Stainless Steel Locking Screws With Articulated Structure

Product introduction

Stainless steel movable screw is a special fastener with a swingable connection function. Its head has a ring-shaped or U-shaped structure and is hinged with the shaft, allowing the connected parts to swing freely within a certain angle. The whole body is made of high-quality stainless steel, which has both high strength and excellent corrosion resistance.

 

Product features

Articulated structure: The head and shaft are jointly connected, which can achieve a swing angle of 0°~180°, and is suitable for connection scenarios that require joint movement;

Ring or U-shaped head: The head is designed in a ring or U-shape and can be used to connect flexible or rigid components such as wire ropes, chains, and tie rods;

Threaded shaft: The shaft is equipped with precision threads that can be matched with nuts or threaded holes to achieve an adjustable fastening connection;

Flexible swing: The joint parts are precision machined, rotate flexibly and without jamming, and maintain good swing performance after long-term use;

High strength and corrosion resistance: Made of stainless steel, it has excellent corrosion resistance while withstanding tensile and shear forces.

 

Materials and application fields

304 stainless steel: general-purpose austenitic stainless steel, with good corrosion resistance and comprehensive mechanical properties, suitable for most indoor and outdoor environments, and is the most commonly used stainless steel non-standard parts material;

316 stainless steel: Added molybdenum element makes it more resistant to chloride ion corrosion and is suitable for high-corrosion environments such as coastal areas, marine engineering, and chemical equipment;

303 stainless steel: high sulfur content, excellent cutting performance, suitable for complex structures that require precision machining;

410/420 stainless steel: martensitic stainless steel, which can increase its hardness through heat treatment and is suitable for scenes with special requirements for strength.

 

Application areas:

Ship and marine engineering: used for articulated connections of hatch covers, portholes, and deck equipment, resistant to seawater corrosion;

Industrial automation: used in robot joints, pneumatic connecting rods, conveyor belt tensioners and other parts that require swing connections;

Medical equipment: such as operating light brackets, hospital bed adjustment mechanisms, rehabilitation equipment joints, etc.;

Outdoor facilities: such as awning brackets, clothes drying racks, fence door hinges, etc.;

Stage equipment: adjustable connectors for lighting stands and audio hangers;

Fitness equipment: treadmill folding mechanism, joint parts of strength training equipment;

Furniture hardware: hinged connectors for folding tables and folding chairs.

 

Quality control and certification system

Raw material control: All stainless steel materials come with a material certificate, and the composition is verified by a spectrum analyzer to ensure compliance with 304, 316 and other brand standards. Each batch of 304 stainless steel non-standard parts can be traced;

Dimensional accuracy control: Key dimensions (joint aperture, head width, shaft diameter, thread accuracy, total length, swing angle range) are fully inspected or AQL spot-checked using professional measuring tools such as image measuring instruments, three-dimensional coordinate measuring machines, and pass-and-stop gauges;

Swing performance test: Each batch of products is tested for swing flexibility to ensure that the joints rotate smoothly, without jamming or abnormal noise;

 

Mechanical property testing:

Tensile strength test: verify the load-bearing capacity of the joint parts;

Shear strength test: ensure the reliability of the connection between the shaft and the joint;

Fatigue life test: simulate long-term swing usage scenarios to verify product durability;

Corrosion resistance test: According to the application environment requirements, neutral salt spray test reports ranging from 72 hours to 1000 hours are provided;

System certification: The company has passed ISO 9001 quality management system certification, and medical device products can meet the requirements of ISO 13485, ensuring that each batch of special-shaped stainless steel screw parts has complete traceability.

 

Customized services

Size customization: the joint aperture, head width, head thickness, shaft diameter, thread specifications (metric, imperial, American), thread length, and total length can all be customized according to customer drawings or samples;

Head shape customization: In addition to standard ring heads, special head shapes such as U-shaped heads, double-ear heads, single-ear heads, and heads with pins can also be customized;

Swing angle customization: The swing angle range can be customized according to usage requirements (0°~180° or limit angle);

Thread form: full thread, half thread, fine thread, coarse thread, etc. can be designed;

Material customization: 304, 316, 303, 410 and other stainless steel materials can be selected according to special requirements such as strength, corrosion resistance, and non-magnetism;

Customized surface treatment: stainless steel natural color, passivation, electrolytic polishing, brushing, mirror polishing, black chrome plating, etc.;

Accuracy level customization: Different tolerance levels (precision level, ordinary level) can be customized according to assembly requirements;

Packaging method: anti-static packaging, customized labels, bulk or pallet packaging can be provided to meet the needs of automated assembly lines.

 

FAQ

Q: What are hinge screws? How is it different from ordinary screws?

A: The head and shaft of the movable screw are articulated in design and can swing to a certain angle, and are used to connect parts that require relative movement; while ordinary screws are rigidly connected and cannot swing. Therefore, movable joint screws are special-shaped stainless steel screw parts, which are functionally different from traditional fasteners.

 

Q: Is this screw a standard part?

A: No. Sliding screws are stainless steel non-standard parts. There are no unified standard specifications on the market. They need to be customized and produced according to the customer's specific size, head shape, swing angle and other requirements.

 

Q: As a customized non-standard stainless steel part, what is the minimum order quantity?

A: The minimum order quantity depends on the complexity of the product and the production process. When using the cold heading molding process, it is recommended that the minimum order is 5,000-10,000 pieces; when using CNC turning or centering machine processing, small batch customization of dozens to hundreds of pieces can be supported.

 

Q: How long is the production cycle generally?

A: It usually takes 10–20 working days for small batch customization, and about 20–30 working days for large batch orders depending on the specific quantity. If a new mold is needed, an additional 10-15 days of mold production cycle is required.

 

Q: Can you provide a mechanical property test report?

A: Yes. Test reports on tensile strength, shear strength, fatigue life, etc. can be provided for each batch of products to ensure that the special shape stainless steel screw parts meet the customer's connection reliability requirements.

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