Socket Head Cap Screws (AISI 304)
Heavy-duty equipment, structural frames, and industrial assemblies rely on fasteners that balance strength, precision, and durability. The AISI 304 stainless steel socket head cap screw stands out as a high-performance option—combining corrosion resistance, tight tolerances, and reliable load-bearing capacity for critical connections.
Here we will go through the key features, material advantages, applications, installation tips, and selection criteria for AISI 304 socket head cap screws, helping you choose the right fastener for long-lasting, high-precision assemblies.
Why Choose AISI 304 Socket Head Cap Screws?
Socket head cap screws (SHCS) are designed for applications where precision, strength, and a low-profile finish matter. Unlike standard bolts, their recessed socket head (typically hex drive) allows for tight, flush installation, critical for machinery, tooling, or structures where protruding heads could interfere with operation.
AISI 304 stainless steel elevates this design:
- It resists corrosion from moisture, chemicals, and environmental exposure (unlike carbon steel fasteners).
- Its high tensile strength (≥515 MPa) supports heavy loads in industrial/structural uses.
- Tight manufacturing tolerances ensure consistent fit and alignment across assemblies.
For projects that demand both performance and longevity, AISI 304 SHCS are a superior choice over generic fasteners.
Key Features of the M16×28 AISI 304 Socket Head Cap Screw
This specific fastener (M16×28) is engineered for precision and reliability, with the following defining features:
- Thread Spec: M16 (16mm diameter) with standard metric threading, compatible with M16 nuts/holes.
- Length: 28mm (usable length for fastening), with a ±0.2mm length tolerance for consistent fit.
- Diameter Tolerance: ±0.1mm (ensures tight alignment in pre-drilled holes).
- Head Design: Low-profile socket head (hex drive) with a 45° chamfer for smooth insertion.
- Surface Finish: Natural AISI 304 stainless steel (no additional coating needed—resists corrosion inherently).
These tight tolerances make it ideal for applications where even minor misalignment could compromise performance (e.g., machinery, structural brackets).
Material Advantages: AISI 304 Stainless Steel
AISI 304 is a widely used austenitic stainless steel, valued for its balance of strength and corrosion resistance. Its chemical composition (per industry standards) ensures consistent performance:
| Standard | Carbon (C) | Chromium (Cr) | Nickel (Ni) |
| AISI 304 | ≤0.07% | 17.5–19.5% | 8.0–10.5% |
Key material benefits:
- Corrosion Resistance: Resists rust, oxidation, and mild chemical exposure (suitable for outdoor/industrial environments).
- Tensile Strength: Supports heavy static/dynamic loads (common in structural frames or equipment).
- Durability: Maintains performance in temperature ranges from -200°C to 300°C (compatible with extreme environments).
Ideal Applications for This Fastener
The M16×28 AISI 304 socket head cap screw is tailored for high-demand use cases, including:
- Industrial Machinery: Securing gearboxes, brackets, or moving components (where precision and strength are critical).
- Structural Assemblies: Joining metal frames, supports, or outdoor structures (resists weather-related corrosion).
- Tooling & Fixtures: Fastening jigs, molds, or precision equipment (tight tolerances ensure repeatable performance).
- Food/Pharmaceutical Equipment: Corrosion resistance meets hygiene standards (no coating flaking or rust contamination).
Installation Tips for Precision & Safety
Proper installation maximizes the fastener’s performance:
- Use the Correct Tool: Employ a hex key (Allen wrench) that matches the socket size (to avoid stripping the drive).
- Pre-Drill Holes: Ensure holes are M16-sized (with a 14mm pilot hole for threading) to prevent cross-threading.
- Control Torque: Tighten to the recommended torque (≈120–150 N·m for M16 AISI 304 SHCS) to avoid over-tightening (which can damage threads) or under-tightening (which risks loosening).
- Inspect Regularly: For high-vibration applications, check fasteners periodically for loosening (re-tighten as needed).
How to Select the Right Socket Head Cap Screw
To choose the correct SHCS for your project:
- Match Size to Load: Select diameter/length based on the load (e.g., M16 for medium-to-heavy loads).
- Prioritize Material: Use AISI 304 for corrosion-prone environments; opt for higher-strength alloys (e.g., AISI 316) for extreme chemical exposure.
- Check Tolerances: For precision applications (e.g., tooling), confirm the fastener meets tight tolerance standards (±0.2mm length/±0.1mm diameter).
- Verify Compatibility: Ensure the thread spec (metric/imperial) matches existing components.
The AISI 304 M16×28 socket head cap screw delivers the precision, strength, and corrosion resistance needed for heavy-duty, high-performance applications. Its tight tolerances and durable material make it a cost-effective choice for projects that demand long-term reliability.
