Titanium Alloy Self-Tapping Screws

Product introduction

This product is a customized non-standard screw. It relies on the self-tapping structure to be directly screwed into the pre-drilled hole and extruded to form an internal thread. No tapping process is required to achieve quick connection. As a special shape screw, it is made of TC4/GR5 titanium alloy, with a density of only 60% of steel and a strength comparable to grade 10.9 bolts. It has the advantages of lightweight, high strength, and never rusts.

Products are widely used in medical equipment, aerospace, motorcycle modification, high-end bicycles and precision equipment and other fields. The surface can be anodized to present black, gold, blue and other colors to meet individual needs.

We focus on the customization services of titanium alloy non-standard screws and titanium alloy bolts with special shapes. The head shape, thread specifications and length can be processed according to the drawings. We support small batch samples and large batch supply. Welcome to inquire about drawings.

 

Product design and features

Self-tapping structure design: The tip of the screw is equipped with a cutting groove or a tapered guide structure, which can be directly screwed into base materials such as plastics, wood, metal sheets, etc., and the internal threads can be extruded or cut by itself without pre-tapping, which greatly simplifies the assembly process;

Advantages of titanium alloy material: Made of TC4/GR5 (Ti-6Al-4V) titanium alloy, the density is about 4.5g/cm³, which is only 60% of steel. The tensile strength can reach more than 895MPa, and the strength is comparable to 10.9 grade steel bolts. It has the dual advantages of lightweight and high strength;

Excellent corrosion resistance: Titanium alloy has natural corrosion resistance, especially resistance to seawater and chloride ion corrosion. It will not rust after long-term use in salt spray environments, and is suitable for high-corrosion scenarios such as marine engineering and medical equipment;

Non-magnetic properties: Titanium alloy has extremely low magnetic permeability and is completely non-magnetic. It is suitable for precision electronics, medical equipment and other occasions that are sensitive to magnetic fields;

Biocompatibility: TC4 titanium alloy has good biocompatibility, is non-toxic, does not cause allergic reactions, and has been widely used in the field of medical implants;

Diversified head type design: can be matched with various head types such as pan head, countersunk head, flange head, hexagonal flange head, plum blossom head, etc. to meet different assembly needs.

 

Materials and application fields

TC4/GR5 titanium alloy (Ti-6Al-4V): The most widely used α+β titanium alloy, with tensile strength ≥895MPa and excellent overall performance, it is the mainstream material for manufacturing titanium alloy non-standard screws. Medical grade TC4 ELI (Extra Low Clearance) version suitable for surgical implants;

GR2/TA2 industrial pure titanium: good plasticity and excellent corrosion resistance, suitable for scenes with high formability requirements;

Surface treatment: Anodizing (black, gold, blue, purple, rainbow and other colors), PVD coating, natural color passivation, etc. are available.

 

As customized non-standard screws, its application areas cover multiple levels of high-end manufacturing:

Medical devices: craniofacial internal fixation screws, self-tapping anchorage nails, orthopedic screws, dental implants and other surgical implants. TC4 titanium alloy self-tapping screws have been approved by the State Food and Drug Administration for craniofacial internal fixation;

Aerospace: aircraft interior parts, avionics equipment and other parts that have strict requirements for lightweight;

Motorcycle/bicycle modification: body panels, engine guards, wheel components, etc. Reducing unsprung mass can improve power response and control flexibility, and anodized color screws also meet personalized appearance requirements;

Automobile manufacturing: lightweight fastening of new energy vehicle battery packs, interior components, etc.;

High-end electronic products: notebook computers, smartphones, and precision instrument shell fixing;

Marine engineering: fastening of ship accessories, seawater pipelines and other highly corrosive environments;

Chemical equipment: reactors, pipeline flanges and other occasions that require resistance to acid and alkali corrosion.

