Socket Head Cap Screws
| Standard | DIN 912 · ISO 4762 · ASTM A574 |
|---|---|
| Material | 42CrMo / SCM435 / 40Cr |
| Strength Grade | 10.9 / 12.9 |
| Size Range | M3-M24 |
| Surface Treatment | Black Oxide / Zinc Flake |
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Product Description
Product Description & Key Specifications
Socket head cap screws are high-strength internal hex drive screws used where compact head diameter, high clamp load and tool access from above are required. This range is supplied in 42CrMo, SCM435 and 40Cr with 10.9 / 12.9 strength options to DIN 912, ISO 4762 and ASTM A574 references.
They are used in machinery housings, tooling, rail equipment, EV fixtures, aerospace ground equipment, renewable energy accessories and precision assemblies. Compared with ordinary pan head screws, socket head cap screws support higher strength and more controlled tightening, but the mating thread and washer surface must be suitable for the clamp load.
Black oxide is common for machinery and controlled indoor assemblies, while zinc flake can be selected for better corrosion performance and controlled coating thickness. RFQs should confirm size, length, grade, thread pitch, finish, certificate requirements and whether locking nuts or wedge lock washers are needed.
| Product type | Socket head cap screws / internal hex cap screws |
|---|---|
| Standards | DIN 912 / ISO 4762 / ASTM A574 |
| Material | 42CrMo / SCM435 / 40Cr |
| Strength grade | 10.9 / 12.9 |
| Size range | M3-M24 |
| Common models | M3 x 8, M4 x 10, M5 x 12, M6 x 16, M8 x 25, M10 x 30, M12 x 40, M16, M20, M24 |
| Drive and head | Cylindrical socket head with internal hex drive |
| Surface finish | Black oxide / Zinc flake |
| Matched hardware | All-metal lock nuts, wedge lock washers, flat washers and tapped components |
| Documentation | MTC, CoC, hardness, tensile, dimensional and coating report on request |
Dimensions & SpecificationsDIN 912 / ISO 4762
Technical Drawing
Dimensional Table
| Parameter | M1.4 | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 | M36 | M42 | M48 | M56 | M64 | M72 | M80 | M90 | M100 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1|1.25 | 1|1.25|1.5 | 1.25|1.5|1.75 | 1.5|2 | 1.5|2 | 1.5|2|2.5 | 1.5|2|2.5 | 1.5|2|2.5 | 2|3 | 2|3 | 2|3.5 | 2|3.5 | 3|4 | 3|4.5 | 3|5 | 4|5.5 | 4|6 | 4|6 | 4|6 | 4|6 | 4|6 |
| dk/max | 2.6 | 3 | 3.8 | 4.5 | 5.5 | 7 | 8.5 | 10 | 13 | 16 | 18 | 21 | 24 | 27 | 30 | 33 | 36 | 40 | 45 | 50 | 54 | 63 | 72 | 84 | 96 | 108 | 120 | 135 | 150 |
| dk/min | 2.46 | 2.86 | 3.62 | 4.32 | 5.32 | 6.78 | 8.28 | 9.78 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | 26.67 | 29.67 | 32.61 | 35.61 | 39.61 | 44.61 | 49.61 | 53.54 | 62.54 | 71.54 | 83.46 | 95.46 | 107.46 | 119.46 | 134.37 | 149.37 |
| da/max | 1.8 | 2 | 2.6 | 3.1 | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 | 30.4 | 33.4 | 36.4 | 39.4 | 45.5 | 52.6 | 63 | 71 | 79 | 87 | 97 | 107 |
| e/min | 1.5 | 1.73 | 1.73 | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 13.72 | 16 | 16 | 19.44 | 19.44 | 21.73 | 21.73 | 25.15 | 27.43 | 30.85 | 36.57 | 41.13 | 46.83 | 52.53 | 62.81 | 74.21 | 85.61 | 97.04 |
| k/max | 1.4 | 1.6 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 42 | 48 | 56 | 64 | 72 | 80 | 90 | 100 |
| k/min | 1.26 | 1.46 | 1.86 | 2.36 | 2.86 | 3.82 | 4.82 | 5.70 | 7.64 | 9.64 | 11.57 | 13.57 | 15.57 | 17.57 | 19.48 | 21.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 41.38 | 47.38 | 55.38 | 63.26 | 71.26 | 79.26 | 89.13 | 99.13 |
| r/min | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 1.0 | 1.0 | 1.0 | 1.0 | 1.2 | 1.6 | 2.0 | 2 | 2 | 2 | 2.5 | 2.5 |
| s/min | 1.32 | 1.52 | 1.52 | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | 12.032 | 14.032 | 14.032 | 17.05 | 17.05 | 19.065 | 19.065 | 22.065 | 24.065 | 27.065 | 32.08 | 36.08 | 41.08 | 46.08 | 55.1 | 65.1 | 75.1 | 85.12 |
| s/max | 1.36 | 1.56 | 1.56 | 2.06 | 2.58 | 3.08 | 4.095 | 5.14 | 6.14 | 8.175 | 10.175 | 12.212 | 14.212 | 14.212 | 17.23 | 17.23 | 19.275 | 19.275 | 22.275 | 24.275 | 27.275 | 32.33 | 36.33 | 41.33 | 46.33 | 55.4 | 65.4 | 75.4 | 85.47 |
| t/min | 0.6 | 0.7 | 1 | 1.1 | 1.3 | 2 | 2.5 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13.5 | 15.5 | 18 | 19 | 24 | 28 | 34 | 38 | 43 | 48 | 54 | 60 |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Machinery Housings and Tooling
12.9 socket head cap screws are common in machinery housings, fixtures, tooling and equipment bases where compact high-strength fastening is needed.
Industrial equipment fastenersRailway and Vibration Assemblies
Zinc flake socket screws can be used in rail equipment and vibration-sensitive brackets with compatible locking nuts or wedge lock washers.
Railway fastenersAerospace Ground and Renewable Equipment
DIN 912 / ISO 4762 screws support selected aerospace ground equipment, EV fixtures and renewable energy assemblies where strength and socket drive access matter.
Aerospace fasteners03
Assembly
Recommended Matching Products
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Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Cold heading or machining of alloy steel socket screw blanks42CrMo / SCM435 / 40Cr material verification
Heat treatment for 10.9 / 12.9 strength gradesHardness, tensile and mechanical property inspection
Internal hex socket and cylindrical head formingSocket depth, head dimensions, thread gauge and length inspection
Black oxide or zinc flake surface finishingCoating thickness, appearance and corrosion test support when specified
Standard or drawing-based screw supplyMTC, CoC and dimensional report prepared on request
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FAQ
Common Questions Before RFQ
What are socket head cap screws used for?
They are used for compact high-strength fastening in machinery, tooling, equipment and precision assemblies.
What is the difference between DIN 912 and ISO 4762?
Both are common references for metric socket head cap screws. Use the project drawing to confirm exact dimensions.
What grades are available?
10.9 and 12.9 grades are available in alloy steel material routes such as 42CrMo, SCM435 and 40Cr.
Which finish should I choose?
Black oxide is common for machinery; zinc flake provides improved corrosion resistance with controlled coating thickness.
Can locking hardware be supplied?
Yes. Socket screws can be supplied with all-metal lock nuts, wedge lock washers or flat washers when specified.
Need DIN 912 / ISO 4762 socket head cap screws?
Send size, length, grade, material, finish, quantity and locking hardware needs. We can quote M3-M24 10.9 / 12.9 socket screws in black oxide or zinc flake finish.
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