Browse every metric socket (Allen / hex drive) fastener in one place. From high-strength socket head cap screws to low-profile button and flat (countersunk), plus low head and set screws, Monster Bolts stocks the sizes and materials you actually use—including popular M3 screws for electronics and machinery.
Socket Head Cap Screws
Maximum preload strength with a deep hex drive and cylindrical head. The workhorse for machinery and robotics.
- DIN 912 / ISO 4762
- 12.9 alloy, A2/A4 stainless, titanium
- Finishes: black oxide, zinc, stainless
Button Head Socket Screws
Low-profile rounded head reduces snags and looks clean on exposed surfaces.
- ISO 7380 profile
- Great for covers, panels, guards
- Alloy / stainless / titanium options
Flat Head (Countersunk)
Flush installation where clearance matters and sliding interfaces must remain smooth.
- DIN 7991 / ISO 10642
- Precision countersink for clean sit
- Alloy / stainless selections
Low Head Socket Cap
Space-saving head height without going fully countersunk—retains a strong hex drive.
- DIN 7984 low head
- Compact head, reliable drive
- Commonly in 12.9 alloy steel
Socket Set Screws (Cup Point)
Secure collars, pulleys, and knobs to shafts. Cup point bites and holds under vibration.
- DIN 916 / ISO 4029
- High-hardness alloy steel
- Wide size coverage (incl. M3)
FAQs
Are socket screws the same as hex or Allen screws?
Yes—socket screws are driven by an internal hex (Allen) key and are commonly called “hex socket” or “Allen” screws.
What Allen key fits an M3 socket screw?
M3 typically uses a 2.5 mm hex key. Always confirm with the product listing or the torque/spec chart.
Which socket head style is strongest?
Socket head cap (DIN 912) generally supports the highest preload due to deep drive engagement and robust head geometry.
Need help choosing? Call (850) 764-2658 or email support@MonsterBolts.com — we’ll match the right spec, material, and torque for your application.
