Alloy Steel
Alloy Steel Hexagon socket head cap screws — inch series (Table 1 profile) — ASME B18.3
Material Selection · Hexagon Socket Head Cap Screws — Inch Series (Table 1 Profile)Alloy steel is commonly selected for fasteners that require higher strength after controlled heat treatment. Like plain carbon steel it has no inherent corrosion resistance and relies on a protective finish. Alloying and heat treatment can support higher property classes such as 10.9 or 12.9, but the actual class and test evidence are confirmed per order. Highly loaded joints in machinery, automotive and structural connections that specify 10.9 or 12.9. Magnetic. It is not a substitute for stainless where corrosion resistance is the requirement. The table below is controlled selection guidance, not a claim that every listed grade is supplied. Confirm the exact material, grade and mechanical requirements in the quotation.
Socket Flat Countersunk Head Cap Screw ASME B18.3To Alloy Steel
Socket Button Head Cap Screw ASME B18.3To Alloy Steel
Low Head Socket Cap Screw ASME B18.3To Alloy Steel
Cup Point Socket Set Screw ASME B18.3To Alloy Steel
Flat Point Socket Set Screw ASME B18.3To Alloy Steel
Cone Point Socket Set Screw ASME B18.3To Alloy Steel
Half Dog Point Socket Set Screw ASME B18.3To Alloy Steel
Socket Head Cap Screw ASME B18.3To Alloy SteelAlloy Steel dimensions
| Reference grade / class | Reference standard | Reference tensile (MPa) | Reference yield (MPa) |
|---|---|---|---|
| 8.8 | ISO 898-1 | 800 | 640 |
| 9.8 | ISO 898-1 | 900 | 720 |
| 10.9 | ISO 898-1 | 1000 | 900 |
| 12.9 | ISO 898-1 | 1200 | 1080 |
4 of 4 sizes shown.