Button Head Socket Cap Screw

The ISO 7380 Button Head Screw (Equivalent to DIN 7991) is a specialized low-profile fastener distinguished by its semi-spherical head with internal hex drive. Engineered for space-constrained and high-shear applications, it delivers robust clamping force with minimal head height (30-40% lower than standard cap screws).

DESCRIPTION

PRODUCT Tags

Optimized Head Geometry

Radially curved bearing surface reduces surface damage on soft materials (e.g., carbon fiber, aluminum）

Head height tolerance: ±0.25mm (e.g., M6 head height: 4.0mm vs. DIN 912’s 6.0mm)

Enhanced Drive Integrity

Deeper hex socket (≥1.5×shank diameter vs. DIN 912’s ≥0.8d) prevents stripping at high torque

Drive size compliance: ISO 10664 (tolerance ±0.03mm)

Performance-Tailored Materials

Grade 12.9 alloy steel (≥1,220 MPa tensile strength)

Corrosion options: Black oxide (120h salt spray), A4 stainless steel (500h+)

Parameter	Technical Data
Standard	ISO 7380:2011 (Equivalent to DIN 7991, GB/T 70.3, ASME B18.3.5M)
Head Type	Button Head (Half-Round Head with Large Radius)
Strength Grade	Class 12.9 (Options: 10.9 / 8.8 available upon request)
Material	Alloy Steel (SCM435/40Cr), Oil-Quenched & Tempered
Hardness	39-44 HRC / HV 435-530 (Controlled per 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 Thread (Fine thread customizable)
Drive Type	Hex Socket (Allen Key) - ISO 10664 compliant (Size tolerance: ±0.03mm)

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Key Applications

Technical Superiority in Critical Applications

Aerospace: Reduced head height saves weight in turbine assemblies

Automotive: Curved head prevents thread galling in aluminum engine blocks

Medical: Passivated stainless steel meets ISO 13485 biocompatibility

Precision Engineering: Head-to-shank transition radius ≥0.1d (vs. DIN’s ≥0.08d) reduces stress concentration

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SERIVCE

Reliable After-Sales Support:Swift resolution for all technical issues & product inquiries. / 20+ Years of Global Export Expertise:Proven experience in international logistics & compliance.

Detailed Product Specifications On Request:Customizable spec sheets for informed purchasing decisions. / Instant Quote Response:Submit inquiries for prompt pricing & solution proposals.

Certified Export Documentation & Timely Shipment:Hassle-free logistics with professionally prepared export papers.

Custom Packaging with Pre-Shipment Visual Verification:Branded/secure packaging with photo confirmation before dispatch.

Premium Quality at Competitive Pricing: Industry-leading products optimized for value & performance.

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Button Head Socket Cap Screw – Sleek Design with Strong Fastening Performance

Button head socket cap screws combine a low-profile, rounded head with the convenience of an internal hex drive, providing a smooth, attractive finish without sacrificing strength. Ideal for applications where aesthetics and reliable fastening are both critical, these screws are commonly used in electronics, automotive, and furniture industries.

Button Head Socket Cap Screw: Combining Elegance and Strength in Fastening Solutions

Smooth and Low-Profile Button Head Design

The rounded button head offers a sleek, smooth surface that reduces snagging and adds a refined look to assemblies. This makes these screws perfect for visible applications where appearance matters, such as consumer electronics and decorative hardware.

Secure Drive with Internal Hex Socket

Equipped with an internal hex drive, button head socket cap screws allow for precise torque control and easy installation using Allen wrenches. This ensures strong, reliable fastening while minimizing the risk of stripping.

Durable Materials and Finishes for Longevity

Typically made from stainless steel, alloy steel, or with protective coatings, these screws resist corrosion and wear, providing long-term durability even in demanding environments such as automotive or outdoor equipment.

Wide Range of Sizes and Thread Types

Available in multiple diameters, lengths, and thread pitches, button head socket cap screws can be selected to suit various project requirements, from lightweight electronics to heavy machinery, offering versatility without compromising on performance.