Redhill Precision Specialty Balls

Stainless Steel Balls for Bearings, Valves and Pumps

REDHILL supplies precision stainless steel balls in AISI 440C, 302, 304 and 316. These grades differ in hardness, wear resistance and corrosion resistance. Therefore, selection should match the contact load, fluid and operating temperature.

AISI 440C Stainless Steel Balls

AISI 440C is a high-carbon martensitic stainless steel. Heat treatment gives it high hardness and wear resistance. As a result, it suits rolling contact and other duties that need a hard ball surface.

Typical uses include precision bearings, check valves and pump parts. In addition, 440C is magnetic. However, 302, 304 and 316 generally provide better corrosion resistance in many fluids.

AISI 302 / 304 Stainless Steel Balls

Grades 302 and 304 are austenitic stainless steels with good toughness and corrosion resistance. Heat treatment does not harden these grades. However, cold working can raise their strength and hardness.

In addition, designers use these balls in dispensing valves, fluid pumps and food processing equipment. For food and process equipment, also check compatibility with cleaning agents and cleaning temperatures.

AISI 316 Stainless Steel Balls

AISI 316 contains 2–3% molybdenum. This improves resistance to chloride-related pitting compared with 304. As a result, 316 suits tasks with higher corrosion resistance requirements. Like 304, it does not harden by heat treatment.

For example, common uses include dispensers, sprayers, lotion pumps and chemical processing equipment. However, 316 can still pit in chloride-containing fluids. Therefore, grade selection should account for fluid chemistry, temperature and cleaning conditions.

For a quotation, send us the diameter, tolerance, steel grade and quantity. Also, include the surface finish, hardness and working conditions.

Precision Ceramic Balls for Bearings and Valves

REDHILL supplies precision ceramic balls for bearings, valves, pumps and measuring devices. The range includes silicon nitride, zirconia and 99.5% alumina.

These materials differ in density, toughness, thermal expansion and resistance to chemicals. Therefore, selection starts with the speed, load, temperature and fluids in your application.

Silicon Nitride Ceramic Balls (Si₃N₄)

Silicon nitride is a widely used material for hybrid bearings, which combine steel rings with ceramic balls. At the same diameter, Si₃N₄ balls weigh about 60% less than bearing steel balls. As a result, they reduce centrifugal forces at high speeds.

In addition, silicon nitride provides electrical insulation and expands less with heat than steel. These properties help protect bearings from electrical erosion and support high-speed operation. For example, applications include electric motors, machine tool spindles, vacuum pumps and compressors.

Zirconia Ceramic Balls (ZrO₂)

Zirconia combines high strength with greater fracture toughness than alumina. In addition, its thermal expansion is closer to steel than that of silicon nitride. As a result, it suits selected bearing arrangements and precision mechanical parts.

Typical uses also include check valves, metering pumps and flow control systems. For valve and pump service, select the grade to suit the process fluid and operating temperature.

Alumina Ceramic Balls (Al₂O₃)

Alumina is the common name for aluminum oxide. REDHILL supplies 99.5% alumina balls for wear resistance, chemical resistance and electrical insulation.

For example, typical uses include valve balls, pump check valves and sealing elements. Compared with zirconia, alumina has lower fracture toughness. Therefore, material selection should account for contact loads and impact as well as wear.

For a quotation, send us the diameter, tolerance, material and quantity. Also, include the operating speed, load, temperature and process fluid so we can review the requirements.

Ruby and Sapphire Balls – for Precision Applications

To begin with, Ruby and Sapphire Balls are high-performance components used in demanding environments. Moreover, they are engineered to deliver consistent results under extreme conditions. These ruby and sapphire balls share the same chemical composition, crystal structure, and properties as natural gemstones. Manufactured from 99.99% pure Al₂O₃ (alpha aluminum oxide), synthetic sapphire is clear, colorless, and extremely pure. Therefore, it is widely chosen for applications requiring both durability and optical clarity. Furthermore, its purity ensures minimal distortion in optical systems.

In addition, sapphire balls offer a unique combination of mechanical strength and transparency. As a result, they are ideal for environments where both precision and resilience are essential. Notably, their performance remains stable across a wide range of temperatures and pressures. Because of this, they are frequently used in aerospace, medical, and metrology sectors.

Key properties:

• High wear resistance and dimensional stability
• Excellent optical transmission (visible light, infrared, ultraviolet)
• Exceptional hardness (Mohs 9)
• Corrosion and chemical resistance

Because of their anisotropic crystal structure (hexagonal system), sapphire balls are widely used in precision engineering, optics, and high-tech instrumentation. Additionally, their hemispherical counterparts are equally valuable in applications requiring partial curvature, such as sensor windows and optical domes. In contrast to other materials, sapphire maintains its integrity even under mechanical stress. Consequently, the combination of strength and clarity makes these components indispensable. In summary, sapphire balls and ruby balls continue to set the standard in advanced technological applications.

