Power armor specs is a note in Fallout.
Location
This can be downloaded into the Vault Dweller's Pip-Boy via dialogue with ZAX 1.2 in the Glow. A holodisk inventory item is not actually received.
Transcript
The T-51b powered infantry armor is designed with the latest passive defense features for both civilian and military disturbances. The back-mounted TX-28 MicroFusion Pack generates 60,000 Watts to power the HiFlo hydraulic systems built into the frame of the suit. Made of the latest poly-laminate composite, the T-51b shell is lightweight and capable of absorbing over 2,500 Joules of kinetic impact. The 10 micron silver ablative coating can reflect laser and radiation emissions without damage to the composite subsurface.