3.5K Trailer Axle Double Eye Leaf Spring

• Customization: Available
• Loading Weight: 1750lbs
• Material: Steel
• Model NO.: BZ-3500lb-leaf spring
• Type: Suspension
• Surface Treatment: Bake Paint
• Components: Leaf, Clip, Center Bolt
• Finish: Black / Galvanized / Cataphoresis
• Application: Trailer Suspension Parts
• Certification: CCC, ISO/Ts16949
• Axle Number: 2/3
• Condition: New
• Transport Package: Pallet
• Specification: Standard Size or customization
• Trademark: BZ
• Origin: Shandong
• HS Code: 7320109000
• Production Capacity: 10000 Set/Sets / Month
• Package Size: 100.00cm * 100.00cm * 100.00cm
• Package Gross Weight: 570.000kg

Product Description

3.5K  Trailer Axle Double Eye leaf  Spring

This Trailer Axle Spring is the most commonly used leaf spring on 3.5k axles. 90% of trailer manufactures use this spring when building light duty utility trailers. 

Specification

Applications

light duty utility trailers

Features:

* 4 leaf double-eye spring

* Flexes to absorb road shock and provide smooth ride

* Reduces wear and tear on trailer

* Ensures level ride on bumpy and uneven surfaces

* Mounts to trailer frame with hangers or a hanger kit (sold separately)

Technical Specifications

(Custom configurations available upon request.)

Spring capacity:	1,750 lbs
Axle capacity:	3,500 lbs
Length from center to center of the eyes of spring (unloaded):	25.25"(641±3mm)
Spring width:	1.75"(44.5mm)
Bushing:	nylon bushings
Number of leaves:	4
Material:	60Si2mn
Replacement for part numbers:	UNA-212, SW4B,DE-7242

Measurement Method

Step 1:DETERMINE THE TYPE OF TRAILER SPRING 

Accurately measuring your trailer springs and choosing the correct replacements is important for the function of your trailer and will make the job of replacing them much easier. Using replacement trailer springs with the correct length will keep the axle in the same position, eliminating the need to move guards or suspension components like spring hangers. Matching your weight capacity, arch, and leaf count will keep the ride height of the trailer the same and keep the ride characteristics the same. 

Step 2: MEASURE THE WIDTH OF THE TRAILER SPRING

 
 

Measure the width of the spring. The majority of trailer springs for boat, motorcycle, horse, camping, flatbed, and utility trailers are 45mm wide.  To determine the width, simply measure along the center of the top leaf.

Step 3:MEASURE THE LENGTH OF THE TRAILER LEAF SPRING

Measure the length of the trailer leaf spring. If you are replacing a spring, getting the same length is important. To measure the free length, refer to letter "C" above. It is important that your trailer is unloaded when measuring the length. When determining length (C), measure from the center of one spring eye to the center of the other spring eye for double eye trailer springs. Measurements will vary depending on the age and fatigue of your spring. We offer a large selection of trailer springs. Determining the length first will narrow your selection down considerably and make finding the correct spring quicker.

Step 4:DETERMINE THE CAPACITY OF THE SPRINGS

Determine the rating of your trailer axle and then select the capacity of your springs. If you have a 1500 Kg. rated trailer axle with two springs, you will use two 750 Kg. rated trailer springs or higher. Please note, the capacity ratings are for each individual trailer spring.
Once you have determined the capacity, and number of springs, count the number of steel leafs your current springs have. If you are replacing all of your springs, the number of leafs will not be as important. You can switch from a 4 leaf to a 3 leaf trailer spring with thicker steel if you prefer.

Step 5:MEASURE FREE OPEN AND ARC OF THE TRAILER SPRING

Measure the free open (H) and the arc (A) and (B) of the trailer spring. These measurements are more for reference and will change with the age and fatigue of your spring. These measurements can show you the importance of replacing all of your springs rather than one at a time. If you have an older spring that has lost its arc over time and you add one new spring with a taller arc to the other side of your trailer, your trailer will lean to one side causing for an uneven load and unsafe conditions.
 
NOTE:
All trailer springs are sold individually, but it is highly recommended to change them in pairs.

Packaging & Shipping

Certifications

Company Profile

SHANDONG NORTH AUTOTECH CO. Ltd 

SHANDONG NORTH AUTOTECH CO. Ltd is a professional manufacturer of steel wheels and trailer parts in Zibo City, Shandong Province, China.
We specialized in manufacturing all kinds of electric axles, steel wheels and trailer parts, designed for use on Light Duty Trailers. Like as Utility Trailer Axle, Boat Trailer Axle, Car Haulers Trailer Axle, ATV Trailer Axle, Lawn & Landscape Trailer Axle, Motorcycle Trailer Axle, BBQ Pit Trailer Axle, Cargo Trailer Axle, Enclosed Trailer Axle, RV Trailer Axle & More. We can supply many trailer parts & accessories as follows: Towbars, axles, brake drums, hubs, brake disc, bearings, springs and springs and suspension kits, couplings, mudguards, U-Bolts, Jockey Wheels, keel rollers and brackets, wobble roller, wheel spacer, equalizers. Based on good and steady-going quality, competitive prices and better services, most of our products are well exported to North America, Europe and Oceania. The company has strong technical force, sophisticated manufacturing equipment, professional production team, for product innovation, research and development, quality assurance provides a solid backing.

Why Choose Us?

Other Products

OEM/ODM capabilities
Competitive pricing & bulk discounts
Fast shipping & customs clearance support
Turnkey project solutions

Trailer Axle from 3500-15000LBS
Brake Assembly
Trailer Wheel Hub
Hanger Kits( Include HDSS)
Landing/Electric Jack

FAQ

Q: What's the lead time for orders?
A: Standard models ship in 15–30 days; customized units require 30–45 days.
 
Q: What is your terms of delivery?
A: EXW, FOB, CFR, CIF, DDP.
 
Q: Can I request a customized Leaf Spring size?
A: Absolutely! We offer tailored attachments.
 
Q: What documents do you provide for export?
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).
 
Q: How do I place an order?
A: Contact us via email/phone for a quote, then confirm with a PO.
 
Q:How do you make our business long-term and good relationship?
1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.

Exhibition