Head Reading-Cup Profile and Deep Hex Socket
SHCS are identified by their heads. The small cylinder head replaces the six flat wrench faces of an external hex bolt. A small cup has a straight, vertical wall, a flat top, and a hexagonal socket in the centre that is deeper than a button-head or setscrew recess.
Why does depth matter?
Allen keys engage longer in deeper hex sockets. More engagement transmits more torque without camming out or rounding the corners, therefore socket head cap screws are trusted in high-torque couplings. The straight side wall keeps the assembly profile clean and snag-free by placing the head in a counterbored pocket flush with or just below the surface.
Why the Cylindrical Head Delivers More Locking Torque
Load capacity and locking torque are where the SHCS earns its place. Because the internal hex socket drives on the full depth of the key rather than on external corners, you can apply a larger tightening torque and reach a higher preload (clamp load) for a given diameter. A higher preload keeps the joint gripped under vibration, shock, and dynamic loads - the very failure modes that loosen ordinary fasteners.
For high-strength mechanical connections, material choice does the rest. Our socket head cap screws are commonly machined from alloy or carbon steel, stainless steel 304/316, or 6061/7075 aluminum, then finished with passivation, black oxide, plating, or anodizing drawn from our in-house surface-treatment range. The result is a fastener that holds its torque in demanding environments - from automation frames to medical enclosures.
Space Saving By Design - SHCS vs External Hex Bolt
The most touted advantage of a socket head cap screw is the clearance it provides. For an exterior hex bolt, you need a wrench that will clear the full width across the hex flats, plus room to swing it. The SHCS is simple, merely a straight axial hole for the Allen key, no clearance around the head for a wrench. Practically, that means:
Closer fastener spacing:
locate SHCS heads closer in crowded setups.
No wrench swing clearance:
perfect for blind corners, tight passages and stacked plates.
Flush or counterbored mounting.
The cylinder head fits into a pocket so nothing protrudes to catch wires or interfere with moving parts.
When every millimetre of a robotic arm or fixture counts, replacing an external hex bolt with a Socket Head Cap Screw (SHCS) can reduce the envelope and make the surrounding geometry easier.
Material Grades That Hold Preload Under Load
KEY-CNC machines SHCS from the same traceable stock used across our precision fastener range:
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Thread sizes, head diameters, shoulder lengths, and socket sizes are all set to your drawing. Every batch runs under our ISO 9001:2015 quality system and is RoHS-compliant, with material certificates and inspection reports available on request.
Full Round Head Hex Socket Screw Dimensions
(The following data is for reference only. Please refer to actual product specifications.)
| Nominal Diameter (d) | Pitch (p) | t (min) | dk (max) | dk (min) | k (max) | k (min) | s (max) | s (min) |
|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.7 | 3.14 | 2.86 | 1.6 | 1.46 | 1.56 | 1.52 |
| M2 | 0.4 | 1 | 3.98 | 3.62 | 2 | 1.86 | 1.56 | 1.52 |
| M2.5 | 0.45 | 1.1 | 4.68 | 4.32 | 2.5 | 2.36 | 2.06 | 2.02 |
| M3 | 0.5 | 1.3 | 5.68 | 5.32 | 3 | 2.86 | 2.58 | 2.52 |
| M4 | 0.7 | 2 | 7.22 | 6.78 | 4 | 3.82 | 3.08 | 3.02 |
| M5 | 0.8 | 2.5 | 8.72 | 8.28 | 5 | 4.82 | 4.095 | 4.02 |
| M6 | 1 | 3 | 10.22 | 9.78 | 6 | 5.7 | 5.14 | 5.02 |
| M8 | 1.25 | 4 | 13.27 | 12.73 | 8 | 7.64 | 6.14 | 6.02 |
| M10 | 1.5 | 5 | 16.27 | 15.73 | 10 | 9.64 | 8.175 | 8.025 |
| M12 | 1.75 | 6 | 18.27 | 17.73 | 12 | 11.57 | 10.18 | 10.025 |
| M14 | 2 | 7 | 21.33 | 20.67 | 14 | 13.57 | 12.21 | 12.032 |
| M16 | 2 | 8 | 24.33 | 23.67 | 16 | 15.57 | 14.21 | 14.032 |
| M18 | 2.5 | 9 | 27.33 | 26.67 | 18 | 17.57 | 14.21 | 14.032 |
| M20 | 2.5 | 10 | 30.33 | 29.67 | 20 | 19.48 | 17.23 | 17.05 |
Made to Your Drawing - or Designed From Scratch
This is where KEY-CNC adds the most value. We do not just sell catalogue screws; we produce a Socket Head Cap Screw (SHCS) built around your actual assembly. Two paths are open:
Drawing-based customization
send STEP, IGES, or DWG files and our English-speaking engineers return a DFM (design-for-manufacturability) review, usually within 24 hours, confirming thread, head height, socket depth, shoulder, and tolerances before any metal is cut.
Design-from-scratch
if you have a function but no drawing, we help define the geometry - head height versus clearance, socket size versus torque target, shoulder length versus stack-up - and deliver prototypes in 5–7 days, volume production in 10–18 days, shipping to North America and Europe in 3–7 business days.
Quality You Can Check
Our Shenzhen plant inspects every socket head cap screw for ISO 9001:2015 and RoHS compliance. CNC turning and milling maintain head diameter, socket concentricity, and thread pitch tolerances, and we check important parameters before shipment. KEY-CNC is a reliable one-stop shop for custom fasteners and precision metal parts with 16+ years of precision machining, 1,000+ cooperating clients, 95%+ repeat orders, and 1,200+ bespoke models.
If your next construction requires a tiny, sturdy, and spec-compliant fastener, talk to our engineers. Send a drawing or explain the junction, and we'll show you how a Socket Head Cap Screw (SHCS) can handle the load and save space.
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