OEX ACX0033 Stud Single Terminal - Black

OEX ACX0033 Stud Single Terminal - Black

Complete your battery terminal setup with the OEX ACX0033 Stud Single Terminal — featuring a grooved brass contact post 28.8mm long, 20.6mm diameter stud with brass hex nut and lock washer, two 3/8-16 thread brass stud terminals, 250A power rating, glass-filled nylon base for strength and heat resistance, black cap for negative rail identification, and flexible installation for use inside or outside the vehicle individually as a negative terminal or in pairs with the red ACX0032 as a complete positive and negative battery terminal set.

Product Overview

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 that can be positioned at a more accessible location away from the battery post. Together, the ACX0032 and ACX0033 form a matched, colour-coded positive and negative battery terminal pair  the professional solution for relocated battery installations, battery box builds, auxiliary battery setups, dual battery systems, and custom electrical builds where a clean, accessible, and clearly identified positive and negative terminal pair is required. The ACX0033 shares the same robust construction as the ACX0032 grooved brass contact post for reliable low-resistance contact, dual 3/8-16 thread brass stud terminals for multiple cable connections, brass hex nut and lock washer for vibration-resistant clamping, and glass-filled nylon base for superior heat and impact resistance. The 250A power rating provides substantial capacity for demanding negative/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. Suitable for installation inside or outside the vehicle, the ACX0033 suits battery boxes, engine bays, under-bonnet electrical panels, boot-mounted auxiliary systems, and marine battery compartments. ISO 9001-certified manufacturing and in-house testing at OEX's Brisbane facility ensures consistent quality and long-term reliability.

Features & Benefits

Grooved Brass Contact Post for Reliable Low-Resistance Connection: The 28.8mm long grooved brass contact post provides excellent electrical conductivity and secure mechanical engagement with cable lugs — the grooved profile prevents lug rotation during tightening, maintaining proper alignment and consistent contact pressure for a reliable, low-resistance negative connection.

Two 3/8-16 Thread Brass Stud Terminals for Multiple Connections: Dual 3/8-16 thread brass stud terminals allow multiple earth cables and negative circuits to be connected at the same terminal point ideal for consolidating 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/earth current of multiple high-current circuits simultaneously — suitable for large inverter earth connections, high-powered amplifier earth systems, dual battery negative feeds, 4WD multi-accessory earth consolidation, and commercial vehicle auxiliary earth distribution.

20.6mm Diameter Stud with Brass Hex Nut and Lock Washer: The substantial 20.6mm stud diameter provides a large, robust connection platform, while the brass hex nut and lock washer combination ensures connections remain secure under vibration, mechanical shock, and thermal cycling common in mobile vehicle applications.

Relocatable to More Accessible Locations: Designed for battery connections at more accessible locations, the ACX0033 enables negative terminal connections to be positioned at battery boxes, custom panels, bulkheads, and auxiliary battery locations — making negative distribution clean, organised, and professionally presented.

Glass-Filled Nylon Base for Superior Strength and Heat Resistance: Glass-filled nylon construction provides significantly greater rigidity, impact resistance, and thermal stability compared to standard nylon, resisting deformation and cracking under sustained load and elevated temperatures in engine bays, battery compartments, and under-bonnet environments.

Black Cap for Negative Terminal Identification: The black protective cap provides instant identification as the negative terminal in any installation, meeting the standard colour-coding convention for negative battery connections and reducing wiring errors in complex multi-terminal electrical builds.

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

Technical Specs

Compatible With / Goes Well With

The OEX ACX0033 suits 12V and 24V automotive, marine, caravan, RV, 4WD, and commercial vehicle battery installations requiring a reliable 250A-rated negative terminal connection point at a relocated or more accessible location. Ideal for battery box installations, auxiliary battery setups, dual battery systems, boot-mounted battery builds, marine battery compartments, and custom electrical panels. 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/earth variant and the ACX0032 is the red-coded positive variant. Both share identical physical construction — grooved brass contact post, dual 3/8-16 thread stud terminals, 20.6mm stud diameter, and glass-filled nylon base. The key difference is the ACX0033 has a confirmed 250A power rating in the product specification. Use the ACX0032 for positive connections and the ACX0033 for negative/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 needing to be paired with the ACX0032. It is equally suitable 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 to be used inside or outside the vehicle, making it suitable for internal battery box installations, boot-mounted battery setups, and under-seat auxiliary battery locations as well as external engine bay and under-bonnet applications. Ensure adequate ventilation if mounting near batteries that may off-gas during charging.