Specializing in the production of special precision screws and nuts of various standards such as Chinese standard GB, Japanese standard JIS, British BS, American ANSI and ISO.
At present, the smallest screw diameter that our company can produce is 0.4mm, the shortest is 0.4mm, and the longest is 300CM.
2025-07-26 15:03:16
A screw is one of the six classical simple machines identified by Renaissance scientists, along with the lever, wheel and axle, pulley, inclined plane, and wedge. Fundamentally, a screw is an inclined plane wrapped around a central Shaft, converting rotational motion into linear force. This simple yet powerful mechanism has been utilized since ancient times, with archaeological evidence dating back to the 1st century BCE in screw presses for olive oil extraction.
Screws exhibit several distinctive mechanical properties that make them invaluable in engineering applications:
Mechanical Advantage: The ideal mechanical advantage (IMA) of a screw is calculated by IMA = 2πr / p, where r is the lever arm radius and p is the pitch (distance between threads). For a standard M6 screw with 1mm pitch turned by a wrench with 50mm lever arm, the IMA reaches 314:1.
Efficiency: Typical screw efficiency ranges from 30-70%, with ball screws achieving up to 90% efficiency due to reduced friction.
Load Capacity: A M12 grade 8.8 screw can withstand tensile loads up to 89 kN (20,000 lbf) before yielding.
Precision: Lead screws in CNC machines provide positioning accuracy within ±0.005 mm per 300 mm of travel.
Thread Standards: Common thread forms include ISO metric (60° flank angle), Unified Thread Standard (60°), and Acme (29°), each optimized for specific applications.
The versatility of screws has led to their implementation across diverse industries:
Fastening Systems: Structural bolts in steel buildings (e.g., ASTM A325) withstand shear forces up to 45 ksi (310 MPa).
Power Transmission: Ball screws in industrial robots handle dynamic loads exceeding 10 kN while maintaining 0.01 mm positioning repeatability.
Material Processing: Extruder screws in plastics manufacturing generate pressures up to 70 MPa at 300°C operating temperatures.
Aerospace: Titanium alloy screws (e.g., Ti-6Al-4V) in aircraft structures have strength-to-weight ratios of 240 MPa-cm³/g.
Automotive: Wheel lug Nuts are torqued to precise specifications (typically 90-120 N·m for passenger vehicles).
Orthopedic Implants: Bone screws made from ASTM F136 titanium achieve 860 MPa tensile strength with biocompatibility.
Precision Instruments: Micro-actuators use screws with 0.1 mm pitch for sub-micron positioning.
Adjustable Furniture: Lead screws in standing desks support 150 kg loads with 1 mm/s lifting speeds.
Household Appliances: Food processor blades rotate at 20,000 RPM secured by specially designed thread forms.
Proper maintenance ensures optimal performance and longevity of screw mechanisms:
Industrial Screws: Apply lithium-based grease (NLGI #2) every 500 operating hours or 6 months in high-load applications.
Precision Screws: Use ISO VG 32 way oil for linear motion systems, replenishing every 3 months in continuous operation.
Corrosive Environments: Marine-grade screws require Teflon-based lubricants with >80% water displacement capability.
Thread Wear: Measure pitch diameter using three-wire method; replace if wear exceeds 5% of thread height.
Alignment Checks: For lead screws, verify <0.05 mm/m straightness using precision levels.
Torque Verification: Critical fasteners should be re-torqued after 24-48 hours of initial installation.
Degreasing: Use ultrasonic cleaning with 60°C solvent baths for small precision screws.
Rust Removal: Electrolytic derusting at 6V DC with sodium carbonate solution preserves base metal.
Surface Protection: Apply zinc plating (5-25μm) or Dacromet coating for corrosion resistance.
Maintain 30-50% relative humidity in storage areas to prevent oxidation.
Organize fasteners using magnetic racks or compartmentalized bins with 0.5 mm size gradations.
For long-term storage, apply vapor corrosion inhibitor (VCI) paper with 0.5-1.0 g/m² inhibitor concentration.
Modern engineering has developed specialized screw variants for demanding applications:
Planetary Roller Screws: Achieve 50% higher load capacity than ball screws with 0.5 arc-minute backlash.
Self-locking Screws: Utilize nylon patches or distorted threads maintaining 150% of standard torque resistance.
Micro-threads: Watchmaking screws feature 0.25 mm diameter with 0.05 mm pitch tolerances.
Copyright © 2025 Dongguan CHEKSINE Metal Technology Co., Ltd. All Rights Reserved
