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.
2025-07-12 16:27:05
Bulk machine screws are threaded fasteners designed for precision assembly in machinery, electronics, and industrial equipment. Unlike wood screws or sheet metal screws, machine screws feature uniform threading along their entire shank and require pre-tapped holes or Nuts for installation. These screws are typically sold in bulk quantities (hundreds or thousands per package) for cost-effective mass production applications.
Key Characteristics with Technical Data:
Thread Standards: Most bulk machine screws comply with ISO metric (M2-M12) or Unified Thread Standard (UNC/UNF #0-1/2"), with thread pitches ranging from 0.4mm (M2) to 1.75mm (M12).
Materials: Common materials include carbon steel (Grade 4.8-12.9 tensile strength), stainless steel (A2/A4 with 500-700 MPa tensile strength), and brass (CuZn39Pb3 with 340-490 MPa).
Head Types: Available in pan head (6-10mm diameter), flat head (82° or 90° countersink), and socket head (2-12mm hex key size) configurations.
Dimensional Tolerances: Manufactured to ISO 4759-1 or ASME B18.6.3 standards with diameter tolerances of ±0.02mm for precision fits.
Surface Treatments: Options include zinc plating (5-15μm thickness), black oxide (0.5-1.5μm), and nickel plating (10-30μm) for corrosion resistance.
Bulk machine screws serve critical fastening functions across industries:
High-strength alloy steel screws (Grade 8.8-12.9) assemble gearboxes, CNC components, and hydraulic systems. M6-M12 screws with nylon patch locking features prevent vibration loosening in dynamic loads up to 50Nm torque.
Miniature M1.6-M3 screws with captive washer heads secure PCB components, with ESD-safe coatings for sensitive circuits. Torque specifications typically range from 0.05-0.5Nm to prevent board damage.
Flange head machine screws (M4-M10) join interior trim and underhood components, often featuring Torx drive (T10-T40) for high-torque installation (10-35Nm) without cam-out.
Titanium alloy screws (Ti-6Al-4V) with NASM or MS standards withstand extreme temperatures (-55°C to 260°C) while maintaining 1,100 MPa tensile strength.
316LVM stainless steel screws provide biocompatibility for imaging devices and surgical tools, with passivated surfaces achieving <0.5μg/cm² ion release rates.
Store bulk screws in climate-controlled environments (15-25°C, <60% RH) with vapor corrosion inhibitor (VCI) packaging. Segregate different materials to prevent galvanic corrosion.
Use calibrated torque wrenches matching screw size (e.g., M6: 10Nm ±15%)
Apply threadlocker (Loctite 243 for medium strength) if vibration is present
For aluminum threads, limit engagement to 1.5x diameter to prevent stripping
For outdoor applications, specify screws with:
Hot-dip galvanizing (50-80μm zinc thickness)
Dacromet coating (8-12μm) with >1,000 hour salt spray resistance
Xylan fluoropolymer coatings for chemical resistance
Implement scheduled maintenance checks:
Ultrasonic testing for cracks in critical fasteners
Torque audits using Skidmore-Wilhelm tension measurement
Replacement of screws showing >10% thread wear
For high-temperature applications:
Molybdenum disulfide paste (up to 400°C)
Nickel-based anti-seize compounds for dissimilar metals
Dry film lubricants (PTFE) in cleanroom environments
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