5/32" Precision Steel Balls – Grade 40 | Pack of 1200

Engineered Accuracy for Mechanical Integrity and Operational Efficiency

The 5/32 inch (3.97 mm) Grade 40 steel balls are built for high-performance environments where roundness, strength, and consistency are critical. Manufactured from hardened high-carbon steel and precision-finished to Grade 40 standards, these balls serve as core elements in demanding mechanical assemblies and precision components. This bulk pack of 1200 ensures you stay equipped for professional, industrial, or DIY applications.

🔧 Technical Specifications:

ParameterSpecificationDiameter5/32 inch (3.97 mm)GradeG40 (±13 microns sphericity tolerance)MaterialHardened High-Carbon SteelFinishPolished (low-friction surface)HardnessRockwell HRC 60–66Density~7.85 g/cm³Quantity per Pack1200 unitsStandard ComplianceISO 3290 / AFBMA G40

🛠️ Manufacturing and Quality Control:

Each steel ball undergoes controlled heat treatment, fine grinding, and high-speed polishing, ensuring a uniform diameter and low-friction surface. Grade 40 tolerance ensures dimensional consistency for use in medium-precision mechanical systems, with minimal vibration and wear.

🚀 Application Areas:

🔧 Mechanical & Industrial:

• Linear and rotary bearings

• Guide rollers

• Gear trains and pulley systems

• Ball transfer units

🚗 Automotive:

• CV joints, steering systems

• Gearboxes and axles

• Automotive repair kits

🔍 Precision Instruments:

• Valve systems

• Motion control assemblies

• Robotics and lab-grade devices

🎯 DIY & Recreational:

• High-powered slingshots (check local legality)

• CNC projects and 3D-printed motion systems

• Mechanical hobby kits and prototypes

⚙️ Performance Benefits:

• Consistent Geometry: Maintains roundness within microns, reducing mechanical noise and resistance.

• Surface Durability: Polished surface resists micro-abrasion during repeated motion.

• Load Bearing Strength: Withstands medium-to-heavy loads in dynamic and static applications.

• Operational Efficiency: Low rolling resistance for smoother mechanical movement and energy efficiency.