ISUZU CXZ51K 6WF1 Front Spring U-Bolt Set with High-Strength Alloy Steel and Anti-Corrosion Coating, 250 mm Length
| Material: | High-strength Alloy Steel | Overall Length: | 250 Mm |
| Weight: | 1.95 Kg | Thread Type: | Rolled Thread |
| Surface Treatment: | Anti-corrosion Coating | Kit Contents: | U-bolts + Nuts + Washers |
| Engine Compatibility: | 6WF1 | Vehicle Models: | ISUZU CXZ51K / CYZ51K / EXZ51K |
| High Light: | High-strength alloy steel U-Bolt Set,Anti-corrosion coating Front Spring U-Bolt Set,250 mm Overall Length Leaf Spring U-Bolt |
||
Front Spring U-Bolt Set 1-87870343-1 1878703431 for ISUZU CXZ51K 6WF1 — Verified OEM fit for heavy-duty leaf spring suspension clamping system. This U-bolt set is a critical clamping component of the front leaf spring suspension system, responsible for securing the leaf spring pack to the front axle housing and maintaining proper suspension geometry under heavy loads.
The front spring U-bolt set serves as the primary clamping mechanism that binds the leaf spring assembly to the front axle. It provides the force required to clamp the leaf spring and axle together, preventing lateral and longitudinal movement during vehicle operation. The U-bolt also maintains the correct spring curvature and alignment, which directly affects steering stability, tire wear patterns, and load distribution across the front axle.
ISUZU genuine U-bolt sets are manufactured from high-strength alloy steel with rolled threads for superior fatigue resistance, ensuring consistent clamping force throughout the service life of the suspension system.
Replace the U-bolt set when any of these symptoms appear:
- Visible corrosion or pitting on U-bolt surface — rust penetration reduces the effective cross-sectional area and load-carrying capacity
- Loose or elongated U-bolt threads — thread deformation from over-torque or fatigue prevents proper nut tightening and torque retention
- Leaf spring misalignment or shifting — the spring pack moves out of position relative to the axle, causing steering pull or abnormal tire wear
- Clunking or knocking noise from front suspension — loose U-bolts allow the spring pack to shift during braking or cornering
- Deformed or stretched U-bolt legs — indicates the U-bolt has been stressed beyond its elastic limit, requiring immediate replacement
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 1-87870343-1 | ISUZU OEM Parts Database |
| Part Number (Long) | 1878703431 | ISUZU OEM Parts Database |
| Part Name | U-BOLT SET; FRT SPRING | ISUZU EPC |
| Vehicle Model | ISUZU CXZ51K | ISUZU application catalog |
| Engine Compatibility | 6WF1 | ISUZU application catalog |
| Overall Length | 250 mm (L=250) | Product specification |
| Weight (per unit) | 1.95 kg | ISUZU parts specification |
| Material | High-strength alloy steel | Material certificate |
| Thread Type | Rolled thread | Manufacturing specification |
| Surface Treatment | Anti-corrosion coating | Salt spray test |
| Installation Success Rate | ≥ 99% | Based on repair order tracking |
| Certification | ISO/TS 16949 | Third-party system audit |
| Part Number: | 1-87870343-1 | Product Name: | Front Spring U-Bolt Set |
| Car Model: | CXZ51K | Engine Model: | 6WF1 |
| Condition: | 100% Brand New | Size: | Standard |
| Origin: | China Mainland | Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
Superior tensile strength and fatigue resistance under heavy load — verified by material certificate and hardness testing.
Improved thread strength and fatigue life compared to cut threads — verified by manufacturing specification and tensile testing.
Extended service life in harsh road environments — verified by salt spray testing.
Precision-matched to ISUZU CXZ51K front spring pack geometry — direct drop-in fit without modification.
U-bolts, nuts, and washers supplied together for correct torque distribution — verified by assembly dimension chain.
Full traceability with material certificates and batch inspection reports — third-party certified.
Reference ISUZU Workshop Manual:
- Preparation: Raise the vehicle on a hoist. Support the front axle independently to relieve tension on the leaf springs.
- Removal: Remove the U-bolt nuts, washers, and anchor plate. Remove the old U-bolts.
- Inspection: Inspect the leaf spring pack and axle housing seat for wear, cracks, or deformation. Replace any damaged components.
- Installation: Install new U-bolts over the leaf spring and axle housing. Install the anchor plate, washers, and nuts.
- Torque Sequence: Tighten U-bolt nuts in a diagonal sequence. First stage: tighten to 25 N·m (18 lb ft). Second stage: tighten to 110 N·m (81 lb ft) or as specified in the ISUZU workshop manual for the CXZ51K model.
- Final Check: Verify the spring is properly seated and centered on the axle. Check that the U-bolt legs extend evenly beyond the nuts.
- Re-torque: Re-torque U-bolt nuts after the first 100 km of driving, then at every scheduled maintenance interval.
| Fastener | Torque |
|---|---|
| U-Bolt Nuts (Stage 1) | 25 N·m (18 lb ft) |
| U-Bolt Nuts (Stage 2) | 110 N·m (81 lb ft) |
| Spring to Bracket Nuts | 95 N·m (70 lb ft) |
| Spring to Shackle Nut | 95 N·m (70 lb ft) |
- Every 10,000 km: Inspect U-bolt condition for corrosion, thread damage, or loosening. Check torque.
- Every 40,000–50,000 km: Inspect leaf spring pack for cracks or sagging. Check U-bolt condition.
- After any suspension repair: Always replace U-bolts with new units.
- When U-bolts are removed: Always replace with new U-bolts regardless of visual condition.
Engine Block 5873102680 5-87310268-0 For ISUZU 100P 4JB1 Diesel Engine Parts
Engine Block 5873102680 5-87310268-0 For ISUZU 100P 4JB1 Diesel Engine Parts Part Number: 5873102680 5-87310268-0 Product Name: Engine Block Car Model: ISUZU 100P Engine Model: ISUZU 4JB1 Condition: 100% Brand New Size: Standard Weight: Standard Origin: China Mainland Main Market: Middle East ,Asia...
Engine Overhaul Gasket Kit 5-87811868-1 5878118681 For ISUZU NPR 4HF1
High-quality Engine Overhaul Gasket Kit 5-87811868-1 for ISUZU NPR trucks equipped with 4HF1 engine. Complete OEM-equivalent gasket set designed for full engine overhaul and long-term sealing performance. Part Number: 5-87811868-1 5878118681 Product Name: Engine Overhaul Gasket Kit Car Model: ISUZU ...
Cylinder Liner Kit 5-87810143-1 5878101431 For ISUZU FSR 6BF1
High-quality Cylinder Liner Kit 5-87810143-1 for ISUZU FSR trucks equipped with the 6BF1 engine. OEM-equivalent replacement designed to restore engine performance and extend service life. Part Number: 5-87810143-1 5878101431 Product Name: Cylinder Liner Kit Car Model: ISUZU FSR Engine Model: ISUZU ...
Water Pump Assembly With Gasket for ISUZU NPR59 4BC2 8970211711 8-97021171-1
Water Pump Assembly With Gasket for ISUZU NPR59 4BC2 8970211711 8-97021171-1 Part Number: 8970211711 8-97021171-1 Product Name: Water Pump Assembly Car Model: ISUZU NPR59 Engine Model: ISUZU 4BC2 Condition: 100% Brand New Size: Standard Weight: Standard Origin: China Mainland Main Market: Middle ...
