I. Product Overview

This precision spring assembly is made of high-quality, high-temperature-resistant stainless steel spring wire, fully automatically wound into a multi-section variable diameter helical structure. Different pitch sections are designed to meet graded pressure requirements. The ends of the spring are processed into a single integrated internal thread, allowing direct screw connection and fixation with the equipment's screw shaft. Internally, a solid guide center rod is paired to prevent lateral bending and twisting failure during compression. A matching metal limiting washer precisely limits the maximum compression stroke, preventing the spring from being compressed and permanently plasticized. The entire assembly is heat-treated to relieve internal stress, ensuring that after tens of thousands of cycles of compression and rebound, the spring force does not degrade. The stainless steel material is resistant to moisture and corrosion, suitable for dry and wet varying working conditions. The kit is pre-assembled at the factory, allowing customers to install and use it directly upon receipt, eliminating the need for sorting and assembling parts.

Customizable steel wire thickness, spring total length, segmented structure, elasticity coefficient, and both-end thread specifications are available. The entire assembly can be developed to 1:1 replicate customer samples. After pre-production testing for initial elasticity and stroke durability, mass pre-assembly production follows, with full-process detection and control of resilience, dimensional accuracy, and rust resistance.

II. Core Highlights of Craftsmanship

1. Numerical control full automatic spring winding and integral forming, segmented elasticity even and controllable
   Multi-section variable pitch thread winding, both ends with precision internal threading, excellent concentricity, compression and rebound throughout the process are vertically unshifted.
2. High-temperature stress-relieving tempering process, significantly improved fatigue durability
   After winding, the overall isothermal tempering eliminates the internal stress of the wire, ensuring long-term reciprocating expansion and contraction without fatigue and relaxation, with a service life far exceeding that of ordinary cold rolled springs.
3. Axle rod + limit washer double protection, prevent spring compression and damage
   Built-in guide rods limit lateral deformation, locking rings secure the maximum compression distance, effectively avoiding permanent failure caused by overload compression, significantly extending the service life of the components.
4. Two-end threaded structure, easy and firm assembly and disassembly
   Quickly connect equipment fasteners with both male and female threaded holes; assembly is stable and not prone to loosening, with easy and convenient maintenance and disassembly later on.

Section 3: Optional Customizable Raw Materials

1. 304 Stainless Steel (Recommended)
   Anti-rust and corrosion-resistant, moderate toughness, suitable for both dry and wet environments, the preferred material for household appliances and precision instrument springs.
2. 65Mn manganese spring steel
   High elasticity, large load-bearing capacity, cost-effective choice for heavy-duty, high-frequency reciprocating compression conditions.
3. Qin steel wire SWP-B
   Top fatigue resistance, nearly no attenuation in million times reciprocating resilience, for high-end precision equipment.
4. 316 Stainless Steel
   Excellent resistance to acidic and alkaline salt mist, suitable for humid and slightly corrosive conditions.

4. Optional Surface Treatment Processes

• Stainless Steel Original Passivation (Actual Shot Blasting Process): Original anti-rust, no coating peeling, high cleanliness suitable for precision electrical equipment.
• Electroplated zinc: Carbon steel spring base anti-rust treatment, suitable for indoor dry operating conditions.
• Blackening: Dull, wear-resistant, internal structural parts for industrial machinery
• Nickel Plating: Stronger anti-corrosion, neat and exquisite appearance for accessories selection

V. Applicable Application Scenarios

✅ Various precision testing instrument telescopic reset elastic assembly
Electric rice pot, temperature controller, etc. appliance core top spring sleeve kit
✅ Automatic production line fixture buffer clamping component
✅ Small fluid valve opening and closing spring accessories
✅ Precision telescopic limit spring assembly for portable medical equipment

Six, Core Product Advantages

1. One-stop custom assembly: springs, shaft rods, washers all included, dimensions perfectly matched
2. Graded variable diameter pressure design, gradual cushioning, superior vibration and noise reduction effect.
3. Built-in guide limit structure, thoroughly solves the common problems of spring lateral bending and failure due to compression and merging.
4. Multiple material options available, suitable for anti-rust, heavy load, and high-frequency durability in various usage scenarios
5. Support for small batch sample debugging of elastic travel, bulk pre-installed delivery, higher installation efficiency

Section 7: Common Procurement FAQs Q&A

Q1: Can the spring tension be adjusted to larger or smaller sizes as required?
A: Yes, the elasticity coefficient and compression stroke can be accurately adjusted by changing the wire diameter, the middle diameter of the spring, and the number of turns.
Q2: Which material is recommended for long-term use in a humid and wet environment?
A: Preferably use 304/316 stainless steel material, resistant to moisture and rust, which will not rust or jam over long-term use.
Q3: Can we customize a variable diameter spring item without the shaft rod?
A: Supportable for independent spring production, as well as freely combining kits with adjustable washers and screw accessories as needed.
Q4: Can non-standard fine pitch threads be customized for both ends?
A: M1~M10 metric fine threads and non-standard internal threads can be turned and shaped into finished products.