Round Zinc Plated U-Bolt 3" x 9/16" Diameter x 7" Long Fine Thread Grade 5 (UB-R303-ZP)

Trailer Axle U-Bolt / Suspension Hardware Round Zinc Plated U-Bolt 3" x 9/16" Diameter x 7" Long Fine Thread Grade 5 Silver zinc plated metal round U-bolt for compatible trailer axle and suspension applications where a 3" inside width, 9/16" diameter, 7" long U-bolt is required. SKU: UB-R303-ZP 3" x 9/16" Dia. x 7" Long Fine Thread / SAE Grade 5 Key Measurements & Specs Specification Detail SKU UB-R303-ZP Product Type Round trailer axle U-bolt Size 3" x 9/16" diameter x 7" long Thread Type Fine thread Threads Per Inch 18 TPI Grade SAE Grade 5 Material / Finish Metal, zinc plated Color Silver Quantity Included 1 U-bolt Fitment / Application Category Details System Trailer axle and suspension hardware Application Reference Fits compatible 7000# applications where measurements and hardware match Matching Thread 9/16"-18 fine thread Related Hardware Reference UBN-9C / TP-4 reference where correct for the application Fitment Method Verify axle tube size, U-bolt width, bolt diameter, length, plate fitment, and nut thread before ordering Top Features Feature Buyer Benefit Zinc Plated Finish Silver finish provides corrosion-resistant surface protection for trailer hardware use 9/16"-18 Fine Thread Matches compatible fine-thread nuts and suspension hardware SAE Grade 5 Built for heavier-duty trailer suspension fastening applications where Grade 5 hardware is specified 3" x 7" Size Useful for compatible axle tube and U-bolt plate setups requiring this measurement Overview This listing is for one round zinc plated U-bolt, SKU UB-R303-ZP. The U-bolt measures 3" x 9/16" diameter x 7" long and uses 9/16"-18 fine thread. It is SAE Grade 5 hardware with a silver zinc plated finish for compatible trailer axle and suspension applications. R&P Service Insight U-bolts must be matched by measurement and thread, not by appearance alone. Before replacing axle hardware, confirm the complete suspension stack matches this 3" width, 9/16" diameter, 7" length, and 18 TPI thread requirement. Measure First: Confirm U-bolt width, diameter, and overall length before ordering. Thread Match: This U-bolt uses 9/16"-18 fine thread. Hardware Match: Confirm the nut and plate match the U-bolt size and thread before installation. R&P Knowledge Hub Compatibility: Use for compatible 7000# trailer axle applications where the existing U-bolt dimensions, thread, and related hardware match. Vehicle / System Fit: Trailer axle and suspension hardware applications using a round 3" x 9/16" diameter x 7" long U-bolt. Installation Notes: Verify axle tube size, U-bolt plate, nut thread, and length before installation. Replace worn or mismatched suspension hardware as needed. Performance Insight: Correct U-bolt size and thread engagement are critical for proper axle clamping and suspension hardware alignment. Brand & Fitment Note Selling Brand: R&P Carriages Application Reference: 7000# application references are fitment guides only. Final fit depends on matching the U-bolt measurements and related suspension hardware. What This Means: This listing is for one R&P Carriages round zinc plated U-bolt, not a complete U-bolt kit unless specifically stated. Before Ordering: Verify measurements, thread pitch, axle tube size, plate compatibility, nut compatibility, and included components before installation. R&P Repair Insight When servicing trailer suspension hardware, U-bolts should be selected by exact measurement and thread specification. A mismatch in diameter, length, thread pitch, or plate fit can prevent proper installation. Width Check: Confirm the 3" U-bolt width matches the axle tube and plate setup. Thread Check: Confirm the mating nuts are 9/16"-18 fine thread. Length Check: Confirm the 7" length provides the correct fit for the spring stack and plate arrangement. Features Round U-Bolt Design Designed for compatible round trailer axle and suspension fastening applications where this size is required. 9/16"-18 Fine Thread Fine-thread 9/16" diameter hardware with 18 threads per inch for matching compatible nuts. SAE Grade 5 Hardware Grade 5 specification for compatible trailer suspension applications requiring this hardware grade. Silver Zinc Plated Finish Zinc plated metal construction with a silver finish for clean appearance and surface protection. Included Components Quantity Item 1 Round zinc plated U-bolt, 3" x 9/16" diameter x 7" long, 9/16"-18 fine thread Not Included Nuts, plates, washers, and additional suspension hardware unless separately selected or stated Important Fitment Note: Verify all measurements, thread pitch, axle tube size, U-bolt plate fitment, nut compatibility, and included components before installation. This listing is for one U-bolt only unless otherwise stated. Shop Related U-Bolt Hardware UB-R303-ZP round zinc plated U bolt, 3 inch 9/16 diameter 7 inch long U bolt, 9/16-18 fine thread U bolt, SAE Grade 5 trailer axle U bolt, silver zinc plated metal U bolt, 7000 lb trailer axle U bolt, UBN-9C compatible thread reference, TP-4 trailer suspension hardware reference, R&P Carriages trailer axle suspension hardware