Brake Disc Bolt

ZETA titanium disc bolts are designed with a different head shape from the stock bolts and focused on better workability.The strength advantage of 64 itanium allows to increase the hanging allowance of the tool.
In addition, some of the stock disc bolts are longer than necessary, but ZETA's products are designed to reduce the weight further by changing to the optimum length.

●Hot forging, machining, and component rolling
ZETA titanium products feature a simple design with no unnecessary decorative processing.It focuses on the original purpose of titanium, and there is no unnecessary processing.Not only cutting titanium parts, but also hot forging process is applied to achieve tensile strength that exceeds material strength.The head is precision machined to ensure optimum quality, and because of the high strength of the material, it can be designed one size smaller to further reduce weight.Since the threaded part is hardened by plastic deformation, it is 1.5 times stronger than the machined thread.(The use of anti-galling agent is recommended)

●64 titanium is used
In Japan, it is commonly called "64 titanium", but in the U.S. ASTM standard calls it "ASTM B348 Gr5" (Grade 5).The notation "Ti-6AL-4V" specifies the chemical composition, which means that 6% aluminum (AL) and 4% vanadium (V) are contained in the mass fraction.It is widely recognized and used as a medical metal for implants, artificial bones, etc.Because of its strength, it is used in aircraft, space industry, nuclear industry, industrial turbines, automobile and motorcycle exhausts, and golf club heads.64 titanium alloy is the most commonly used alloy, accounting for 70% of all titanium alloys.

・Lightweight: Specific gravity is about 4.5.Intermediate between iron 7.8 and aluminum 2.8.(55-60% weight of iron)
・High strength: Tensile strength is more than 900N / mm2, comparable to 930N / mm2 of SCM435 (chromium molybdenum steel).
・Rustproof: The passive film is formed on the surface, so it does not deteriorate semi-permanently.
・Friendly to people and the environment: Since there is no concern about metal allergy, it is used as an implant and artificial bone.
・It can be also recycled.
・Beautiful: It is also used as an ornament because of its excellent corrosion resistance.
・Difficult to process: High technology is required for cutting, press forming and welding.
・High price: In addition to being a rare metal, it takes time to refine and is difficult to process.
・Seizure and galling: Weak against friction and prone to seizure and galling.

●Comparison in Strength between types of titanium and other Metals
Pure titanium: It is less expensive than other titanium alloys.Excellent in corrosion resistance but low in strength.
α alloy: Excellent in creep resistance (deformation rate against stress for a long time).Excellent in welding work, but poor in workability.
β alloy: It has the highest strength among the titanium alloys.It has excellent processability, but the production cost is very high.
α-β alloy: It has high strength, ductility and toughness, and excellent workability.ZETA titanium products are made of Ti-6AL-4V with alpha-beta alloy (tensile strength: 900N/mm2) is used.