ISO 14579 Hexalobular (Torx®) Socket Head Cap Screws Technical Datasheet
ISO 14579 Hexalobular (Torx®) Socket Head Cap Screws
ISO 14579 specifies the dimensions, mechanical requirements, and performance characteristics for hexalobular (Torx®) socket head cap screws with thread sizes from M2 to M20, Product Grade A. These screws feature a cylindrical head with an internal six-lobed drive, providing significantly improved torque transmission and reduced cam-out compared to conventional hex socket screws. The current edition (ISO 14579:2011) was confirmed in 2024 and remains current.
ISO 14579 screws are widely used in industries where reliable torque control, automation, and reduced tool wear are essential, including automotive, electronics, robotics, medical equipment, aerospace, machine building, and industrial automation.
Table of Contents
ITEM CODE: 1044
Standards
| Standard | Status |
|---|---|
| ISO 14579 | International Standard |
Dimensions
| d1 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 |
| d2 | 3.8 | 4.5 | 5.5 | 7 | 8.5 | 10 | 13 | 16 |
| k | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| t | 1 | 1.1 | 1.3 | 2 | 2.5 | 3 | 4 | 5 |
| A | 1.75 | 2.4 | 2.8 | 3.95 | 4.5 | 5.6 | 7.95 | |
| Drive | T6 | T8 | T10 | T20 | T25 | T30 | T45 | T50 |
all dimensions in mm
Download Technical Datasheets
Stainless Steel
| Grade | Download |
|---|---|
| A2-70 (SS304) | ⬇️ Download Datasheet |
| A4-70 (SS316) | ⬇️ Download Datasheet |
Dimensions Tolerances:
General dimensional tolerances for standard metric fasteners—including thread diameter, overall length, head diameter, head height/thickness, across flats, and washer dimensions—are available in our Standard Dimensional Tolerances for Common Metric Fasteners guide.
Certain product-specific features, such as drive recess dimensions, socket depth, countersink geometry, under-head radii, and other special characteristics, are governed by the applicable DIN or ISO product standard and may not included in this datasheet.
Mechanical Properties
| Material / Property Class | Tensile Strength | Yield Strength | Standard |
|---|---|---|---|
| Steel 10.9 | ≥ 1,040 MPa | ≥ 940 MPa | ISO 898-1 |
| Steel 12.9 | ≥ 1,220 MPa | ≥ 1,100 MPa | ISO 898-1 |
| Stainless Steel A2-70 | ≥ 700 MPa | ≥ 450 MPa | ISO 3506-1 |
| Stainless Steel A4-70 | ≥ 700 MPa | ≥ 450 MPa | ISO 3506-1 |
| Stainless Steel A4-80 | ≥ 800 MPa | ≥ 600 MPa | ISO 3506-1 |
| Titanium Grade 2 | Approx. 345 MPa | Approx. 275 MPa | ASTM B348 |
| Titanium Grade 5 | Approx. 895 MPa | Approx. 828 MPa | ASTM B348 |
Material Characteristics and Recommended Applications
| Material | Characteristics | Typical Applications |
|---|---|---|
| Carbon Steel | Economical, general-purpose fastening | Industrial machinery |
| Alloy Steel 10.9 | High tensile strength | Heavy machinery |
| Alloy Steel 12.9 | Maximum strength | Automotive, robotics |
| Stainless Steel A2-70 | Corrosion resistant | Food equipment, electronics |
| Stainless Steel A4-70 | Excellent marine corrosion resistance | Offshore & marine |
| Titanium | Lightweight, high strength, corrosion resistant | Aerospace, medical |
Technical Specifications
| Property | Specification |
|---|---|
| Standard | ISO 14579 |
| Head Style | Cylindrical Socket Head |
| Drive Type | Internal Hexalobular (Torx®) |
| Thread Type | Metric Coarse |
| Thread Direction | Right Hand |
| Product Grade | A |
| Thread Sizes | M2 – M20 |
| Material Options | Carbon Steel, Alloy Steel, Stainless Steel, Brass, Titanium |
| Property Classes | 10.9, 12.9 |
| Stainless Grades | A2-70, A4-70 |
| Finish Options | Plain, Black Oxide, Zinc Plated, Zinc Flake, Nickel Plated, Hot Dip Galvanized (where applicable) |
| Manufacturing Process | Cold Forged & Thread Rolled |
| Drive System | Hexalobular Internal Drive |
ISO 14579 Torx Socket Head Cap Screw Weight Chart
Weight in kgs. per 1,000 pcs. All weights are approximations.
