Stainless Steel Full Thread Hexagon Head Screw

Product introduction

The stainless steel external hexagonal screw has a hexagonal head and is operated by a wrench. It has high torque transmission efficiency and is suitable for high-strength locking scenarios. As high-quality stainless steel screws, made of SUS304 and SUS316, they have excellent corrosion resistance, oxidation resistance and good appearance. They are widely used in marine engineering, food machinery, medical equipment, outdoor facilities and other fields.

In practical applications, it is difficult for standard specifications to fully match diverse assembly requirements, so a large number of non-standard screws are used for special adaptation. For special structural requirements, we can develop special-shaped screws, such as external hexagonal flange, thin head structure, guide head, assembly, etc. It supports full-process customization of head size, thread specification, length and function, provides one-stop service from sample development to batch delivery, and ensures product reliability through the IATF 16949 quality system.

 

Product design and features

Hexagonal head structure: Standard hexagonal head, which can be operated with an open-end wrench, torx wrench or socket wrench. It has high torque transmission efficiency and is suitable for high-strength locking.

Full thread and semi-thread optional: Full thread or partial thread structure can be selected according to the connection thickness to meet different clamping length requirements

Optional anti-loosening design: can be used with nylon anti-loosening rings, pre-coated glue or spring washers to enhance anti-vibration performance

Excellent appearance: The stainless steel material has a bright surface and has good corrosion resistance and decorative properties without additional surface treatment.

As a representative product of stainless steel screws, external hexagonal screws, in addition to standardization, appear in a large number of non-standard screws. For scenarios that require special head heights, special-shaped flanges or unconventional sizes, they can also become an important part of specially shaped screws to meet diverse assembly needs.

 

Materials and application areas

Austenitic stainless steel: SUS304 (A2) and SUS316 (A4) are the main grades, which have excellent corrosion resistance, oxidation resistance and good comprehensive mechanical properties.

Martensitic stainless steel: SUS410, SUS420, etc., suitable for occasions requiring higher hardness

Performance levels: A2-70, A2-80, A4-70, A4-80, etc., corresponding to different strength requirements

Special materials: duplex stainless steel, high temperature resistant stainless steel, etc. can be provided upon request

Stainless steel screws are widely used in industries with high anti-corrosion requirements due to their excellent corrosion resistance:

Marine engineering and shipbuilding: SUS316 material is suitable for high salt spray and high humidity environments

Food machinery and pharmaceutical equipment: Stainless steel material meets sanitary requirements and is easy to clean and disinfect

Outdoor facilities and curtain wall engineering: strong weather resistance, no rust when exposed to the outdoors for a long time

Medical devices and instrumentation: good biocompatibility and compliance with cleanliness requirements

Chemical equipment and environmental protection engineering: resistant to acid and alkali corrosion, adaptable to harsh working conditions

Auto parts: used in high temperature or corrosive environments such as exhaust systems and engine surroundings

 

Quality control and certification system

Raw material control: 100% batch re-inspection, using a spectrometer to detect chemical components to ensure compliance with ASTM, JIS, GB and other standard requirements: Cold heading molding: dimensional SPC monitoring to ensure hexagonal head dimensions and head height accuracy

Thread forming: Thread rolling process, 100% online inspection of thread pass and stop gauges

Solution treatment: ensuring the recovery of corrosion resistance of austenitic stainless steel

Passivation treatment: removes free iron on the surface and improves corrosion resistance

 

Finished product testing:

Full size inspection: 100% optical screening of key dimensions

Mechanical properties: tensile strength, yield strength, hardness testing

Salt Spray Test: Neutral Salt Spray Test (NSS) Verifies Corrosion Resistance Level

Torque test: breaking torque, locking torque verification

 

Certification system:

ISO 9001, IATF 16949 (automotive industry quality management system)

Products meet RoHS and REACH environmental protection requirements

Material certificate, heat treatment report, salt spray test report can be provided

PPAP (Production Part Approval Process) level three document package available

For non-standard screws and screws with special shapes, we have established a special quality control process, from mold verification, first article confirmation to process capability analysis, to ensure that each customized product maintains a stable quality level even as the structural complexity increases.

 

Customized services

Customized head structure: The hexagonal head size and head height can be adjusted according to the installation space and torque requirements.

Add flange structure, replace gasket, improve bearing surface and anti-loosening effect

Design screw structures with special shapes such as thin heads, semi-round heads, low profiles, etc.

Add multiple drive form combinations such as slotting and cross recessing

Size and thread customization: Thread specifications: metric (M1.6 – M36), inch, American and non-standard threads

Length range: 3mm – 500mm, accurate to 0.1mm level

Rod structure: full thread, partial thread, stepped rod, reduced rod, thin rod, etc.

Functional integration: pre-coated anti-loosening glue (nylon, chemical glue)

Assembly design: integrated screws + flat washers + elastic washers

Sealing function: with O-ring groove or pre-coated sealant

High temperature resistance and low temperature resistance special treatment

Surface treatment: stainless steel (passivated)

Polishing, brushing, electroplating, dacromet, etc. (suitable for special appearance or additional anti-corrosion requirements)

Development mode: Supports customized drawings, reverse engineering, and joint design. Sample cycle: 5–10 days, mass production cycle: 15–25 days

 

FAQ

Q: What are the advantages of stainless steel external hexagonal screws compared with carbon steel external hexagonal screws?

A: As stainless steel screws, its biggest advantage is its excellent corrosion resistance. It can be exposed to moisture, acid, alkali, and salt spray environments for a long time without rusting without additional surface treatment. At the same time, stainless steel has good low-temperature toughness and hygienic performance, and is suitable for food, medical, marine engineering and other fields.

 

Q: How to distinguish the strength levels of stainless steel screws?

A: Common stainless steel screw strength grades include A2-70, A2-80, A4-70, A4-80, etc. Among them, A2 represents 304 material, A4 represents 316 material; 70 and 80 respectively indicate that the tensile strength is not less than 700MPa and 800MPa. Compared with carbon steel grade 8.8 (800MPa), A2-70 is slightly lower, but it is the first choice when corrosion resistance is required.

 

Q: Can you provide non-standard stainless steel external hexagonal screws?

A: Yes. One of our core competencies is the provision of non-standard screws. Whether it is thread specifications, head size, length requirements, flange structure, or assembly design, all can be customized according to customer needs.

 

Q: Under what circumstances is it necessary to develop special-shaped screws?

A: When standard external hexagonal screws cannot meet installation space constraints (such as limited head height), assembly process requirements (such as automated guidance), error-proof design or functional integration requirements, we can develop special-shaped screws. For example: with flange structure to replace gaskets, with guide heads to facilitate automated assembly, with positioning bumps for error-proof installation, with slots to adapt to operations in restricted spaces, etc.

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