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Carbon Steel Screw
This product is a Hexagon Socket Cylinder End Set Screw (alias: Headless Screw, Machine Screw, Locking Screw), a high-precision fastener designed for secure part fixation and anti-loosening. It complies with German Standard DIN915 and Chinese National Standard GB79, with non-standard customization available for specific requirements.
Crafted from Grade 4.8 high-quality carbon steel (carbon content: 0.15%-0.25%), it offers moderate strength (tensile strength ≥400MPa) and good toughness (elongation ≥22%), suitable for general industrial load-bearing applications. The surface is treated with blue-white zinc plating (plating thickness: 5-8μm), forming a dense anti-corrosion barrier to resist moisture and oxidation.
Product Description
This product is a Hexagon Socket Cylinder End Set Screw (alias: Headless Screw, Machine Screw, Locking Screw), a high-precision fastener designed for secure part fixation and anti-loosening. It complies with German Standard DIN915 and Chinese National Standard GB79, with non-standard customization available for specific requirements.
Crafted from Grade 4.8 high-quality carbon steel (carbon content: 0.15%-0.25%), it offers moderate strength (tensile strength ≥400MPa) and good toughness (elongation ≥22%), suitable for general industrial load-bearing applications. The surface is treated with blue-white zinc plating (plating thickness: 5-8μm), forming a dense anti-corrosion barrier to resist moisture and oxidation.
Manufactured via high-precision thread processing technology (using CNC lathes and thread rolling machines), the screw features regular thread profiles (60° thread angle) and small fit clearance (precision up to IT6-IT7 grade). The hexagon socket drive (compliant with ISO 4762) supports high-torque installation (max torque: 15N·m), while the cylinder end design (end face perpendicularity ≤0.05mm) enables flush mounting (no protrusions), preventing scratching of mating parts or affecting appearance.
Primarily used for part fixation in machinery, furniture, and industrial facilities, it ensures the stability of assembled structures and prevents loosening caused by vibration or impact.
Crafted from Grade 4.8 high-quality carbon steel (carbon content: 0.15%-0.25%), it offers moderate strength (tensile strength ≥400MPa) and good toughness (elongation ≥22%), suitable for general industrial load-bearing applications. The surface is treated with blue-white zinc plating (plating thickness: 5-8μm), forming a dense anti-corrosion barrier to resist moisture and oxidation.
Manufactured via high-precision thread processing technology (using CNC lathes and thread rolling machines), the screw features regular thread profiles (60° thread angle) and small fit clearance (precision up to IT6-IT7 grade). The hexagon socket drive (compliant with ISO 4762) supports high-torque installation (max torque: 15N·m), while the cylinder end design (end face perpendicularity ≤0.05mm) enables flush mounting (no protrusions), preventing scratching of mating parts or affecting appearance.
Primarily used for part fixation in machinery, furniture, and industrial facilities, it ensures the stability of assembled structures and prevents loosening caused by vibration or impact.
Product Parameter
Key Specifications (Complies with GB/T 79 (Chinese National Standard for Set Screws)):
| Nominal Thread Diameter (M) | Nominal Length (mm) | Thread Pitch (mm) | Example Specification |
| M6 | 20 | 3 | M6*20 (Pitch 3) |
| M8 | 25 | 4 | M8*25 (Pitch 4) |
Note: Non-standard customization is available (e.g., adjusting nominal thread diameter, length, thread pitch) to meet special assembly requirements. Minimum order quantity varies by specification (1000 pieces for Standard Specifications).
Product Feature
High-Precision Manufacturing: Uses advanced thread processing equipment (e.g., Swiss imported thread rolling machines) to achieve IT6-IT7 grade thread precision. Ensures tight fit with mating parts (e.g., nuts, bushings) and effectively prevents loosening, suitable for high-precision applications (e.g., precision machinery, instruments).
Premium Material & Surface Treatment: Grade 4.8 carbon steel offers moderate strength and good toughness, ideal for medium-load applications (e.g., furniture assembly, industrial building material connections). Blue-white zinc plating provides strong corrosion resistance (≥48 hours salt spray test without red rust), suitable for humid or mildly corrosive environments (e.g., food industry, ship parts).
Customization Service: The factory has complete non-standard customization capabilities, allowing adjustments to thread parameters (e.g., nominal diameter, pitch), length, and surface treatment (e.g., nickel plating, black oxide) to meet special assembly requirements (e.g., irregular part fixation, high-corrosion environments).
Wide Applicability: Covers multiple fields including home decoration, industrial building materials, medical equipment, food industry, vehicle & ship parts, and communication industry. It is highly adaptable and can replace imported(e.g., German DIN915 standard screws) with better cost-effectiveness.
