Good Quality 18-8 Stainless Steel 304 316 Hex Hexagon Socket Cap Head Captive Pa

Release time：2020-01-16 18:44 Browse：

1. Material Composition & Grade

• Constructed from premium 18-8 stainless steel (304/316 grades), featuring 18% chromium and 8% nickel (304) or additional molybdenum (316) for enhanced corrosion resistance.

• 304: Ideal for general-purpose environments (e.g., indoor machinery, food processing).

• 316: Suited for harsh conditions (marine, chemical exposure, saltwater).

2. Design Features

• Hexagon Socket Cap Head:

• Internal hex drive for high-torque transmission, compatible with Allen keys and automated tools.

• Cylindrical cap head design minimizes protrusion, suitable for flush panel mounting.

• Captive Panel Mechanism:

• Integrated washer or locking feature secures the screw to the panel, preventing loss during assembly/disassembly.

• Prevents rotation of the screw body when removing or tightening the nut.

3. Structural Advantages

• Thread engagement optimized for panel thickness, reducing the risk of stripping or over-tightening.

• Captive design eliminates the need for separate washers, streamlining installation in electronic enclosures, control panels, or machinery casings.

4. Corrosion Resistance

• Passivated surface (as standard) forms a dense chromium oxide layer, resisting rust in humid, acidic, or alkaline environments.

• 316 grade offers superior resistance to chloride-induced pitting (e.g., seawater, road salt).

5. Size & Thread Specifications

• Metric sizes: M3–M10 (diameter), lengths 6–50 mm, with fine/coarse pitch threads per ISO 4762.

• Threads rolled (not cut) for 30% higher fatigue strength and precise engagement.

6. Applications

• Electronics: Securing circuit boards, control panels, and enclosures (non-magnetic 304 suitable for sensitive devices).

• Industrial Machinery: Panel mounting in pumps, valves, or equipment requiring frequent access.

• Marine/Aerospace: 316 variants for offshore equipment, aircraft interiors, or components exposed to harsh climates.

7. Quality Assurance

• Tensile strength testing (304: ≥515 MPa; 316: ≥585 MPa) and thread gauging (GO/NO-GO) per ISO 898-1.

• Salt spray testing: 304 withstands 500+ hours, 316 exceeds 1,000 hours (ASTM B117).

8. Installation Benefits

• Reduced assembly time due to captive design (no loose washers to misplace).

• Vibration-resistant: Captive mechanism helps maintain preload in high-vibration environments (e.g., motors, generators).