Hexalobular Socket Screws is also called Torx or Plum blossom groove screws.They are a relatively common type of anti-theft security screws on the market. They have a special structural design that can effectively increase security and prevent the fastened items from being stolen. Plays an important role in the security of homes, businesses and public places. Widely used in high-speed rail, automobiles, machinery, molds, electronics and construction fields.
There are also many national and international standards for plum blossom slot (Torx) pan head screws, such as plum blossom slot cylindrical head screws GB/T 2671.2-2004, plum blossom slot pan head screws GB/T 2672-1986, and plum blossom slot countersunk head screws GB/T 2673-1986. 90°, Torx countersunk head screws GB/T 2674-2017 90°, Torx round head self-tapping screws ISO 14585-2001, etc. These standards specify in detail the technical indicators of screw materials, hardness, heat treatment, tensile testing and other aspects.
ISO14583 plum-shaped pan head screws made of carbon steel or stainless steel (can be customized). Surface treatment: galvanized, whitewashed, etc. Main specifications: M2-M10
Carbon steel strength grades include 4.8, 6.8, 8.8, 10.9, etc. Stainless steel grades include A2-70, A4-70, etc.
The Specification Form of ISO14583 is as bellow
| ISO14583 | M | ||||||||||
| D | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 8 | 10 | ||
| 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 size | 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 size | 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 | 5 | 6 | 6.5 | 8 | 10 | 13 | 16 | |
| x | max | 1 | 1.1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.2 | 3.8 | |
| Socket No. | 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 | ||
Product standard of this physical picture: ISO14583
Spec:M4-0.7 Strength Class： Material:SUS304 Surface treatment :Plain
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