Why Milenco Locking Wheel Bolts – Motorhome 15" (Set of 4, M14) for Fiat Ducato / Peugeot Boxer Non-Maxi – Thatcham Approved (1915) is Essential for Caravan Security

Fiat Ducato and Peugeot Boxer motorhomes use different bolt sizes depending on the wheel size and chassis, which makes it easy to order the wrong locking wheel bolts by mistake. The Milenco Locking Wheel Bolts (Set of 4, M14) are Thatcham and insurance approved, and — like Milenco's other locking bolts — designed to resist the “hammer-on socket” method thieves use to remove standard locking nuts.

Compatibility

This M14 set fits Fiat Ducato / Peugeot Boxer motorhomes with 15" wheels built between 2007 and 2015, and all non-Maxi chassis models (whether 15" or 16" wheels) from 2016 onwards.

Choosing the right size

Milenco's guidance is to measure your existing bolt diameter before ordering: M14 is this set (product code 1915), while M16 needs product code 1922 (Set of 4) or 1939 (Set of 6). As a rule of thumb, Maxi (heavy-duty) chassis typically use M16, while Standard chassis typically use M14 — but Milenco recommends confirming directly: on pre-2018 vehicles by checking wheel size, and on post-2018 vehicles by confirming Maxi vs Standard and the actual bolt diameter, rather than going by year alone.

What's included

The set comes with four bolts and one key — worth recording your key number once fitted in case a replacement is ever needed.