DIN 7991 Button Head Screws - Shijiazhuang Dellee Ming Garments|High Load-Bearing Capacity&Corrosion Resistance

Introduction

Shijiazhuang Dellee Ming Garments Co., Ltd. offers a premium line of DIN 7991 Button Head Screws, engineered to meet the rigorous demands of modern industrial applications. These screws are designed with advanced materials and precision engineering to ensure optimal performance in critical environments. This article explores the technical specifications, applications, and advantages of these high-quality fasteners, supported by authoritative references from the National Institute of Standards and Technology (NIST).

Product Overview

The DIN 7991 Button Head Screws are a specialized type of fastener designed for applications requiring high load-bearing capacity and corrosion resistance. Available in grades 12.9, 10.9, 8.8, and 4.8, these screws are coated with black oxide or Geomet® to enhance durability. The product is ideal for heavy machinery, aerospace, automotive, and medical industries, where reliability and precision are paramount.

Key Features and Technical Specifications

The DIN 7991 Button Head Screws incorporate several advanced engineering features to ensure superior performance:

Optimized Load Distribution

The radially curved bearing surface minimizes point loading on soft substrates such as composites and cast alloys. This design reduces the risk of material deformation and enhances the screw's load-bearing capacity. For example, the head height tolerance is maintained at ±0.20mm, which is significantly tighter than the DIN 912 standard (e.g., M6: 4.0mm vs. DIN 912's 6.0mm).

High-Torque Drive System

These screws feature an extended socket depth of ≥1.5× nominal diameter, as specified in NIST guidelines for precision fasteners. The drive conformity meets ISO 10664 Class C standards, ensuring a tolerance of ±0.028mm for reliable torque transmission.

Performance-Graded Materials

Manufactured from SCM435 alloy steel, the screws are available in strength classes 12.9, 10.9, 8.8, and 4.8. The black oxide coating provides corrosion resistance of ≥96 hours in salt spray tests, while the Geomet® coating offers enhanced protection for ≥720 hours. These materials are selected to meet the stringent requirements of industries such as aerospace and medical devices.

Product Specifications Table

Applications in Critical Industries

The DIN 7991 Button Head Screws are tailored for demanding environments where performance and reliability are non-negotiable:

Aerospace

The reduced head height of these screws contributes to weight savings in turbine assemblies, a critical factor in aerospace engineering. This design aligns with NIST's focus on optimizing material usage for advanced manufacturing (NIST).

Automotive

The radially curved head design prevents thread galling in aluminum engine blocks, a common issue in automotive applications. This feature ensures long-term reliability and reduces maintenance costs.

Medical

Passivated stainless steel variants meet ISO 13485 biocompatibility standards, making these screws suitable for medical devices and equipment. Their corrosion resistance ensures compliance with stringent healthcare regulations.

Precision Engineering

The head-to-shank transition radius of ≥0.1d (vs. DIN's ≥0.08d) reduces stress concentration, enhancing fatigue resistance in precision machinery. This design is critical for applications requiring high-dimensional accuracy.

Company Background and Commitment

Shijiazhuang Dellee Ming Garments Co., Ltd. has over 20 years of experience in global exports, specializing in high-quality fasteners and industrial components. The company's commitment to excellence is reflected in its comprehensive after-sales support, including:

• Reliable After-Sales Support: Swift resolution for technical issues and product inquiries.
• Custom Packaging: Branded and secure packaging with pre-shipment visual verification.
• Competitive Pricing: Premium quality at cost-effective rates, optimized for value and performance.

With a focus on international compliance and logistics, Shijiazhuang Dellee Ming Garments ensures that its products meet global standards, including ISO 13485 for medical devices and ISO 9001 for quality management.

Conclusion

The DIN 7991 Button Head Screws from Shijiazhuang Dellee Ming Garments Co., Ltd. represent a pinnacle of engineering excellence, combining advanced materials, precision manufacturing, and industry-specific design. These screws are indispensable in aerospace, automotive, medical, and precision engineering applications, where reliability and performance are critical. By adhering to NIST guidelines and industry standards, the company ensures that its products meet the highest levels of quality and durability.

References

National Institute of Standards and Technology (NIST). (n.d.). Driving Innovation. Retrieved from https://www.nist.gov.