OEX ACX0033 Stud Single Terminal - Black

OEX ACX0033 Black Stud Single Terminal 250A with Grooved Brass Contact Post and Glass Filled Nylon Base

The OEX ACX0033 is the black coded negative counterpart to the ACX0032 red positive stud terminal, providing a panel mountable or surface mountable negative connection point at a more accessible location away from the battery post. It features a 28.8mm grooved brass contact post, two 3/8 16 thread brass stud terminals, a 20.6mm diameter stud with brass hex nut and lock washer, a 250A power rating, a glass filled nylon base and a black cap for negative terminal identification. Supplied individually with a one year warranty.

Product overview

The ACX0033 shares the same robust construction as the ACX0032, including the grooved brass contact post, dual 3/8 16 thread brass stud terminals, brass hex nut and lock washer and glass filled nylon base. Together the ACX0032 and ACX0033 form a matched colour coded positive and negative battery terminal pair, suited to relocated battery installations, battery box builds, auxiliary battery setups, dual battery systems and custom electrical builds where a clean, accessible and clearly identified terminal pair is required.

The 250A power rating provides substantial capacity for demanding negative and earth distribution in high current 12V and 24V automotive, marine, caravan, RV, 4WD and commercial vehicle electrical systems. The black cap provides immediate identification as the negative terminal and protects the contact post from moisture and contamination when not in use. Manufactured under ISO 9001 quality management certification with in house product testing at OEX's Brisbane facility.

Features and benefits

Grooved brass contact post for reliable low resistance connection: The 28.8mm grooved brass contact post provides excellent conductivity and secure mechanical engagement with cable lugs. The grooved profile prevents lug rotation during tightening, maintaining correct alignment and consistent contact pressure at the negative connection.

Two 3/8 16 thread brass stud terminals for multiple connections: Dual stud terminals allow multiple earth cables and negative circuits to be connected at the same terminal point, covering main battery negative cables alongside accessory earth returns, fuse block negatives and auxiliary circuit earth leads without requiring a separate earth distribution block.

250A power rating for high current negative distribution: Rated to 250A, the ACX0033 handles the combined negative and earth current of multiple high current circuits simultaneously, suited to large inverter earth connections, high powered amplifier earth systems, dual battery negative feeds and commercial vehicle auxiliary earth distribution.

20.6mm diameter stud with brass hex nut and lock washer: The 20.6mm stud diameter provides a large, robust connection platform. The brass hex nut and lock washer combination keeps connections secure under vibration, mechanical shock and thermal cycling in mobile vehicle applications.

Relocatable to more accessible locations: Negative terminal connections can be positioned at battery boxes, custom panels, bulkheads and auxiliary battery locations, keeping negative distribution clean, organised and professionally presented.

Glass filled nylon base for superior strength and heat resistance: Glass filled nylon provides significantly greater rigidity, impact resistance and thermal stability than standard nylon, resisting deformation and cracking in engine bays, battery compartments and underbonnet environments.

Black cap for negative terminal identification: The black cap provides instant negative polarity identification and protects the contact post from moisture and contamination when not in use, meeting standard colour coding conventions across automotive, marine and industrial applications.

Perfect pair with ACX0032 red positive terminal: The ACX0033 is the colour matched negative counterpart to the ACX0032, forming a complete professional colour coded positive and negative battery terminal pair with consistent construction, stud sizing and thread specification across both polarities.

ISO 9001 certified manufacturing: Produced under ISO 9001 quality management certification with in house testing at OEX's Brisbane facility, ensuring consistent quality and long term reliability.

Technical specs

Compatible with

The ACX0033 suits 12V and 24V automotive, marine, caravan, RV, 4WD and commercial vehicle battery installations requiring a 250A rated negative terminal connection point at a relocated or more accessible location. Compatible with standard cable lugs for 3/8 16 thread studs across a range of heavy gauge wire sizes. Pairs directly with the OEX ACX0032 red stud terminal for a complete colour coded positive and negative battery terminal pair. Complements OEX distribution blocks, ANL fuse holders, busbars and battery accessories for a complete battery management solution.

Frequently asked questions

What is the difference between the ACX0033 black and the ACX0032 red? The ACX0033 is the black coded negative variant and the ACX0032 is the red coded positive variant. Both share identical physical construction including the grooved brass contact post, dual 3/8 16 thread stud terminals, 20.6mm stud diameter and glass filled nylon base. The ACX0033 carries a confirmed 250A power rating. Use the ACX0032 for positive connections and the ACX0033 for negative and earth connections to form a complete, colour coded battery terminal pair.

Can the ACX0033 be used as a standalone negative earth terminal? Yes. The ACX0033 can be used individually as a standalone negative terminal without being paired with the ACX0032. It is suited as a dedicated earth consolidation point, chassis earth terminal or negative distribution stud in any application requiring a rated, surface mounted negative connection point.

How many cables can be connected to the ACX0033 at once? The ACX0033 features two 3/8 16 thread brass stud terminals, allowing multiple cable lugs to be stacked and connected at the terminal. The practical number of lugs depends on the thread engagement length available after accounting for the thickness of each lug. Ensure all connections are torqued firmly and that the combined current draw of all connected circuits is within the 250A rating.

Is the ACX0033 suitable for outdoor and marine installations? The brass terminal construction and glass filled nylon base provide good corrosion resistance for outdoor and marine applications. For best long term performance in marine environments, use tinned copper cable lugs, apply dielectric grease to all contact surfaces before assembly, and fit the black cap when the terminal is not in use to protect the contact post from moisture and contamination.

Can the ACX0033 be mounted inside the vehicle cabin? Yes. The ACX0033 is designed for use inside or outside the vehicle, making it suited to internal battery box installations, boot mounted battery setups and under seat auxiliary battery locations as well as external engine bay and underbonnet applications. Ensure adequate ventilation if mounting near batteries that may off gas during charging.