Description
OEX ACX0035 Single Firewall Bulkhead Stud
Route high-current cables cleanly and safely through firewalls and bulkheads with the OEX ACX0035 Single Firewall Bulkhead Stud, featuring two 3/8-16 thread brass stud terminals, 250A continuous rating, 48V DC maximum operating voltage, impact-resistant plastic insulator and mounting bush, stainless nuts, 10mm brass bolts, a compact 15.9mm length, and a 32mm diameter mounting hole for clean, professional cable pass-through in automotive, marine, 4WD, caravan, RV, and commercial vehicle electrical installations.
Product Overview
The OEX ACX0035 is a single firewall bulkhead stud designed to provide a clean, insulated, and rated cable pass-through point for routing high-current positive or negative cables through metal firewalls, bulkheads, chassis rails, battery enclosure walls, and custom electrical panels. In professional automotive and marine electrical builds, passing a bare cable through a hole in a metal panel creates a significant risk of cable chafing, insulation damage, and short circuits where the cable contacts the sharp panel edge. The ACX0035 eliminates this risk by providing an insulated, panel-mounted stud terminal that separates the cable connection point from the metal panel surface, with the impact-resistant plastic insulator and mounting bush providing full electrical isolation between the stud and the surrounding metalwork. The dual 3/8-16 thread brass stud terminals allow cables to be connected on both sides of the firewall or bulkhead, creating a secure, rated electrical connection point that passes current through the panel without any bare cable penetrating the metal. This is particularly important in engine bay to cabin builds, battery box to accessory panel wiring, marine bulkhead cable routing, and any installation where a high-current cable needs to cross a metal barrier cleanly and safely. The 32mm diameter mounting hole suits standard hole saw sizes available at most hardware stores, making installation straightforward without specialist tooling. Rated to 250A continuous and 48V DC maximum, the ACX0035 handles the demands of high-current 12V and 24V automotive and marine electrical systems including large inverters, amplifier main feeds, dual battery cables, and commercial vehicle auxiliary circuits. The compact 15.9mm body length suits typical automotive panel thicknesses without excessive protrusion on either side. ISO 9001-certified manufacturing and in-house testing at OEX's Brisbane facility ensures consistent quality and long-term reliability.
Features & Benefits
Clean Insulated Cable Pass-Through for Firewalls and Bulkheads: Provides a fully insulated, panel-mounted terminal point for routing high-current cables through metal firewalls and bulkheads, eliminating the risk of cable chafing, insulation damage, and short circuits where bare cables contact sharp metal panel edges in professional electrical builds.
Impact-Resistant Plastic Insulator and Mounting Bush: The impact-resistant plastic insulator and mounting bush provide full electrical isolation between the stud terminals and the surrounding metalwork, ensuring no continuity between the live stud and the vehicle chassis or panel regardless of installation location or vibration.
250A Continuous / 48V DC Rating: Rated to 250A continuous and 48V DC maximum, the ACX0035 handles the high current demands of large inverter feeds, amplifier main power cables, dual battery runs, and commercial vehicle auxiliary circuits in both 12V and 24V electrical systems.
2 x 3/8-16 Thread Brass Stud Terminals: Dual 3/8-16 thread brass stud terminals on both sides of the panel allow cables to be terminated cleanly on the engine bay side and the cabin side, creating a secure, rated connection point that passes current through the panel without bare cable penetration.
Stainless Nuts and 10mm Brass Bolts for Reliable Connections: Stainless steel nuts combined with 10mm brass bolts provide corrosion-resistant, vibration-resistant clamping at both connection points, maintaining reliable electrical contact under the thermal cycling and mechanical vibration common in automotive and marine installations.
32mm Diameter Mounting Hole for Standard Tooling: The 32mm mounting hole suits standard hole saw sizes readily available at hardware stores, making installation straightforward without specialist tooling and ensuring a clean, professional finish on the panel surface.
Compact 15.9mm Body Length for Neat Installation: The short 15.9mm body length suits standard automotive panel thicknesses, minimising protrusion on both sides of the firewall or bulkhead for a neat, low-profile installation that does not interfere with surrounding components.
ISO 9001 Certified Manufacturing: Produced under ISO 9001 quality management certification with in-house product testing at OEX's Brisbane facility, ensuring consistent quality and long-term reliability across automotive, marine, RV, mining, and commercial vehicle applications.
Technical Specs
| Specification |
Details |
| Part Number |
ACX0035 |
| Brand |
OEX |
| Type |
Single Firewall Bulkhead Stud |
| Max Operating Voltage |
48V DC |
| Continuous Rating |
250A |
| Stud Terminals |
2 x 3/8-16 Thread Brass |
| Nuts |
Stainless Steel |
| Bolts |
10mm Brass |
| Insulator / Mounting Bush |
Impact-Resistant Plastic |
| Body Length |
15.9mm |
| Mounting Hole Diameter |
32mm |
| Warranty |
1 Year |
| Quality Certification |
ISO 9001 |
Compatible With / Goes Well With
The OEX ACX0035 suits 12V and 24V automotive, marine, caravan, RV, 4WD, commercial vehicle, and mining support vehicle applications requiring a clean, insulated, 250A-rated cable pass-through point through metal firewalls, bulkheads, chassis rails, battery box walls, and custom electrical panels. Ideal for engine bay to cabin positive cable routing, battery box to accessory panel wiring, marine bulkhead cable pass-through, and any installation where a high-current cable needs to cross a metal barrier safely. Compatible with standard cable lugs for 3/8-16 thread studs across a range of heavy gauge wire sizes. Pairs with OEX battery terminals, distribution blocks, ANL fuse holders, and bulkhead connector accessories for a complete professional wiring solution.
Frequently Asked Questions
What is a firewall bulkhead stud and why is it needed?
A firewall bulkhead stud provides an insulated, panel-mounted terminal point for routing high-current cables through metal panels such as firewalls and bulkheads. Without a bulkhead stud, a bare cable passing through a hole in a metal panel risks chafing against the sharp edge, damaging the insulation, and causing a short circuit to the chassis. The ACX0035 eliminates this risk by providing an insulated pass-through terminal that isolates the live conductor from the surrounding metalwork at the panel penetration point.
Can the ACX0035 be used for both positive and negative cables?
Yes. The ACX0035 is a single bulkhead stud suitable for either a positive or negative cable pass-through. For installations requiring both positive and negative cables to pass through the same panel, two ACX0035 units should be installed side by side with adequate separation between them to prevent accidental contact between the two live terminals.
What size hole saw is needed to install the ACX0035?
The ACX0035 requires a 32mm diameter mounting hole, which suits a standard 32mm hole saw available at most hardware stores. Drill the hole in the centre of the intended mounting location, deburr the edges thoroughly, and test-fit the mounting bush before final installation.
What cable lugs are compatible with the 3/8-16 thread studs?
The 3/8-16 thread brass studs accept standard cable lugs with a 3/8" hole, available across a range of wire gauge sizes from light accessory wire through to heavy gauge cables used in 250A-rated automotive and marine applications. Always use correctly sized, properly crimped compression lugs matched to the wire gauge of each circuit.
Is the ACX0035 suitable for marine bulkhead installations?
The brass stud construction and impact-resistant plastic insulator provide good corrosion resistance and electrical isolation suitable for marine bulkhead applications. For best long-term performance in marine environments, apply marine-grade sealant around the mounting bush perimeter during installation to prevent water ingress through the panel hole, and use tinned copper cable lugs with dielectric grease on all contact surfaces.
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