Square Head Machine Bolts

How to use it correctly?

The correct use of Square head machine bolts lie in choosing the right specifications, following the installation procedures precisely, achieving accurate torque, and ensuring reliable anti-loosening.

（1）Step 1: Insert the bolt

Insert the Square head machine bolts through the unthreaded side of the workpiece, ensuring that the head is tightly against the surface of the workpiece.

（2）Step 2: Place the gasket (if necessary)

Flat washer: Used to distribute the pressure of the nut and protect the surface of the workpiece.

Spring washer: Used in vibration environments, it provides a locking function.

Conical gasket: Used for inclined surfaces or in situations requiring elastic compensation.

（3）Step 3: Pre-tighten the nut

Turn the nut in by hand a few times to ensure that the threads are properly aligned.

If it is difficult to screw the nut in, check whether the thread is damaged or if foreign objects are mixed in.

（4）Step 4: Symmetrical and stepwise tightening

A torque wrench must be used.

（5）Step 5: Final Tightening

After the initial tightening is completed, re-tighten once again according to the target torque value to ensure the accuracy of the torque.

Product maintenance

Systematic maintenance of Square head machine bolts can effectively extend their service life and ensure the safety of the equipment. The key to the maintenance lies in the five major steps of "inspection, cleaning, lubrication, tightening, and rust prevention".

（1）Regular inspection

Conduct daily or regular visual inspections of the bolt condition, with particular attention to the threads, head, and surface for any rust or deformation.

（2）Cleaning and Lubrication

Cleaning: Use a damp cloth soaked in soapy water for cleaning.

Lubrication: It is recommended to apply a small amount of lubricating grease before use.

（3）Re-tightening and torque check

Re-tightening for new parts: After installation, it is recommended to re-tighten once using a torque wrench at the specified value after approximately 10 hours of operation.

（4）Rust treatment and anti-corrosion

Rust treatment: For mild rust, use a steel wire brush or rust remover combined with sandpaper for grinding. For severe rust, it needs to be replaced and coated with anti-rust agent.

Daily rust prevention: Non-stainless Square head machine bolts are prone to rust. If not galvanized, you can apply anti-rust oil. Galvanized products have better corrosion resistance. Even when left unused for a long time, additional anti-rust oil application is necessary.

（5）Storage and Protection

Environmental requirements: Store in a dry and cool place, and avoid direct sunlight.

Storage condition: The factory-installed anti-rust oil serves as protection for the bolts. Do not clean them at will.

Picking principle: Only take out the quantity that will be used immediately.