Grade 8 nuts

[cobb]

Could someone tell me what is the rc of a grade 8 nut and bolt?


Thanks
Scott Scott Cobb
CSM Manufacturing, Inc
csm-mfg.com

 

[TVP]

SAE J429 Mechanical and Material Requirements for Externally Threaded Fasteners has a requirement for the core hardness of Grade 8 fasteners to be HRC 33-39.

SAE J995 Mechanical and Material Requirements for Steel Nuts has a requirement for the hardness of nuts to be as follows:

size 5/8 to 1 inch: 26-34 HRC
size 1 to 1.5 inch: 26-36 HRC

You can obtain these standards from SAE using the following link:

http://www.sae.org

 

[cobb]

Thanks TVP for your help. Scott Cobb
CSM Manufacturing, Inc
csm-mfg.com