Stainless Steel External Hexagonal Shrink Rod Non-Standard Screws

Product introduction

We specialize in the production of stainless steel external hexagon shrinkage screws, which are high-strength non-standard screws. Its unique design is that the diameter of the stem is smaller than the bottom diameter of the thread, and it is specially designed for precision assembly with thin plates or limited through holes. As non-standard customized screws, we can flexibly adjust the length and diameter of the shrink rod and use high-quality stainless steel to ensure that each specially shaped screw has both rust-proof performance and precise fit.

 

Product design and features

The core design of stainless steel external hexagonal shrink rod screws lies in its unique stepped rod structure - the diameter of the rod is precisely reduced and is significantly smaller than the bottom diameter of the thread. This special shape screw design aims to solve the interference problem in precision assembly:

Avoidance design: The shrink rod part can perfectly avoid the through hole of the thin plate or the groove of the slide rail, avoiding friction between the rod part and the workpiece hole wall, ensuring smooth assembly.

Positioning function: The step surface can be used as a precise positioning shoulder to achieve fastening and positioning in one go.

Weight reduction and beautiful appearance: On the premise of ensuring the connection strength, the overall weight is reduced and the appearance is more refined.

As a professional non-standard screw manufacturer, we are good at adjusting the length, diameter and tolerance of the shrink rod according to the customer's assembly space restrictions to ensure that each screw can be "just right" integrated into your design.

 

Materials and application fields

The material advantages of stainless steel screws give shrink rod screws excellent corrosion resistance and mechanical strength, allowing them to serve stably in a variety of harsh environments.

Commonly used materials:

SUS304: The most widely used stainless steel, with excellent rust resistance, suitable for general industry, electronic appliances and furniture hardware.

SUS316L: low carbon, high nickel and molybdenum stainless steel, with better resistance to pitting corrosion and acid and alkali resistance, suitable for marine engineering, medical equipment and chemical equipment.

 

Typical application areas:

Slide rail and guide rail installation: shrink rod design avoids interference with guide rail moving parts.

Electronic precision instruments: used for fixing PCB boards or structural parts that have compact internal spaces and require precise avoidance.

Auto parts: connection points that need to be avoided or positioned in engine peripheral parts and body accessories.

Photovoltaic and new energy: Connection nodes in the bracket system require special avoidance.

 

Quality control and certification system

In view of the special structure of non-standard customized screws, we have established a more stringent quality control system than standard parts to ensure that each batch of special-shaped screws has reliable performance:

Full process inspection: starting from spectral analysis of raw materials, to full dimensional image inspection after molding, to salt spray test and hardness tensile test, to ensure that the product has no cracks, the shrinkage rod size is accurate, and the thread pass and stop standards are qualified.

Key process control: In view of the characteristics of shrinkage rod parts that are prone to stress concentration, we optimize the cold heading or turning process, and perform chamfering and deburring to ensure smooth assembly without damaging the workpiece.

Qualification certification: The factory has passed the ISO 9001 quality management system certification, and the products comply with the requirements of the RoHS environmental directive. All stainless steel external hexagon shrink screws can provide material certification reports, and the entire quality can be traced.

 

Customized services

We know that standard specifications cannot meet all non-standard needs, so we provide a full range of one-stop non-standard customization services to help you overcome assembly problems.

Customization range:

Reduction rod size: Reduction rod diameter, length, and transition fillet can be customized according to the drawing to achieve precise air avoidance or positioning.

Head shape: In addition to external hexagonal, special shapes of screws such as internal hexagonal, torx head, semicircle head, etc. can also be customized.

Thread specifications: Metric, imperial, American and fine threads can be produced, and all ranges from M2 to M48 can be accepted.

Special requirements: Composite structures such as knurling, axial through holes, radial through holes, etc. can be added according to needs.

Service support: Support customization based on drawings and samples, with flexible minimum order quantities to meet R&D, proofing and mass production needs.

 

FAQ

Q: What are shrinkage screws? What is the difference between it and ordinary screws?

A: Reduced stem screw is a non-standard screw, which is characterized by a reduced diameter section in the stem that is significantly smaller than the bottom diameter of the thread. The shank of ordinary screws is usually the same as or slightly smaller than the outer diameter of the thread. The shrink rod design is mainly used to avoid thin plates, accurately position or reduce weight. It is a common screw with a special shape.

 

Q: Will the strength of the shrinking rod be insufficient?

A: No. As non-standard custom screws, our engineers will calculate the minimum cross-sectional strength based on your stress conditions during design. The shrinkage rod part usually does not bear the main shear force, but plays the role of avoidance or positioning. If you need to bear a larger load, we will recommend appropriately increasing the diameter of the shrink rod or choosing higher strength stainless steel.

 

Q: How long does it take to deliver shrink rod screws? Can small batches be customized?

A: Of course. We focus on non-standard customized screw services and support small and medium-volume orders. The production cycle of conventional non-standard products is generally 10-15 working days, depending on the complexity of the process. Urgent orders can be negotiated for expedited processing.

 

Q: Are these stainless steel shrink rod screws easy to rust?

A: We use high-quality stainless steel raw materials (such as SUS304), which have good anti-rust properties. If used in strong corrosive environments such as the seaside and chemical industry, it is recommended to use SUS316L material or passivation treatment to further improve corrosion resistance.

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