OEX ACX3158 250A Dual Stud Distribution Terminal - Black

OEX ACX3158 250A Dual Stud Distribution Terminal Black Two M8 Stainless Steel Studs Glass Filled Nylon Earth and Negative Rail

The OEX ACX3158 is a 250A dual stud distribution terminal in black, providing two M8 stainless steel studs on a single glass filled nylon base for consolidating multiple earth returns or negative circuit feeds at a single rated connection point. The direct negative/earth counterpart to the OEX ACX3157 red dual stud positive terminal. Together they form a complete colour-coded positive and negative distribution terminal pair. Supplied as a single unit. ISO 9001 certified manufacturing. Covered by a one year warranty.

Product overview

Poor earth connections cause a significant proportion of electrical faults, noise issues and intermittent problems in vehicle electrical systems. The ACX3158 provides a dedicated, rated earth termination point where multiple circuit earth cables can be consolidated cleanly onto two separate studs rather than being crammed onto a single chassis bolt or improvised earth point. Two studs offer a practical advantage over single stud solutions large gauge earth cables and smaller circuit earth returns can be separated across the two studs, preventing excessive lug stacking on a single post and keeping the earth distribution point neat, accessible and serviceable.

The 250A continuous rating covers the combined total earth current across both studs, suited to large amplifier earth systems, inverter earth connections, dual battery negative feeds, 4WD multi-accessory earth bars and commercial vehicle auxiliary earth distribution. Glass filled nylon delivers greater rigidity, impact resistance and thermal stability compared to standard nylon, resisting deformation in high-temperature locations including engine bays and equipment enclosures. The M8 stainless steel studs resist corrosion and maintain reliable clamping under vibration, thermal cycling and moisture exposure. ISO 9001 certified manufacturing with in-house testing at OEX's Brisbane facility.

Features and benefits

Two M8 stainless steel studs: Two dedicated earth termination points on a single compact base, allowing large and small gauge earth cables to be separated across two studs and reducing excessive lug stacking.

250A continuous rating: Covers the combined total earth current across both studs, suited to amplifier earth systems, inverter earth connections, dual battery negative feeds and multi-circuit 4WD and commercial vehicle earth bars.

Glass filled nylon base: Greater rigidity, impact resistance and thermal stability than standard nylon. Resists deformation in high-temperature underbonnet and equipment enclosure environments.

Black colour coding: Instant negative/earth rail identification, reducing wiring errors in installations where multiple terminals are mounted in close proximity.

Direct counterpart to ACX3157: The colour-matched negative counterpart to the ACX3157 red dual stud positive terminal, forming a complete professional positive and negative distribution terminal pair.

ISO 9001 certified manufacturing: Produced under ISO 9001 quality management certification with in-house product testing at OEX's Brisbane facility.

One year warranty: Covered by a one year OEX warranty.

Technical specs

Goes well with

OEX ACX3157 250A Dual Stud Distribution Terminal Red (matching positive terminal)

OEX ACX3145BL 250A Single Stud Terminal M8 Red

OEX ACX3056 Ring Crimp Terminal 8.4mm ID Blue (suits M8 stud)

OEX ACX3057 Ring Crimp Terminal 10.5mm ID Blue (suits M8 stud)

Frequently asked questions

What is the difference between the ACX3158 black and the ACX3157 red? The ACX3158 is the black-coded negative/earth variant and the ACX3157 is the red-coded positive variant. Both share identical construction two M8 stainless steel studs, glass filled nylon base and 250A continuous rating. Use the ACX3157 for positive distribution and the ACX3158 for negative/earth distribution to create a clearly colour-coded terminal pair.

Why use a dual stud earth terminal instead of a single chassis bolt? A chassis bolt earth point relies on paint-free metal-to-metal contact that can corrode, loosen and increase resistance over time. The ACX3158 provides a dedicated, rated stainless steel stud designed for cable lug termination, delivering a lower-resistance, more reliable and more serviceable earth connection. Two studs also allow better organisation of multiple earth circuits compared to crowding all lugs onto a single bolt.

What is the total current rating across both studs? The ACX3158 is rated to 250A continuous total across both studs combined. Ensure the combined current draw of all circuits across both studs does not exceed 250A continuous.

What cable lugs are compatible with the M8 studs? The M8 studs accept standard cable lugs with an 8mm hole, available in a range of wire gauge sizes. Always use correctly sized, properly crimped compression lugs matched to the wire gauge of each circuit for secure, low-resistance connections.

Is the ACX3158 suitable for marine and outdoor installations? The M8 stainless steel studs and glass filled nylon base provide good corrosion and moisture resistance suited to marine, outdoor and underbonnet installations. For marine environments, use tinned copper cable lugs and apply dielectric grease to stud and lug contact surfaces before assembly to prevent oxidation and galvanic corrosion.