Arlington Industries SP363 Sil...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,087.81
Arlington Industries SP363 Sill Plate, 1-1/4" EMT & 2/3" SEU, with Duct Seal & Wood Screws, Pack of 100

Arlington Industries SP363 Sill Plate, 1-1/4" EMT & 2/3" SEU, with Duct Seal & Wood Screws, Pack of 100

(No reviews yet) Write a Review

Model: SP363

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

$1,087.81
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Arlington Industries SP363 Sill Plate, 1-1/4" EMT & 2/3" SEU, with Duct Seal & Wood Screws

The Arlington Industries SP363 sill plate is designed to provide a clean, finished, and sealed wall or sill penetration for electrical service entrances that combine 1-1/4" EMT conduit with 2/3" SEU service entrance cable. Rather than sourcing conduit hardware, cable hardware, sealant, and mounting screws separately, the SP363 ships as a complete kit that includes duct seal and wood screws, so installers can mount the plate and pack the penetration in a single step. The sill plate is intended for exterior wall or sill entries where EMT conduit and SEU cable pass through the structure to reach a meter base, panel, or service equipment. By combining both the conduit and cable openings into one plate, the SP363 simplifies service entrance installations on residential and light commercial projects.

Key Features

  • EMT Trade Size: Sized for 1-1/4" EMT conduit entry through the sill plate.
  • SEU Cable Size: Accommodates 2/3" SEU service entrance cable through the same sill plate.
  • Dual-Entry Sill Plate: Combines the EMT conduit and SEU cable openings into a single sill plate for one clean penetration point instead of two separate fittings.
  • Includes Duct Seal: Duct seal compound ships with the plate so installers can pack around the conduit and cable for an air- and moisture-resistant seal at the entry point.
  • Includes Wood Screws: Mounting wood screws are included, giving installers a complete, ready-to-install kit without sourcing separate hardware.
  • Finished Appearance: The sill plate provides a uniform, finished cover at the wall or sill where conduit and cable enter the structure.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Service Entrance Cable (SEU) Wall and Sill Entries
  • EMT Conduit Wall and Sill Penetrations
  • Residential Electrical Service Entrance Installations
  • Light Commercial Electrical Service Installations
  • New Construction and Retrofit Sill Sealing Projects

Why Arlington Industries?

Arlington Industries builds the SP363 sill plate as a complete, ready-to-install kit, pairing a dual-entry plate sized for 1-1/4" EMT conduit and 2/3" SEU cable with the duct seal and wood screws needed to finish the job. Supplying both the sealing compound and mounting hardware in one package helps installers standardize service entrance penetrations and avoid last-minute hardware runs. For electricians who need a dependable, purpose-built way to seal EMT and SEU entries at the sill, the SP363 delivers a complete solution from Arlington Industries.

Manufacturer Resources

Product Specs

list_batch:
ARL-20260918
Product Type:
Sill Plate
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Service Entrance Fittings
Product Size:
1-1/4"
Pack size (unit):
100
Product Height:
2.625 in
Product Width:
3.812 in
Country Of Origin:
United States
Wire Size:
1-1/4 EMT & 2/3 SEU
Product Color:
Silver

Arlington Industries SP363 – Frequently Asked Questions

1) Will the Arlington SP363 sill plate work for a 1-1/4 inch EMT conduit and SEU cable coming through the same wall?
That is exactly what the SP363 is built for. It is a dual-entry sill plate with one opening sized for 1-1/4 inch EMT conduit and a second for 2/3 SEU service entrance cable, so both pass through a single penetration point instead of two separate fittings. If your service runs a different EMT trade size or a different SEU conductor size, this is the wrong plate.
2) Does the Arlington SP363 come with the duct seal and screws, or do I have to buy those separately?
The kit ships complete. Duct seal compound for packing around the conduit and cable is in the package, and the wood screws for mounting the plate are included too. You can set the plate and seal the penetration in one trip without sourcing sealant or fasteners separately.
3) How many Arlington SP363 sill plates are in a box?
The SP363 is packaged 100 to a pack, each one a complete kit with its own duct seal and wood screws. That is a bulk quantity aimed at service crews and supply houses standardizing service entrance penetrations, not a one-off replacement purchase.
4) What is a sill plate used for on an electrical service entrance?
It covers and seals the spot where conduit and service cable pass through the exterior wall or sill on the way to a meter base, panel, or service equipment. The Arlington SP363 does two jobs at once: it gives a uniform finished cover at the penetration, and the included duct seal packs around the 1-1/4 inch EMT and the 2/3 SEU cable to resist air and moisture entry.
5) Can I use the Arlington SP363 on a commercial job or is it residential only?
Both. Arlington lists the SP363 for residential and light commercial electrical service entrance work, on new construction and on retrofit sill sealing. What limits it is not the building type but the conductor sizes: the openings are cut for 1-1/4 inch EMT and 2/3 SEU, so a heavier commercial service will need different hardware.
6) Do I need to mount the SP363 into wood, or will it work on masonry?
The fasteners supplied are wood screws, so the SP363 is set up out of the box for a wood sill or wood-framed sided wall. On brick, block, or stucco you will need to supply your own masonry anchors; the plate itself still seals the penetration the same way with the included duct seal.
7) What is the manufacturer part number for the Arlington sill plate that takes 1-1/4 inch EMT and 2/3 SEU?
Arlington Industries part number SP363. One model, no finish or size options to specify, supplied in packs of 100 with duct seal and wood screws included.
How fast can I get the Arlington Industries SP363 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 SP363 come with a warranty?
Absolutely. The Arlington Industries SP363 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 SP363?
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 SP363 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!