Fastener choice shapes how long a build lasts and how easy it is to service. Two standard options in electronics, 3D printers, and aluminum furniture are Socket Head Cap Screws (SHCS) and Button Head Cap Screws (BHCS). Which should you keep on hand most of the time? SHCS. # What they are ## Socket Head Cap Screws (SHCS) SHCS have a tall head and a deep hex socket. The tool bites well, so you can apply high torque without slipping. Most are alloy steel and are suited to structural work and frequent service. [ISO 4762:2004](https://www.iso.org/standard/34460.html) ## Button Head Cap Screws (BHCS) BHCS use the same hex drive but with a shallow socket and a low, domed head. The drive size is smaller for a given thread size, so the tool bite is weaker. Pick them when looks matter or vertical clearance is tight. Expect lower strength and a higher risk of stripping under torque. [ISO 4762:2004](https://www.iso.org/standard/34460.html) # Mechanical differences ## Strength and torque SHCS take more torque thanks to their deeper sockets and larger head volumes. They fit load-bearing parts and assemblies that see regular adjustment. BHCS suit light to medium loads. Over-tightening strips them easily. [Fasto Screws](https://www.fastoscrews.com/news/button-head-vs-socket-head-screws-which-one-s-right-for-your-appl) ## Head clearance and profile SHCS need more headroom. BHCS sit lower, giving a cleaner face on panels and covers. Use BHCS when the head must sit flush with, or below, the surface. # Use cases ## SHCS: the workhorse - Printer frames, gantries, motor mounts, robotics joints, aluminum shop furniture, and electronics enclosures - Works with standard hex keys - Holds up to repeated service and retightening - Broad size and material range ## BHCS: the minimalist’s pick - Faceplates and visible panels where appearance matters - Spots with minimal overhead clearance - Consumer-facing surfaces where a low profile is key [SSTLS](https://www.sstls.com/why-are-button-head-cap-screws-preferred-over-other-screw-types) # Bottom line Stock SHCS as your default. They give strong tool engagement, high strength, and reliable performance across many builds. Use BHCS when clearance or appearance demands a low dome. Consider them a specialty choice.