Product Specifications
| Model / Specification | M3 - M12 |
| Material | Carbon Steel |
| Thread size d |
M3 | M3 | M4 | M4 | M5 | M5 | M6 | M6 | M8 | M8 | M10 | M10 | M12 | M12 | ||
| Type | A | B | A | B | A | B | A | B | A | B | A | B | A | B | ||
| P | Type | Coarse | 0.5 | 0.5 | 0.7 | 0.7 | 0.8 | 0.8 | 1 | 1 | 1.25 | 1.25 | 1.5 | 1.5 | 1.75 | 1.75 |
| Fine | / | / | / | / | / | / | / | / | / | / | 1.25 | 1.25 | 1.25 | 1.25 | ||
| b | Min. | 4.5 | 4.5 | 6 | 6 | 7.5 | 7.5 | 9 | 9 | 10 | 10 | 12.5 | 12.5 | 15 | 15 | |
| ds | Nom. | 5 | 5 | 6 | 6 | 7 | 7 | 9 | 9 | 11 | 11 | 13 | 13 | 15 | 15 | |
| Max. | 4.97 | 4.97 | 5.97 | 5.97 | 6.97 | 6.97 | 8.97 | 8.97 | 10.97 | 10.97 | 12.97 | 12.97 | 14.97 | 14.97 | ||
| Min. | 4.9 | 4.9 | 5.9 | 5.9 | 6.9 | 6.9 | 8.9 | 8.9 | 10.9 | 10.9 | 12.9 | 12.9 | 14.9 | 14.9 | ||
| d1 | 4.2 | 4.2 | 5.1 | 5.1 | 6 | 6 | 7.8 | 7.8 | 9.6 | 9.6 | 11.4 | 11.4 | 13.2 | 13.2 | ||
| dk | Max. | 8 | 8 | 9 | 9 | 10 | 10 | 12 | 12 | 14 | 14 | 16 | 16 | 18 | 18 | |
| k | 0.8 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1.2 | 1.2 | 1.3 | 1.3 | 1.5 | 1.5 | 2 | 2 | ||
| L | 9.5 | 11 | 10.5 | 12.5 | 12.5 | 14.5 | 16 | 18.5 | 17 | 19.5 | 21 | 23.5 | 25 | 28 | ||
| c | 0.8 | 0.8 | 0.9 | 0.9 | 1 | 1 | 1.4 | 1.4 | 1.7 | 1.7 | 2 | 2 | 2.3 | 2.3 | ||
| d2 | Nom. | 5 | 5 | 6 | 6 | 7 | 7 | 9 | 9 | 11 | 11 | 13 | 13 | 15 | 15 | |
| Max. | 4.97 | 4.97 | 5.97 | 5.97 | 6.97 | 6.97 | 8.97 | 8.97 | 10.97 | 10.97 | 12.97 | 12.97 | 14.97 | 14.97 | ||
| Min. | 4.9 | 4.9 | 5.9 | 5.9 | 6.9 | 6.9 | 8.9 | 8.9 | 10.9 | 10.9 | 12.9 | 12.9 | 14.9 | 14.9 | ||
| L2 | 6 | 6 | 6.5 | 6.5 | 7 | 7 | 9.5 | 9.5 | 9.5 | 9.5 | 12.5 | 12.5 | 16 | 16 | ||
| s | Rivet thick. | 0.5~2.0 | 1.5~3.5 | 0.5~2.0 | 1.5~4.0 | 0.5~2.5 | 2.0~4.5 | 0.5~3.0 | 2.5~5.5 | 0.5~3.5 | 0.5~3.5 | 0.5~3.5 | 3.0~6.0 | 0.5~3.5 | 3.0~6.5 | |
| Max. torque N·m | 2 | 2 | 5 | 5 | 8.5 | 8.5 | 11 | 11 | 26 | 26 | 50 | 50 | 80 | 80 | ||
Flat Round Head Rivet Nut — Product Introduction
The flat round head rivet nut is an internally threaded fastener installed on sheet metal or tubing through a pull-riveting method. Its head features a flat round shape and complies with the UNI 9201-1988 standard. During installation, the nut is simply inserted from one side of the sheet into a pre-drilled hole, and a rivet gun pulls the nut causing its tail to deform and expand, thereby clamping the nut firmly onto the sheet and providing a reliable threaded hole for subsequent bolt connections.
Common materials include carbon steel, stainless steel (A2/A4), and aluminum alloy. Surface treatments such as zinc plating, nickel plating, and passivation are available to meet different environmental and strength requirements.
I. Product Features
- Single-side installation, no back-side access required: Only the front side of the sheet needs to be reached, making it especially suitable for closed profiles, tubing, or situations where the back side is inaccessible.
- Flat round head design: The low-profile head with smooth edges leaves the sheet surface flat and attractive after installation, with minimal protrusion — ideal for appearance-critical applications.
- Standardized internal thread: Thread dimensions and tolerances conform to relevant standards, ensuring compatibility with standard bolts and screws and providing strong versatility.
- Multiple material options: Carbon steel, stainless steel (A2/A4), and aluminum alloy are commonly available; material can be selected to match the sheet and usage environment, avoiding galvanic corrosion.
- Strong clamping force after installation, resistant to rotation: After pull-riveting, the nut forms a firm mechanical lock with the sheet, offering vibration resistance and anti-loosening performance, capable of withstanding considerable tensile and torque loads.
II. Product Advantages
- Solves tapping difficulties on thin sheets: Provides high-strength, durable metal threads on thin sheets, thin-walled tubes, and other materials where tapping is impossible or insufficient in strength.
- Fast and efficient installation: Installation is quickly completed with a pneumatic or manual rivet gun, making it ideal for mass production and on-site assembly.
- Reliable connection, vibration-resistant and anti-loosening: The rivet nut forms a tight clamp with the sheet, preventing rotation and loosening — suitable for vibrating environments.
- Flat and attractive appearance: The flat round head sits flush with or slightly above the sheet surface, preserving the overall appearance and avoiding scratches to other components.
- Bolts can be repeatedly assembled and disassembled: The nut itself remains fixed; bolts can be screwed in and out multiple times without damaging the thread, facilitating easy maintenance.
- Wide range of compatible base materials: Can be installed on steel sheets, aluminum sheets, stainless steel sheets, plastics, composite materials, and various other thin-sheet materials.
III. Application Scope
Flat round head rivet nuts are widely used in thin-sheet connection applications requiring single-side installation of internal threads. Common fields include:
- Automotive manufacturing: Body sheet metal, chassis components, interior panels, roof racks, bumper brackets, etc.
- Rail transit: Compartment wall panels, equipment mounting plates, cable brackets, etc.
- Enclosures and cabinets: Electrical cabinets, control boxes, communication racks, instrument housings, etc.
- Home appliance manufacturing: Washing machines, refrigerators, microwave ovens, air conditioner housings, and other thin-sheet connections.
- Aerospace: Aircraft interior panels, thin-walled structural components, etc.
- Building and decoration: Metal curtain walls, ceiling systems, door and window frames, railings, etc.
- Furniture and office equipment: Metal furniture, office desks and chairs, printer and copier frames, etc.
- Shipbuilding and containers: Interior fit-outs, pipe supports, electrical equipment mounting, etc.
