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.
2025-06-14 16:17:41
A Cup Point Grub Screw is a type of Set Screw characterized by its concave (cup-shaped) indentation at the tip, designed to create a secure grip on Shafts or components when tightened. These screws are typically headless and threaded along their entire length, with a hexagonal or Allen key drive for installation. The cup point design provides 30-40% greater holding power compared to flat point screws due to increased surface deformation at the contact point.
Key Technical Specifications:
Material: Typically manufactured from alloy steel (Grade 8.8 or 12.9) with a tensile strength of 800 MPa to 1200 MPa, or stainless steel (A2 or A4) with corrosion resistance up to pH 4.5-8.5
Hardness: Heat-treated to 32-39 HRC (Rockwell C scale) for optimal wear resistance
Thread Pitch: Standard metric coarse thread with pitches ranging from 0.35mm (M2) to 3.0mm (M24)
Point Angle: Concave cup angle of 100-120 degrees for optimal material displacement
Cup Point Grub Screws are widely used in mechanical systems requiring secure axial fixation:
Power Transmission Systems: Used in gear hubs, pulleys, and sprockets with shaft diameters from 3mm to 150mm, handling rotational speeds up to 10,000 RPM
Precision Machinery: In optical equipment and CNC machines where positional accuracy within ±0.01mm is required
Automotive Components: For securing steering column joints, transmission gears, and turbocharger shafts, withstanding vibrations up to 15g acceleration
Aerospace Applications: In aircraft control systems where screws must maintain grip under temperature fluctuations from -55°C to +150°C
Medical Equipment: For securing components in MRI machines and surgical robots, requiring non-magnetic materials with <0.01% magnetic="" permeability="">
Proper maintenance ensures optimal performance and longevity of Cup Point Grub Screws:
Installation Best Practices:
Clean both screw threads and tapped hole with 99% isopropyl alcohol to remove contaminants
Apply thread locker (e.g., Loctite 243) with viscosity of 500-800 cP for sizes below M6
Use a calibrated torque wrench with accuracy of ±3% of target value
For critical applications, perform ultrasonic measurement of clamp load (target 75-90% of yield strength)
Periodic Maintenance:
Inspect every 500 operating hours or 6 months (whichever comes first) for industrial applications
Check for fretting wear using a microscope with 50x magnification - replace if wear exceeds 0.1mm depth
For stainless steel screws in marine environments, apply corrosion inhibitor with ≥85% zinc content annually
Re-torque after 24-48 hours of initial installation to compensate for material creep
Removal Techniques:
For stuck screws, apply penetrating oil with ≤0.5μm particle size and allow 30 miNute dwell time
Use impact driver with 0.5-2J energy setting to break corrosion bonds
For damaged heads, employ left-hand drill bits with 118° point angle and 800-1200 RPM speed
When working with Cup Point Grub Screws in extreme conditions:
In cryogenic applications (-196°C), use austenitic stainless steel with ≥35% nickel content
For high-temperature environments (up to 650°C), specify nickel-based alloys with ≥20% chromium
In vacuum systems, select materials with outgassing rates <1×10^-6 torr="">
For food-grade applications, use screws with surface roughness Ra ≤ 0.8μm to prevent bacterial growth
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