Cal-Royal CR4243 3-1/2" Wide S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$24.11
Cal-Royal CR4243 3-1/2" Wide Sill Nosing for Threshold Extension

Cal-Royal CR4243 3-1/2" Wide Sill Nosing for Threshold Extension

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Model: CR424336-ALUM
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$24.11
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Cal-Royal CR4243 3-1/2" Wide Sill Nosing for Threshold Extension

The Cal-Royal CR4243 is a 3-1/2" wide sill nosing designed to extend the nose of a door threshold, providing added coverage, protection, and a finished aesthetic appearance for the step or slab located in front of the threshold. This sill nosing is furnished undrilled and without screws, allowing installers to customize hole placement to suit the specific application and existing threshold configuration. Ideal for commercial door assemblies, the CR4243 is part of Cal-Royal's Door Trim and Accessories line within the Door Thresholds subgroup, engineered to complement existing threshold installations with a durable, low-profile design.

Key Features

  • Threshold Extension Design: 3-1/2" wide profile extends the nose of the threshold to provide additional coverage at the step or slab.
  • Protective Function: Serves as a protective cover for the step or slab area directly in front of the threshold, helping to guard against wear and damage.
  • Aesthetic Finish: Provides a clean, finished appearance where the threshold meets the step or slab, improving the overall look of the entryway.
  • Undrilled Construction: Furnished undrilled and without screws, giving installers flexibility to drill mounting holes according to the specific job requirements.
  • Commercial-Grade Application: Designed for use in commercial door and threshold assemblies as part of a complete entryway system.
  • Compatible Accessory: Functions as a companion component to Cal-Royal threshold products, integrating with existing Door Thresholds hardware for a complete installation.

Technical Specifications

  • Subcategory: Thresholds
  • Product Group: Door Trim and Accessories
  • Product Subgroup: Door Thresholds
  • Product Type: Sill Nosing
  • Commercial/Residential: Commercial
  • Product Model: CR4243
  • Product Category: Door Trim and Accessories
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Cal-Royal CR4243?

Cal-Royal door trim and accessory products are built to deliver dependable, functional performance as part of a complete threshold assembly. The CR4243 sill nosing is designed specifically to protect and enhance the area in front of a threshold, offering commercial-grade construction suited for demanding entryway applications. Choosing this sill nosing ensures a coordinated, finished look while extending the protective coverage of your existing threshold system.

Product Specs

Subcategory:
Thresholds
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Sill Nosing
Commercial/Residential:
Commercial
Product Model:
CR4243
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Cal-Royal CR424336-ALUM – Frequently Asked Questions

1) What is a sill nosing like the Cal-Royal CR4243 actually for, and do I need one with my threshold?
A sill nosing is a separate trim piece that extends the nose of an existing door threshold out over the step or slab in front of it. The CR4243 is 3-1/2 inches wide, so it covers that strip of concrete where the threshold ends and the step begins. You need one when the slab in front of the threshold is chipped, uneven, or exposed to traffic and weather, or when you want a finished edge instead of a raw concrete lip. It is a companion piece, not a threshold itself, so it does not replace or seal the opening on its own.
2) Does the Cal-Royal CR4243 sill nosing come with screws or pre-drilled holes?
No. The CR4243 ships undrilled and without screws. You drill the mounting holes on site to line up with your existing threshold and slab, and you supply your own fasteners, typically concrete anchors sized to the substrate you are fixing into. Plan for that on the job list, because the part arrives as bare extrusion.
3) What lengths does the Cal-Royal CR4243 sill nosing come in for a double door or a wide opening?
Four lengths: 36, 48, 72, and 96 inches. A 36 inch piece covers a single standard door leaf. For a pair of doors, or an opening with sidelites, the 72 or 96 inch length lets you run one continuous piece across the whole sill instead of butting two shorter sections, which avoids a seam sitting in the traffic path. Since the nosing is undrilled, you can cut a longer piece down to the exact sill width you measured.
4) Can I use the CR4243 sill nosing instead of replacing a worn threshold?
No, and this is the most common mix-up. The CR4243 is a nosing, a trim extension that sits in front of the threshold and covers the step or slab. It has no seal, no ramp for the door to close against, and it does not span the opening under the door. If the threshold itself is worn out, buy a replacement threshold. Use the nosing when the threshold is sound but the concrete in front of it is deteriorating or looks unfinished.
5) What finishes does the Cal-Royal CR4243 sill nosing come in, and which one matches my existing threshold?
Two finishes, mill aluminum and duronodic. Mill aluminum is the bright silver finish that matches most standard aluminum thresholds and aluminum storefront framing. Duronodic is the dark bronze anodized finish, which is what you want if the existing threshold and door frames are bronze. Both finishes are offered in all four lengths, 36, 48, 72, and 96 inches. Match the nosing to the threshold already in the opening, not to the door, since the two pieces sit edge to edge and any mismatch shows.
6) I have a Cal-Royal threshold already installed. Will the CR4243 work with it?
Yes. The CR4243 is made as a companion piece to Cal-Royal threshold products and is meant to integrate with an existing threshold installation. Since it is furnished undrilled, hole placement is yours to set, so it adapts to the anchor pattern already in your threshold rather than forcing a fixed spacing.
7) Is the Cal-Royal CR4243 sill nosing rated for commercial traffic in a school or hospital entrance?
The CR4243 is specified as a commercial product, intended for commercial door and threshold assemblies rather than residential entries. Cal-Royal calls out office buildings, schools, healthcare facilities, retail, industrial and warehouse buildings, multi-tenant residential and government buildings as the typical applications. For a high traffic institutional entrance, the point of the nosing is to take the wear at the sill edge instead of letting foot traffic and carts chew up the concrete.
8) I need to standardize sill nosing across a building with different door widths. Can I order one length and cut it?
Yes, and that is the practical way to do it on a fleet of openings. The CR4243 comes in 36, 48, 72, and 96 inch lengths in both mill aluminum and duronodic, and it is supplied undrilled, so a 96 inch stick can be cut down to whatever each opening measures without wasting a factory-drilled pattern. Pick the finish once, aluminum or duronodic, and every opening matches.
How fast can I get the Cal-Royal CR424336-ALUM 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 Cal-Royal CR424336-ALUM come with a warranty?
Absolutely. The Cal-Royal CR424336-ALUM 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 Cal-Royal CR424336-ALUM?
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 Cal-Royal CR424336-ALUM 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.
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