Manhole specifications and model markings
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HG/T21520-2014 Manhole RFⅢs-35CM (NM-PTFE) 500-10, what does s mean?
The 2005 version also has double-headed studs, and the 2014 version has hexagonal head bolts and fully threaded studs.
This post was last edited by Lin Liangliang on 2019-4-25 17:29, indicating that the fasteners are double-headed studs of equal length.
This is the representation method of the 2005 version of the manhole standard: Stud "S”