Socket Screws

UNF Socket Cap Head Screws are made of zinc-plated steel, offering superior corrosion resistance and excellent strength to weight ratio. Fully threaded and supplied with a plain finish, these long-lasting screws are the ideal choice for a variety of projects and applications.

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Silicon bronze is like most other bronzes in that it is a copper alloy – that is, the base alloying metal is pure copper, imbued with other elements. It is made using around 94-96% copper by weight, and the rest is typically 2.5-6% silicon and a mixture of other metals such as aluminium, zinc, lead, iron, manganese, and more.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard DIN 912 Screw Thread Pitch 1.5mm Thread M10 (10mm), Right Hand Thread Socket / Allen Key Size (J) 8mm Head Diameter [Max] (D) 16mm Head Diameter (D) Tolerance +0/-0.36mm Head Length [Max] (H) 10mm Head Length (H) Tolerance +0/-0.36mm Hexagon Depth (P) 5mm    See a problem with this specification? Let us know.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard DIN 7991 Screw Thread Pitch 1.5mm Thread M10 (10mm), Right Hand Thread Countersunk Angle (CA) 90 Degrees Head Length [Max] (H) 6.2mm Head Diameter [Max] (D) 22.4mm Head Diameter [Min] (D) 19.22mm Hexagon Across Flats / Allen Key Size (J) 6mm Hexagon Depth (P) 3.6mm   See a problem with this specification? Let us know.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard ISO 7380 Screw Thread Pitch 1.5mm Thread M10 (10mm), Right Hand Thread Hexagon Width Across Flats / Allen Key Size (J) 6mm Maximum Head Diameter (D) 17.5mm Maximum Head Length (H) 5.5mm Minimum Hexagon Socket Depth (P) 3.12mm  

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Material High Tensile Steel (12.9) Finish Self Colour Manufacturing Standard DIN 912 Screw Thread Pitch 0.4mm Thread M2 (2mm), Right Hand Thread Socket / Allen Key Size (J) 1.5mm Head Diameter [Max] (D) 3.8mm Head Diameter (D) Tolerance +0/-0.18mm Head Length [Max] (H) 2mm Head Length (H) Tolerance +0/-0.14mm Hexagon Depth (P) 1mm    See a problem with this specification? Let us know.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard DIN 912 Screw Thread Pitch 0.4mm Thread M2 (2mm), Right Hand Thread Socket / Allen Key Size (J) 1.5mm Head Diameter [Max] (D) 3.8mm Head Diameter (D) Tolerance +0/-0.18mm Head Length [Max] (H) 2mm Head Length (H) Tolerance +0/-0.14mm Hexagon Depth (P) 1mm    See a problem with this specification? Let us know.

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Material High Tensile Steel (12.9) Finish Self Colour Manufacturing Standard DIN 912 Screw Thread Pitch 0.45mm Thread M2.5 (2.5mm), Right Hand Thread Socket / Allen Key Size (J) 2mm Head Diameter [Max] (D) 4.5mm Head Diameter (D) Tolerance +0/-0.18mm Head Length [Max] (H) 2.5mm Head Length (H) Tolerance +0/-0.14mm Hexagon Depth (P) 1.1mm    See a problem with this specification? Let us know.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard DIN 912 Screw Thread Pitch 0.45mm Thread M2.5 (2.5mm), Right Hand Thread Socket / Allen Key Size (J) 2mm Head Diameter [Max] (D) 4.5mm Head Diameter (D) Tolerance +0/-0.18mm Head Length [Max] (H) 2.5mm Head Length (H) Tolerance +0/-0.14mm Hexagon Depth (P) 1.1mm    See a problem with this specification? Let us know.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Hexagon Width Across Flats / Allen Key Size (J) 2mm Maximum Head Diameter (D) 5.7mm Maximum Head Length (H) 1.65mm Minimum Hexagon Socket Depth (P) 1.04mm   See a problem with this specification? Let us know.

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Material High Tensile Steel (10.9) Finish Zinc Plated Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Hexagon Width Across Flats / Allen Key Size (J) 2mm Maximum Head Diameter (D) 5.7mm Maximum Head Length (H) 1.65mm Minimum Hexagon Socket Depth (P) 1.04mm   See a problem with this specification? Let us know.

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Material High Tensile Steel (12.9) Finish Self Colour Manufacturing Standard DIN 912 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Socket / Allen Key Size (J) 2.5mm Head Diameter [Max] (D) 5.5mm Head Diameter (D) Tolerance +0/-0.18mm Head Length [Max] (H) 3mm Head Length (H) Tolerance +0/-0.14mm Hexagon Depth (P) 1.3mm    See a problem with this specification? Let us know.

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Material Stainless Steel (A2) Finish Natural Manufacturing Standard DIN 912 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Socket / Allen Key Size (J) 2.5mm Head Diameter [Max] (D) 5.5mm Head Diameter (D) Tolerance +0/-0.18mm Head Length [Max] (H) 3mm Head Length (H) Tolerance +0/-0.14mm Hexagon Depth (P) 1.3mm    See a problem with this specification? Let us know.

