High Strength Button Head Socket Cap Screws China Factory Suppliers
High Strength Button Head Socket Cap Screws China Factory Suppliers
Our premium Button Head Socket Cap Screws are engineered for high-performance industrial applications where a low-profile, aesthetically clean finish and superior strength are paramount. Featuring a radially curved bearing surface, these fasteners are specifically designed to reduce surface damage when applied to soft materials such as carbon fiber and aluminum, ensuring structural integrity without compromising the material's surface.
Manufactured to rigorous ISO 7380:2011 standards, these screws offer enhanced drive integrity with a deeper hex socket that prevents stripping even under high-torque conditions. Whether for aerospace turbine assemblies, automotive engine blocks, or precision medical devices, our Button Head screws provide the perfect balance of tensile strength, corrosion resistance, and precision engineering.
Detailed Parameters
| Standard | ISO 7380:2011 (DIN 7991 / GB/T 70.3 / ASME B18.3.5M) | Head Type | Button Head (Half-Round with Large Radius) |
|---|---|---|---|
| Strength Grade | Class 12.9 (10.9 / 8.8 available upon request) | Material | Alloy Steel (SCM435/40Cr), Oil-Quenched & Tempered |
| Hardness | 39-44 HRC / HV 435-530 (EN ISO 898-1) | Tensile Strength | ≥1,220 MPa (Tested per ISO 898-1) |
| Yield Strength | ≥1,100 MPa (Proof load at 0.0048d) | Thread Pitch | Standard Metric Coarse (Fine thread customizable) |
| Drive Type | Hex Socket (Allen Key) - ISO 10664 compliant | Drive Tolerance | ±0.03mm |
Key Advantages
Surface Protection
The radially curved bearing surface minimizes damage on soft substrates like aluminum and carbon fiber.
Corrosion Resistance
Available in Black Oxide (120h salt spray) and A4 Stainless Steel (500h+) for harsh environments.
Anti-Stripping Drive
Deeper hex sockets (≥1.5×shank diameter) ensure maximum torque transfer without stripping.
Stress Reduction
Transition radius ≥0.1d significantly reduces stress concentration compared to standard DIN specs.
Precision Fit
Strict head height tolerances of ±0.25mm ensure perfect alignment in tight assemblies.
Industry Compliance
Full compliance with ISO 10664 and ISO 13485 for medical and aerospace grade requirements.
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Global Export Expertise
20+ years of experience in international logistics and customs compliance for seamless delivery.
Custom Spec Support
Detailed product specification sheets provided upon request for informed engineering decisions.
Instant Quote Response
Rapid response system for pricing and customized solution proposals to keep your project on track.
Certified Documentation
Professionally prepared export papers and certifications ensuring hassle-free border clearance.
Visual Verification
Pre-shipment photo confirmation of branded and secure packaging for quality assurance.
Technical After-Sales
Swift resolution of all technical inquiries and product support by experienced engineers.
Investment Return Comparison
| Performance Metric | Standard Fasteners | Our Premium Button Head |
|---|---|---|
| Drive Life | Moderate (High Stripping Risk) | Extended (Deeper Socket Design) |
| Surface Impact | Potential Galling/Damage | Minimized (Curved Geometry) |
| Stress Fatigue | Standard Radius (Higher Stress) | Optimized Radius (Lower Stress) |
| Corrosion Life | Basic Plating | High (Up to 500h+ Salt Spray) |
| Installation Time | Standard | Reduced (Precision Fit/Tolerances) |
Frequently Asked Questions
ISO 7380 specifies a button head (half-round) which provides a lower profile and a larger bearing surface, whereas DIN 912 refers to a cylindrical head. Our version offers lower head height and enhanced drive depth compared to traditional standards.
Yes, our passivated stainless steel options meet ISO 13485 biocompatibility standards, making them suitable for high-precision medical device applications.
Grade 12.9 alloy steel provides an extremely high tensile strength of ≥1,220 MPa, allowing the fastener to withstand significant loads without deformation or failure.
It distributes the clamping force more evenly across the surface, which is critical when fastening to soft materials like carbon fiber or aluminum to prevent indentation and surface damage.
While we provide standard metric coarse threads, we offer full customization for fine threads to meet specific engineering requirements.
Our sockets are manufactured to ISO 10664 compliance with a strict tolerance of ±0.03mm, ensuring a precise fit with Allen keys and reducing the risk of tool slippage.
