Convert Kilopounds per Square Inch to Technical Atmospheres
Convert Kilopounds per Square Inch (ksi) to Technical Atmospheres (at) instantly and accurately.
Conversion Formula
at = ksi × 70.30695796
About Kilopounds per Square Inch
One ksi (kilopound per square inch) = 1,000 psi ≈ 6.895 MPa - the standard engineering stress unit in the US. ASTM A36 structural steel: 36 ksi yield, 58-80 ksi tensile. ASTM A325 high-strength bolts: 92 ksi proof load. AISC steel construction tables, FAA/MIL-SPEC aerospace allowables, and ASME Section VIII pressure vessel design all use ksi. Fracture toughness (K_IC) for steels: 50-200 ksi·√in. Convenient because it keeps large structural stresses as manageable 3-digit numbers. 1 ksi = 6.895 MPa.
About Technical Atmospheres
One technical atmosphere (at) = exactly 1 kgf/cm² = 98,066.5 Pa ≈ 0.968 standard atmospheres. The metric technical pressure unit used in pre-SI European and Japanese engineering for boilers, hydraulic cylinders, and compressed gas systems. A steam boiler at 10 at operates at 0.981 MPa; hydraulic presses are rated at 200-600 at. Still used parenthetically in old German and Japanese machinery manuals and standards (DIN 1301-3 legacy). Converts simply from kgf/cm²: 1 at ≡ 1 kgf/cm². 1 at = 98,066.5 Pa.
Quick Reference Table
| Kilopounds per Square Inch (ksi) | Technical Atmospheres (at) |
|---|---|
| 1 ksi | 70.307 at |
| 2 ksi | 140.614 at |
| 5 ksi | 351.535 at |
| 10 ksi | 703.07 at |
| 25 ksi | 1757.67 at |
| 50 ksi | 3515.35 at |
| 100 ksi | 7030.7 at |