RAYCHIN LIMITED

Titanium Button Head Cap Screws – Comprehensive Product Range

Critical Applications of Titanium Button Head Cap Screws

International Standards & Global Designations – Titanium Button Head Cap Screws

RAYCHIN LIMITED manufactures titanium button head cap screws from vacuum arc remelted (VAR) or plasma arc melted material conforming to the most widely used national and international specifications. All material is traceable to the mill with complete certifications.

Chemical Composition (Weight %) – Titanium Alloys

Our titanium button head cap screws are produced from vacuum arc remelted (VAR) or plasma arc melted material conforming to the limits of applicable ASTM and AMS standards.

Commercially Pure Grades (ASTM F467 / B348)

Grade 5 Titanium (Ti-6Al-4V) – UNS R56400

Grade 7 Titanium (Ti-Pd) – UNS R52400

Metallurgical note: Titanium alloys are lightweight metals with density approximately 4.43-4.51 g/cm³ – about 45% lighter than steel while offering comparable or superior strength. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy strengthened through a combination of aluminum (alpha stabilizer) and vanadium (beta stabilizer), providing excellent strength, fatigue resistance, and corrosion resistance. Grade 2 is commercially pure titanium with exceptional corrosion resistance and formability, ideal for marine and chemical applications. Grade 7 contains palladium additions (0.12-0.25%) that significantly enhance corrosion resistance in reducing acids and crevice conditions. All titanium alloys exhibit exceptional corrosion resistance due to the formation of a stable, self-healing oxide layer (TiO₂) that provides protection in seawater, acids, and oxidizing environments. Titanium is completely non-magnetic and exhibits minimal gas discharge, making it ideal for semiconductor and medical imaging applications. When installing titanium button head screws, apply a small amount of anti-seize on threads to prevent galling and reduce torque requirements.

Complete Mechanical & Physical Properties – Titanium Alloys (MPa / ksi)

Titanium button head cap screws are supplied in annealed condition per applicable ASTM specifications. Data represent typical values based on industry standards.

Mechanical Properties – Titanium Alloys (Annealed Condition)

Physical Properties – Titanium Alloys

High-Temperature Mechanical Properties – Titanium Alloys

Note: For long-term service, titanium alloys are typically limited to 300-400°C due to oxidation and microstructural stability. At elevated temperatures, protective coatings such as TiAlN may be required to prevent oxidation. Grade 5 titanium is 4 times stronger than 316 stainless steel at nearly half the weight.

Exceptional Corrosion Resistance of Titanium Button Head Cap Screws

Titanium alloys are renowned for their outstanding corrosion resistance, often outperforming stainless steel in aggressive environments. The material forms a stable, adherent, and self-healing oxide layer (TiO₂) that provides protection against a wide range of corrosive media. In salt spray testing (10% NaCl), titanium exhibits corrosion rates less than 0.01 mm/year, compared to 0.1 mm/year for 304 stainless steel. Titanium is virtually immune to seawater corrosion up to 260°C (500°F) and can survive at ocean depths over a mile below the surface.

Corrosion Resistance to Common Media

• Seawater Resistance: Titanium is virtually immune to seawater corrosion up to 260°C (500°F) and at depths exceeding one mile, making it ideal for marine and offshore applications.
• Chlorine & Bleach Processing: Titanium is fully resistant to wet chlorine, chlorides, hypochlorites, chlorates, perchlorates, and chlorine dioxide – unique among metals. Widely used in pulp & paper and chlor-alkali industries.
• Pitting & Crevice Corrosion: Titanium is virtually immune to pitting corrosion in chloride environments, but at temperatures >80°C in crevice conditions, palladium-stabilized grades (Grade 7, Grade 16) are recommended.
• Stress Corrosion Cracking: Titanium alloys exhibit excellent resistance to stress corrosion cracking in most environments.
• Biocompatibility: Titanium is fully biocompatible, non-toxic, and does not elicit adverse tissue reactions, making it ideal for medical implants and surgical instruments.
• High-Temperature Resistance: Titanium maintains useful strength up to 500°F (260°C) for Grade 2 and 700°F (370°C) for Grade 5 in continuous service, with short-term capability to higher temperatures.

Manufacturing Standards – Titanium Button Head Cap Screws

All titanium button head cap screws are manufactured and tested to meet the following standards:

We offer surface finishes: plain (as-machined), passivated, anodized (blue, gold, purple, red, black), PVD coated (TiN, CrN, AlTiN), and DLC black for enhanced wear resistance. Cold-formed threads are rolled into shape, refining the metal's grain flow for a stronger, more uniform structure compared to cut threads. Precision-broached hex and Torx sockets ensure reliable tool engagement without stripping. Specialized CNC machining and thread rolling for accurate button head geometry per ISO, DIN, and NAS standards. Class 2A/3A/6g thread fit. 100% inspection available including dimensional inspection, thread verification, and non-destructive examination. Full traceability and material test reports (MTR) with mill certifications available. AS9100 and ISO 9001:2015 certified quality management. ISO 13485 certified for medical applications with cleanroom packaging available. Build-to-print specials to customer specifications are available.