Titanium Alloy Cup Head Internal Hexagonal Bolt

Product introduction

This product is a typical custom-made non-standard screw. The head adopts a cup head (cylindrical head) inner hexagonal design, which has high torque transmission efficiency and is not easy to slip. As a special shape screw, it is made of TC4/GR5 titanium alloy, with a density of only 60% that of stainless steel, and a strength comparable to grade 10.9 steel bolts. It is lightweight, high-strength, non-magnetic and has excellent corrosion resistance.

 

Products are widely used in high-end fields such as aerospace, medical equipment, and marine engineering. We focus on the R&D and production of customized special-shaped screws and titanium alloy non-standard screws. We can provide customized services for titanium alloy cold-headed non-standard parts and titanium alloy special-shaped bolts. Sizes, tolerances, and surface treatments can all be processed according to drawings. We support small batch samples and large-volume supply. Welcome to inquire about drawings.

 

Product design and features

Cup head inner hexagonal structure: The head is cylindrical (cup head), the inner hexagonal groove is evenly stressed, has high torque transmission efficiency, is not easy to slip, and is suitable for high-precision assembly operations;

Advantages of titanium alloy material: The density is about 4.43g/cm³, which is only 60% of stainless steel, but the strength is comparable to that of alloy steel, achieving significant lightweight effect;

Non-magnetic characteristics: The magnetic permeability of titanium alloy is only about 1.0002μ, completely non-magnetic, and is suitable for precision electronics, medical equipment and other occasions that are sensitive to magnetic fields;

Excellent corrosion resistance: Resistant to seawater, acid and alkali, salt spray, and performs well in highly corrosive environments such as marine engineering and chemical equipment;

High specific strength: Ti-6Al-4V (TC4/GR5) has a tensile strength of more than 895MPa and a 0.2% yield strength of more than 825MPa.

 

Materials and application fields

TC4/GR5 titanium alloy (Ti-6Al-4V): the most widely used α+β titanium alloy, with high strength, excellent comprehensive performance, tensile strength ≥895MPa, and is the mainstream material for manufacturing titanium alloy non-standard screws;

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

GR7 titanium alloy: Adding palladium element further improves the corrosion resistance and is suitable for extreme corrosive environments;

TC16 titanium alloy: has good cold heading performance and is suitable for mass production of titanium alloy cold heading non-standard parts.

 

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

Aerospace: Fastening of aircraft structural parts, engine accessories, landing gear and other key parts. The low specific gravity and high strength of titanium alloy can significantly reduce the weight of the aircraft;

Medical devices: surgical instruments, implants, rehabilitation equipment, etc. Titanium alloy has good biocompatibility, is non-toxic and does not cause allergic reactions;

Marine engineering: ships, submarines, offshore platform equipment, titanium alloy has excellent seawater corrosion resistance and can be used in the marine environment for a long time;

Military equipment: drones, armored vehicles, individual equipment, etc. Lightweight and high strength are key requirements;

High-end manufacturing: precision instruments, optical equipment, vacuum equipment, semiconductor equipment and other scenarios that have strict requirements for non-magnetic and corrosion resistance;

New energy vehicles: battery pack structural parts, motor housing connections and other parts that require lightweighting.

 

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 to ensure compliance with TC4, GR2 and other brand standards. Main component requirements of Ti-6Al-4V: Al 5.5%-6.8%, V 3.5%-4.5%, Fe≤0.30%;

Heat treatment process control: Heat treatment of titanium alloys has a significant impact on performance, and solid solution aging temperature and time need to be strictly controlled. Taking TC16 as an example, the parameters of the two heat treatments need to be accurately controlled to ensure the strength and toughness of the material;

Dimensional accuracy control: Key dimensions (head diameter, head height, hexagonal size, thread accuracy, total length) are fully inspected or AQL sampled using professional measuring tools such as image measuring machines, three-dimensional coordinate measuring machines, and thread gauges;

Hexagon groove accuracy control: The size and depth of the hexagon across the sides are measured using special gauges to ensure the accuracy of the fit with the wrench and prevent slipping;

 

