ISO 14580 – Torx Socket Low Cap Head Screw
ISO 14580 specifies the characteristics of hexalobular socket cheese head screws with product grade A. Known for their deep cylindrical heads and high-torque hexalobular (Torx) drive, these fasteners are engineered for precision applications where space is limited but high clamping force is required.
The table below outlines the critical dimensional specifications for ISO 14580 fasteners, covering thread sizes from M2 to M10. These standardized measurements ensure consistent performance and global interchangeability for industrial assembly and mechanical engineering.
| ISO 14580 - Dimensions | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | |
| dk | Max | 3.8 | 4.5 | 5.5 | 6 | 7 | 8.5 | 10 | 13 | 16 |
| Min | 3.62 | 4.32 | 5.32 | 5.82 | 6.78 | 8.28 | 9.78 | 12.73 | 15.73 | |
| k | Max | 1.55 | 1.85 | 2.4 | 2.6 | 3.1 | 3.65 | 4.4 | 5.8 | 6.9 |
| Min | 1.41 | 1.71 | 2.26 | 2.46 | 2.92 | 3.47 | 4.1 | 5.5 | 6.54 | |
| t | Max | 0.84 | 0.91 | 1.27 | 1.33 | 1.66 | 1.91 | 2.29 | 3.05 | 3.43 |
| Min | 0.71 | 0.78 | 1.01 | 1.07 | 1.27 | 1.52 | 1.9 | 2.66 | 3.04 | |
| w | Min | 0.5 | 0.7 | 0.75 | 1 | 1.1 | 1.3 | 1.6 | 2 | 2.4 |
| Hexalobular Socket | Socket No. | 6 | 8 | 10 | 15 | 20 | 25 | 30 | 45 | 50 |
| A (Ref) | 1.75 | 2.4 | 2.8 | 3.35 | 3.95 | 4.5 | 5.6 | 7.95 | 8.95 | |
| r | Min | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 |
| a | Max | 0.8 | 0.9 | 1 | 1.2 | 1.4 | 1.6 | 2 | 2.5 | 3 |
| da | Max | 2.6 | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 |
| x | Max | 1 | 1.1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.2 | 3.8 |
| b | Min | 25 | 25 | 25 | 38 | 38 | 38 | 38 | 38 | 38 |
Note: All measurement are in mm
Disclaimer: The dimensions presented on this page are based on the applicable industry standard. However, actual product measurements may vary slightly due to manufacturing practices, material selection, surface finish, and specified tolerance classes. Buyers and sourcing professionals are encouraged to verify final specifications with the manufacturer or supplier prior to procurement, particularly for critical applications.
Legend & Dimension Definitions
- dk – Head diameter.
- k – Head height.
- t – Penetration depth of the hexalobular socket.
- w – Minimum wall thickness between the socket and the outer head diameter.
- Hexalobular Socket – Also known as Torx® drive; defined by the socket number and the gauge dimension A.
- r – Radius of the underhead fillet (min).
- a – Transition distance from the head to the shank (max).
- da – Transition diameter (max).
- x – Thread run-out (max length of unthreaded portion below head).
- b – Minimum thread length (for screws with lengths above a certain threshold).
- Ref (Reference value) – A theoretical dimension provided for information and design guidance only. Reference values (like A) are not requirements for inspection but assist in geometry calculation.
Technical Note
- ISO 14580: This standard specifies the characteristics of hexalobular socket cheese head screws. They are often preferred over slotted or cross-recessed heads for high-torque applications.
- Thread Length: The value b represents the minimum length of useful thread. For shorter screws, the thread may extend closer to the head.