3/8"-16 Thread Female Brass Battery Terminal Post Adapter Battery Charging Post Terminals for 3/8" Stud Extension, Pack of 4

An SAE 3/8 inch-16 stud on your battery is what this fits, and it fits it the female way round: the adapter slides over the stud and threads onto it, rather than screwing into anything.

Female on an imperial stud, four to a box

Sizing is the whole decision here. The thread quoted by the supplier is SAE 3/8 inch-16 and the adapter is female, so your battery must already carry a threaded stud of that exact size and pitch. Note that the supplier writes the size fully once and then shortens it to 3/8 inch on the second mention; the complete designation is 3/8 inch-16, and half a designation is not a thread size. Four pieces to a box, which is two matched pairs rather than a single one.

Brass, and what brass is claimed to do

Brass is the metal, and the supplier attaches three claims to it: greater strength, good conduction, and corrosion that is reduced rather than stopped. That last distinction is the one to hold on to, because a threaded joint on a battery terminal is exactly where corrosion likes to settle and set hard. Once fitted, each piece finishes as a tapered post: 19 mm across for positive duty and 17 mm for negative, which is what a normal top-post clamp is cut to grip.

Key features

• Four pieces supplied: two matched pairs, so both polarities are covered twice over.
• SAE 3/8 inch-16 female thread: threads down onto a stud of that size and pitch on the battery.
• Brass construction: named as the material in the supplier's opening line.
• Tapered top-post finish: 19 mm for positive duty, 17 mm for negative.
• Fits without alteration: the supplier calls it a direct fit with no modification needed.
• Tightens by hand: the description says fingers will do for tightening and for slackening.
• Battery types listed: the supplier names lead-acid alongside lithium.

Specifications

• Full thread designation: SAE 3/8 inch-16
• Thread gender: female
• Fits onto: 3/8 inch-16 threaded studs on the battery terminal
• Metal named: brass
• Cone for positive: 19 mm
• Cone for negative: 17 mm
• Pieces to a box: 2 pairs, 4 pieces

Where this description stops short

• Corrosion-proof is how the search summary above puts it. The supplier's own copy says corrosion is reduced. Reduced is therefore the claim we print.
• There is no ampacity figure and no voltage figure in the description, which is a real omission on hardware that sits directly in the battery path.
• No torque value is quoted for the threaded joint; the supplier offers only that hand pressure will do.
• Height, across-flats size and mass are all missing, so bonnet or terminal clearance cannot be checked before delivery.
• The supplier abbreviates the thread to 3/8 inch after stating it in full. Order against the full 3/8 inch-16 designation, not the short form.

Four brass pieces that turn imperial threaded studs into ordinary tapered posts, sold on the size of the thread far more than on anything else about them, and worth ordering only once you have read your own stud with a gauge rather than by eye.

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.