DISC-LOCK Tension Control Bolts are produced with full factory mill certifications and lot identification marked on the head of each bolt.
Tension control bolts meet all AISC requirements and specifications of A.S.T.M. A325M. A490M structural bolts and DISC-LOCK Nuts meet all physical requirements of A.S.T.M. A194-2H.
The DISC-LOCK Fastening System is approved by the U.S. Department of Transportation Federal Rail Administration.
Each container of DISC-LOCK Rapid Tension bolts and nuts are labeled with lot number identification which corresponds to the lot number marked on each bolt in that container.
The lot number allows for traceability of the bolt from raw material through manufacturing.
The accompanying certification documents are traced to the actual bolts by the lot number identification system.