ISUZU 700P Front Steel U-Bolt High-Strength Steel with Rolled Threads M18 × 1.5 Thread Size OEM Fit
| Thread Size: | M18 × 1.5 (Metric Fine Thread) | U-Bolt Nut Torque: | 106 N·m ± 7.8 N·m (78 Lb·ft ± 5.8 Lb·ft) |
| Material: | High-Strength Steel | Thread Formation: | Rolled Threads |
| Net Weight: | 0.677 Kg | OEM Part Number: | 2902131-P301 / 2902131P301 |
| Model Reference: | QMLS-R | Position: | Front Axle — Leaf Spring Clamping |
| High Light: | High-Strength Steel Front Steel U-Bolt,Rolled Threads Leaf Spring U-Bolt,M18 × 1.5 Thread Size U-Shaped Screw |
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Front Steel U-Shaped Screw 2902131-P301 2902131P301 QMLS-R for ISUZU 700P NPR NQR — Verified OEM Fit Leaf Spring U-Bolt with Nuts
This U-bolt is a critical suspension clamping component that secures the front leaf spring pack to the front axle housing, maintaining proper suspension geometry and ensuring safe vehicle operation under heavy loads.
The front leaf spring U-bolt wraps around the axle housing and passes through the leaf spring clamping plate. When the U-bolt nuts are tightened, the U-bolt clamps the leaf spring pack firmly against the axle housing, preventing lateral and longitudinal movement of the spring relative to the axle.
Manufactured from high-strength steel with rolled threads (OEM specification) for superior fatigue resistance. Rolled threads are stronger than cut threads because the rolling process compresses the grain structure rather than cutting through it.
- 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 the 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) | 2902131-P301 | ISUZU OEM Parts Database |
| Part Number (Long) | 2902131P301 | ISUZU OEM Parts Database |
| Model Reference | QMLS-R | IZUMI aftermarket reference |
| Thread Size | M18 * 1.5 (Metric Fine Thread) | ISUZU 700P series specification |
| Thread Formation | Rolled Threads (OEM Specification) | ISUZU 700P series specification |
| Material | High-Strength Steel | Product specification |
| Net Weight (per unit) | 0.677 kg | Autopart-Masters specification |
| U-Bolt Nut Torque (Front) | 106 N·m ± 7.8 N·m (78 lb·ft ± 5.8 lb·ft) | ISUZU 700P Workshop Manual |
| Certification | ISO/TS 16949 | Third-party system audit |
| Part Number: | 2902131-P301 | Product Name: | Front Steel U-Bolt |
| Car Model: | 700P | Engine Model: | 700P |
| Condition: | 100% Brand New | Size: | Standard |
| Material: | High-strength aluminum alloy & precision bearings | Quality Standard: | OEM equivalent / ISO quality control |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | 700P | — | 4HK1 / 4HE1 | 2000s–Present |
| ISUZU | NPR | NPR70 / NPR71 / NPR75 | 4HK1 / 4HF1 / 4HE1 | 1998–2016 |
| ISUZU | NQR | NQR70 / NQR71 / NQR75 | 4HK1 / 4HF1 | 1998–2016 |
| ISUZU | NKR | NKR66 / NKR71 / NKR77 | 4HF1 / 4HG1 / 4HK1 | 1994–2007 |
| ISUZU | NNR | NNR85 | 4JJ1 | 2007–2016 |
| ISUZU | ELF | N-Series | 4HK1 / 4HF1 | 1998–2016 |
- This U-bolt is designed for the front axle application. The rear axle U-bolt uses a different part number (2912035-P301 or 1513711952)
- Confirm the thread size (M18 * 1.5) and length against your original component before ordering
- U-bolts should be replaced, never reused, whenever the leaf spring assembly is removed or the suspension is disassembled
- U-bolt nuts must be tightened to 106 N·m ± 7.8 N·m in a diagonal sequence
| Feature | Benefit + Verification Signal |
|---|---|
| High-Strength Steel Construction | Superior tensile strength and fatigue resistance under heavy load — verified by material certificate and hardness testing |
| Rolled Thread Design (M18 * 1.5) | Improved thread strength and fatigue life compared to cut threads — verified by ISUZU 700P series specification |
| OEM-Exact Fitment | Direct replacement for 2902131-P301 / 2902131P301 without modification — confirmed by dimensional inspection against OEM specifications |
| 0.677 kg Net Weight | Precision-matched to the ISUZU 700P front suspension geometry — verified by Autopart-Masters specification |
| Complete Kit with Nuts | U-bolts and nuts supplied together for correct torque distribution — verified by kit contents inspection |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified |
- 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 and washers. Remove the U-bolt clamp and take out the old U-bolt
- Inspection: Inspect the leaf spring pack and axle housing seat for wear, cracks, or deformation. Replace any damaged components. Clean the U-bolt mounting area
- Installation: Install the new U-bolt over the leaf spring and axle housing. Install the clamp plate, washers, and nuts
- Torque Sequence: Tighten U-bolt nuts in a diagonal sequence to 106 N·m ± 7.8 N·m (78 lb·ft ± 5.8 lb·ft)
- 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 |
|---|---|
| Front U-Bolt Nuts | 106 N·m ± 7.8 N·m (78 lb·ft ± 5.8 lb·ft) |
| Spring Pin Nut | 93–127 N·m (69–94 lb·ft) |
| Spring Shackle Nut | 93–127 N·m (69–94 lb·ft) |
| Front Axle Bumper Nut | 21–30 N·m (15–22 lb·ft) |
- Standard Packaging: Anti-rust oil + VCI film + neutral carton
- Custom Packaging: Neutral box, color box, or customer-branded packaging
- Suitable For: Suspension repair shops, ISUZU parts distributors, fleet maintenance centers
- Supply Capacity: Stable batch supply with batch-level quality reports available
- Minimum Order Quantity: Small quantities accepted (quantity discounts available)
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