2025-06-13 18:23:32
D-Shape Pins, also known as D-shaped retaining pins or D-pins, are specialized Fasteners characterized by their unique cross-sectional shape resembling the letter "D." These pins feature a flat side and a rounded side, providing secure retention while allowing easy insertion and removal. Manufactured from high-strength materials such as carbon steel (Grade 8.8, tensile strength 800 MPa), stainless steel (AISI 304, corrosion resistance up to 500 hours salt spray), or titanium alloys (Ti-6Al-4V, yield strength 830 MPa), D-Shape Pins are engineered for precision alignment and load-bearing applications.
Key Characteristics: The flat surface prevents rotation within mating components, while the rounded side ensures smooth insertion. Typical tolerances range between ±0.025 mm for precision-ground variants, with surface finishes achieving Ra 0.8 μm to reduce friction.
Anti-Rotation Design: The flat side provides up to 90% greater torsional resistance compared to standard round pins, with tested shear strength exceeding 1,200 N/mm² in hardened steel variants.
Precision Fit: Manufactured to ISO 8734 standards with diameter tolerances of h8 for press-fit applications, ensuring 0.01-0.03 mm interference fits in most industrial applications.
Load Capacity: Axial load ratings range from 2,500 N (carbon steel) to 1,800 N (stainless steel) for 5mm diameter pins, with fatigue life exceeding 10⁶ cycles at 70% of ultimate load.
Temperature Resistance: Special alloys maintain structural integrity from -50°C to +300°C, with ceramic-coated variants extending this range to 800°C for aerospace applications.
D-Shape Pins serve critical functions across industries:
Used in transmission assemblies (withstand 400 N·m torque), gearbox linkages, and suspension components where vibration frequencies up to 2,000 Hz require secure retention. BMW's modular engine platforms utilize 6.5mm D-pins with Zn-Ni coating (12μm thickness) for corrosion protection.
Critical in wing flap mechanisms (load cycles >500,000) and turbine blade retention. Airbus A350 employs Ti-6Al-4V D-pins with 0.5μm surface finish to prevent stress concentrations.
In CNC tool changers (positioning accuracy ±0.005 mm) and robotic arm joints subject to 10⁸+ cycles. Fanuc robots use hardened D-pins (HRC 60-62) in their J3 axis assemblies.
For surgical robot articulations (cleanroom-compatible 316L stainless steel) and MRI-compatible titanium implants requiring non-magnetic properties (<1.05 μ).
Precision PCB alignment pins (0.3mm diameter tolerance) in SMT equipment, with beryllium copper alloys (conductivity 22% IACS) for ESD protection.
Proper care extends service life by 300-400%:
Ultrasonic clean with pH-neutral solvents (7.0-8.5) at 40-60°C for 5-10 minutes
Remove debris using 0.3μm filtered compressed air
For medical applications: autoclave at 134°C for 18 minutes
Apply MIL-PRF-81322 grease (4-6μm film thickness) for high-load applications
Dry film lubricants (MoS₂, 5-10μm coating) for vacuum environments
Re-lubrication intervals: every 50,000 cycles or 6 months in standard conditions
Check for wear using go/no-go gauges (ISO 8020)
Measure flatness with optical comparators (0.001 mm resolution)
Replace if diameter reduction exceeds 0.5% of nominal size
Maintain 30-50% RH with VCI packaging
Separate by material to prevent galvanic corrosion (ΔV <0.15V)
For long-term storage: nitrogen-purged containers
Use arbor presses (0.01 mm/s feed rate) for precision insertion
Align flat side with reference datum (±0.5° angular tolerance)
For removal: hydraulic extractors (max 20 kN force)
Room 101, Building 6, No. 43, Kwai Ching Road, Qingxi Town, Dongguan City, Guangdong Province, China
+86 13620070919 +86 13580778676
Dongguan Tianci Screw Products Co., Ltd, founded in May 2009, is an industrial manufacturing plant.
Specializing in the development and production of standard, non-standard fasteners customized, pressure riveted parts, shaped bolts and nuts, precision small hardware and so on.
