What are the general specifications for U-bolts?How to repair U-bolt?This is the specification and maintenance item of U-bolt. I hope it will be helpful to you.

Specifications for U type bolts

M18 U bolts are nuts with M18.Most U-bolts are made of round steel with a diameter of 16.M20 U bolt is a nut with M20, mainly with 18 round steel processing;And M22 U bolts are made of M22 nuts and 20 round rods.These specifications are commonly used, the dimensions are generally: 600mm high, 200mm internal space, total length: 1400mm;The height is 400mm, the interior space is 200mm, and the total length is 1000mm.Of course, the size of U bolt can be processed according to customer requirements, customized processing.

U-bolts usually need to be equipped with 2 nuts, washers, corner struts or caps or washers.This is a set of U-bolts.The U-bolt gasket has a waist hole to facilitate the use of U-type clamps and improve working efficiency.

Repair and maintenance of U bolt

1. During the secondary maintenance of 12000 km, the oil pan should be disassembled and the working condition of the bearing bushing should be checked.If a single bearing bushing is found to be too large, it should be replaced and the U-bolt should be replaced.

2. When assembling connecting rod cover, please use torque wrench and tighten according to the specified specifications to avoid excessive torque and too little torque.

3. The new U-bolt should be checked every time for maintenance.Note whether there are cracks or dents in bolt heads, guide parts and threads.Abnormal shape and pitch of thread.Exceptions are necessary. 

4. Select U-bolts to support factory production.

U bolt preload problem

The sealing requirements of the reactor connection part are relatively high, especially the flange diameter is larger than 1m, which makes the flange thickness and bolt size larger.A large preload must be applied to the bolt to ensure initial seal and pressure of the octagonal gasket.Residual sealing conditions in operation.

Therefore, if the initial preload is uneven or insufficient, the bolt is accompanied by stress relaxation during heating, which tends to result in bolt relaxation and failure to achieve sealing.