What size are transit bolts?
Most transit bolts used to secure a washing machine drum during transport are standard M8 bolts, typically about 40–50 mm long with a 1.25 mm thread pitch. However sizes vary by model and brand, so always confirm with your manual or by measuring the bolts on your machine.
What transit bolts do and why they matter
Transit bolts (also called freight bolts) are shipped with many front- and top-loading washing machines to lock the drum in place during transit. They prevent the drum from banging against the chassis and protect bearings and seals. When you install the machine, these bolts are removed and usually replaced by the rear panel or anti-tip hardware.
Common sizes you’ll encounter
Below is a guide to typical sizes, with a caveat that models vary. Always verify with your manual or the bolts you have installed.
- Most common: M8 bolts — 8 mm diameter, thread pitch typically 1.25 mm, length around 40–50 mm.
- Less common: M6 bolts — 6 mm diameter, similar lengths on some smaller or older machines.
- Occasionally: M10 bolts — 10 mm diameter, longer variants up to about 60 mm on heavier models.
Length and engagement should be sufficient to reach securely into the frame without bottoming out, and the thread must match the mounting holes on the drum frame.
How to identify the correct size for your machine
Check the user manual or the rear labeling for the exact bolt specification. If you have the removed bolts, measure their diameter with a caliper or ruler and confirm the thread pitch by counting threads per millimeter or by comparing with a known M8/M6/M10 bolt. When in doubt, contact the manufacturer or a parts supplier with your model number.
When to remove transit bolts and what to use instead
After installation, transit bolts are removed to allow normal operation. Do not run the machine with transit bolts in place, as they can strain the drum and bearings. If you need to move the machine again, you’ll reinsert the bolts for the trip, then remove them again for use.
Summary
Transit bolts are most commonly M8 in modern washing machines, but you may encounter M6 or M10 on certain models. Always verify against your model’s documentation or the bolts themselves, and ensure the length and thread pitch are appropriate for secure mounting without interfering with the drum or frame. Proper identification helps protect the machine during transport and installation.
