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1513711952 Rear Spring U-Bolts For ISUZU 700P ELF NNR NPR NQR
Direct replacement rear spring U-bolt for ISUZU 700P, ELF, NNR, NPR, and NQR medium-duty trucks OE cross reference: 1513711952, 1513711950, 1513711953, 1-51371195-2, 1-51371195-0, 1-51371195-3, 2912035-P301 Size: 18mm (diameter) × 1.5mm (thread pitch) × 385mm (length) Secures rear leaf spring to axle – Critical suspension fastener Choose from 2 quality levels – China ISUZU (Qingling) Quality / Aftermarket Quality MOQ: 1 piece (set recommendations available)
Description
Products Overview
TThe Rear Spring U-Bolt is a critical suspension fastener that secures the rear leaf spring assembly to the axle housing on ISUZU medium-duty trucks. These U-shaped bolts wrap around the axle tube and pass through the spring plate, where nuts are tightened to clamp the leaf spring firmly against the axle .
This U-bolt is specifically designed for ISUZU 700P, ELF (N-Series), NNR, NPR, and NQR trucks,OE cross reference: 1513711952, 1513711950, 1513711953, 1-51371195-2, 1-51371195-0, 1-51371195-3, 2912035-P301 – widely used for cargo transport, delivery services, commercial fleets, and municipal applications worldwide. China ISUZU (Qingling) quality or Aftermarket Quality for choose , size 18*1.5*385.These trucks are frequently operated at or near maximum gross vehicle weight (GVWR), placing significant stress on suspension components .
U-bolts are considered critical fasteners that undergo tremendous stress during normal operation. Over time, original U-bolts can stretch, corrode, or lose clamping force due to metal fatigue, rust, or previous removal during suspension service . Additionally, U-bolts have a finite service life and should be replaced whenever leaf springs are removed or replaced .
Products Specifications
| Parameter | Specification |
|---|---|
| Product Name | Rear Spring U-Bolt / Axle U-Bolt / Spring Clamping Bolt |
| OE Numbers | 1513711952, 1513711950, 1513711953, 1-51371195-2, 1-51371195-0, 1-51371195-3, 2912035-P301 |
| Size | 18mm (diameter) × 1.5mm (thread pitch) × 385mm (length) |
| Quality Options | China ISUZU (Qingling) Quality / Aftermarket Quality |
| Material | High-strength carbon steel or alloy steel (grade 10.9 or equivalent) |
| Thread Type | Metric fine thread – M18 × 1.5 |
| Thread Formation | Rolled threads (OEM specification) |
| Finish | Zinc plated / Yellow zinc dichromate / Black oxide (dependent on quality tier) |
| Heat Treatment | Quenched and tempered – meets OEM hardness specifications |
| Tensile Strength | Grade 10.9 minimum (1000 MPa / 145,000 psi) |
| Function | Secures rear leaf spring to axle housing |
| Fitting Position | Rear axle – left and right sides |
| Compatible Models | ISUZU 700P, ELF, NNR, NPR, NQR (see fitment table) |
| Quantity per Axle | 4 U-bolts per vehicle (2 per side) |
| H/S Code | 7318159000 |
| Place of Origin | China |
| MOQ | 1 piece |
| Warranty | 1 Year |
Related Products
More Related Parts You May Need
| Part | OEM Number (Typical) | Purpose |
|---|---|---|
| U-Bolt Nut (M18×1.5) | 1513711955 (example) | Secures U-bolt – use new nuts |
| Spring Plate | 1513711956 (example) | Retains U-bolts and spring pack |
| Rear Leaf Spring | 8983350390 (example) | Primary rear suspension |
| Spring Center Bolt | 8970283920 (example) | Aligns spring pack |
| Axle Bracket | 8970283930 (example) | Spring seat on axle |
Signs Your ISUZU Rear Leaf Spring U Bolt Needs Replacement
| Symptom | What You May Notice | What It Means |
|---|---|---|
| Visible rust or corrosion | Heavy rust on U-bolt threads or bends | Reduced strength – potential for sudden failure |
| Loose axle | Axle shifts or moves relative to leaf springs | U-bolts have lost clamping force |
| Clunking noise from rear | Metallic clunk on acceleration, braking, or bumps | Loose U-bolts or broken fasteners |
| U-bolt threads stripped | Nuts spin without tightening or cross-threaded | Previous over-tightening or corrosion damage |
| U-bolt appears bent or distorted | Deformed shape – not symmetrical | Overload damage or previous improper installation |
| Previous removal without replacement | U-bolts reused after spring service | Unknown stretch history – replace immediately |
| Vehicle pulls or wanders | Poor tracking – rear axle not aligned | Loose U-bolts causing axle misalignment |
U Bolt Installation Notes
| Step | Procedure |
|---|---|
| 1 | Raise the rear of the vehicle and secure on jack stands |
| 2 | Support the rear axle with a floor jack |
| 3 | Remove the rear wheels (if needed for access) |
| 4 | Remove the old U-bolt nuts (penetrating oil may be required) |
| 5 | Remove the old U-bolts – discard immediately (do not reuse) |
| 6 | Inspect spring plate and axle seat for damage or rust |
| 7 | Clean the axle tube and spring plate mounting surfaces |
| 8 | Position new U-bolts around the axle tube and through the spring plate |
| 9 | Install new nuts and washers (new nuts are recommended) |
| 10 | Torque in stages using a cross pattern |
| 11 | Lower the vehicle to normal ride height before final torquing |
| 12 | Bounce the suspension to settle the springs |
| 13 | Perform final torque to factory specification |
| 14 | Re-torque after 50-100 miles / 80-160 km of driving |
Critical Installation Warnings
| Warning | Consequence |
|---|---|
| Do not reuse old nuts | Old nuts may have damaged threads – use new nuts |
| Do not lubricate threads | Lubrication increases clamp load – may over-stretch U-bolt |
| Do not use impact gun for final torque | Over-torque risk – use torque wrench only |
| Must re-torque after break-in | U-bolts settle – failure to re-torque leads to loose axle |
| Replace immediately if damaged | Damaged U-bolts can fail suddenly |
How Many U Bolts Do I Need?
