The ingot nut is like an ingot, with a hole in the middle for fastening the bolt and wings-like protrusions on both sides, so that fingers can tighten the bolt with strength.

Five steps of ingot bolt assembly:

1. Remove burrs around bolt holes, and remove floating rust and oil stains on the board surface.

2. Check the drawings to ensure that the bolt specifications are correct.

3. Put the bolt into the bolt hole, and install the gasket and other parts as required before tightening the nut.

4. For a large number of bolts, first tighten the nuts in the specified order.

5. Re-screw in the specified order, and finally tighten the nut. Check with the drawings again.