300A 4-Stud Bus Bars – Distribution Block w/Cover – Red/Black

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One of our all-time most popular products! Designed to organize electrical connections, these 300A 4-Stud bus bars are suitable for many applications. 


  • 4 stainless steel 3/8″ studs
  • 6 stainless steel screws (#8-32)
  • Nickle-plated Brass contact plate
  • Stainless steel hardware – suitable for marine environments
  • Detachable cover included 
  • Dimensions: 1 & 1/4” Wide x 2 & 1/4” Tall x 6 & 5/16” Long
  • 300 Amps continuous current on 3/8″ stud connection
  • 20 Amps continuous on screw connection
  • Voltage range: 0-64V DC
  • Terminal torque: 10 ft·lbs.

**We recommend a small amount of nickel anti-seize be applied to the threads to prevent galling.**



These bus bars have four 3/8″ studs and six #8-32 machine screws. Bus bars act as a central hub, allowing you to connect multiple electrical components without creating a hazardous mess of wires. Made from a nickel-plated brass bar, these bus bars won’t tarnish or oxidize, a leading cause of connection failure. The bolt hardware is type 316 stainless steel and will not rust even in marine environments.  A plastic cover is included to prevent accidental contact to exposed surfaces. Two holes and screws are provided for mounting.

Recommended Accessories:

Additional information

Weight 1.24 lbs
Dimensions 8 × 7 × 2 in

2 reviews for 300A 4-Stud Bus Bars – Distribution Block w/Cover – Red/Black

  1. Dan Casey (verified owner)

    I received these with fast shipping and a great deal !…. These buss bars are heavy duty and very well built

  2. tony (verified owner)

    solid built.. I”m buying second set today.

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Do you ship oversea?

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We only ship overseas if you have a freight forwarder you work with.


Is the bus bar made of copper or brass?

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The bus bars are brass.


I have 6 batteries. Can I stack 2 connectors on each stud and have the last stud for the output or do I have to buy a 8 stud bus bar?



You can stack two lugs on each stud.