socket head cap screw dimensions metric pdf
socket head cap screw dimensions metric pdf
Socket head cap screws are versatile fasteners with a hexagon socket drive, offering high torque transmission and compact design. They are ideal for applications requiring strong, flush mounting solutions in machinery, automotive, and construction industries. Available in metric sizes from M1.6 to M48, these screws are made from materials like alloy steel or stainless steel, ensuring durability and resistance to corrosion. Their dimensions and properties are standardized under specifications like DIN 912 and ISO 4762, making them a reliable choice for precision engineering and assembly.
Metric Dimensions Overview
Metric dimensions for socket head cap screws are standardized under DIN 912 and ISO 4762, covering sizes from M1.6 to M48 with coarse and fine threads. Body diameter varies with screw size, while head diameter and socket size are precisely specified. Torque values increase with screw diameter, ensuring compatibility and performance across industries. These standards ensure consistent quality and reliability for applications requiring precise fastening solutions.
Standard Specifications
Socket head cap screws comply with DIN 912 and ISO 4762 standards, defining mechanical properties, dimensions, and material requirements. These specifications ensure consistency and reliability in metric sizes.
3.1 DIN 912 Standards
DIN 912 standards provide detailed specifications for metric socket head cap screws, covering dimensions, tolerances, and material properties. These standards ensure screws meet precise requirements for size, strength, and finish, guaranteeing compatibility and reliability across applications. Compliance with DIN 912 is crucial for consistency in manufacturing and quality assurance, making these screws a trusted choice in industrial and engineering contexts. The standards also address the screw’s mechanical performance, ensuring they meet stringent load-bearing and torque requirements.
3.2 ISO 4762 Compliance
ISO 4762 compliance ensures socket head cap screws meet international standards for mechanical properties, dimensions, and material quality. This standard specifies requirements for hexagon socket head cap screws, including tensile strength, yield stress, and thread accuracy. Compliance guarantees screws are suitable for high-strength applications, offering reliability and consistency. Manufacturers adhering to ISO 4762 provide products with verified performance, making them a preferred choice for critical engineering and industrial applications globally.
Material Properties
Socket head cap screws are typically made from high-strength alloy steel or stainless steel, offering excellent tensile strength, durability, and resistance to corrosion. Alloy steel provides superior mechanical properties, while stainless steel ensures longevity in harsh environments, making them ideal for demanding applications.
4.1 Alloy Steel
Alloy steel socket head cap screws offer high tensile strength and durability, making them ideal for demanding applications. Heat-treated to enhance mechanical properties, they achieve class 12.9 ratings, ensuring superior resistance to wear and fatigue. These screws are widely used in machinery, automotive, and construction industries where strength and reliability are critical. Their robust composition makes them suitable for high-load environments while maintaining dimensional stability and corrosion resistance.
4.2 Stainless Steel
Stainless steel socket head cap screws provide excellent corrosion resistance, ideal for harsh environments. Made from grades like A2 (304) and A4 (316), they withstand moisture, chemicals, and extreme temperatures. Their polished finishes enhance durability and aesthetics. Commonly used in marine, food processing, and medical equipment, these screws maintain strength while resisting rust, ensuring long-term reliability. They are a preferred choice for applications requiring both durability and corrosion protection.
Screw Diameter and Thread Pitch
Socket head cap screws are available in metric diameters from M1.6 to M48, with both coarse and fine thread pitches. The thread pitch varies with diameter, ensuring compatibility and proper fit in applications. Standard specifications like DIN 912 and ISO 4762 define these dimensions, ensuring consistency across manufacturers and applications.
5.1 Body Diameter
The body diameter of metric socket head cap screws ranges from M1.6 to M48, adhering to standards like DIN 912. This dimension is critical for load-bearing capacity and must match the intended application. The diameter is precisely tolerance-controlled to ensure compatibility with threaded holes; Materials like alloy steel and stainless steel further enhance strength. The body diameter is always slightly smaller than the head diameter, ensuring a flush fit in assemblies. Proper sizing is essential for optimal performance and safety.
5.2 Head Diameter
The head diameter of metric socket head cap screws is slightly larger than the body diameter, ensuring a secure fit. It ranges from M3 to M42, with specific tolerances defined by ISO 4762. The hexagon socket within the head allows precise torque application. This design optimizes strength and minimizes the risk of stripping. The head’s compact size makes it ideal for tight spaces, enhancing versatility across various industrial applications while maintaining structural integrity and reliability.
5.3 Thread Length
Thread length for metric socket head cap screws is measured parallel to the screw’s axis, from the tip to the last complete thread. It varies depending on the screw’s nominal size and application. For screws up to M24, the thread length is typically shorter, while larger sizes have longer threads for enhanced grip. Proper thread length ensures optimal engagement and load distribution, critical for maintaining structural integrity in demanding applications.
Head and Socket Dimensions
Head and socket dimensions for metric socket head cap screws are standardized, ensuring precise alignment and torque transmission. The head diameter and socket size vary with screw size, adhering to ISO 4762 specifications for consistency and reliability in various applications.
