Product Specifications
| Model / Specification | M5-M20 |
| Material | Carbon steel, Stainless steel |
| Spec. | 6.5 （M5） | 8 （M6） | 10 （M8） | 13 （M10） | 16 （M12） | 20 （M16） | 25 （M20） | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | |||
| d | Nominal | M5 | M6 | M8 | M10 | M12 | M16 | M20 | |||
| ds | Nominal | 6.5 | 8 | 10 | 13 | 16 | 20 | 25 | |||
| Max. | 6.487 | 7.987 | 9.987 | 12.984 | 15.984 | 19.980 | 24.980 | ||||
| Min. | 6.451 | 7.951 | 9.951 | 12.941 | 15.941 | 19.928 | 24.928 | ||||
| b | Max. | 9.75 | 11.25 | 13.25 | 16.40 | 18.40 | 22.40 | 27.40 | |||
| Min. | 9.25 | 10.75 | 12.75 | 15.60 | 17.60 | 21.60 | 26.60 | ||||
| dk | Flat head | Max. | 10 | 13 | 16 | 18 | 24 | 30 | 36 | ||
| Knurled head | Max. | 10.22 | 13.27 | 16.27 | 18.27 | 24.33 | 30.33 | 36.39 | |||
| Min. | 9.78 | 12.73 | 15.73 | 17.73 | 23.67 | 29.67 | 35.61 | ||||
| k | Max. | 4.5 | 5.5 | 7 | 9 | 11 | 14 | 16 | |||
| Min. | 4.32 | 5.32 | 6.78 | 8.78 | 10.73 | 13.73 | 15.73 | ||||
| s | Nominal | 3 | 4 | 5 | 6 | 8 | 10 | 12 | |||
| Max. | 3.08 | 4.095 | 5.095 | 6.095 | 8.115 | 10.115 | 12.142 | ||||
| Min. | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | 12.032 | ||||
| t | Min. | 2.4 | 3.3 | 4.2 | 4.9 | 6.6 | 8.8 | 10 | |||
| g1 | Max. | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 3 | |||
| g2 | Max. | 2 | 2.5 | 3.1 | 3.7 | 4.4 | 5 | 6.3 | |||
| ds1 | Max. | 3.86 | 4.58 | 6.25 | 7.91 | 9.57 | 13.33 | 16.57 | |||
| Min. | 3.68 | 4.40 | 6.03 | 7.69 | 9.35 | 12.96 | 16.30 | ||||
| e | Min. | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 13.72 | |||
| r | Min. | 0.25 | 0.4 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | |||
| Weight ≈ kg / 1000 pcs | - | - | - | - | - | - | - | ||||
Dimensions in mm. The bracketed sizes ((4.5), (5.5), (7)) are non-preferred. Data compiled from GB 5281-1985 for selection reference only; actual supply is subject to drawings and inspection reports.
Product Overview
The hexagon socket head shoulder screw (stripper bolt) is manufactured to GB 5281-1985. The screw has a cylindrical head with a hexagon socket, a precision ground smooth shoulder below the head, and a threaded end. The shoulder has high dimensional accuracy and a smooth surface, so it can be used as a pivot, guide shaft or locating pin, working with bearings, guide bushes or slide plates. It is widely used in moulds, jigs, automation equipment and precision machinery.
1. Product Features
- Cylindrical head with hexagon socket, driven with a hex key.
- Precision ground smooth shoulder for use as a pivot, guide or locating shaft.
- Threaded end for fixing.
- Grades 8.8, 10.9 and 12.9 for high strength.
- Materials: carbon steel (25#/35#/45#) and stainless steel (304/316).
2. Product Advantages
- Ground shoulder gives smooth rotation and accurate positioning.
- One screw does three jobs: locating, guiding and fastening.
- High degree of standardisation: the GB 5281 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
- Locating and guiding in moulds, jigs and fixtures.
- Pivot and guide shafts in automation equipment and manipulators.
- Use with bearings, guide bushes and slide plates.
- Stainless steel versions suit damp or mildly corrosive environments.
