left‑hand thread thin nut?

Left‑hand thread hexagon thin nuts may be identified by:

  • Product descriptions or part numbers marked LH or left‑hand
  • Documentation specifying left‑hand thread
  • The tightening direction — anticlockwise rather than clockwise

If there is any doubt, thread direction should always be confirmed before installation.

What sizes and materials are available?

Our range of left‑hand thread hexagon thin nuts is supplied in:

  • Metric thread sizes
  • Stainless steel A2
  • Stainless steel A4

Availability of sizes may vary depending on material.

Are left‑hand thread hexagon thin nuts known by any other names?

Left‑hand thread hexagon thin nuts may also be referred to as:

  • Left‑hand jam nuts
  • Reverse‑thread thin hex nuts
  • Left‑hand half nuts

All refer to the same low‑profile hexagonal nut design with a left‑hand internal thread.

How do I choose the correct left‑hand thread hexagon thin nut?

When selecting a left‑hand thread hexagon thin nut, consider:

  • Correct left‑hand thread size and pitch to match the mating fastener
  • Available space and required nut thickness
  • Use as a locking nut, rather than a primary load‑bearing fastener
  • Material selection (A2 or A4) based on environmental conditions