OEX ACX3146BL 250A Stud Single Terminal - Black

OEX ACX3146BL 250A Single Stud Terminal Black M8 Stainless Steel Stud on Glass Filled Nylon Base

The OEX ACX3146BL is a 250A single stud terminal in black, built around an M8 stainless steel stud mounted on a glass filled nylon base. Designed as a fixed, high-current earth return connection point where multiple ring terminals can be stacked onto the stud and secured with a nut, consolidating multiple negative returns into a single, organised distribution point. The direct earth counterpart to the OEX ACX3145BL red positive terminal. Supplied as a single unit. Covered by a one year warranty.

Product overview

Running individual earth cables from each circuit back to the battery negative terminal or chassis earth creates a crowded, hard-to-service installation. A dedicated earth stud terminal provides a central negative return point where the main earth lead connects to the stud and each circuit connects its own ring terminal, giving each circuit a clean, individually accessible earth connection without running long cables back to the battery.

The 250A rating suits dual battery earth returns, winch negatives, inverter negatives, compressor returns and multi-circuit high-draw loads sharing a common earth rail. The M8 stainless steel stud resists corrosion in underbonnet, marine and caravan environments. The glass filled nylon base provides electrical insulation, mechanical rigidity and heat resistance under sustained load. The black colour follows the standard automotive convention for negative/earth terminals, making the distribution point immediately identifiable. Install alongside the ACX3145BL red positive terminal for a complete, colour-coded positive and negative distribution pair.

Features and benefits

250A rating: Suitable for dual battery earth returns, winch negatives, inverter negatives, compressor returns and multi-circuit high-draw loads sharing a common earth rail.

M8 stainless steel stud: Corrosion-resistant stud accepting standard M8-compatible ring terminals. Provides a secure, torque-resistant connection point for multiple earth cables stacked with a nut.

Glass filled nylon base: Electrically insulating, mechanically robust and heat-resistant. Provides a stable, non-conductive mounting platform for the stud.

Black colour coding: Identifies this as a negative/earth distribution terminal per standard automotive wiring convention, distinguishing it from red positive terminals during installation and servicing.

Pairs with ACX3145BL: Use together with the red M8 positive terminal for a complete, colour-coded positive and negative distribution point side by side.

Single unit: Install individually or alongside the ACX3145BL to build a matched positive and negative distribution pair.

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

Technical specs

Goes well with

OEX ACX3145BL 250A Single Stud Terminal M8 Red (matching positive terminal)

OEX ACX3056 Ring Crimp Terminal 8.4mm ID Blue (suits M8 stud, 1.5 to 2.5mm² cable)

OEX ACX3057 Ring Crimp Terminal 10.5mm ID Blue (suits M8 stud, 1.5 to 2.5mm² cable)

Frequently asked questions

What is a stud terminal used for? A stud terminal provides a fixed, permanent connection point where multiple ring terminals can be stacked onto a single stud and secured with a nut. For earth returns, a stud terminal allows multiple negative cables from different circuits to connect to a single earth point rather than running individual cables all the way back to the battery negative terminal or chassis earth.

What ring terminal size suits the M8 stud? The M8 stud is 8mm in nominal diameter. Ring terminals with an 8.4mm ID or larger will fit over the stud. Suitable OEX options include the ACX3056 (8.4mm ID, blue, 1.5 to 2.5mm²) and ACX3057 (10.5mm ID, blue, 1.5 to 2.5mm²). Always confirm the ring terminal ID matches the stud diameter before purchasing.

How does this differ from the red ACX3145BL? The ACX3146BL is black, indicating a negative/earth terminal per standard automotive convention. The ACX3145BL is red, indicating a positive/power terminal. Both are otherwise identical in specification 250A, M8 stud, glass filled nylon base, stainless steel construction. Used together they provide a matched, colour-coded positive and negative distribution point.

Why is this terminal black? Black is the standard automotive colour convention for negative/earth terminals, distinguishing them from red positive terminals. Colour-coded terminals make it immediately clear which stud is the earth return and which carries positive supply, reducing wiring errors during installation and making future servicing safer.

How many ring terminals can be stacked on one stud? The number of ring terminals that can be stacked depends on the stud's threaded length and the combined thickness of the terminal rings and any washers used. Always ensure the nut has sufficient thread engagement when fully tightened.