3/8" Battery Bulkhead Connectors, 300A Remote Battery Terminals Thru Panel Battery Jump Post Remote Terminal Jumper W/Terminal Cover for Relocation (1 Pair)

Two dimensions settle whether this suits your panel before any electrical figure does: it wants a hole of 1-1/4 inches, or 31.75 millimetres, through material no thicker than 0.3 inches, which is 7.62. Cut that hole, bolt the connector through and the far side of the joint lives behind the panel from then on, so it becomes a connection you have no way to inspect again short of pulling the panel back off.

What rated up to 300A is doing

The exact wording is rated up to 300A high current, and the qualifier is load-bearing. Up to describes a ceiling, not a figure you may sit at all day. The search listing quietly drops those two words and says the connector carries 300A, which is a firmer promise than the description ever makes. Voltage is put at DC 12V with a maximum of DC 48V. No duty cycle, no ambient temperature and no derating information comes with the ceiling.

Nylon body, brass through the middle

The housing is nylon and the stud running through it is brass at 3/8 inch, which is 9.53 millimetres, with brass nuts to match. Silicone covers appear in the fitment line, post covers and stud terminal covers, both named in the plural with no quantity attached. The supplier also recommends professional installation, and that recommendation is as close as this description comes to a caution about anything.

Boats in the list, no rating for them

Marine and boat battery accessory connections sit in the compatibility line beside cars, vehicles, RVs, solar cells and electrical equipment generally. A feed-through fitting in a bulkhead is precisely where an ingress rating would earn its money, and none is quoted: no IP figure, nothing about spray or immersion, and no seal or gasket described.

Key features

• Power through a solid panel: current crosses a solid surface, metal included, instead of running heavy cable the long way around it.
• 300A ceiling: the supplier's upper current figure, quoted with its up-to qualifier intact.
• 3/8 inch brass stud: brass stud and brass nuts, sized for a common heavy ring terminal.
• Silicone covers on both ends: post covers and stud terminal covers come as part of the fitment.
• Thin-panel mounting: designed to clamp through anything up to 0.3 inches thick.
• Several jobs, one fitting: named as a jump post, a jumper start point, a junction post block and a battery charging post.

Specifications

• Current ceiling: rated up to 300A
• Volts stated: DC 12V, maximum up to DC 48V
• Stud and nuts: brass, 3/8 in, being 9.53 mm
• Body build: nylon
• Covers: silicone post covers and stud terminal covers
• Panel thickness accepted: 0.3 in or less, being 7.62 mm
• Hole to drill: 1-1/4 in, being 31.75 mm
• Roles named: bulkhead cable connection, jump post, jumper start, junction post block, battery charging post

Points to weigh up

• Quantity never appears in the supplier description. One Pair comes from the product title, and that is where we have taken the count from.
• The search listing says the connector carries 300A. The description says rated up to 300A, and the weaker of those is what we have printed.
• The search listing also puts this in a boot-mount setup. The description gives no mounting location whatever, speaking instead of customising or relocating a battery and its wiring.
• The brass nuts come with no tightening torque, which is the figure a 300 amp threaded joint most wants.
• Marine use is claimed with no ingress or immersion rating to back it, and the current figure rests on no cited standard either.
• Two tokens arrived damaged. The word professional has lost a letter, making it a loss, and the compatibility line closes on a doubled full stop, making that an insertion. Neither has been reproduced above as supplier wording.
• Metric equivalents throughout are our conversions of the supplier's inch figures; the description is imperial only.
• Not a single safety warning or numbered procedure exists here. Hole size and panel thickness are fitting constraints, not an installation sequence.

Getting power across a bulkhead without drilling a cable-sized hole is the entire job here, and the care it deserves is all front-loaded, because the far side stops being visible the moment the panel goes back.

Returns, Refunds, and Replacements Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

For customers in Victoria, approximately 7-10 working days; For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days; For customers in WA, NT, and TAS, approximately 9-12 working days.