Product Specifications
| Model / Specification | M2-M10 |
| Material | Carbon steel, Stainless steel |
| Thread size d | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | M8 | M10 | |
|---|---|---|---|---|---|---|---|---|---|---|
| P | Pitch | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| a | Max. | 0.8 | 0.9 | 1 | 1.2 | 1.4 | 1.6 | 2 | 2.5 | 3 |
| dk | Max.=nominal | 4 | 5 | 5.6 | 7 | 8 | 9.5 | 12 | 16 | 20 |
| Min. | 3.7 | 4.7 | 5.3 | 6.64 | 7.64 | 9.14 | 11.57 | 15.57 | 19.48 | |
| da | Max. | 2.6 | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 |
| k | Max.=nominal | 1.6 | 2.1 | 2.4 | 2.6 | 3.1 | 3.7 | 4.6 | 6 | 7.5 |
| Min. | 1.46 | 1.96 | 2.26 | 2.46 | 2.92 | 3.52 | 4.3 | 5.7 | 7.14 | |
| r | Min. | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 |
| R | ≈ | 3.2 | 4.0 | 5.0 | 6.0 | 6.5 | 8.0 | 10.0 | 13.0 | 16.0 |
| x | Max. | 1 | 1.1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.2 | 3.8 |
| Socket | T6 | T8 | T10 | T15 | T20 | T25 | T30 | T45 | T50 | |
| A | Ref. | 1.75 | 2.4 | 2.8 | 3.35 | 3.95 | 4.5 | 5.6 | 7.95 | 8.95 |
| t | Max. | 0.77 | 1.04 | 1.27 | 1.33 | 1.66 | 1.91 | 2.42 | 3.18 | 4.02 |
| Min. | 0.63 | 0.91 | 1.01 | 1.07 | 1.27 | 1.52 | 2.02 | 2.79 | 3.62 | |
| Weight ≈ kg / 1000 pcs | - | - | - | - | - | - | - | - | - | |
| Thread length b | Min. | - | - | - | - | - | - | - | - | - |
Dimensions in mm. The bracketed size (M3.5) is a non-preferred size. Data compiled from GB/T 2672-2017 for selection reference only; actual supply is subject to drawings and inspection reports.
Product Overview
The hexalobular socket pan head screw, also known as a Torx pan head screw, is manufactured to GB/T 2672-2017. Its pan (button) head has a larger bearing diameter than a cylindrical head, giving a wider bearing area so that thin sheets and plastic parts are less likely to be crushed. The drive is a hexalobular (six-lobe / Torx) socket with rounded load flanks that spread the tightening torque evenly, reduce cam-out and make the screw well suited to automated assembly lines.
1. Product Features
- Pan (button) head with a large bearing surface, suitable for clamping thin sheets, plastic parts and surfaces that must not be marked.
- Hexalobular (Torx) socket drive: six rounded lobes transmit torque evenly, resist cam-out and protect the recess.
- Thread sizes from M2 to M10, covering a wide range of applications.
- Available in carbon steel and stainless steel, selected according to environment and strength requirements.
- Surface finishes can be chosen to match different corrosion requirements.
2. Product Advantages
- Compared with a cross recess or a plain hex socket, the hexalobular recess together with a dedicated Torx driver allows higher tightening torque and reduces stripping and rejects during assembly.
- The pan head distributes clamping pressure more evenly, reducing indentation and deformation of the clamped part.
- High degree of standardisation: the GB/T 2672 dimensional system is complete, which simplifies export matching and second sourcing.
- Material and surface finish can be customised to balance strength, corrosion resistance and cost.
3. Application Scope
- Assembly of small structural parts in electronics, instruments and office equipment.
- Fastening of furniture, hardware products and sheet-metal parts.
- Stainless steel versions suit damp or mildly corrosive environments, as well as food and medical equipment.
- Automated assembly lines and robotic tightening stations that require high recess fit accuracy.
