Kaba Ilco CRTK Classroom Turnk...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$30.47
Kaba Ilco Kaba Ilco Classroom Turnknob Mortise Cylinders ILC-CRTK

Kaba Ilco CRTK Classroom Turnknob Mortise Cylinders with Rotation-Limited Field Handing

(No reviews yet) Write a Review

Model: 4137-TK-1-26D
$30.47
Selected Finish is
Selected Cams is

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

$30.47
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

Kaba Ilco CRTK Classroom Turnknob Mortise Cylinders with Rotation-Limited Field Handing

The Kaba Ilco CRTK Classroom Turnknob Mortise Cylinders are part of the Ilco Brass Mortise Cylinder line, a broad selection designed to cover numerous commercial door hardware applications. This mortise cylinder features rotation-limited, field-handing operation and is available in 11 finishes, 2 cam styles, and 4 lengths, giving installers the flexibility to match a wide range of door and hardware configurations. Built in brass, these classroom turnknob cylinders support reliable, field-adjustable key control for commercial and institutional door openings where classroom function operation is required.

Key Features

  • Classroom Turnknob Function: Configured as a classroom turnknob mortise cylinder for controlled access door openings in commercial and institutional settings.
  • Rotation-Limited Field Handing: Rotation limited design allows the cylinder to be field handed on site for flexible installation across door configurations.
  • Brass Construction: Part of the Ilco Brass Mortise Cylinder line, offering broad coverage for numerous commercial applications.
  • 11 Finish Options: Available in Bright Brass, Satin Brass, Antique Brass, Satin Bronze, Oil Rubbed Bronze, Satin Nickel, Bright Chrome, Satin Chrome, Black Aluminum, Bright Stainless Steel, and Satin Stainless Steel to coordinate with existing door hardware finishes.
  • 2 Cam Styles: Offered with 2 cam options to support compatibility with different mortise lock housings.
  • 4 Cylinder Lengths: Available in 4 lengths to accommodate varying door thickness and mortise housing requirements.

Technical Specifications

  • Product Group: Parts and Accessories
  • Commercial/Residential: Commercial
  • Parts and Accessories Type: Replacement Parts
  • Product Attribute: Parts and Accessories
  • Product Category: Parts and Accessories

Typical Applications

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

Why Kaba Ilco CRTK?

Kaba Ilco mortise cylinder products are built from brass construction and offered across 11 finishes, 2 cam styles, and 4 lengths to cover numerous commercial applications. The rotation-limited, field-handing design gives installers flexible, reliable key control for classroom function doors, backed by the broad coverage of the Ilco Brass Mortise Cylinder line across commercial and institutional projects.

Product Specs

Product Group:
Parts and Accessories
Product Subgroup:
Cylinders
Product Type:
Mortise Cylinders
Subcategory:
Cylinders
Commercial/Residential:
Commercial
Lock Type:
Mortise
Handle Type:
Knob
Lock Function:
Classroom
Parts and Accessories Type:
Replacement Parts
Product Attribute:
Parts and Accessories
Product Function:
Classroom
Product Category:
Parts and Accessories
Department:
Door Hardware

Kaba Ilco 4137-TK-1-26D – Frequently Asked Questions

1) What is a classroom turnknob mortise cylinder actually for, and where does it get used?
It's the cylinder half of a classroom-function mortise setup, with a turnknob instead of a key on one side. Kaba Ilco's classroom turnknob mortise cylinders are commercial-rated door hardware, sold as a replacement part, so you're buying them to re-key or re-finish an existing mortise lock or storefront device rather than as a complete lockset. The knob side lets someone secure or release the function by hand without a key; the other side takes the key.
2) What cylinder lengths does the Kaba Ilco classroom turnknob mortise cylinder come in?
Four lengths: 1 inch, 1-1/8 inch, 1-1/4 inch and 1-5/16 inch. Measure the cylinder you're pulling out, from the face of the shell to the back where the cam sits, and match it. Too short and the cylinder sits below the trim ring; too long and it stands proud of the face and can bind against the trim.
3) Do I need the Adams Rite cam or the standard cam on this Ilco mortise cylinder?
Two cams are offered, standard and Adams Rite. If the cylinder is going into an aluminum storefront door with an Adams Rite style deadlatch or deadbolt, take the Adams Rite cam. If it's going into a conventional hollow metal or wood door mortise lock body, take the standard cam. The cam is the tailpiece that actually drives the lock, so the wrong one threads in fine and then does nothing.
4) Does the turnknob have to be ordered left or right hand?
No handing to specify. The Ilco classroom turnknob mortise cylinder is rotation limited and field handed, so the same part covers either hand and you set it at install. That matters if you're stocking a truck or standardizing across a building: one part number covers both sides of a pair.
5) Will this Ilco cylinder go into an aluminum storefront door?
Yes, if you order the Adams Rite cam. That's the cam pattern storefront deadlatches and hook bolts use. Match the length to the existing cylinder as well, choosing from 1, 1-1/8, 1-1/4 or 1-5/16 inch, since storefront stiles are shallow and an overlong cylinder will sit outside the face.
6) Can I just replace the cylinder instead of the whole mortise lock?
That's what these are for. Ilco brass mortise cylinders are sold as replacement parts, so if the lock body still works and you only need to re-key, change the keyway, or change the finish, you pull the cylinder and thread a new one in. You need three things to match: the length, the cam (standard or Adams Rite), and the finish.
7) Is this a full classroom lockset or just the cylinder?
Just the cylinder. It's the mortise cylinder with a turnknob, not a lock body, not trim, not a strike. If you're building a classroom opening from scratch you still need the mortise lock case and trim; if you're repairing or re-keying one that already exists, this is the part you want.
8) What finishes can I get the Ilco classroom turnknob mortise cylinder in to match the rest of my doors?
Eleven finishes: bright brass, satin brass, antique brass, satin bronze, oil rubbed bronze, satin nickel, bright chrome, satin chrome, black aluminum, bright stainless steel and satin stainless steel. That spread covers both the brass-family and the chrome/stainless-family openings in most buildings, so a property manager replacing cylinders across a mixed fleet can usually match what's already hanging rather than re-doing whole doors.
9) I'm standardizing cylinders across a campus. How many combinations does the Ilco classroom turnknob line cover?
Four lengths, two cams and eleven finishes, which is a broad enough grid to cover both the storefront entrances and the interior mortise locks in one order from one brand. For an institutional buyer that's the point of the line: pick the finish standard for the facility, then vary only length and cam by opening.
How fast can I get the Kaba Ilco 4137-TK-1-26D 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 Kaba Ilco 4137-TK-1-26D come with a warranty?
Absolutely. The Kaba Ilco 4137-TK-1-26D 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 Kaba Ilco 4137-TK-1-26D?
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 Kaba Ilco 4137-TK-1-26D 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.
!