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ALUM 2 HOLE CONNECTOR
Manufacturer Resources
Product Specs
- Connection Type:
- Compression
- Country Of Origin:
- United States (US)
- Product Group:
- Wire & Cable Management
- Product Type:
- Compression Lug Two Hole
- Selling Unit Of Measure:
- each
- Type2:
- Wire connectors
- Wire Size:
- 500 to 556 kcmil477(26/7) ASCR AWG
- Department:
- Electrical
- Product Subgroup:
- Connectors
- Product Size:
- 8-3/8 X 1-3/4 inches wide
Blackburn SAM 556 N – Frequently Asked Questions
1) What wire size does the Blackburn SAM 556 N aluminum two-hole lug take?
The SAM 556 N is a compression lug sized for 500 to 556 kcmil conductor, including 477 (26/7) ACSR. If your run is smaller than 500 kcmil, this barrel will not compress down onto it properly and you need a lug in that conductor's own range.
2) How big is the Blackburn SAM 556 N lug overall, and will it fit inside my gear?
It measures 8-3/8 x 1-3/4 inches. That is a long barrel-and-pad lug, so check the bending space and pad clearance in the enclosure or bus compartment before you land it, particularly in tight switchgear or a crowded pull section.
3) Is the SAM 556 N a compression lug or a mechanical set screw lug?
Compression. The SAM 556 N barrel is crimped onto the conductor with a hydraulic or battery compression tool and the correct die, so it is a one-time permanent termination. If you want a connection you can back off and re-land later, a set screw (mechanical) lug in the same conductor range is the type to buy instead.
4) Can I use an aluminum compression lug like the SAM 556 N on copper conductor?
The SAM 556 N is an aluminum-body two-hole compression connector sized for 500 to 556 kcmil and 477 (26/7) ACSR. Aluminum bodies of this type are commonly dual rated AL/CU, but confirm the AL9CU marking stamped on the barrel of the lug you receive before crimping it onto copper. If the marking says aluminum only, land copper with a copper or dual-rated lug.
5) Why would I use a two-hole lug instead of a one-hole lug on a 500 kcmil feeder?
Two mounting holes keep the lug from rotating on the pad under fault current or vibration, which is why they are called for on grounding connections, bus bars, and equipment pads on larger feeders. A single-hole lug can spin and loosen. The SAM 556 N is the two-hole style, so plan on a drilled or tapped pad with matching hole spacing.
6) What do I need besides the lug itself to land 500 kcmil with a SAM 556 N?
A hydraulic or battery crimper with the die that matches this barrel, plus the bolts, flat washers, and belleville or lock washers for the two-hole pad. Bolt hardware is not part of the connector. On aluminum conductor you will also want a wire brush and joint compound before the conductor goes in the barrel.
7) Is the Blackburn SAM 556 N made in the USA, and is it sold individually?
Made in the United States, and it sells one at a time, not in a bag or box quantity. On a three-phase feeder termination with a neutral you are ordering four, plus whatever you need for the ground.
8) What is the exact part number to order for the Blackburn 500-556 kcmil two-hole aluminum compression lug?
Blackburn SAM 556 N. That single MPN covers the part; there are no finish or size options to pick. Distributors matching a bill of material should quote it against the 500 to 556 kcmil / 477 (26/7) ACSR range rather than against an overall dimension.
How fast can I get the Blackburn SAM 556 N delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Blackburn SAM 556 N come with a warranty?
Absolutely. The Blackburn SAM 556 N is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Blackburn SAM 556 N?
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