Quick Summary
The ONIPAX Bike Seatpost Lock M6x45mm Tamper-Resistant Security Bolt is a bike seatpost security bolt with an M6x45mm size. It is described as a tamper-resistant replacement for a standard seatpost clamp bolt, with a proprietary 7-lobe security design and a matching ONIPAX key.
For buyers comparing seatpost security hardware, the main points are the bolt size, the security-drive type and whether the fitting matches the seatpost clamp on the bike.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Product type | Bike seatpost lock / security bolt for replacing a standard seatpost clamp bolt. |
| Size | M6x45mm, so the fitting size needs to match the seatpost clamp setup. |
| Security design | Proprietary 7-lobe security drive, intended to require the matching ONIPAX key. |
| Construction | Cr-Mo steel axle with an aluminium alloy nut. |
| Included tool | A specialised tool is mentioned for installation. |
What to Compare Before Buying
- Fit: Check that the M6x45mm size matches the seatpost clamp on your bike.
- Security drive: Compare the 7-lobe security design with the tools you already use and the key supplied for this bolt.
- Replacement job: This is for swapping a vulnerable quick-release style fixing for a tamper-resistant bolt, so it suits buyers looking for that type of change.
- Installation: The bolt is intended to be fitted with the matching tool, so confirm you are happy replacing the existing clamp hardware.
What Else You May Need
You need the correct seatpost clamp setup for the M6x45mm bolt size. Keep the matching ONIPAX key with the bike after fitting.
Before You Decide
Confirm the M6x45mm size matches your seatpost clamp before choosing an offer. Also check that you want a tamper-resistant replacement bolt rather than a quick-release fixing, and keep the matching key in a safe place after installation.









