Question: Which coil spring specification suits trailer suspension retrofits without over-specifying? For buyers seeking a hot-rolled stainless steel coil spring, Liangshan Jiuzhou Machinery Manufacturing Co., Ltd. lists the JZ-TH2901 with a 65mm…
At a Glance
Liangshan Jiuzhou Machinery Manufacturing Co., Ltd. presents the JZ-TH2901, a stainless steel coil compression spring listed under model number JZ-TH2901. Key data points from the supplier include a 65mm specification, hot-rolled production process, coil shape, and compression or extension load type. The stated production capacity is 5,000 units per month, with origin from China and HS code 8716900000. Packaging is via pallet or wooden box, with package dimensions 200.00cm × 40.00cm × 40.00cm and gross weight 200.000kg.
Product Description
The product name identifies it as a wholesale high quality wire spring, helical spring, stainless steel coil compression spring. The attribute list specifies use in trailer crawler or suspension applications, with sizes defined by the relationship: inner diameter - outer diameter = wire thickness (asterisk as listed by supplier). The following table consolidates the supplier-provided parameters.

| Parameter | Value |
|---|---|
| Model NO. | JZ-TH2901 |
| Specification | 65mm |
| Load Type | Compression or Extension |
| Production Process | Hot Roll |
| Shape | Coil |
| Use | Trailer Crawler or Suspensions |
| Production Capacity | 5000/Month |
| HS Code | 8716900000 |
| Transport Package | Pallet or Wooden Box |
| Package Size | 200.00cm × 40.00cm × 40.00cm |
| Package Gross Weight | 200.000kg |
| Unit Price Range | US$ 5.50 - 9.80 |
All values above are taken directly from the supplier’s listed product attributes. Buyers should note that the “Length” field is stated as “Liberty” and the “Sizes” field includes the formula for inner/outer diameter and wire thickness; exact wire diameter and free length are not specified in the provided data. The natural color finish is standard.

Applications
The JZ-TH2901 is listed for industrial use and trailer climbing ladder applications, with the “Use” field indicating trailer crawler or suspension systems. As a compression or extension coil spring, it may fit into suspension assemblies where a hot-rolled stainless steel spring is required. However, fitment for a specific trailer model or suspension design must be confirmed with the supplier, as the brief does not include load ratings, spring rate, or dimensional drawings beyond the 65mm specification.
Company Profile
Liangshan Jiuzhou Machinery Manufacturing Co., Ltd. is a supplier of trailer components, including axles, trailer legs, suspension parts, air suspension, brake chambers, and springs. The company lists this product within the Tools & Hardware, Hardware Accessories, Spring category. No additional corporate milestones or certifications are provided in the current product data.
CTA
For technical data sheets, current unit pricing, production lead times, and packaging options, contact Liangshan Jiuzhou Machinery Manufacturing Co., Ltd. through the supplier channel. Request confirmation of the 65mm specification, spring rate, and drawing tolerances before issuing a purchase order.
Disclaimer

All specifications in this brief are based on supplier-listed attributes. Final engineering approval and procurement decisions require direct supplier confirmation, including dimensional drawings, material certifications, and functional testing for the intended trailer suspension application.
Related product: Wholesale High Quality Wire Spring Helical Spring Stainless Steel Coil Compression Springs

By:SourceFactories