Maintenance Intervals And Specifications
U-BOLT NUT TORQUE CHART
Torque
Feature Code Rear Suspension Capacity and Type
lbf - ft N • m
14SAB 23,000-lb Capacity, RR, Spring, Single, with 3 Torque Rods 400-425 542-576
14SAH 18,500-lb Capacity, RR, Spring, Single Vari-Rate 370-400 502-542
14SAL 31,000-lb Capacity, RR, Spring, Single Vari-Rate, with 4,500-lb Auxiliary Multileaf
Springs
370-400 502-542
14SAM 20,000-lb Capacity, RR, Springs, Vari-Rate 370-400 502-542
14SAN 23,500-lb Capacity, RR, Spring, Single, Vari-Rate 370-400 502-542
14SBM 31,000-lb Capacity, RR, Spring, Single with 3 Torque Rods 400-425 542-576
14SZB 4,500-lb Capacity, Rear Auxiliary Multileaf Springs 370-400 502-542
14TBJ 20,000-lb Capacity, International Air Suspension (IROS) 370-400 502-542
14TBZ 23,000-lb Capacity, Single, Air (Hendrickson PRIMAAX EX) 350-400 475-542
14UNW, 14UNX, and 14UNY 46,000-lb Capacity, Tandem, Air (Hendrickson PRIMAAX EX), with 72 inch, 55
inch, and 60 inch axle spacing.
350-400 475-542
14UNA 40,000-lb Capacity, International 4-Spring, Multileaf 260-300 353-407
14UNL, 14UNM, 14UNN,
14UNS, 14UNT, and 14UNU
40,000-lb Capacity, International Air Suspension (IROS) 370-400 502-542
14VAD 18,500-lb Capacity, RR, Springs, Vari-Rate, with 4,500-lb Auxiliary Rubber Spring 370-400 502-542
14VAG 20,000-lb Capacity, RR, Springs, Vari-Rate, with 4,500-lb Auxiliary Rubber Spring 370-400 502-542
14VAH 23,500-lb Capacity, RR, Springs, Vari-Rate, with 4,500-lb Auxiliary Rubber Spring 370-400 502-542
14VAJ 31,000-lb Capacity, RR, Springs, Vari-Rate, with 4,500-lb Auxiliary Rubber Spring 370-400 502-542
NOTE: For all other vendor supplied suspensions, refer to vendor’s website for proper torque specifications.
3879634R1 221
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