Product Specifications
| Model / Specification | M2 – M10 |
| Material | Carbon Steel |
| Thd. size d |
M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | ||
| P | Pitch | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | |
| a | Max. | 0.8 | 0.9 | 1 | 1.4 | 1.6 | 2 | 2.5 | 3 | |
| b | Min. | 25 | 25 | 25 | 38 | 38 | 38 | 38 | 38 | |
| da | Max. | 2.6 | 3.1 | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | |
| dk | Max.=Nom. | 4 | 5 | 5.6 | 8 | 9.5 | 12 | 16 | 20 | |
| Min. | 3.7 | 4.7 | 5.3 | 7.64 | 9.14 | 11.57 | 15.57 | 19.48 | ||
| k | Max.=Nom. | 1.6 | 2.1 | 2.4 | 3.1 | 3.7 | 4.6 | 6 | 7.5 | |
| Min. | 1.46 | 1.96 | 2.26 | 2.92 | 3.52 | 4.3 | 5.7 | 7.14 | ||
| r | Min. | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | |
| R1 | ≈ | 3.2 | 4 | 5 | 6.5 | 8 | 10 | 13 | 16 | |
| x | Max. | 1 | 1.1 | 1.25 | 1.75 | 2 | 2.5 | 3.2 | 3.8 | |
| Rec. No. | 0 | 1 | 1 | 2 | 2 | 3 | 4 | 4 | ||
| M1 | Ref. | 1.9 | 2.7 | 3 | 4.4 | 4.9 | 6.9 | 9 | 10.1 | |
| Dep. | Type H | Max. | 1.2 | 1.55 | 1.8 | 2.4 | 2.9 | 3.6 | 4.6 | 5.8 |
| Min. | 0.9 | 1.15 | 1.4 | 1.9 | 2.4 | 3.1 | 4 | 5.2 | ||
| M2 | Ref. | 2.1 | 2.6 | 2.8 | 4.3 | 4.7 | 6.7 | 8.8 | 9.9 | |
| Dep. | Type Z | Max. | 1.42 | 1.5 | 1.75 | 2.34 | 2.74 | 3.46 | 4.5 | 5.69 |
| Min. | 1.17 | 1.25 | 1.5 | 1.89 | 2.29 | 3.03 | 4.05 | 5.24 | ||
| Thread length b | - | - | - | - | - | - | - | - | ||
Cross Recessed Pan Head Thread Rolling Screw — Product Introduction
The cross recessed pan head thread rolling screw (GB/T 6560-2014) is a fastener that forms an internal thread in ductile metal or plastic substrates by extrusion. It is also commonly known as a “triangular thread screw.” Its thread has an arc-shaped triangular cross-section; when driven into the pilot hole, it forms the mating thread by extrusion rather than cutting, achieving low driving torque and high locking performance.
I. Product Features
- Triangular thread structure: The thread cross-section is an arc-shaped triangle that forms the mating internal thread by extruding material in the pilot hole, classifying it as a special type of self-tapping screw.
- Standard pan head and cross recess: The head type and dimensions are identical to GB/T 818, using a standard cross recess (Type H or Type Z), compatible with common Phillips screwdrivers and power tools.
- Specification coverage M2–M10: Thread sizes range from M2 to M10, with nominal lengths covering 25 mm to 38 mm and above, meeting a wide range of assembly needs.
- Varied materials and grades: Available in carbon steel (grade 4.8, 8.8, 10.9, 12.9) or stainless steel (304, 316); surface treatments include blue-white zinc, colored zinc, Dacromet, and nickel plating.
- Customizable options: Supports combined Phillips-slot recesses, tamper-proof recesses, locking threads, and adhesive-patched screws per custom requirements.
II. Product Advantages
- Low driving torque, high locking performance: The extrusion forming of the triangular thread reduces insertion resistance while producing a tight thread fit, giving better locking than ordinary self-tapping screws.
- No tapping, no nut required: No pre-tapped internal thread is needed, nor a mating nut, simplifying assembly and lowering part cost.
- Suitable for harder materials: Compared with ordinary self-tapping screws, the triangular thread design allows it to tap into harder ductile metals such as sheet steel.
- High formed-thread strength: The extruded thread has continuous metal grain flow, so its strength exceeds that of cut-formed threads, making the joint more reliable.
- Large head bearing area: The pan head provides a larger bearing surface that disperses pressure when tightened, ideal for joining thin sheets or soft materials.
III. Application Scope
- Ductile metal sheets: Connection of ductile metals such as aluminum, copper, and magnesium alloys — the most typical application of thread rolling screws.
- Plastic part assembly: Self-tapping, self-locking joints in plastic components, widely used in electronics and home appliances.
- Electronics and precision equipment: Low-torque self-tapping joints in small electronic devices, instruments, and precision machinery.
- Automotive and appliances: Sheet-metal fastening of automotive interior trims and appliance housings and internal components.
- General industrial assembly: Thin-sheet metal structures requiring tapping-free, rapid assembly.
