Sta-Kon H973U NON-INS TUB RING 1AN-1/0 3/8 90 DEG

The H973U takes 1 AWG through 1/0 wire. That covers the range typically used for service entrance, battery, and feeder conductors, so if you're terminating anything smaller than 1 AWG you need a different barrel size entirely - crimping a 2 AWG or smaller conductor in this barrel won't give you a reliable mechanical or electrical connection.

The 90 degree bend is for tight enclosures where a straight terminal would force the cable into a sharp radius or push the door closed against the conductor. With a 1 AWG to 1/0 cable, which is stiff, the pre-formed right angle lets the wire run parallel to the panel wall and turn onto the stud without bending stress at the crimp. If you have room to approach the stud head-on, a straight tubular ring terminal is simpler.

No. It's a non-insulated tubular ring terminal, bare copper barrel and tongue. That means you supply your own insulation at the termination - heat shrink tubing or a cable boot - if the installation requires covered conductors up to the lug. Non-insulated barrels do let you inspect the crimp and the conductor seating before you cover them.

It's a copper terminal. Copper barrels are intended for copper conductors; terminating aluminum wire in a copper-only lug creates a dissimilar-metal joint that corrodes and loosens over time. For aluminum feeders you want a lug rated AL9CU or an aluminum-specific compression connector.

Yes, a heavy-duty crimper. This is a tubular barrel sized for 1 AWG to 1/0 conductor, which is well beyond what a hand ratchet tool for insulated terminals can compress. You need a hydraulic or large mechanical crimper with the die that matches this barrel range. A soldered or hammer-struck connection on a conductor this size will not hold up to vibration or thermal cycling.

Mexico. For federal, state, or institutional jobs with domestic sourcing language in the spec, that matters - check the procurement requirement before you commit this part to a submittal package.