Keszoox
Left Hand Thread DIN6923 304 Stainless Steel Hex Serrated Flange Lock Nut M4–M12
Left Hand Thread DIN6923 304 Stainless Steel Hex Serrated Flange Lock Nut M4–M12
Regular price
$4.10 USD
Sale price
$4.10 USD
Unit price
per
Taxes included.
Shipping calculated at checkout.
Couldn't load pickup availability
Left Hand Thread DIN6923 304 Stainless Steel Hex Serrated Flange Lock Nut — M4–M12
Left hand thread DIN6923 stainless steel hex serrated flange lock nuts are specified wherever a standard right-hand thread nut would loosen due to counter-clockwise rotation of the mating shaft or component. The reverse (left-hand) thread tightens as the shaft rotates counter-clockwise, providing self-tightening anti-loosening performance in rotating machinery, motor shafts, and bicycle pedals. The integrated serrated flange provides additional anti-rotation grip on the mating surface.
Key Specifications
| Parameter | Value |
|---|---|
| Material | 304 Stainless Steel |
| Grade | A2 |
| Standard | DIN6923 (left hand thread variant) |
| Thread Direction | Left hand (LH) — tightens counter-clockwise |
| Thread Type | Metric coarse (left hand pitch) |
| Size Range | M4, M5, M6, M8, M10, M12 |
| Flange | Integrated serrated (anti-loosening) |
Why Choose Left Hand Thread Flange Lock Nuts?
- Left hand thread — tightens counter-clockwise; self-tightening on shafts that rotate counter-clockwise (left-hand side of rotating machinery)
- Serrated flange — additional mechanical anti-loosening on top of left-hand thread’s inherent self-tightening; double protection against loosening
- 304 A2 stainless — corrosion-resistant for outdoor, marine, and industrial rotating machinery
- DIN6923 standard — internationally specified flange nut geometry; compatible with left-hand thread bolts and studs of the same pitch
- M4–M12 range — covers the most common rotating machinery and motor shaft sizes
Typical Applications
- Electric motor shaft retention (left-hand side of motor — counter-clockwise rotation)
- Bicycle left pedal thread (standard left-hand thread on left crank arm)
- Angle grinder and power tool spindle lock nuts (left-hand thread standard)
- Lathe and CNC spindle chuck retention (left-hand thread on left-hand spindle)
- Fan and propeller shaft retention on counter-clockwise rotating shafts
- Automotive wheel bearing and hub retention (left-hand thread on left-side wheels, some vehicles)
Compatible With
- Left hand thread metric bolts and studs M4–M12 (LH designation)
- Left hand thread threaded rod M4–M12
- Spanner / socket: M4=7mm, M5=8mm, M6=10mm, M8=13mm, M10=17mm, M12=19mm AF
- Note: NOT compatible with standard right-hand thread bolts — verify thread direction before ordering
Package Contents
- Left hand thread DIN6923 hex serrated flange lock nuts in selected size and quantity (per variant)
Frequently Asked Questions
- Q: How do I identify a left hand thread nut?
- A: Left hand thread nuts are typically marked with “LH” or a groove/notch on the hex flats. When viewed from the threaded end, a left-hand thread spirals clockwise (opposite to standard right-hand thread). To tighten, turn counter-clockwise; to loosen, turn clockwise — the opposite of a standard nut.
- Q: Why does my bicycle left pedal use a left-hand thread?
- A: The left pedal uses a left-hand thread so that the pedalling motion (which rotates the crank counter-clockwise when viewed from the left side) self-tightens the pedal rather than loosening it. This is a universal standard on all bicycles.
- Q: Can I use a left-hand thread nut on a right-hand thread bolt?
- A: No. Left-hand and right-hand thread nuts are not interchangeable. Attempting to thread a LH nut onto a RH bolt will cross-thread and damage both components. Always verify thread direction before installation.
