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.
2025-08-09 11:52:12
Precision Screws are specialized fasteners engineered to meet exacting dimensional tolerances, typically within ±0.01mm to ±0.05mm, with thread pitch accuracy of ±0.005mm. These components are manufactured using high-grade materials such as stainless steel (grade 303 or 304), alloy steel (grade 12.9 or 10.9), or titanium alloys (grade 5), achieving tensile strengths ranging from 800 MPa to 1,200 MPa. Surface finishes often include electropolishing to achieve roughness values (Ra) below 0.4μm, with optional coatings like black oxide or zinc-nickel plating for enhanced corrosion resistance (500+ hours salt spray tested).
Precision screws maintain tight tolerances of ISO 4753-1 Class A or DIN 912 Class 12.9, with diameter variations limited to ±0.013mm for sizes below 3mm and ±0.025mm for larger diameters. Thread forms conform to ISO 68-1 standards with lead angle deviations under ±0.5°.
High-performance alloys provide yield strengths exceeding 1,000 MPa, with thermal stability maintaining dimensional integrity across temperature ranges from -50°C to +300°C. Martensitic stainless variants achieve hardness ratings of HRC 38-42 while maintaining >15% elongation.
Advanced finishing processes achieve surface roughness below Ra 0.2μm, with coating thicknesses precisely controlled to 5-15μm for platings. Passivation treatments create chromium oxide layers 2-5nm thick for stainless variants.
Torque-to-yield ratios are optimized to 0.6-0.8 of ultimate tensile strength, with fatigue limits reaching 50% of static strength at 10^7 cycles (R=-1). Vibration resistance meets DIN 65151 standards for aerospace applications.
Used in turbine assemblies (withstanding 650°C continuous operation), avionics mounting (vibration resistance to 20G @ 2kHz), and airframe structures (meeting NASM 25027 specifications). Titanium alloy screws reduce weight by 40% versus steel equivalents.
Essential for surgical robots (positioning accuracy ±5μm), implantable devices (biocompatible ISO 5832-9 alloys), and diagnostic equipment (non-magnetic properties <1.01>).
Secure microprocessors (thermal expansion matched to PCBs with CTE of 14-17 ppm/°C), optical components (alignment stability <0.01°<>), and miniature connectors (M1.2-M3 sizes with 0.35mm hex drives).
Critical for fuel injection systems (sealing pressures to 2,000 bar<0.1mg>), and EV battery packs (galvanic isolation >1,000V).
Used in robotic arms (repeatability ±0.02mm), linear guides (preload adjustment to ±2N), and precision gearboxes (backlash control <1 arcmin="">).
Ultrasonic cleaning in 50-60°C solutions (pH 7-9) for 5-10 miNutes at 40kHz, followed by vacuum drying at 80°C for 30 minutes. Isopropyl alcohol (99.9% purity) rinses remove organic contaminants.
Apply micro-quantities (0.5-2mg) of perfluoropolyether (PFPE) grease for vacuum applications or molybdenum disulfide (0.3-1μm particle size) for high-load conditions. Torque values should be adjusted by 15-25% when lubricated.
Use optical comparators with 5μm resolution for thread profiling, eddy current testers for crack detection (50μm flaw sensitivity), and coordinate measuring machines (CMMs) for dimensional verification (0.5+L/200 μm accuracy).
Maintain at 20±2°C and 40-60% RH in VCI-treated packaging. Shelf life is 24 months for coated screws, 12 months for passivated stainless variants.
Use torque wrenches calibrated to ±2% accuracy, applying force in 90° increments for proper preload. For critical applications, measure clamp load using ultrasonic extensometers (±1% strain resolution).
Note: Always consult manufacturer specifications for application-specific requirements. Improper handling can reduce fatigue life by 50-80% and compromise dimensional stability.
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