Single Piece, Spring Inserted, Reusable Seized Nut For Size M22 Lock Nut M 022 For Hook Bolts Specification Modle No Sp 22 Pitch 2.5, Hn 18.0, Bn 32.0, Cn 37.0, Ln 30.0,Sn 32.0 Materials Sts, S45C, Sc M, Plating Electro Zinc Plating, Melted Zinc, Nickle, Chrome, Zinc Powder Plating. Make - Saper Lock Or Gat Ch Or Screuh Or Similar. Confirming Generic Technical Specification For Self Locking Nuts To Be Used In Hook Bolts Of Steel Girder Bridge Over Indian Railways No. Rdso-Bnsoebs(Sb-1)/7/2021-O/O Ed/Bns/Rdso Date-1 6.03.2023.( Accepted Make/Brand : Saper Lock Or Similar). [ Warranty Period: 30 Months After The Date Of Delivery ] ]