Stainless Steel Pressure Riveting Screws: Technical Overview and Applications

1. Definition and Characteristics

Stainless Steel Pressure Riveting Screws are specialized fasteners combining the installation efficiency of rivets with the removable/reusable capability of screws. These components feature:

• Material Composition: Typically manufactured from AISI 304 (1.4301) or AISI 316 (1.4401) Stainless Steel, providing ≥18% chromium and 8-10.5% nickel content for superior corrosion resistance.

• Mechanical Properties: Yield strength ranging 205-310 MPa (304) to 240-310 MPa (316), with tensile strength between 515-690 MPa (304) and 515-620 MPa (316).

• Surface Finish: Standard finishes include Ra 0.8-1.6μm mechanical polish or electropolished surfaces reducing friction coefficients to μ=0.15-0.20.

• Temperature Resistance: Continuous service from -200°C to +800°C (304) and -200°C to +1000°C (316) in oxidizing environments.

• Installation Parameters: Require 3-12 kN axial force for proper setting, creating 0.2-0.5mm material deformation for optimal joint integrity.

2. Application Scenarios

2.1 Transportation Industry

In rail vehicle manufacturing, these screws withstand EN 12663-1 dynamic loads while providing:

• Vibration resistance up to 50Hz frequency at 5g acceleration

• Fatigue life exceeding 10⁷ cycles at R=0.1 stress ratio

• EMI shielding through continuous metal-to-metal contact

2.2 Medical Equipment

Compliant with ISO 13485 standards for:

• Autoclavable up to 134°C for 18 minutes

• Passing ASTM G48 crevice corrosion testing

• Maintaining Ra ≤ 0.4μm surface finish for cleanroom compatibility

2.3 Marine Engineering

Certified to DNVGL-RU-0171 for offshore applications:

• Resisting 5000hr salt spray (ASTM B117)

• Maintaining torque retention after 1000 thermal cycles (-40°C to +80°C)

• Providing ≥25 years service life in splash zones

2.4 Food Processing

Meeting FDA 21 CFR 178.2010 requirements:

• Zero measurable lead content (<0.01ppm)

• Withstanding daily CIP cleaning with 3% NaOH at 80°C

• Maintaining hygienic surfaces with ≤0.8μm Ra finish

3. Maintenance Procedures

3.1 Installation Best Practices

• Use calibrated tools applying ±5% torque accuracy

• Maintain 0.05-0.10mm hole clearance

• Apply 0.2-0.5g molybdenum disulfide paste for high-temperature applications

3.2 Routine Inspection

• Check for fretting corrosion every 5000 service hours

• Verify clamp load with ultrasonic measurement (±5% accuracy)

• Monitor galvanic potential differences ≤200mV in mixed-material assemblies

3.3 Corrosion Prevention

• Passivate per ASTM A967 nitric acid method

• Apply 5-10μm PTFE coating for chemical resistance

• Maintain relative humidity below 60% RH in storage

3.4 Reconditioning

• Ultrasonic clean in 5% citric acid at 60°C

• Repair threads with 60° chasing dies

• Discard fasteners showing >10% torque reduction from baseline