ISO7379 Hexagon Socket Shoulder Screws
ISO 7379 shoulder screws are precision-engineered fasteners featuring a cylindrical shoulder, hexagon socket head and threaded end. The accurately controlled shoulder diameter provides a smooth and consistent bearing surface for positioning, pivoting and guiding components, while the socket head allows the screw to be securely tightened with a hex key. Compared with conventional screws, the shoulder design makes ISO 7379 shoulder screws particularly suitable for assemblies where dimensional accuracy, controlled clearance and reliable alignment are important.
We supply ISO 7379 shoulder screws in metric sizes with shoulder diameters from 6.5 to 25 mm, corresponding to thread sizes from M5 to M20. Different shoulder lengths and thread lengths are available according to the selected size, with steel and stainless steel options available for different mechanical and environmental requirements. High-strength steel versions such as property class 12.9 and stainless steel versions can be supplied according to the application and customer specifications.
Specification:
ISO 7379 shoulder screws are manufactured to the dimensional requirements of ISO 7379, with a precision-machined cylindrical shoulder, hexagon socket head and metric threaded end. The standard covers shoulder diameters from 6.5 to 25 mm, corresponding to thread sizes from M5 to M20. Key specifications include shoulder diameter and tolerance, shoulder length, thread diameter and pitch, thread length, head diameter, head height, hex socket size and socket depth. We supply ISO 7379 shoulder screws in alloy steel, carbon steel and stainless steel, with options such as 12.9 alloy steel, ss304 shoulder bolts and ss316 shoulder bolt available according to application requirements. Plain, black oxide, zinc-plated and other suitable surface finishes can also be provided. The table below summarizes the main dimensional, material, mechanical and surface treatment specifications.
| Item | Specification |
|---|---|
| Standard | ISO 7379 |
| Product Type | Hexagon Socket Head Shoulder Screws |
| Thread Type | Metric Coarse Thread |
| Thread Size | M5-M20 |
| Thread Standard | ISO261,ISO965 |
| Nominal Shoulder Diameter | φ6.5-φ25 |
| Shoulder Diameter Tolerance | h8 |
| Shoulder Surface | Precision-machined cylindrical surface |
| Steel Property Class | ISO 898-1 Class10.9 Class12.9 |
| Stainless Steel Standard | ISO 3506-1 |
| Stainless Steel Class | A2-70,A4-70,A2-80,A4-80 |
| Surface Treatment | Black Oxidation,Zinc Plated,Bright Finish,Passivation |
| Inspecition | Dimension,Thread,Mechanical Property,Coating |
Dimension Chart of ISO7379 Hexagon Socket Shoulder Screws:
EN 14399-3 HR system bolting assemblies are available in metric sizes from M12 to M36. Bolt dimensions, thread lengths and associated component dimensions are specified according to the requirements of EN 14399-3 and the applicable referenced standards. The following chart provides commonly supplied dimensions; detailed dimensions may vary according to the nominal diameter, bolt length and applicable configuration.
| Mon | Φ6.5(M5) | Φ8(M6) | Φ10(M8) | Φ13(M10) | Φ16(M12) | Φ20(M16) | Φ25(M20) |
| d max | 6.487 | 7.987 | 9.987 | 12.984 | 15.984 | 19.98 | 24.98 |
| d min | 6.451 | 7.951 | 9.951 | 12.941 | 15.941 | 19.928 | 24.928 |
| d1 | M5 | M6 | M8 | M10 | M12 | M16 | M20 |
| P | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 |
| b max | 9.75 | 11.25 | 13.25 | 16.4 | 18.4 | 22.4 | 27.4 |
| b min | 9.25 | 10.75 | 12.75 | 15.6 | 17.6 | 21.6 | 26.6 |
| dk max | 10 | 13 | 16 | 18 | 24 | 30 | 36 |
| dk min | 9.78 | 12.73 | 15.73 | 17.73 | 23.67 | 29.67 | 35.61 |
| d2 max | 3.86 | 4.58 | 6.25 | 7.91 | 9.57 | 13.33 | 16.57 |
| d2 min | 3.68 | 4.4 | 6.03 | 7.69 | 9.35 | 12.96 | 16.3 |
| e min | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 13.72 |
| k max | 4.5 | 5.5 | 7 | 9 | 11 | 14 | 16 |
| k min | 4.32 | 5.32 | 6.78 | 8.78 | 10.73 | 13.73 | 15.73 |
| a max | 2 | 2.5 | 3.1 | 3.7 | 4.4 | 5 | 6.3 |
| s max | 3.08 | 4.095 | 5.095 | 6.095 | 8.115 | 10.115 | 12.142 |
| s 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 |
ISO7379 Hexagon Socket Shoulder Screws：
Machinery & Mechanical Assemblies
ISO 7379 shoulder screws are widely used in machinery and mechanical assemblies where components require accurate positioning, support or controlled movement. The precision-machined shoulder can act as a bearing or pivot surface for levers, brackets, rollers and other moving components, while the threaded end secures the assembly in position.
Jigs, Fixtures & Tooling
The controlled shoulder diameter of ISO 7379 shoulder screws makes them suitable for jigs, fixtures, tooling and precision equipment. They can be used as locating pins, guide points, pivot points and mounting elements where consistent dimensions and repeatable component positioning are important.
Automotive & Industrial Equipment
ISO 7379 shoulder screws can also be used in automotive components, industrial equipment and automated machinery for mounting, guiding and pivoting applications. Stainless steel shoulder screw can be selected for assemblies exposed to moisture or corrosive environments, while high-strength alloy steel shoulder screw are suitable for applications requiring higher mechanical performance.