| Application | Quantity Needed |
|---|---|
| One wheel position (single side) | 2 U-bolts |
| Complete rear axle (both sides) | 4 U-bolts (2 per side) |
| Full set with nuts and washers | 4 U-bolts + 8 nuts + 8 washers |
Why Choose Us?
| Reason | Benefit |
|---|---|
| 2 quality options on one page | Compare and choose based on your budget and durability needs |
| China ISUZU (Qingling) Quality available | OEM-grade for professional repairs – best value |
| Aftermarket Quality available | Economical option for standard replacement |
| Precise size: 18×1.5×385mm | Factory-correct dimensions for ISUZU medium-duty trucks |
| Rolled threads | Stronger than cut threads – resists stripping |
| Heat-treated steel | Meets or exceeds OEM strength requirements |
| Corrosion-resistant finish | Extends service life in harsh environments |
| Single-use safety component | U-bolts are designed for one-time use |
| Complete set recommendations | 4 pieces per axle – balanced clamping force |
| Low MOQ (1 piece) | Perfect for individual replacement or sample testing |
| Fast delivery | 1–8 working days worldwide |
| 1-year warranty | Peace of mind on every order |
| Bulk discounts available | Contact us for fleet and wholesale pricing |
FAQs
Q1: What are the exact dimensions of this U-bolt?
A: Size: 18mm diameter × 1.5mm thread pitch × 385mm overall length
Diameter: 18mm (thread and bend radius)
Thread pitch: 1.5mm (metric fine thread)
Length: 385mm (total from bend to thread end)
Q2: How many U-bolts do I need for my truck?
A: ISUZU medium-duty trucks require:
2 U-bolts per side (passenger side and driver side)
4 U-bolts total for the complete rear axle
We strongly recommend replacing all 4 U-bolts at the same time.
Q3: Can I reuse my old U-bolts when replacing leaf springs?
A: Absolutely NOT. U-bolts are single-use fasteners. They stretch during initial torquing and will not maintain proper clamping force if reused. Never reuse U-bolts – this is a critical safety rule.
Q4: Do these U-bolts come with nuts and washers?
A: U-bolts are sold as individual pieces. We recommend purchasing new nuts and washers separately. New nuts ensure proper thread engagement and torque accuracy.
Q5: What torque specification should I use?
A: For ISUZU medium-duty trucks with 18mm U-bolts:
Typical torque range: 200-250 Nm (148-184 ft-lbs)
Always consult your factory service manual for your specific model year
Q6: What is the thread pitch – 1.5mm or 1.75mm?
A: 1.5mm (metric fine thread). This U-bolt has M18 × 1.5 threads. Verify your existing nuts match this specification.
Q7: Why do I need to re-torque U-bolts after driving?
A: New U-bolts and leaf springs settle during initial use. The clamping force can decrease as components seat together. Re-torquing after 50-100 miles ensures proper clamp load is maintained.
Q8: Will these fit my ISUZU NPR with air suspension?
A: This U-bolt is designed for leaf spring suspension. If your NPR has air suspension (air bags instead of leaf springs), this U-bolt is not compatible. Please verify your suspension type.
Q9: Do you offer wholesale pricing for bulk orders (fleet / shop quantities)?
A: Yes. Please contact us with your quantity and preferred quality level for a competitive quote. Bulk discounts available for repair shops, fleets, and parts distributors.
One-stop Isuzu truck parts supplier from China,Focus on ISUZU parts sale over 29 years .
Our address
Baishiyi Jiulongpo District, High-tech Zone,Chongqing,China.
Phone Number/Whatsapp/wechat
+8617383152089
ZCMisuzu@guanglian99.com
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