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Custom Black Coated Extension Springs With Full Loop Ends

Custom Black Coated Extension Springs With Full Loop Ends
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Custom Black Coated Extension Springs With Full Loop Ends product parameters

We offer full custom spring manufacturing services for non-standard precision elastic components. We produce all types of springs, wire forms and metal stampings strictly according to your CAD drawings, and can provide professional engineering design support and tailored production solutions based on your specific application requirements.

Item	Details
Product Name	Custom Black Coated Extension Springs With Full Loop Ends
Spring Type	Coil extension springs, tension springs with full loop closed hooks, custom pull springs
Manufacturing Process	Multi-axis CNC spring coiling, loop forming, trimming, stress relief tempering, surface coating treatment
Materials Available	SUS304 / SUS316 stainless steel, high carbon spring steel, music wire, alloy spring steel; custom materials available on request
Surface Treatment	Black coating, black oxide, passivation, zinc plating, nickel plating, polishing; RoHS compliant eco-friendly finishes for export orders
Tolerance Standard	Wire diameter tolerance ±0.01mm; outer diameter, free length and loop dimension comply with ISO 10243; overall dimensional tolerance ±0.03~±0.05mm based on wire gauge
Inspection Standards	Raw material IQC, in-process IPQC, final FQC including dimension measurement, tensile force testing and appearance inspection; test reports available upon request, third-party inspection supported
Customization Service	Custom wire diameter, coil outer diameter, free length, number of coils, initial tension, full loop shape and tensile load. OEM & ODM available according to your 2D drawings, 3D files or physical samples

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Detailed description

Custom Black Coated Extension Springs With Full Loop Ends

As a professional custom extension spring manufacturer based in Dongguan, we produce precision black coated extension springs with full loop ends. All tension springs can be customized strictly in accordance with overseas customers’ 2D drawings, 3D models and physical samples. This type of pull spring is equipped with closed full loop hooks at both ends, which can deliver stable pulling force for mechanical stretching, resetting and tensioning structures. They are widely used in automation equipment, machinery assemblies, transportation components, fitness equipment, hardware tools and various tension transmission systems. We provide complete OEM & ODM customization services to satisfy diverse design demands of global industrial buyers.

CNC Precision Manufacturing Technology for Full Loop Extension Springs

Custom black coated extension springs with full loop ends are manufactured by multi-axis CNC spring coiling machines. The equipment precisely controls coil outer diameter, free length, coil count, initial tension and full loop forming dimension to ensure excellent consistency for mass production. After coiling and hook forming, springs go through trimming, deburring and stress relief tempering to eliminate internal residual stress and effectively avoid permanent elongation after repeated stretching cycles.
Automated forming guarantees reliable dimensional accuracy and interchangeability during batch assembly. This mature production technology is also applicable to torsion springs, compression springs, wire forming parts and other non-standard elastic hardware.

Product Features & Industrial Advantages of Black Coated Extension Springs With Full Loop Ends

Extension springs with full loop ends are coil tension springs fitted with integrated closed loops on both sides, designed to generate pulling force under tensile load. Their core advantages in mechanical applications are listed below:
Integrated full loop end design: Firm connection for installation, convenient to hook onto supporting components, suitable for frequent stretching movement;
Black coated surface: Enhances wear resistance and anti-rust performance, improves appearance and extends service life under normal working conditions;
Stable tensile performance: Maintains consistent pulling force after long-term cyclic stretching with low fatigue failure risk;
Highly customizable parameters: Wire diameter, coil size, free length, initial tension and hook style can be adjusted freely to match your equipment requirements;
Compact coil structure, easy installation, helping simplify product structure and reduce overall assembly costs.
Unqualified coil precision and deformed loop ends will cause uneven tension or detachment during operation. High-precision custom extension springs are vital to guarantee stable long-term operation of machinery.

Our One-Stop Custom Manufacturing Solutions

We support full-parameter customization of black coated extension springs with full loop ends, serving automation manufacturers, machinery factories, hardware suppliers and engineering enterprises worldwide.
Our product range covers miniature small tension springs, medium-load pull springs, heavy-duty machine extension springs, and non-standard full loop extension springs customized for special equipment.
Each extension spring is processed via CNC coiling, loop forming, tempering, deburring and surface anti-corrosion coating. All technical indicators can be adjusted according to your specifications. Besides single extension springs, we can supply matching fasteners, brackets and other hardware accessories to streamline your procurement and assembly workflow.

Core Advantages of Our Custom Black Coated Extension Springs With Full Loop Ends

Precise Dimension Control & Stable Tensile Performance

Manufactured by multi-axis CNC spring coiling equipment. Wire diameter tolerance reaches ±0.01mm. Coil size, free length and full loop dimension maintain high consistency; overall dimensional tolerance controlled within ±0.03~±0.05mm depending on wire gauge. Finished springs deliver steady tensile force during long-term mass application.

Highly Flexible Parameter Customization

We customize wire diameter, coil outer diameter, free length, number of coils, initial tension, full loop shape and tensile load according to your installation space, tension requirements and assembly conditions. No secondary modification required after installation to shorten your product development cycle.

