~According to GB / t9161 standard, the type of the joint bearing can be divided into: bent rod end joint bearing (type code: SQ); straight rod end joint bearing (type code: SQZ); single rod end joint bearing (type code: SQD); left internal thread assembly rod end joint bearing (type Code: sllb); left external thread assembly rod end joint bearing (type generation Salb; sllb; sqld; SK; SF; SF; sllb; sllb; sqld; sq No.: SLR).