What does m5-6h mean?
2 Answers
M5 refers to a standard thread with a nominal diameter of 5, representing a right-handed internal thread with a 6H tolerance. Here, 6 denotes IT6, and H indicates the fundamental deviation for holes, where both the pitch diameter and minor diameter tolerance grades are 6H. Below is additional information: Wheel Hub Nuts: Wheel hub nuts are specialized nuts used to secure the outer wheel hub of a vehicle. Due to the variability in automotive nuts, there is no unified national standard for them. However, their general specifications are similar to those of standard hex nuts, typically ranging from M12 to M42. Thread Pitch: Wheel hub nuts are generally thicker than standard hex nuts of the same size and usually feature fine threads. The thread pitch is typically either 1.5 mm or 2.0 mm. The shape is an equilateral hexagon, similar to standard hex nuts, but one end often has a taper. Inside this taper, there may be a step designed to hold a nylon washer for locking purposes.
This issue has been discussed several times in the car owner groups. The M5-6h notation most commonly appears on the gearshift indicators, especially for automatic transmission models with manual mode. For example, several cars I've driven display something like M5-6 on the dashboard when in manual mode - the 'h' probably stands for 'high', indicating the high-speed gear range. During normal driving, 6th gear is indeed mainly used for highway cruising with lower RPMs for better fuel efficiency. However, different manufacturers use slightly different notations - last time I drove my friend's domestic car, it showed M6H. I recommend paying attention to the dashboard display during gear changes next time, and also checking the gear explanation section in your vehicle's manual, which usually includes illustrative diagrams.
