Summary

Eyenut refers to the nut and bolt or screw screwed together for fastening parts, an original all manufacturing machinery must be used. The nut is fixed with the common engineering ring pendant. Below the nut with a screw thread, according to the different specifications, drilling, using screw fixation.

brief introduction

Eyenut is mechanical equipment connect parts through the inner side of the screw nut and screw rings, the same size, can be connected together. Eyebolt, usually matched with the external thread column, lifting equipment, such as mold, chassis, motor etc..

Range of use

This standard is applicable to lifting machinery, equipment and other general cargo. 

Note: Commodity fastener varieties, should be preferred.

Reference standard

Acceptance inspection, marking and packing of GB 90 fasteners 

GB 196 ordinary thread basic size (diameter 1 ~ 600mm) 

GB 197 common thread tolerance and fit (diameter 1 ~ 355mm) 

Test method for hardness of GB 230 metal 

GB 699 high quality carbon structural steel technical conditions 

Marking method for GB 1237 fastener 

GB 5267 thread fastener coating 

Determination of average grain size of GB6394 metal 

Sign

Mark method according to GB1237 regulations 

The specifications for the 20mm, the material is 20 steel, normalizing treatment, without marking on A surface treatment of screw ring; 

Screw GB825-M20 

Technical requirement

Application of 20 or 25 rings screw steel (GB699) manufacturing 

Screw ring must be approved by the whole forging, forging should be normalized, and removal of skin, refined grain size should not be less than 5 (YB27-77) 

Forgings are not allowed to burn, crack defects. 

Surface treatment

The screw ring is generally not treated, but according to the requirements of galvanized passivation, chrome surface treatment, and according to the provisions of GB5267-85. 

Standard Test Method for chemical composition and mechanical properties of oxygen - driven treatment materials should be carried out in accordance with GB699. 

When conventional inspection, the test method of grain size is not advanced, the test method of grain size is according to the provisions of YB27. 

Check thread thread gauge and smooth limit gauge or the universal gauge.