Rear Leaf Spring U-Bolt With Nuts 1-51371195-0 1513711950 For ISUZU 700P ELF NNR NPR NQR 4HK1 4JH1 — OEM Verified 18mm × 1.5mm × 385mm Heavy-Duty Suspension Clamp

The Rear Leaf Spring U-Bolt with OEM numbers 1-51371195-0 / 1513711950 is a verified direct-fit suspension fastener for ISUZU 700P, ELF (N-Series), NNR, NPR, and NQR medium-duty trucks equipped with 4HK1 and 4JH1 diesel engines. This U-bolt is the rear leaf spring-to-axle clamping component that wraps around the axle tube and passes through the spring plate, securing the leaf spring pack firmly against the axle housing under the vehicle's gross weight.

The U-bolt is supplied with nuts and is available in two quality tiers — ISUZU (Qingling) quality and aftermarket quality — giving distributors and fleet operators a choice between factory-level supply and a cost-effective replacement option. The HOSEM brand version is also listed under the same reference family, with a confirmed 2.3 kg unit weight and steel construction.

• Dimensional Specification Verified: 18 mm (diameter) × 1.5 mm (thread pitch) × 385 mm (length) — confirmed across multiple independent supplier catalogs for the 1513711952 / 1-51371195-0 reference family.
• Weight Verified: 2.3 kg net weight — confirmed by HOSEM-branded supplier listing under the same part family.
• Material Verified: Steel — confirmed by supplier material specification for the 1-51371195 platform.
• Nuts Included Verified: Multiple supplier listings describe the part as "U-Bolt with Nuts" / "U-Bolt with nut" for the 1-51371195-0 reference.
• Multi-Platform Coverage Verified: Confirmed for ISUZU 700P, ELF (N-Series), NNR, NPR, and NQR medium-duty trucks.
• Cross-Reference Verified: Interchange references include 1513711952, 1513711950, 1513711953, 1-51371195-2, 1-51371195-0, 1-51371195-3, 2912035-P301, and secondary references 8972194560 / 8-97219456-0.

• Clunking or popping from the rear suspension: A stretched or loosened U-bolt allows the axle to shift relative to the leaf spring, producing metallic impact noise over bumps or during acceleration/braking.
• Axle misalignment / dog-tracking: The rear axle sits off-center relative to the chassis, causing the vehicle to "crab" or track incorrectly — a sign the U-bolt no longer maintains clamping force.
• Uneven or accelerated rear tire wear: Axle misalignment from a loose U-bolt changes rear toe and thrust angle, causing shoulder wear or cupping on rear tires.
• Visible thread deformation or necking: Stretched threads or a reduced cross-section at the U-bolt legs indicate the fastener has yielded under load and can no longer clamp safely.
• Rusted or corroded U-bolt legs: Heavy corrosion reduces effective clamping load and is a structural safety concern on loaded commercial vehicles.
• Spring plate movement or gap: A visible gap between the spring pack and axle seat, or movement of the spring plate, indicates lost clamping force.

• Rear position only: This is a rear leaf spring U-bolt. Front U-bolts (e.g., 8-94157676-0) use different dimensions and clamping geometry. Do not substitute front for rear or vice versa.
• Dimensions are non-negotiable: The 18 mm × 1.5 mm × 385 mm specification is the defining fitment parameter. Confirm the original U-bolt's diameter, thread pitch, and overall length before ordering. A U-bolt that is too short will not engage sufficient thread; one that is too long can interfere with surrounding components.
• Quality tier selection: The part is available in ISUZU (Qingling) quality and aftermarket quality. For fleet or warranty-sensitive applications, specify the ISUZU (Qingling) tier. For cost-sensitive distribution, the aftermarket tier is available at a lower price point.
• Nuts included: Supplier listings confirm the U-bolt is supplied with nuts. Always confirm nut inclusion at the time of inquiry — some listings may sell the U-bolt alone.
• Cross-reference 2912035-P301: This IZUMI reference is widely cross-listed with the 1-51371195 family and can be used as an alternative sourcing lead, but dimensional verification against the 18 × 1.5 × 385 mm specification remains mandatory.

1. Safety first: Park on level ground, engage parking brake, and chock front wheels. Raise and support the rear axle securely on jack stands.
2. Support the leaf spring: Use a jack under the leaf spring pack to relieve tension before removing the U-bolt nuts.
3. Remove the old U-bolt: Hold the U-bolt legs to prevent rotation and remove the nuts. Note the orientation of the U-bolt, spring plate, and any spacers.
4. Inspect the leaf spring and axle seat: Check for cracks, wear, or corrosion at the spring-to-axle interface. Replace damaged spring components before installing new hardware.
5. Install the new U-bolt: Seat the U-bolt over the leaf spring and through the axle bracket. Install new washers and the supplied nuts — do not reuse old nuts, as they may have lost prevailing torque.
6. Torque in stages: Tighten the nuts evenly in a cross pattern to the workshop manual specification. Uneven tightening can cock the U-bolt and cause axle misalignment.
7. Re-check torque after settling: Drive the vehicle a short distance, then re-check U-bolt nut torque. Suspension hardware can settle after initial load cycles.
8. Verify axle alignment: After installation, confirm the rear axle is centered and that the vehicle tracks straight before returning to service.

• Inspect rear U-bolts at every suspension service or every 20,000–30,000 km — check for rust, thread damage, and clamping force.
• Re-torque U-bolt nuts after the first 500–1,000 km following installation, and periodically thereafter.
• Replace U-bolts whenever the leaf springs are replaced — U-bolts are considered limited-life fasteners and should not be reused after spring service.

• Standard packing: Neutral carton with protective wrapping; wooden pallet available for bulk export orders.
• Package contents: 1 × Rear Leaf Spring U-Bolt + Nuts (washers and spring plate not included unless explicitly stated — confirm at inquiry).
• Set options: Single U-bolt or rear axle set (typically 4 pieces per vehicle) — specify at inquiry.
• Suitable for: ISUZU 700P / NPR / NQR suspension repair shops, fleet maintenance departments, spare parts distributors, and export wholesalers.
• Related parts available: Front leaf spring U-bolt (8-94157676-0), U-bolt nuts and washers, leaf spring center bolts, spring plates, and complete rear suspension hardware kits.