| Diameter | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 0.155 | ||||||||||||
| 4 | 0.175 | 0.345 | |||||||||||
| 5 | 0.195 | 0.375 | 0.7 | ||||||||||
| 6 | 0.215 | 0.405 | 0.7 | 1.5 | |||||||||
| 8 | 0.255 | 0.465 | 0.8 | 1.7 | 2.5 | ||||||||
| 10 | 0.295 | 0.525 | 0.9 | 1.8 | 2.7 | 4.7 | |||||||
| 12 | 0.355 | 0.585 | 1 | 2 | 3 | 5.1 | 10.9 | ||||||
| 16 | 0.415 | 0.705 | 1.2 | 2.3 | 3.5 | 5.8 | 12.1 | 20.9 | |||||
| 20 | 0.495 | 0.825 | 1.4 | 2.7 | 4 | 6.5 | 13.4 | 22.9 | 32.1 | ||||
| 25 | 0.975 | 1.6 | 3.2 | 4.8 | 7.6 | 15 | 25.4 | 35.7 | 48 | 71.3 | |||
| 30 | 1.9 | 3.7 | 5.6 | 8.3 | 16.9 | 27.9 | 39.3 | 53 | 77.8 | 111 | 128 | ||
| 35 | 4.2 | 6.3 | 9.9 | 18.9 | 30.4 | 42.9 | 58 | 84.4 | 120 | 139 | |||
| 40 | 4.7 | 7.1 | 11 | 20.9 | 32.9 | 46.5 | 63 | 91 | 129 | 150 | |||
| 45 | 7.9 | 12.1 | 22.9 | 36.1 | 50.1 | 68 | 97.6 | 138 | 161 | ||||
| 50 | 8.6 | 13.2 | 24.9 | 39.3 | 54.5 | 73 | 106 | 147 | 172 | ||||
| 55 | 14.3 | 26.9 | 42.5 | 58.9 | 78 | 114 | 156 | 183 | |||||
| 60 | 15.4 | 28.9 | 45.7 | 63.4 | 84 | 122 | 165 | 194 | |||||
| 65 | 31 | 48.9 | 67.8 | 90 | 130 | 174 | 205 | ||||||
| 70 | 33 | 52.1 | 71.3 | 96 | 138 | 183 | 216 | ||||||
| 80 | 37 | 58.5 | 80.2 | 108 | 154 | 203 | 241 | ||||||
| 90 | 64.9 | 89.1 | 120 | 170 | 223 | 266 | |||||||
| 100 | 71.2 | 98 | 132 | 186 | 243 | 291 | |||||||
| 110 | 107 | 144 | 202 | 263 | 316 | ||||||||
| 120 | 116 | 156 | 218 | 283 | 341 | ||||||||
| 130 | 168 | 234 | 303 | 366 | |||||||||
| 140 | 180 | 250 | 323 | 391 | |||||||||
| 150 | 266 | 343 | 416 | ||||||||||
| 160 | 282 | 363 | 441 | ||||||||||
| 180 | 403 | 491 | |||||||||||
| 200 | 541 | ||||||||||||
| 220 | |||||||||||||
| 240 |
Applications
- Industrial machinery
- Robotics
- Factory automation
- Automotive assemblies
- Electric vehicles
- Consumer electronics
- Telecommunications equipment
- Medical devices
- Aerospace equipment
- Semiconductor manufacturing equipment
- Precision instruments
- Renewable energy equipment
- Industrial control panels
- Machine tools
Advantages
- High torque transmission capability
- Reduced cam-out compared to hex socket screws
- Longer driver bit life
- Lower risk of drive recess damage
- Ideal for automated assembly systems
- Better repeatability during production
- Suitable for high-speed assembly lines
- Compact cylindrical head for recessed mounting
- Available in high-strength property classes
- Excellent appearance after repeated servicing
- Improved operator productivity
- Lower maintenance costs due to reduced tool wear
Frequently Asked Questions
What is ISO 14579?
ISO 14579 specifies hexalobular (Torx®) socket head cap screws with cylindrical heads and internal Torx drives for metric threads from M2 to M20.
Why choose Torx over Hex Socket?
The hexalobular drive distributes torque more evenly, reducing cam-out, improving torque transfer, and extending tool life compared with conventional hex sockets.
Are ISO 14579 screws stronger than DIN 912 screws?
Not inherently. Strength depends on the material and property class (such as 8.8, 10.9, or 12.9). The main difference is the drive design, not the mechanical strength.
Are these suitable for automated assembly?
Yes. The Torx drive provides excellent bit engagement, making ISO 14579 screws a preferred choice for robotic and high-speed automated assembly lines.
Can ISO 14579 screws replace DIN 912 screws?
In many applications, yes, provided the head dimensions and design requirements are compatible. The Torx drive often offers better installation performance while maintaining similar head geometry.
Why are socket head cap screws preferred over hex bolts?
Socket head cap screws provide higher tightening torque, require less installation space, and are ideal for precision machinery where recessed mounting is needed.
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