170-28-27 – Weld Yokes – SPL170 Series – Butt Dia 4.350″ – Tube Dia Wall 4.724X0.197

• SPL170 series sits above 1710 in the strength hierarchy -- appropriate for heavy-duty commercial and vocational applications
• 4.724" x 0.197" tube is a heavy-wall large-diameter specification used on Class 6-8 commercial shafts
• 4.350" butt diameter requires matching tube ID; verify tube bore is clean and round before fitting the weld yoke
• 4.724" centerline-to-weld is an unusually long distance -- provides a long weld heat-affected zone that must be allowed to cool slowly to prevent distortion
• Use Spicer SPL170 U-joint; do not substitute a lighter series joint at this torque level

The long centerline-to-weld dimension on this yoke is an engineering trade-off: it increases the distance between the weld and the U-joint working faces, which reduces the risk of weld distortion influencing joint phasing accuracy. However, the longer moment arm between weld and U-joint centerline also increases the bending stress on the yoke body during peak torque events -- this is acceptable within the SPL170 rating but should be considered if the vehicle operates at or near the rated torque limit continuously.