6.1 Head Height
The head height of metric socket head cap screws varies by size, ranging from 3mm for M3 screws to 54mm for M36 screws. This dimension ensures proper seating and alignment, with specific tolerances defined by ISO 4762. The head height is critical for flush mounting and maintaining structural integrity, making it a key factor in design and application suitability across industries.
6.2 Socket Size
Socket size increases proportionally with screw diameter, ensuring optimal torque transmission. For metric screws, socket sizes range from 3mm for M3 to 54mm for M36. The socket’s internal dimensions are critical for tool engagement, with standards like ISO 4762 defining precise measurements. Proper socket size ensures secure fastening and prevents tool slippage, making it essential for reliable assembly across various industrial applications.
Torque and Tensile Strength
Socket head cap screws in Property Class 12.9 offer high tensile strength and torque values calculated to induce 420 MPa stress in the threads for secure fastening.
7.1 Tightening Torque Values
Tightening torque values for socket head cap screws are calculated to induce 420 MPa stress in the threads, ensuring secure fastening without over-tightening. Class 12.9 screws, made from high-strength alloy steel, provide maximum torque capacity. Torque values vary by screw size, with larger diameters requiring higher torque for optimal clamping force. These values are specified for plain screws, ensuring reliability across various applications. Torque charts are available for precise guidance.
7.2 Tensile Stress and Yield Stress
Tensile stress and yield stress are critical mechanical properties for socket head cap screws. Class 12.9 screws exhibit a tensile stress of 1300 MPa and a yield stress of 1170 MPa up to M16, reducing to 1250 MPa and 1125 MPa for larger sizes. These values ensure high strength and resistance to deformation under load, making them suitable for demanding applications requiring reliable structural integrity and performance.
Applications and Usage
Socket head cap screws are widely used in machinery, automotive, and construction for their versatility and high strength. They are ideal for applications requiring flush mounting and high torque transmission, such as machine repair, assembly, and heavy-duty equipment. Their compact design makes them suitable for confined spaces, while their corrosion-resistant options ensure reliability in harsh environments.
8.1 General Applications
Socket head cap screws are highly versatile and used in various applications requiring strong, flush mounting solutions. They are ideal for machinery, automotive, and construction industries due to their high strength and compact design. These screws are commonly used in machine repair, assembly, and heavy-duty equipment. Their ability to handle high torque makes them suitable for applications where reliability and durability are critical. They are also used in confined spaces where traditional fasteners may not fit, ensuring efficient and secure fastening solutions.
8.2 Industries and Use Cases
Socket head cap screws are widely utilized in aerospace, automotive, and industrial machinery sectors due to their high tensile strength and resistance to corrosion. They are essential in applications where high torque and flush mounting are critical, such as in engine components, heavy machinery, and precision equipment. Additionally, they are used in construction for assembling metal structures and in electronics for securing components in tight spaces, ensuring reliability and durability across diverse industries.
Coatings and Finishes
Socket head cap screws are available in various coatings, including zinc plating for corrosion resistance and stainless steel finishes for enhanced durability in harsh environments. These finishes ensure longevity and protection against rust, making them suitable for both indoor and outdoor applications.
9.1 Zinc Plating
Zinc plating is a common finish for socket head cap screws, offering excellent corrosion resistance. It involves electroplating a thin layer of zinc onto the screw surface, creating a protective barrier against rust and wear. This finish is particularly effective in outdoor and high-moisture environments, ensuring durability without compromising the screw’s mechanical properties. Zinc-plated screws are widely used in construction, automotive, and general engineering applications.
9.2 Stainless Steel Finishes
Stainless steel finishes for socket head cap screws provide exceptional corrosion resistance and durability. Grades like A2 (304) and A4 (316) are commonly used, offering superior performance in harsh environments. The natural self-colour finish is non-plated, maintaining the material’s inherent properties. These screws are ideal for marine, food processing, and medical applications where rust resistance and cleanliness are critical. Their polished surfaces also enhance visual appeal in precision engineering projects.
Comparison with Other Screw Types
Socket head cap screws differ from hex and button head types by their unique hexagon socket drive, offering better torque control and flush mounting capabilities in compact spaces.
10.1 Hex Head Cap Screws
Hex head cap screws feature a larger, hexagonal head compared to socket head cap screws, providing higher torque capabilities and easier visibility. They are commonly used in heavy-duty applications where socket heads might not offer sufficient grip. While socket heads excel in flush mounting, hex heads are preferred for outdoor and rough-handling environments due to their robust design and resistance to wear. Typically made from alloy steel, hex head cap screws are available in sizes ranging from M5 to M20, making them suitable for construction and machinery assembly where strength and durability are critical. Their design makes them easier to drive with wrenches, offering a practical solution for applications requiring high torque without the need for specialized tools.