Multiple Material & Surface Treatment Options

Available materials: SUS304, SUS316 stainless steel, high carbon spring steel, music wire, alloy spring steel. Optional black coating, black oxide, zinc plating, nickel plating and other surface treatments to strengthen rust and wear resistance. Stainless steel options adapt to humid and slightly corrosive working environments. All surface treatments comply with RoHS and REACH environmental standards for European and American export markets.

Flexible Order Quantity & On-Time Delivery

We accept prototype small-batch trial orders as well as large bulk orders. Uniform strict quality standards are implemented for all orders. Stable automatic production lines support long-term repeat orders from global clients.

OEM Custom Service Scope

We provide integrated customized solutions for extension springs and all types of industrial elastic components.
Material selection: SUS304/SUS316 stainless steel, high carbon spring steel, music wire, alloy spring steel. Our engineers recommend suitable raw materials based on tensile load, working temperature, anti-corrosion demand and budget.
Product range: Full loop extension springs, side hook tension springs, compression springs, torsion springs, wire forming clips, stamping springs and non-standard custom elastic hardware.
Surface treatment: Black coating, black oxide, passivation, zinc plating, nickel plating, polishing, sandblasting. RoHS-compliant eco-friendly surface treatment available for overseas shipments.
Service mode: Develop processing solutions based on drawings or physical samples. Support sample confirmation before mass production to verify dimensions, tensile performance and assembly effect.

Typical Application Scenarios

Our custom black coated extension springs with full loop ends are widely applied in mechanical tension assemblies, automation equipment stretching structures, fitness equipment components, agricultural machinery, transportation spare parts, hardware tools and all kinds of stretching reset & tension transmission mechanisms.

Frequently Asked Questions

FAQ 1

Q: Can you produce custom springs and wire forming parts according to my drawings or samples?
A: Yes, we mainly focus on OEM & ODM customized spring manufacturing services. We accept 2D files like PDF/DWG and 3D files such as STEP, IGES. You can also send physical samples for us to reverse-engineer and optimize the structure. Our engineering team will review your design and offer professional suggestions on cost saving and manufacturability (DFM) for free.

FAQ 2

Q: What kinds of metal materials can you use for spring manufacturing?
A: We support a full range of common elastic metal materials, including 304/316 stainless steel, high carbon steel, music wire, alloy steel, phosphor bronze, beryllium copper and brass. We can select suitable raw materials based on your product usage, working environment, elasticity requirements and budget.

FAQ 3

Q: Can I get trial samples before mass production? How long is the sample lead time?
A: Trial samples are available for all custom spring orders. The sample production cycle is 3–7 working days after drawing confirmation. After you test and confirm the sample dimension, force value and performance, we will arrange mass production. Small batch trial orders are also acceptable if you do not need large volume at first.

FAQ 4

Q: What surface finishing options do you provide for custom springs and elastic parts?
A: We offer multiple surface treatments to meet anti-rust, anti-corrosion, wear resistance and appearance demands: zinc plating, nickel plating, black oxide, passivation, powder coating, electrophoresis, sandblasting and polishing. If your products are exported to Europe, we can provide surface treatment that complies with RoHS and REACH standards.

FAQ 5

Q: How do you control the tolerance and quality of custom industrial springs?
A: Our standard wire diameter tolerance for general springs is ±0.01mm, with spring force value tolerance controlled within ±5%. We carry out strict three-step quality inspection: IQC for raw material incoming check, IPQC for in-process production monitoring, and FQC full dimension & force testing before shipment. We provide inspection reports and accept third-party quality inspection as requested.

FAQ 6

Q: What types of springs and elastic components do you support customization for?
A: We cover full-category custom elastic hardware, including compression springs, torsion springs, extension springs, wave springs, flat springs, spring clips, shrapnel, custom wire forming parts and various non-standard elastic stampings. No matter conventional standard springs or special-shaped custom elastic parts, we can provide targeted manufacturing solutions.

About our company

Dongguan Lanbo Electronic Technology Co., Ltd. (Brand: LAMBOOR) was established in 2010 with 15 years of experience in precision hardware manufacturing. We own a 3,000 sq.m standardized factory and employ over 100 professional technicians, acting as an integrated one-stop manufacturer specializing in custom precision hardware structural components, covering mold development, stamping, sheet metal, CNC turning, welding and dust-free assembly.

We are fully equipped with Jinfeng/Aomate stamping machines, laser cutting machines, CNC bending machines, together with complete QC testing equipment including 2D projectors, salt spray testers and tensile testers. Certified to ISO9001:2015, we hold multiple utility model patents for hardware molds.

Our products are widely applied in consumer electronics, optical communication, medical devices, automotive and new energy electrical industries, with more than 400 customized projects completed. We maintain long-term partnerships with renowned enterprises including KYOCERA, Foxconn and RICOH.

63% of our annual RMB 30 million revenue comes from overseas exports. Our self-developed progressive mold technology cuts processing costs by 80%. We support rapid prototyping and mass production, delivering stable, cost-effective customized hardware solutions for global clients.