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M3 Socket Countersunk Screws (DIN 7991) in self-colour high tensile steel (10.9) are specific types of screws with particular characteristics: M3: This refers to the metric thread size of the screw. M3 indicates that the diameter of the screw is 3 millimeters. Socket: These screws have a socket (hexagonal) drive, which means you'll need a hex key or Allen wrench to install or remove them. The socket drive design provides a more secure and efficient way to apply torque compared to other drive types like slotted or Phillips. Countersunk: Countersunk screws have a conical head with a flat top. They are designed to sit flush with the surface when installed, giving a neat and smooth finish. DIN 7991: This refers to the standard or specification that the screw follows. DIN 7991 is a standard that specifies the dimensions, tolerances, and other requirements for socket countersunk screws. Self Colour: "Self-colour" means that the screws have not undergone any surface finishing treatment like plating or coating. They are made of plain steel and may be susceptible to corrosion, so they are often used in applications where appearance is not a concern, and other corrosion protection methods are employed. High Tensile Steel (10.9): This indicates the strength and material grade of the screws. "High tensile" means that the steel used is strong and can withstand a significant amount of tensile (pulling) force. The "10.9" is a classification that specifies the hardness and strength of the steel. In this case, 10.9 indicates a tensile strength of 1000 N/mm² and a minimum yield strength of 900 N/mm². Material High Tensile Steel (10.9) Finish Self Colour Manufacturing Standard DIN 7991 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Countersunk Angle (CA) 90 Degrees Head Length [Max] (H) 1.86mm Head Diameter [Max] (D) 6.72mm Head Diameter [Min] (D) 5.54mm Hexagon Across Flats / Allen Key Size (J) 2mm Hexagon Depth (P) 1.1mm   For larger quantities or sizes not listed, please email frank@franksfasteners.co.uk and we will be happy to provide you with a quotation.

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M3 Socket Countersunk Screws (DIN 7991) in Stainless Steel (A2) are another type of screws with specific characteristics: M3: This is the metric thread size of the screw, indicating a 3-millimeter diameter. Socket: These screws feature a socket (hexagonal) drive, requiring a hex key or Allen wrench for installation and removal. The socket drive design provides a secure and efficient way to apply torque. Countersunk: Countersunk screws have a conical head with a flat top, allowing them to sit flush with the surface when installed, providing a clean and smooth finish. DIN 7991: This refers to the DIN specification that the screws conform to. DIN 7991 specifies the dimensions, tolerances, and other requirements for socket countersunk screws. Stainless Steel (A2): Stainless steel is a corrosion-resistant material, and A2 is a specific grade or alloy within the stainless steel family. In this context: Stainless Steel: Stainless steel is highly resistant to corrosion, making it suitable for a wide range of applications, including those exposed to moisture, humidity, or chemicals. A2: A2 stainless steel, also known as AISI 304, is a popular stainless steel grade. It is known for its excellent corrosion resistance, making it suitable for general-purpose applications. It contains about 18% chromium and 8% nickel, which contribute to its corrosion resistance properties. Material Stainless Steel (A2) Finish Natural Manufacturing Standard DIN 7991 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Countersunk Angle (CA) 90 Degrees Head Length [Max] (H) 1.86mm Head Diameter [Max] (D) 6.72mm Head Diameter [Min] (D) 5.54mm Hexagon Across Flats / Allen Key Size (J) 2mm Hexagon Depth (P) 1.1mm   For larger quantities or sizes not listed, please email frank@franksfasteners.co.uk and we will be happy to provide you with a quotation.

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Material High Tensile Steel (10.9) Finish Self Colour Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand  Length (L) 10mm Allen Key Size (S) 2mm Maximum Head Diameter (DK) 5.7mm Maximum Head Depth (K) 1.65mm   High-strength fasteners are designed for use in applications requiring reliable performance under heavy loads. These screws feature a rounded button head with a hexagonal socket drive, allowing for easy installation and removal with an Allen key.  Made from self-colour high tensile steel with a 10.9 grade, they offer superior strength and durability. Ideal for engineering, machinery, and automotive applications where strong and secure fastening is required. The self-colour finish provides a raw steel look, without additional coatings.

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Material Stainless Steel (A2) Finish CB10 Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Hexagon Width Across Flats / Allen Key Size (J) 2mm Maximum Head Diameter (D) 5.7mm Maximum Head Length (H) 1.65mm Minimum Hexagon Socket Depth (P) 1.04mm  

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Material High Tensile Steel (10.9) Finish Self Colour Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand  Length (L) 14mm Allen Key Size (S) 2mm Maximum Head Diameter (DK) 5.7mm Maximum Head Depth (K) 1.65mm   High-strength fasteners are designed for use in applications requiring reliable performance under heavy loads. These screws feature a rounded button head with a hexagonal socket drive, allowing for easy installation and removal with an Allen key.  Made from self-colour high tensile steel with a 10.9 grade, they offer superior strength and durability. Ideal for engineering, machinery, and automotive applications where strong and secure fastening is required. The self-colour finish provides a raw steel look, without additional coatings.

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Material High Tensile Steel (10.9) Finish Self Colour Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand  Length (L) 20mm Allen Key Size (S) 2mm Maximum Head Diameter (DK) 5.7mm Maximum Head Depth (K) 1.65mm   High-strength fasteners are designed for use in applications requiring reliable performance under heavy loads. These screws feature a rounded button head with a hexagonal socket drive, allowing for easy installation and removal with an Allen key.  Made from self-colour high tensile steel with a 10.9 grade, they offer superior strength and durability. Ideal for engineering, machinery, and automotive applications where strong and secure fastening is required. The self-colour finish provides a raw steel look, without additional coatings.

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Material Stainless Steel (A2) Finish CB10 Manufacturing Standard ISO 7380 Screw Thread Pitch 0.5mm Thread M3 (3mm), Right Hand Thread Hexagon Width Across Flats / Allen Key Size (J) 2mm Maximum Head Diameter (D) 5.7mm Maximum Head Length (H) 1.65mm Minimum Hexagon Socket Depth (P) 1.04mm  

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