Kaba Ilco 4015 Series Threshol...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$35.67
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Kaba Ilco 4015 Series Threshold Bolt with Two Point Locking for Double Doors

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Model: THB-4015

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

$35.67
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Kaba Ilco 4015 Series Threshold Bolt with Two Point Locking for Double Doors

The Kaba Ilco 4015 Series Threshold Bolt is a two point lock that enhances the security of double door installations. When the deadbolt is actuated, the bolt extends into the threshold, and three point locking is achieved when this threshold bolt is used in conjunction with a header bolt. The bolt offers an 11/16" (17.45 mm) throw and a 34" (863.6 mm) cylinder height, with a zinc plated steel rod built for reliable performance on commercial door openings.

Key Features

  • Throw: 11/16" (17.45 mm) throw extends the bolt into the threshold for secure two point locking on double door openings.
  • Cylinder Height: 34" (863.6 mm) cylinder height is sized for standard double door installations.
  • Zinc Plated Steel Rod: The rod is zinc plated steel, supporting consistent, long term operation on commercial doors.
  • Pivoting Deadbolt Attachment: Attaches to the rear of the pivoting deadbolt for integrated threshold locking action.
  • Easy Retrofit: Easily added to an existing installation without extensive door or frame modification.
  • Three Point Locking Compatibility: When used in conjunction with a header bolt, this threshold bolt helps achieve three point locking for enhanced double door security.

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Surface Bolts
  • Subcategory: Flush Bolts
  • Commercial/Residential: Commercial
  • Product Category: Door Trim and Accessories
  • Throw: 11/16" (17.45 mm)
  • Cylinder Height: 34" (863.6 mm)

Typical Applications

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

Why Kaba Ilco 4015?

Kaba Ilco 4015 Series hardware is built with a zinc plated steel rod and a pivoting deadbolt attachment designed for dependable, long term use on commercial double door openings. With an 11/16" throw and 34" cylinder height, it is engineered to add secure two point locking to an existing installation, and when paired with a header bolt it helps deliver the three point locking commercial applications depend on for consistent, professional grade security.

Product Specs

Product Group:
Door Trim and Accessories
Series:
4015 Series
Product Subgroup:
Surface Bolts
Product Type:
Threshold Bolt
Subcategory:
Flush Bolts
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Kaba Ilco THB-4015 – Frequently Asked Questions

1) How does the Kaba Ilco 4015 threshold bolt lock a pair of doors without a mullion?
The THB-4015 is a two-point lock for double door openings. It mounts to the rear of a pivoting deadbolt, so when you throw the deadbolt the bolt drops down into the threshold at the same time. That gives you a bolt into the frame and a bolt into the floor off one key throw. Add a header bolt to the same deadbolt and you get three-point locking, top and bottom plus the deadbolt itself.
2) Will an 11/16 inch bolt throw be enough to engage the floor strike on a storefront threshold?
The 4015 threshold bolt throws 11/16 inch (17.45 mm) into the threshold. That is a short drop, so the strike hole has to sit directly under the bolt in the threshold itself, not in a recessed floor below it. If your existing bottom strike is deeper than that, or the door has a large undercut over a finished floor, the bolt will not pick it up.
3) Can I add a threshold bolt to double doors that are already installed, or does it have to be ordered with the deadbolt?
It retrofits. The 4015 threshold bolt attaches to the rear of an existing pivoting deadbolt, so you can add it to a door already hung and keyed rather than replacing the lock. You are drilling for the bolt in the threshold and running the rod, not re-prepping the stile.
4) What is the rod length on the Ilco 4015 threshold bolt and will it reach on my door?
The rod runs from the deadbolt down to the threshold at a 34 inch (863.6 mm) cylinder height. That is the height the bolt is built around, so it suits a standard storefront door with the deadbolt at typical lock height. On a door where the deadbolt sits materially higher or lower than 34 inches off the threshold, the geometry will not line up.
5) Should I use a threshold bolt or a header bolt on my double doors?
They do opposite ends of the same job. The threshold bolt drives down into the threshold; the header bolt drives up into the head. Either one on its own, paired with the deadbolt, gives you two-point locking on the inactive leaf. Run both off the same pivoting deadbolt and you have three-point locking, head and floor and frame. If the opening only needs one, pick the end where the door has the most play.
6) Do I still need a flush bolt if I install a threshold bolt?
No, the threshold bolt does that job off the deadbolt instead. A conventional flush bolt is thrown by hand at the edge of the inactive leaf; the 4015 bolts into the threshold automatically when the pivoting deadbolt is actuated, so there is no separate lever to remember. What it does not do is secure the head, and for that you would add a header bolt to the same deadbolt.
7) What model do I order for the Kaba Ilco 4015 threshold bolt?
One model covers it: THB-4015. There is no handing, finish, or length to specify on the bolt itself. What you do need to confirm is that the door carries a pivoting deadbolt for it to attach to, and if you want three-point locking you order a header bolt alongside it.
8) Is the Ilco 4015 threshold bolt rod going to rust on an exterior entrance?
The rod is zinc plated steel. That is a plated finish for corrosion resistance on a normally protected entrance, which is where a storefront threshold bolt lives. It is not a stainless part, so a coastal or wash-down opening will work it harder.
9) Is the Kaba Ilco 4015 threshold bolt rated for commercial traffic or is it a residential part?
Commercial. The 4015 is built for commercial double door openings, specifically the aluminum storefront style entrance where a pivoting deadbolt is already carrying the lock. For a property manager standardizing on a run of entrances, it is the same part on every leaf, and it keys off the deadbolt cylinder you already have.
How fast can I get the Kaba Ilco THB-4015 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 THB-4015 come with a warranty?
Absolutely. The Kaba Ilco THB-4015 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 THB-4015?
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 THB-4015 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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