Fastener Engineering
- Mechanical Properties Tensile strength: 60-150 ksi. Shear strength: 35-90 ksi. Yield strength: 36-130 ksi. Hardness: RC 20-45. Proof load: 65-85% tensile.
- Dimensional Standards Thread pitch: 0.5-3.0mm. Head diameter: 1.5-4× nominal. Grip length: 3-6× diameter. Thread engagement: 1-2× diameter. Washer OD: 2-3× hole.
- Material Specifications Carbon content: 0.15-0.55%. Coating thickness: 0.2-2.0 mils. Plating adhesion: >1000 psi. Surface hardness: HV 250-450. Ductility: 10-30%.
Load Analysis
- Static Forces Tension capacity: 40-80% yield. Shear loading: 25-60% tension. Bending moment: 15-40 ft·lbs. Preload: 60-75% proof. Torque factor: 0.15-0.25.
- Dynamic Loading Fatigue limit: 20-35% static. Cycle rating: 10⁴-10⁶. Impact strength: 15-50 ft·lbs. Vibration resistance: 10-50g. Frequency range: 10-2000Hz.
- Environmental Effects Temperature range: -40 to +180°F. Corrosion resistance: 500-2000hrs salt spray. Chemical resistance: pH 3-11. UV stability: 5-15 years.
Installation Parameters
- Spacing Requirements Edge distance: 1.5-3× diameter. End distance: 2-4× diameter. Row spacing: 3-6× diameter. Group effects: 0.75-1.0. Pattern efficiency: 60-85%.
- Torque Specifications Installation torque: K=0.15-0.25. Breakaway torque: +15-25%. Prevailing torque: 25-50% install. Reuse threshold: 50% original. Angle control: ±30°.
- Quality Control Hole tolerance: +0.010/-0.000". Surface finish: 125-250 μin. Perpendicularity: 0-2°. Thread fit: 2A/2B. Plating thickness: ±0.1 mil.
Performance Monitoring
- Inspection Methods Visual check: 100%. Torque audit: 10% sample. Ultrasonic: critical joints. Magnetic particle: suspect areas. Tension verification: 1% minimum.
- Maintenance Schedule Retorque interval: 6-12 months. Visual inspection: quarterly. Corrosion check: annual. Replace criteria: >5% loss. Documentation: each event.
- Failure Analysis Stress threshold: 70% yield. Fatigue life: 10⁵ cycles. Corrosion rate: <2 mils/year. Wear limit: 10% diameter. Crack propagation: <0.001"/cycle.