The IEEE Standard Dictionary of Electrical and Electronics Terms (6th ed) [Jane Radatz, Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers Standards
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LIGHT-DUTY AXLE U-BOLT PLATE. For use on 1-1/4" x 1-1/2" (1.18cm x 3.81cm) square beam axles and light-duty tube axles. For 1-3/4" (4.45cm) wide springs.