Home > Products > Couplings & Accessories > Restricted Access Swivel Couplings RESTRICTED ACCESS SWIVEL COUPLINGS 5" couplings for Hevi-Duty™ ends, 148mm for metric ends. Factory Part Numbers Recomended Components Warranty Factory Part Numbers Part Number Size End Type Coupling Type Working Pressure bar / psi C50SSD 5" .600" Hevi-Duty™ Socket Head 2-Bolt 130 / 1885 C148BBM-GF 148mm Metric Socket Head 2-Bolt 85 / 1233 200-10501 5" .600" Hevi-Duty™ Hex Head 4-Bolt 130 / 1885 550-10667 148mm Metric Hex Head 4-Bolt 85 / 1233 Recomended Components Warranty 3-year limited warranty on mechanical and structural components 2-year limited warranty on gasoline and diesel engines 2-year limited warranty on electrical and hydraulic systems 10-year limited warranty on exclusively designed ‘double ball’ slewing ring