Product Specifications
| Model / Specification | M4 - M16 |
| Material | Carbon steel |
| Thread d |
M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | |
| P | Pitch (Coarse) | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 |
| Pitch (Fine) | / | / | / | 1 | 1 | 1.5 | 1.5 | 1.5 | |
| Pitch (Fine) | / | / | / | / | 1.25 | 1.25 | / | / | |
| b | Max | 0.8 | 1.0 | 1.2 | 1.5 | 1.8 | 2.0 | 2.5 | 2.5 |
| Min | 0.5 | 0.7 | 0.9 | 1.2 | 1.4 | 1.6 | 2.1 | 2.1 | |
| b1 | Max | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 2 | / | / |
| Min | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.5 | / | / | |
| d3 | Max | 5.18 | 6.18 | 7.72 | 10.22 | 12.77 | 13.77 | 17.07 | 19.13 |
| Min | 5 | 6 | 7.5 | 10 | 12.5 | 13.5 | 16.8 | 18.8 | |
| da | Max | 4.6 | 5.75 | 6.75 | 8.75 | 10.8 | 13 | 15.1 | 17.3 |
| Min | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | |
| e | Min | 8.63 | 9.93 | 12.53 | 16.34 | 20.24 | 22.84 | 26.21 | 30.11 |
| h | Max | 0.7 | 0.9 | 0.9 | 1.1 | 1.3 | 1.5 | 1.5 | 1.7 |
| Min | 0.5 | 0.7 | 0.7 | 0.9 | 1.1 | 1.3 | 1.3 | 1.5 | |
| h1 | Max | 1 | 1 | 1 | 1 | 1 | 1.2 | / | / |
| Min | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 1 | / | / | |
| m | Max | 3.5 | 4.2 | 5 | 6.5 | 8 | 9.5 | 11 | 13 |
| Min | 3.2 | 3.9 | 4.7 | 6.14 | 7.64 | 9.14 | 10.3 | 12.3 | |
| s | Max | 7 | 8 | 10 | 13 | 16 | 18 | 21 | 24 |
| Min | 6.64 | 7.64 | 9.64 | 12.57 | 15.57 | 17.57 | 20.16 | 23.16 | |
| n | Min | 0.3 | 0.3 | 0.3 | 0.5 | 0.5 | 0.5 | / | / |
| Max | 0.5 | 05 | 0.5 | 1 | 1 | 1 | / | / | |
| Proof Load(N) | 6800 | 11000 | 15500 | 28300 | 44800 | 65300 | 89700 | 123000 | |
| Weight/1000 | Type A | 1.09 | 1.48 | 2.18 | 4.55 | 8.13 | 11.79 | 16.35 | 22.24 |
| Type B | 0.79 | 1.18 | 2.37 | 5.16 | 9.77 | 13.95 | / | / | |
Product Introduction — Square Weld Nut
The square weld nut (GB/T 13680-1992) is a nut with a square base specifically designed for welding fixation. Its shape is square, and the bottom surface is typically designed with projection studs or protrusions, firmly welded to the surface of metal sheets or workpieces through projection welding, thereby forming a reliable threaded connection base on thin walls. The product is generally made of low-carbon structural steel (such as Q235-A, 08, 10, 15 steel, etc.), with excellent weldability and mechanical properties, and is widely used in various metal structural components requiring internal thread connections.
One Product Features
Standard square structure: The regular square shape facilitates positioning and installation, and prevents rolling during welding.
Bottom projection stud design: Protrusions or studs are provided at the four corners or around the bottom surface, which helps concentrate current, ensures weld quality, and improves welding strength.
Low-carbon steel material: Commonly uses Q235-A, 08, 10, 15 steel and other carbon steel materials with low carbon content, excellent weldability, and resistance to cracking.
Standard internal threads: Thread dimensions and tolerances comply with relevant national standards, matching well with ordinary bolts and screws.
Optional surface treatments: Galvanizing, blackening, phosphating, and other surface treatments are available to improve corrosion resistance.
Two Product Advantages
Strong welding, high torque resistance: The square base increases the contact area with the workpiece, and after multi-point welding, it is not easy to loosen or detach, and can withstand greater torque.
Space-saving, simplified structure: No tapping or additional auxiliary connectors are needed on the sheet; reliable threads are provided directly from the back, making the structure more compact.
Improved production efficiency: Suitable for rapid positioning and welding with automated projection welding equipment, reducing manual assembly steps and lowering overall costs.
Ideal for thin-plate connections: Especially suitable for thin-plate metal components that cannot be directly tapped or require frequent disassembly, effectively avoiding thread stripping on thin plates.
Strong versatility: Complies with GB/T 13680-1992 standard with unified dimensions and specifications, strong interchangeability, easy procurement and replacement.
Three Applications
Square weld nuts are widely used in the following fields:
Automotive manufacturing: Threaded connections for thin-plate components such as body panels, chassis, seats, and brackets.
Mechanical equipment: Metal structural components requiring internal threads such as chassis, cabinets, guards, and panels.
Building hardware: Metal doors and windows, railings, curtain wall connectors, and embedded parts.
Household appliances: Metal housings and internal bracket fixation for washing machines, refrigerators, air conditioners, and other home appliances.
Electronics and communications: Assembly of server cabinets, distribution boxes, and control cabinets.
Other thin-plate metal industries: Anywhere that requires forming a firm threaded connection on thin plates without access from the back.