Mechanical Applications of Synthetic Sapphire Balls

To illustrate their versatility, synthetic sapphire balls are commonly found in:

• Bearings and precision valves
• Pumps and flow meters
• Metrology instrumentation
• Medical devices and probes

Optical Applications of Sapphire Balls and Hemispheres

While mechanical uses are significant, optical applications are equally important:

• Lenses and optical windows
• Fiber optics systems
• Barcode readers and scanners
• Medical imaging equipment

Synthetic Sapphire and Ruby Balls

Structurally, synthetic ruby balls are almost identical to sapphire balls; however, they differ in their chemical composition. Specifically, ruby contains a small yet significant trace of chromium. Once this element is integrated into the lattice, it not only creates the gemstone’s deep red color but also enhances its unique optical properties. In contrast, sapphire remains colorless and neutral. Consequently, synthetic ruby balls are not only visually striking but also highly functional.

In fact, their exceptional clarity, durability, and contrast make them the preferred choice in precision applications. For instance, they are widely used in laser alignment tools, medical sensors, and advanced optical systems, where superior visibility and accurate performance are essential. That said, ruby balls combine aesthetic appeal with technical efficiency. Moreover, they offer unmatched reliability in demanding environments.

Key properties:

• Extreme durability and hardness (Mohs 9)
• Non-porous and chemically resistant
• High thermal conductivity
• Corrosion resistance

Mechanical Applications of Synthetic Ruby Balls

Because of their mechanical strength, ruby balls are well-suited for:

• High-precision bearings and valves
• Pumps and flow meters
• Metrology and measurement instruments
• Medical probes and surgical devices

Optical Applications of Ruby Balls and Hemispheres

Despite their mechanical advantages, ruby balls also excel in optical systems:

• Precision lenses
• Fiber optics and photonics
• Barcode readers and laser systems
• Medical optical equipment

In conclusion, both sapphire and ruby balls offer a rare combination of strength, clarity, and chemical resistance. Overall, their performance in precision applications makes them essential components in modern engineering and optical design.

95W Tungsten Heavy Alloy Balls

High-Density Spheres and Shot for Industrial and Counter-UAS Applications

REDHILL supplies 95W tungsten balls for designs that need high mass in a small space. The heavy alloy contains nominally 95% tungsten by weight. Its typical density reaches approximately 18.0 g/cm³. As a result, these spheres offer more than twice the density of steel.

Key properties:

• High density for compact components
• Nominal tungsten content of 95% by weight
• Metallic binder to suit the material grade
• Magnetic properties that depend on composition and processing

Applications for 95W Tungsten Balls

First, define the diameter, sphericity and surface finish your design needs. Then, specify the alloy, magnetic properties and inspection documents. These details help us assess your requirements and prepare a quotation.

Tungsten Alloy Shot for Counter-UAS Applications

Manufacturers commonly describe spherical tungsten alloy pellets as tungsten shot or tungsten alloy shot. For example, specialized counter-UAS solutions use these dense components in anti-drone applications. UAS stands for unmanned aircraft system.

In addition, consistent material properties and pellet geometry help manufacturers maintain quality across production batches. Therefore, customers and suppliers should agree on composition, dimensions, inspection methods and acceptance criteria before supply.

Industrial Uses of 95W Tungsten Balls

Engineers use these balls as balancing masses, counterweights and compact mass elements in precision mechanisms and instruments. In addition, designers use tungsten heavy alloys in vibration-damping assemblies that rely on concentrated mass.

U.S. Material Standards

ASTM B777 covers high-density tungsten-based metals. For example, Class 3 includes grades with a nominal tungsten content of 95%. Related references include AMS 7725 and the legacy military specification MIL-T-21014D.

However, tungsten content alone does not prove compliance. Therefore, ask us to confirm material compliance for your order. This confirmation must address the required class, type and revision.

Request a Quote

Finally, send REDHILL the diameter, tolerances and quantity for your 95W tungsten balls. Also, include a drawing, surface requirements and any magnetic or documentation needs.

View product specifications or send an enquiry.

Non-ferrous Metal Balls and Specialty Materials

REDHILL supplies balls in cobalt and nickel alloys, tantalum, titanium, aluminum and copper. The range also includes titanium carbide and tool steel balls. Therefore, material selection starts with the wear, corrosion, temperature and load requirements of the application.