 

Quality control and certification system

Raw material control: All titanium alloy materials come with material certificates, and the chemical composition is verified by a spectrum analyzer. TC4 (Ti-6Al-4V) main component requirements: Al 5.5%-6.8%, V 3.5%-4.5%, Fe≤0.30%, balance Ti. Medical grade products must comply with GB/T 13810-2017 standards;

Dimensional accuracy control: Key dimensions (thread outer diameter, pitch, thread angle, head size, total length) are fully inspected or AQL sampled using professional measuring tools such as image measuring instruments and thread gauges. Precision thread tolerance can reach pitch ±0.02mm, pitch diameter deviation ≤0.05mm;

Mechanical property test: tensile strength ≥900MPa (ASTM F543 standard), breaking torque test (ISO 6475 specification);

Microstructure analysis: The α+β phase ratio is controlled at 15%-25%, and the grain size is ≤5 (GB/T 13298);

Surface quality inspection: surface roughness Ra≤0.8μm, no burrs, cracks and other defects;

Corrosion resistance test: salt spray test verification, medical grade products need to be immersed in 37°C physiological saline for 30 days without pitting corrosion (ASTM F2129);

Fatigue life test: no cracks under 5 million cycles of load (ISO 14801);

System certification: The company has passed ISO 9001 quality management system certification. Medical products can meet ISO 13485 and FDA material registration requirements; aerospace products need to meet NADCAP certification. Can issue CMA/CNAS qualification test report.

 

Customized services

Size customization: Thread specifications (metric M1.6-M16, imperial, American), screw length, and head size can all be customized according to customer drawings or samples. Some suppliers support M3-M72 specification customization;

Head type customization: As special shape screws, special head types such as pan heads, countersunk heads, large round flat heads (truss heads), hexagonal flange heads, plum blossom heads, etc. can be customized;

Self-tapping structure customization: cutting self-tapping threads or extrusion self-tapping threads can be designed to adapt to the assembly needs of different base materials (plastic, wood, metal sheets);

Material customization: Select titanium alloy materials such as TC4/GR5, GR2/TA2, TC4 ELI (medical grade) according to strength, corrosion resistance, biocompatibility and other requirements;

Surface treatment customization: titanium alloy natural color, passivation, anodizing (black, gold, blue, purple, rainbow color, etc.), PVD coating;

 

Processing technology customization:

CNC turning + milling: suitable for small batches (100-1000 pieces), high precision, and customized non-standard screws with complex structures;

Titanium alloy cold heading non-standard parts: suitable for mass production (more than 5,000 pieces). It should be noted that titanium alloy cold heading has higher equipment and process requirements, which can significantly improve production efficiency and reduce material loss;

Packaging method: bulk, bagged, pallet packaging, customized labels, etc. are available. The minimum order quantity can be as low as 100 pieces.

 

FAQ

Q: What is the difference between titanium alloy self-tapping screws and ordinary self-tapping screws?

A: There are five main differences: first, lightweight, titanium alloy density is about 4.5g/cm³, about 40% lighter than steel; second, higher strength, TC4 titanium alloy tensile strength ≥895MPa, much higher than ordinary carbon steel self-tapping screws; third, never rust, titanium alloy is naturally resistant to salt spray, acid and alkali corrosion; fourth, non-magnetic, suitable for precision equipment sensitive to magnetic fields; fifth, biocompatibility, can be used for medical device implants.

 

Q: How much strength is the strength of TC4 titanium alloy self-tapping screws equivalent to steel bolts?

A: The tensile strength of TC4 titanium alloy is ≥895MPa, and the 0.2% yield strength is ≥825MPa, which is close to the strength of steel grade 10.9 bolts (tensile strength ≥1000MPa). Medical grade TC4 ELI has better performance.

 

Q: Can titanium alloy self-tapping screws be used for medical implants?

A: Yes. TC4 titanium alloy self-tapping screws have been widely used in craniofacial internal fixation, orthodontic anchorage nails, orthopedic screws and other surgical implants, and have been approved by the State Food and Drug Administration. Medical grade needs to use TC4 ELI (ultra-low clearance) material, which complies with GB/T 13810-2017 standard.

 

Q: Can you provide material certification and test reports?

A: Yes. Each batch of products can provide raw material material certificates, spectral analysis reports, dimensional inspection reports, as well as mechanical property test reports (tensile, torque), salt spray test reports, metallographic inspection reports, etc. according to customer requirements. The testing agency can issue a CMA/CNAS qualification testing report.

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