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The 3-1/2″ in. Steel Bore Adapter Plate help to cover up wood damage, re-size holes and reinforce locking systems.
- Reduces bore from 3-1/2″ in. down to 2-1/8″ in.
- Allows for use on all door locks from standard residential to commercial quality
- For use with Mortise Deadbolt and Rim Cylinders
- Includes 2 parts
- Available in a Standard Brass, Antique Brass or Chrome Finish
Manufacturer Resources
Product Specs
- Product Type:
- Door Station Adaptor
- Product Group:
- Rim Cylinder
- Product Subgroup:
- Parts and Accessories
- Subcategory:
- Accessories
- Commercial/Residential:
- Commercial
- Product Category:
- Rim Cylinder
- Department:
- Door Hardware
Pro-Lok EAP-120-B – Frequently Asked Questions
1) I have a 3-1/2 inch hole in my door from an old lock. Will the Pro-Lok adapter plate let me install a standard cylinder there?
That is exactly what it is for. The Pro-Lok steel bore adapter plate reduces a 3-1/2 inch bore down to 2-1/8 inch, which is the standard cross bore for most lock cylinders and deadbolts. It also covers the surrounding wood damage left by the old hardware and reinforces the door around the new lock.
2) Can I use the Pro-Lok 3-1/2 inch adapter plate with a mortise deadbolt or a rim cylinder?
Both. The plate is made for use with mortise deadbolts and rim cylinders, and it works with door locks from standard residential up through commercial grade hardware.
3) My door has a hole smaller than 3-1/2 inches. Will this Pro-Lok plate still work?
No. This plate is sized for a 3-1/2 inch bore and reduces it to 2-1/8 inch. If your existing hole is smaller than 3-1/2 inches the plate will not seat over it, and you would need a wrap or filler matched to your actual bore diameter.
4) Does the Pro-Lok adapter plate come as a pair for both sides of the door?
Yes, it ships as a 2 piece set, so you get a plate for each face of the door. That matters on a through-bore repair where the damage shows on the inside as well as the outside.
5) Is this Pro-Lok adapter plate strong enough for a commercial door, or is it a residential repair part?
It is a steel plate rated by Pro-Lok for commercial use, and it is sold for locks ranging from standard residential to commercial quality. Beyond covering the oversized hole, the steel adds reinforcement around the lock, which is the point of using it on a high traffic opening rather than a plastic filler.
6) What finishes does the Pro-Lok 3-1/2 inch bore adapter plate come in?
Three: brass, antique brass, and chrome. Pick the one that matches the cylinder or deadbolt trim already on the opening, since the plate sits directly under the lock and is visible on the door face.
How fast can I get the Pro-Lok EAP-120-B 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 Pro-Lok EAP-120-B come with a warranty?
Absolutely. The Pro-Lok EAP-120-B 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 Pro-Lok EAP-120-B?
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 Pro-Lok EAP-120-B 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.