Cobalt Alloy Balls

Cobalt alloy balls suit valve and pump service that combines wear, corrosion and elevated temperature. Depending on the grade, they also resist galling and cavitation erosion. As a result, they serve in selected check valves, oilfield pumps and other fluid-handling equipment.

Tantalum Balls

Tantalum forms a protective oxide layer that resists many acids. Therefore, it suits selected chemical-handling equipment, laboratory systems and instruments. Material selection should account for the fluid, concentration and operating temperature.

Titanium Balls (Ti-6Al-4V ELI)

Ti-6Al-4V ELI combines low density with strength and corrosion resistance. The ELI grade sets tighter limits on oxygen and other interstitial impurities than standard Ti-6Al-4V. In addition, its toughness makes it useful in selected aerospace and medical designs.

MONEL Alloy Balls (K-500)

MONEL K-500 is an age-hardenable nickel-copper alloy. It combines seawater corrosion resistance with greater strength and hardness than MONEL 400. As a result, it suits pump and valve parts for marine and oilfield service.

INCONEL Alloy Balls

INCONEL is a family of nickel-based alloys. However, strength, oxidation resistance and corrosion behavior vary by grade. For example, selected grades suit hot valve service, chemical processing and flow control equipment.

Aluminum Balls

Aluminum balls provide low mass for lightweight mechanical parts. Alloy and temper determine the strength, hardness and forming properties. For example:

• 2017-T4: A heat-treated alloy for lightweight parts that need higher strength.
• 1100-H16: A commercially pure aluminum grade for selected stud-welding and fastening applications.

Copper Balls

Copper balls offer high electrical and thermal conductivity. However, oxygen content and material condition matter when choosing the grade. For example, C10200 is oxygen-free copper, while C11000 is electrolytic tough-pitch copper.

HASTELLOY Alloy Balls

HASTELLOY covers a family of corrosion-resistant nickel alloys. C-type grades use nickel, chromium and molybdenum for a range of process fluids. Therefore, specify the exact grade for chemical valves, pumps and fluid control systems.

Titanium Carbide Balls (TiC)

Titanium carbide is a hard ceramic carbide with high resistance to abrasive wear. As a result, TiC balls suit selected wear contacts and precision mechanisms. The material grade, contact load and surface finish determine suitability for the application.

AISI S-2 Rock Bit Tool Steel Balls

AISI S-2 is a shock-resisting tool steel. Its toughness suits rock bit bearings and parts that face repeated impacts. Heat treatment sets the balance between hardness and toughness. Therefore, specify the required hardness for the working loads.

M50 Bearing Steel Balls

M50 is a bearing steel that retains hardness at elevated temperatures. For example, it serves in aircraft engine bearings and precision machinery. In addition, VIM-VAR grades use vacuum induction melting followed by vacuum arc remelting to support steel cleanliness.

For a quotation, send us the diameter, tolerance, exact material grade and quantity. Also, include hardness, surface finish, operating conditions and any material certification requirements.

Tungsten Carbide Balls for Sizing, Gauging and Valves

Precision Tungsten Carbide Balls

REDHILL supplies precision tungsten carbide balls for hole sizing, gauges and valve assemblies. Cemented carbide combines hard tungsten carbide grains with a metal binder, usually cobalt or nickel. As a result, it offers high hardness, wear resistance and stiffness.

Compared with hardened steel, tungsten carbide has higher stiffness and greater resistance to abrasive wear. These properties help maintain contact geometry in tooling, gauges and valve parts.

Key properties:

• High hardness and abrasion resistance
• High stiffness under load
• High compressive strength
• A choice of binder grades for different operating conditions

Applications for Tungsten Carbide Balls

Ball Sizing

Ball sizing, also called ballizing, finishes a hole by forcing a slightly oversized ball through it. The process smooths the surface and improves control of the bore size. As a result, it can improve hole finish and roundness in suitable workpiece materials. In addition, carbide’s hardness helps the sizing tool resist wear over repeated cycles.

Gauges and Measuring Tools

Carbide balls provide wear-resistant contact surfaces for gauges, inspection tools and measuring fixtures. For example, they serve as reference spheres, contact points and ball plug gauges. In addition, high stiffness helps limit deformation under the measuring load.

Valves and Pumps

Carbide balls work with matched seats in check valves and pump assemblies. Their hard surfaces resist abrasive wear from particles in the fluid. Therefore, common uses include oilfield pumps and industrial flow control systems.

However, corrosion resistance depends strongly on the binder and the process fluid. For example, selected nickel-binder tungsten carbide grades can offer better corrosion resistance than standard cobalt-binder grades. Therefore, grade selection should consider the fluid, temperature, solids and pressure.

For a quotation, send us the diameter, tolerance, carbide grade and quantity. Also, include the surface finish and operating conditions so we can review the requirements.