Description and Translation of ISO 4161 Fasteners
ISO 4161 fasteners, an international standard for mechanical components, serve as essential connecting elements widely used in general machinery, automotive assemblies, and industrial equipment. Their primary function is to create reliable detachable joints capable of transmitting static and moderate dynamic loads, ensuring structural stability and operational safety across diverse applications. These fasteners facilitate standardized assembly processes while enabling efficient maintenance and component replacement.
In terms of materials, ISO 4161 fasteners are predominantly manufactured from carbon steel (e.g., property class 8.8 per ISO 898-1) and alloy steel, providing excellent tensile strength and mechanical durability. For corrosion-resistant requirements, stainless steel variants (e.g., A2-70, A4-80 conforming to ISO 3506) are specified to ensure performance in humid or chemically exposed environments.
Surface treatments include zinc plating with passivation for enhanced corrosion protection, phosphate coating to improve lubrication during installation, and electroplated nickel for superior surface finish and wear resistance. These treatments effectively extend service life and optimize compatibility with various operating conditions.
Key characteristics of ISO 4161 fasteners include standardized metric coarse threads, hexagonal head designs with chamfered edges, and precise dimensional tolerances ensuring global interchangeability. Their mechanical attributes feature specified tensile strengths (minimum 800 MPa for class 8.8), appropriate yield ratios, and sufficient ductility. Additionally, they exhibit consistent torque-tension relationships and reliable clamping performance, making them a globally recognized choice for general industrial applications and mechanical engineering.
| Screw Thread d | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | M20 | |
| P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| c | min | 1 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 3 |
| da | max | 5.75 | 6.75 | 8.75 | 10.8 | 13 | 15.1 | 17.3 | 21.6 |
| min | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | |
| dc | max | 11.8 | 14.2 | 17.9 | 21.8 | 26 | 29.9 | 34.5 | 42.8 |
| dw | min | 9.8 | 12.2 | 15.8 | 19.6 | 23.8 | 27.6 | 31.9 | 39.9 |
| e | min | 8.79 | 11.05 | 14.38 | 16.64 | 20.03 | 23.36 | 26.75 | 32.95 |
| m | max | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
| min | 4.7 | 5.7 | 7.64 | 9.64 | 11.57 | 13.3 | 15.3 | 18.7 | |
| mw | min | 2.5 | 3.1 | 4.6 | 5.6 | 6.8 | 7.7 | 8.9 | 10.7 |
| s | max | 8 | 10 | 13 | 15 | 18 | 21 | 24 | 30 |
| min | 7.78 | 9.78 | 12.73 | 14.73 | 17.73 | 20.67 | 23.67 | 29.16 | |
| r | max | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1 | 1.2 |
Hexagon flange nuts sourced with plain or serrated bearing faces to suit the approved joint design.
Machinery and equipment joints requiring a wider integrated bearing surface, subject to engineering approval.
Suitability must be approved against the customer drawing, joint design and service conditions. Product-specific numbers are not published until confirmed by Shuojia and the selected manufacturing partner.
Drawing- and sample-based requests are reviewed with qualified manufacturing partners. State any required material certificate, dimensional report, thread-gauge result, hardness record, coating-thickness report or third-party inspection before quotation.
State the complete standard designation and revision for the Hexagon Flange Nut, or attach a controlled drawing. Similar product names do not guarantee dimensional interchangeability.
Specify the required material, property class or grade for the Hexagon Flange Nut. The proposed supply is confirmed against those requirements before quotation.
Confirm thread, nut grade, flange style, serration direction, finish and mating-part specification. Add any tolerances or mating-part details that control fit or function.
State the service environment, coating system, colour, thickness and corrosion-test requirement. Shuojia will confirm the available Hexagon Flange Nut sourcing route against the RFQ.
Request the exact records needed, such as material certificates, dimensional results, thread-gauge checks, hardness results or coating-thickness reports. Availability is confirmed in the quotation.
They depend on the final Hexagon Flange Nut specification, quantity, tooling, finish, inspection and packing. The written quotation confirms all three before an order is placed.
Send the standard or drawing, material and grade, dimensions, finish, quantity, packing, documentation, destination and required delivery date for the Hexagon Flange Nut.
