Reamed hole bolt

Ordinary bolts can bear lateral and axial loads, but the lateral load bearing method is mainly based on the friction caused by the pre-tightening moment, while the reamed bolts can also bear lateral and axial loads. The lateral load bearing method is The shear strength of the bolt itself, its transverse bearing capacity is much higher than that of ordinary bolts, and the axial bearing capacity is the same as that of ordinary bolts.

Ordinary bolt

The diameter of the screw part of an ordinary bolt and the basic size of the hole are generally different, (generally the hole size is 0.5 to 1 mm larger than the bolt size), so it cannot be called a fit.It relies on the pre-tightening force of the bolt to prevent relative sliding and movement of the connected parts.When there is relative sliding between the connected parts, the pre-tightening force is converted into frictional force to prevent its movement, so a larger pre-tightening force is required.

Reamed hole bolt

Reamed hole bolt connection, the diameter of the screw part is the same as the basic size between the hole, it is a transition fit (not a clearance fit).When there is relative sliding between the connected parts, relying on the shearing effect of the bolt itself to prevent its movement, so only a small pre-tightening force is required.

German: die Passschraube close-fit bolts, reamed bolts

die Schraube bolt

Application example of reamed hole bolts: For structures that use friction to transmit force under vibration load conditions, reamed hole bolts should be used (to transmit force by the shape of the part).

Hangzhou Reamed Bolt　Hangzhou Reamed Bolt