What is the hole in this nut for?
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As shown in the figure, the hole in the nut is not through-going; what is the purpose of this small hole?
This must be a double-headed bolt; it’s used for prying the nut with a hydraulic puller, via the small hole therein.
Is this a reciprocating compressor rod screw? The function of turning the nut when applying hydraulic pressure.
For small screws, anti-loosening pins should be used; for large bolts, hydraulic stretchers are required. After stretching, these tools are used to remove the bolts. Comparing this to your foot, it seems like it’s a large bolt
Bolts can be pre-tightened in two ways: hot tightening and cold tightening; this is cold tightening! ! After stretching with the hydraulic tensioning tool, use a specialized tool to clamp the hole in the nut and tighten it. It is generally used in high-pressure vessels or large-scale units. :D
Nut for securing the hydraulic stretcher,
It’s the connecting rod bolt. When tightening the connecting rod cap, a hydraulic tensioner is used; the hole in the nut serves for tightening or loosening the bolt with the help of this hydraulic tensioner. Pay attention to the pre-tightening force and the duration of pressure application during the tightening process