Mechanical property testing

Tensile strength test: TC4/GR5 requires ≥895MPa;

Yield strength test (0.2% bearing pressure): TC4/GR5 requires ≥825MPa;

Hardness test: check the heat treatment effect;

Guaranteed load test: Verify that the bolt does not undergo significant plastic deformation under specified stress;

Metallographic inspection: Check the microstructure to ensure that the ratio of α+β phases is reasonable and there are no defects such as overheating and overburning;

Non-destructive testing: For key applications, ultrasonic flaw detection or radiographic testing can be performed to check for internal defects;

System certification: The company has passed ISO 9001 quality management system certification. Aerospace products can meet the requirements of AS9100, and medical device products can meet the requirements of ISO 13485, ensuring that each batch of titanium alloy cold heading non-standard parts has complete traceability.

 

Customized services

Size customization: Thread specifications (metric M2-M30, English, American), thread length, cup head diameter, cup head height, hexagonal size across sides, and total length can all be customized according to customer drawings or samples;

Head type customization: As special shape screws, special head types such as cup head (cylindrical head), round head, countersunk head, pan head, flange head, T-shaped head, etc. can be customized;

Material customization: Choose TC4/GR5, GR2/TA2, GR7, TC16 and other titanium alloy materials according to strength, corrosion resistance, biocompatibility and other requirements;

Precision level customization: Different tolerance levels (precision level, ordinary level) can be customized according to assembly requirements to meet the requirements of high-end fields such as aerospace and medical equipment;

Customization of thread form: coarse thread, fine thread, rolling thread, cutting thread, left-hand thread, etc. can be designed;

Customized surface treatment: titanium alloy natural color, passivation, anodizing, PVD coating (gold, blue, black), etc.;

 

Processing technology customization:

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

Hot heading forming: suitable for medium and large quantities of products with relatively simple structures;

Cold heading + secondary processing: Suitable for mass production of titanium alloy cold heading non-standard parts. It should be noted that titanium alloy cold heading has higher equipment and process requirements;

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

 

FAQ

Q: What are the advantages of titanium cup head hexagon socket bolts compared with stainless steel bolts?

A: There are three main advantages: first, lightweight, the density of titanium alloy is about 4.43g/cm³, which is only 60% of stainless steel (about 7.9g/cm³); second, high specific strength, lighter weight at the same strength; third, non-magnetic, with a magnetic permeability of only 1.0002μ, suitable for precision electronics, medical equipment and other occasions sensitive to magnetic fields; fourth, excellent corrosion resistance, especially seawater corrosion resistance.

 

Q: What is the difference between TC4 and GR5?

A: TC4 is a Chinese brand (GB/T), and GR5 is an American brand (ASTM). The chemical composition and performance of the two are basically the same. They are both Ti-6Al-4V (6% aluminum, 4% vanadium) titanium alloy, which is the most widely used titanium alloy non-standard screw material. GR5 main components: Al 5.5-6.8%, V 3.5-4.5%.

 

Q: Can titanium alloy screws be produced by cold heading?

A: Yes, but it is more difficult. Titanium alloy has a small deformation coefficient and obvious work hardening, which requires high cold heading equipment and molds. After process optimization, some titanium alloy grades (such as TC16) can use cold heading + secondary heat treatment to produce titanium alloy cold heading non-standard parts, which can improve production efficiency and reduce material loss.

 

Q: What level of strength is the TC4 titanium alloy bolt equivalent to that of steel bolts?

A: The tensile strength of TC4 titanium alloy is ≥895MPa, and the 0.2% yield strength is ≥825MPa. It is close to the strength of steel grade 10.9 bolts (tensile strength ≥1000MPa), but is about 40% lighter. This is the core advantage of titanium alloy special shape bolts in high-performance applications.

 

Q: Do titanium alloy bolts require surface treatment?

A: Titanium alloy itself has good corrosion resistance and usually does not require additional surface treatment. If you need a specific appearance (such as gold, blue, black) or further improve the surface hardness, you can perform PVD vacuum coating treatment. The color will penetrate into the metal surface and it will have strong wear resistance.

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