Cost Efficiency: Grade 4.8 carbon steel raw material cost is about 1/3 of stainless steel, and blue-white zinc plating process is mature with high production efficiency. Thus, the product is more cost-competitive (e.g., M6*20 regular specification unit price: ~0.008 USD/piece).
Application Fields
Home Decoration: Used for furniture (e.g., sofas, wardrobes, bookshelves, bed frames) assembly to fix connectors (e.g., hinges, slides, shelf brackets). Flush mounting keeps furniture appearance tidy and avoids protrusions from scratching users.
Industrial Building Materials: Used for connections in steel structure buildings (e.g., factories, warehouses, bridges), scaffolding, and railway facilities. It bears heavy loads (e.g., steel beam splicing, equipment fixation) to ensure structural safety.
Medical Equipment: Used for part fixation in medical devices (e.g., operating tables, imaging equipment, rehabilitation devices, hospital beds). It meets the hygiene requirements of the medical industry (blue-white zinc plating contains no harmful substances) and has high precision to ensure stable device operation.
Food Industry: Used for assembly of food processing machinery (e.g., packaging machines, conveyor lines, mixers, sealing machines). It is corrosion-resistant (against acid-base erosion from food raw materials), easy to clean (smooth surface with no dead corners), and complies with food-grade hygiene standards (GB 14930.1-2016).
Vehicle & Ship Parts: Used for fixation of engine components (e.g., cylinder heads, camshafts), chassis parts (e.g., suspension brackets, drive shafts), and interior parts (e.g., dashboards, seats) in automobiles/ships. It withstands vibration and impact to ensure operating stability.
Communication Industry: Used for internal part fixation in communication equipment (e.g., base stations, switches, routers, fiber optic terminals). Flush mounting does not affect device appearance, and corrosion resistance (against humid environments in machine rooms) ensures stable signal transmission.
Premium Material & Surface Treatment: Grade 4.8 carbon steel offers moderate strength and good toughness, ideal for medium-load applications (e.g., furniture assembly, industrial building material connections). Blue-white zinc plating provides strong corrosion resistance (≥48 hours salt spray test without red rust), suitable for humid or mildly corrosive environments (e.g., food industry, ship parts).
Customization Service: The factory has complete non-standard customization capabilities, allowing adjustments to thread parameters (e.g., nominal diameter, pitch), length, and surface treatment (e.g., nickel plating, black oxide) to meet special assembly requirements (e.g., irregular part fixation, high-corrosion environments).
Wide Applicability: Covers multiple fields including home decoration, industrial building materials, medical equipment, food industry, vehicle & ship parts, and communication industry. It is highly adaptable and can replace imported(e.g., German DIN915 standard screws) with better cost-effectiveness.
Cost Efficiency: Grade 4.8 carbon steel raw material cost is about 1/3 of stainless steel, and blue-white zinc plating process is mature with high production efficiency. Thus, the product is more cost-competitive (e.g., M6*20 regular specification unit price: ~0.008 USD/piece).
Application Fields
Home Decoration: Used for furniture (e.g., sofas, wardrobes, bookshelves, bed frames) assembly to fix connectors (e.g., hinges, slides, shelf brackets). Flush mounting keeps furniture appearance tidy and avoids protrusions from scratching users.
Industrial Building Materials: Used for connections in steel structure buildings (e.g., factories, warehouses, bridges), scaffolding, and railway facilities. It bears heavy loads (e.g., steel beam splicing, equipment fixation) to ensure structural safety.
Medical Equipment: Used for part fixation in medical devices (e.g., operating tables, imaging equipment, rehabilitation devices, hospital beds). It meets the hygiene requirements of the medical industry (blue-white zinc plating contains no harmful substances) and has high precision to ensure stable device operation.
Food Industry: Used for assembly of food processing machinery (e.g., packaging machines, conveyor lines, mixers, sealing machines). It is corrosion-resistant (against acid-base erosion from food raw materials), easy to clean (smooth surface with no dead corners), and complies with food-grade hygiene standards (GB 14930.1-2016).
Vehicle & Ship Parts: Used for fixation of engine components (e.g., cylinder heads, camshafts), chassis parts (e.g., suspension brackets, drive shafts), and interior parts (e.g., dashboards, seats) in automobiles/ships. It withstands vibration and impact to ensure operating stability.
Communication Industry: Used for internal part fixation in communication equipment (e.g., base stations, switches, routers, fiber optic terminals). Flush mounting does not affect device appearance, and corrosion resistance (against humid environments in machine rooms) ensures stable signal transmission.
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