Arlington Industries MB5741 No...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$7.75
Arlington Industries MB5741 Non-Metallic Siding Mounting Block

Arlington Industries MB5741 Non-Metallic Siding Mounting Block

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Model: MB5741

In Stock (leaves warehouse same day if ordered before 3pm ET)

$7.75
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Arlington Industries MB5741 Non-Metallic Siding Mounting Block, 5" x 7", White

The Arlington Industries MB5741 is a non-metallic mounting block engineered to give installers a solid, weather-resistant base for mounting electrical boxes and fixtures directly to lap siding. Measuring 5" x 7", this surface-mount block is sized specifically for use with 1/2" lap siding, creating a flat, level surface behind the siding line so boxes stay properly aligned with the siding profile instead of sitting proud or crooked. Molded from durable, non-metallic plastic in a White finish, the MB5741 resists the rust and corrosion that can plague metal mounting hardware in exterior environments, while its White color coordinates cleanly with common siding tones. It is a practical, purpose-built solution for both new construction and renovation projects where exterior electrical devices need a dependable mounting point on 1/2" lap siding.

Key Features

  • Trade Size: 5" x 7" mounting block sized to accommodate standard electrical box and fixture installations on exterior siding.
  • Durable Construction: Non-metallic, plastic construction resists rust and corrosion, providing long-lasting performance in exterior siding applications.
  • Siding Compatibility: Purpose-built for 1/2" lap siding, ensuring a proper fit and a level mounting surface behind the siding line.
  • Surface Mount Design: Mounts directly to the wall surface beneath the siding, simplifying installation of exterior electrical boxes and fixtures.
  • Material Benefit: Lightweight, non-conductive plastic construction stays stable and rust-free where metal mounting blocks would corrode over time.
  • Finish: White color coordinates with common siding tones for a clean, finished exterior appearance.

Technical Specifications

  • Refer to manufacturer documentation for complete specifications.

Typical Applications

  • Exterior Siding Electrical Box Installations
  • Mounting Lights, Receptacles, and Fixtures to Lap Siding
  • New Construction Siding Projects
  • Renovation and Retrofit Siding Installations
  • Weatherproof Backing for Exterior Electrical Devices

Why Arlington Industries?

Arlington Industries builds electrical mounting products engineered to solve real installation challenges, and the MB5741 non-metallic mounting block is no exception. Its plastic, non-metallic construction and siding-specific 5" x 7" sizing for 1/2" lap siding give installers a reliable way to mount electrical boxes flush and level against exterior siding, without the corrosion concerns of metal alternatives. For professionals and homeowners seeking a purpose-built, corrosion-resistant mounting solution for lap siding, the Arlington Industries MB5741 delivers dependable, practical performance for exterior electrical installations.

Manufacturer Resources

Product Specs

Product Type:
Mounting Block
Department:
Electrical
Product Group:
Hangers, Supports & Fasteners
Product Subgroup:
Mounting Hardware
list_batch:
ARL-20260918

Arlington Industries MB5741 – Frequently Asked Questions

1) What size lap siding does the Arlington MB5741 mounting block fit?
The MB5741 is built for 1/2 inch lap siding. If your siding is 5/8 inch lap, order the MB5751 instead, which is the same 5 x 7 inch block sized for that thicker profile. Matching the block to the siding thickness is what keeps the mounted box flat and level against the siding line instead of sitting proud or cocked.
2) Difference between Arlington MB5741 and MB5751?
Siding thickness is the only difference. MB5741 is the 1/2 inch version and MB5751 is the 5/8 inch version. Both are non-metallic 5 x 7 inch surface mount blocks in White. Measure the lap of the existing siding before you pick one, because ordering the wrong thickness leaves the block either loose against the wall or standing off the siding.
3) Will a 5 x 7 mounting block hold an exterior light or receptacle box on siding?
Yes. The 5 x 7 inch face is sized to take standard exterior electrical boxes and fixtures, and it gives you a flat, level pad on an otherwise sloped siding surface so the box seats square. Typical uses are exterior receptacles, wall lights, and weatherproof device boxes on lap siding.
4) Is the Arlington siding mounting block plastic or metal, and will it rust outside?
It is molded non-metallic plastic, so there is nothing to rust or corrode in an exterior wall application. That also makes it non-conductive, unlike a metal mounting plate. Finish is White, which blends with most common siding colors.
5) How do I order the Arlington non-metallic siding mounting block by part number?
Two part numbers cover it: MB5741 for 1/2 inch lap siding and MB5751 for 5/8 inch lap siding. Size is the only option to specify; both are White non-metallic 5 x 7 inch blocks.
6) Can I use this mounting block on an existing house, or is it only for new siding work?
Both. It surface mounts to the wall beneath the siding, so it works on new construction siding runs and on renovation or retrofit jobs where an exterior device needs a solid backing on siding that is already up.
How fast can I get the Arlington Industries MB5741 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Arlington Industries MB5741 come with a warranty?
Absolutely. The Arlington Industries MB5741 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Arlington Industries MB5741?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Arlington Industries MB5741 from ZenSupply?
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