Blackburn ASL 500-258 NTN AL COMP STACK LUG 2 HOLE 500 KCMIL

Yes. The ASL 500-258 NTN is a two-hole stacking lug with a 5/8 inch bolt size, so it lands on a bus pad or ground bar drilled for 5/8 inch bolts. Two holes rather than one means it resists rotation on the pad, which is what you want on a 500 kcmil feeder termination.

The ASL 500-258 NTN is an aluminum-bodied, tin-plated compression lug built to ANSI C119.4, which is the standard covering connectors for aluminum and copper conductors. The tin plating on the aluminum body is what lets it terminate on either metal and sit against a copper or aluminum pad without a dissimilar-metal problem at the bolted joint.

A stacking lug has a flat tongue profile that lets two or more lugs bolt face to face on the same pair of 5/8 inch holes, so you can land multiple 500 kcmil conductors on one bus pad or ground bar when you've run out of drilled positions. Standard two-hole lugs with a formed or offset tongue won't stack cleanly. If you only have one conductor per pad, you don't need the stacking version.

Overall length is 7.375 inches. That is the barrel plus tongue, so budget that much straight run off the pad plus the conductor bending radius when you're checking gutter space or the back of a switchgear section. It's a long lug, and on tight panel gutters the length is usually what bites you, not the wire.

No insulation on it. The lug ships bare tin-plated aluminum, so any covering over the barrel and the exposed conductor is yours to add, whether that's heat shrink, a lug boot, or tape per your spec. Plan on it if the termination is in a compartment where phase spacing or accidental contact is a concern.

Compression, like the ASL 500-258, is a permanent crimped termination: it needs a hydraulic tool and the correct die, but it gives a uniform joint that doesn't need re-torquing and won't loosen as the aluminum conductor relaxes. A mechanical set-screw lug installs with nothing but a hex key and can be reused, which suits a temporary or field-modified termination. On a 500 kcmil feeder you'll typically see compression specified where the joint is buried in gear and nobody is coming back to check torque.

Country of origin is the United States, which is what a government, school district, or federally funded project needs on the submittal. It also carries ANSI C119.4, the connector standard specifiers usually call out for this class of termination.

The lug sells as a single piece, each, and it's the connector only. Bolts, nuts, and washers for the 5/8 inch holes are ordered separately, and so is the compression die if your crew doesn't already have one for this barrel. Order one lug per conductor being terminated.

Blackburn ASL 500-258 NTN. The ASL prefix is the aluminum stacking lug family, 500 is the conductor size in kcmil, and 258 reflects the two 5/8 inch bolt holes. Quote the full string including the NTN suffix so you get the tin-plated version rather than a bare one.