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Heavy DutySeamless Corrosion Resistant Tin Plated Copper Lugs combine pure copper construction with a seamless pad to provide the ultimate performance in strength, conductivity and corrosion resistance. Thelug designand features a flared and chamfered barrel to facilitate cable insertion. These lugs are sized and designed to work with flexibly stranded copper wire and cable such as welding cable, marine battery cable, UL Listed battery cables, SAE battery cables, entertainment cable, diesel locomotive cable, and other similar flexiblecables.
The tin plating provides corrosion resistance which is superior to bare copper lugs. Utilities, telecom and other industries using high amperage connections all use tin plated lugs and terminals for power connections.
The hole sizes on the lugs are sized to fit the bolt of the same size so a 5/16 hole lug will fit a 5/16 inch bolt etc. The 5/16 lugs will also fit M8 metric as will the 3/8 lugs fit the M10 size metric bolts.
Also keep in mind the sizes of cables go from smaller to larger as so:
8 AWG Smaller
6 AWG
4 AWG
2 AWG
1 AWG
1/0 AWG (0 Gauge)
2/0 AWG (00 Gauge)
3/0 AWG (000 Gauge )
4/0 AWG (0000 Gauge) Larger
A side note about copper clad aluminum cable some of you are using...If you are using cheap CCA wire (copper clad aluminum) the sizes of that aluminum cable will be larger than copper since aluminum can't carry the same current as copper and therefor the cable size they use, while the same in name, will be larger than the copper awg size and will likely not fit in the same size lug. You'll need a size or maybe 2 larger...just ask us and we can help you figure it out. Again, these quality lugs are designed to be used on quality copper wire only.

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