10.2 Button Head Cap Screws
Button head cap screws offer a low-profile design with a rounded head, making them ideal for applications where aesthetics and minimal protrusion are important. Unlike socket head screws, button heads have a smaller head diameter and are often used in lightweight applications. They are commonly found in electronics, furniture, and appliances where flush mounting is desired. Available in metric sizes from M3 to M12, they provide a balance between strength and visual appeal. Their design minimizes obstruction, making them suitable for surfaces where clearance is limited. However, they may require specialized tools for installation, which can add to the overall cost compared to socket head screws.
Common Sizes and Availability
Metric socket head cap screws are available in sizes from M1.6 to M48, with coarse and fine threads. They are stocked in steel and stainless steel grades, ensuring wide availability for various applications.
11.1 Diameter Range (M1.6 to M48)
Metric socket head cap screws are available in diameters ranging from M1.6 to M48, offering flexibility for diverse applications. Smaller diameters (M1.6 to M5) are ideal for precision machinery, while larger diameters (M6 to M48) suit heavy-duty construction and automotive industries. This extensive range ensures compatibility with various threaded components, making them a versatile choice for engineers and manufacturers. Standardization under DIN 912 and ISO 4762 guarantees consistent quality and reliability across all sizes.
11.2 Thread Types (Coarse and Fine)
Metric socket head cap screws are available with coarse or fine threads, each suited for specific applications. Coarse threads (e.g., M6 x 1.0) offer quicker assembly and higher strength, ideal for general engineering. Fine threads (e.g., M6 x 0.75) provide better resistance to vibration and are preferred for thin materials or precise fitments. Both thread types comply with standards like ISO 261 and ANSI B1.13M, ensuring compatibility and reliability across applications.
Measurement and Inspection
Measurement and inspection ensure socket head cap screws meet dimensional tolerances. Standards like ISO 4762 specify thread pitch, body, and head dimensions. Precision gauges verify compliance, ensuring quality control and reliability in final products.
12.1 Dimensional Tolerances
Dimensional tolerances for socket head cap screws are precisely defined to ensure proper fit and function. Standards like ISO 4762 specify acceptable ranges for body diameter, head diameter, and thread pitch. These tolerances are critical to maintaining interchangeability and reliability in assembled components. They also ensure that screws meet engineering requirements for strength and performance, making them suitable for precise mechanical applications across various industries.
12.2 Gaging and Inspection Methods
Gaging and inspection ensure socket head cap screws meet dimensional and mechanical requirements. Go-no-go gauges are used to check body and head diameters, while thread plug gauges verify pitch accuracy. Visual inspections assess head shape and socket size. Additional tests include hardness testing and torque evaluations to confirm strength and durability. These methods ensure compliance with standards like ISO 4762 and DIN 912, guaranteeing reliable performance in critical applications.
Screw Selection Guide
Socket head cap screws are chosen based on load, strength, and environmental conditions. Material compatibility and compliance with ISO 4762 ensure reliability and durability in various applications.
13.1 Load and Strength Requirements
Socket head cap screws must meet specific load and strength criteria, ensuring they withstand applied forces without failure. Tensile strength ranges from 900 to 1300 MPa, depending on material grades like 12.9. Yield stress is typically 80-90% of tensile strength. Torque values are calculated to avoid exceeding material limits, with Class 12.9 screws offering the highest strength. Proper material selection, like alloy steel or stainless steel, ensures compatibility with load demands and environmental conditions, preventing premature failure and ensuring long-term reliability.
13.2 Environmental and Corrosion Factors
Environmental conditions significantly influence screw selection. Stainless steel screws, such as A2 or A4 grades, are resistant to corrosion in wet or chemical environments. Zinc-plated screws offer moderate corrosion resistance, suitable for outdoor use. Coatings like black oxide enhance wear resistance. For extreme conditions, specialized finishes or materials may be required. Assessing environmental factors ensures optimal screw performance and longevity, preventing premature degradation and maintaining structural integrity in harsh settings.
Downloadable PDF Resources
Downloadable PDF resources provide detailed technical specifications, dimensional charts, and material properties for metric socket head cap screws, ensuring precise engineering and procurement decisions.
14.1 Dimensional Charts
Metric socket head cap screw dimensional charts provide precise measurements for body diameter, head diameter, thread length, and socket size. These charts, typically in millimeters, cover sizes from M1.6 to M48, including coarse and fine thread options. Engineers and manufacturers rely on these charts to ensure compatibility and accuracy in design and assembly. They often include torque values and tensile strength data, essential for selecting the right screw for specific applications.
14.2 Technical Data Sheets
Technical data sheets for metric socket head cap screws provide detailed specifications, including material properties, tensile strength, and torque values. They outline standards like DIN 912 and ISO 4762, ensuring compliance with international quality benchmarks. These sheets also cover finishes such as zinc plating and stainless steel options, offering insights into corrosion resistance and environmental suitability. Engineers use this data to optimize screw selection for specific applications, ensuring reliability and performance in critical assemblies.