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ISUZU CXZ81 10PE1 Rear Spring U-Bolt Set 1-87870392-1 OEM Fit
Product Overview
Rear Spring U-Bolt Set 1-87870392-1 1878703921 for ISUZU CXZ81 10PE1 CYZ51K — Verified OEM Fit for Heavy-Duty Rear Leaf Spring Clamping System
This U-bolt set is a critical clamping component of the rear leaf spring suspension system, responsible for securing the rear leaf spring pack to the drive axle housing and maintaining proper suspension geometry under heavy loads.
Working Principle
The rear spring U-bolt set serves as the primary clamping mechanism that binds the rear leaf spring assembly to the drive axle. It provides the force required to clamp the leaf spring and axle together, preventing lateral and longitudinal movement during vehicle operation.
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.
Failure Symptoms
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 rear axle misalignment or abnormal tire wear
Clunking or knocking noise from rear suspension — loose U-bolts allow the spring pack to shift during acceleration, braking, or cornering
Deformed or stretched U-bolt legs — indicates the U-bolt has been stressed beyond its elastic limit, requiring immediate replacement
Critical Inspection Note: ISUZU service manuals require that U-bolts must be replaced, never reused, whenever the leaf spring assembly is removed or the suspension is disassembled. Reusing old U-bolts can result in insufficient clamping force and potential suspension failure.
Product Specifications
Verification Item
Data / Standard
Source / Method
Part Number (Short)
1-87870392-1
ISUZU OEM Parts Database
Part Number (Long)
1878703921
ISUZU OEM Parts Database
Part Name
U-BOLT SET; RR SPRING
ISUZU EPC
Thread Size
M27
Product specification
Width (Inner Span)
93 mm
Product specification
Length
350 mm
Product specification
Weight (per unit)
3.67 kg
Product 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
Product Image
Part Number:
1-87870392-1
Product Name:
Rear Spring U-Bolt Set
Car Model:
CXZ81
Engine Model:
10PE1
Condition:
100% Brand New
Origin:
China Mainland
Vehicle Compatibility
Brand
Model
Chassis
Engine
Years
ISUZU
GIGA
CXZ81
10PE1
1994–2000
ISUZU
GIGA
CXZ81K
10PE1
1994–2000
ISUZU
GIGA
CXZ51K
6WF1
2000–2008
ISUZU
GIGA
CYZ51K
6WF1
2000–2008
ISUZU
GIGA
CYZ51L
6WF1
2000–2008
ISUZU
GIGA
EXZ51K
6WF1
2003–2008
Important Fitment Notes: This U-bolt set is designed for rear axle application. Front spring U-bolt sets use different specifications. Confirm spring pack thickness before ordering. For right-hand drive vehicles, verify clearance and routing.
Features & Benefits
High-Strength Alloy Steel Construction
Superior tensile strength and fatigue resistance under heavy load
Rolled Thread Design (M27)
Improved thread strength and fatigue life compared to cut threads
Anti-Corrosion Surface Treatment
Extended service life in harsh road environments
27*93*350 mm Dimensions
Precision-matched to ISUZU CXZ81/CYZ51K rear spring pack geometry
Complete Kit with Nuts & Washers
U-bolts, nuts, and washers supplied together for correct torque distribution
ISO/TS 16949 Quality System
Full traceability with material certificates and batch inspection reports
Installation Guidelines
IMPORTANT: Suspension system service must be performed by a qualified technician. Always support the vehicle on a hoist and relieve spring tension before loosening U-bolts. Never reuse old U-bolts.
Preparation: Raise the vehicle on a hoist. Support the rear 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: 25 N·m (18 lb ft). Second stage: 110 N·m (81 lb ft).
Final Check: Verify the spring is properly seated and centered on the axle.
Re-torque: Re-torque U-bolt nuts after the first 100 km of driving.
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...