Allstate Trailer Spares
Split Pins 4mm x 32mm — Suits 3/4″ Trailer Axles
Part No: R1321 | Barcode: 9343965000885 | Series: ASTSS Axle Accessories
Replacement split pins (cotter pins) sized 4mm x 32mm for securing castellated axle nuts on 3/4″ trailer axle stubs. Split pins are single-use safety hardware — always use a new pin when reassembling.
4mm x 32mm
Suits 3/4″ Axle
Safety Hardware
Key Features & Benefits
- Correct size for 3/4″ axles — 4mm diameter fits the split pin hole in standard 3/4″ UNF trailer axle stubs, and 32mm length provides enough material to bend securely.
- Single-use safety item — split pins work-harden when bent and must be replaced each time the axle nut is removed. Keep spares in your trailer toolkit.
- Prevents nut backing off — passes through the castellated nut slots and axle hole, physically locking the nut against rotation to prevent hub loss during towing.
When to Use These Pins
Use a fresh R1321 split pin every time you remove and retighten the axle nut during bearing service. Never reuse a split pin that has already been bent — the metal fatigues and may snap, allowing the nut to work loose and the hub to come off the axle.
Authorised Australian Dealer — This product is sourced directly from Allstate Tooling Solutions Australia and is backed by full Australian manufacturer warranty and local support.
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