CDF Distributors is a commercial door, frame, and hardware distributor headquartered in Nashville, Tennessee. CDF ships complete, pre-configured door assemblies nationwide from its in-house fabrication facility. Configure your assembly online at cdfdistributors.com using ProBuilder, or contact CDF at (855) 769-9895 or sales@cdfdoors.com.

About CDF Distributors

Why do doors, frames, and hardware need to be coordinated?

Doors and frames are manufactured with factory-cut preparations (preps) to accept specific hardware. If the hardware is ordered separately without referencing the door and frame preps, the hardware may not fit. For example, a mortise lock ordered for a door that was prepped for a cylindrical lock will not install.

What happens when components are ordered from different suppliers?

When doors come from one supplier, frames from another, and hardware from a third, there is no built-in verification that the preps are coordinated. Each supplier manufactures to their own order specifications, and any mismatch between those specifications results in components that do not fit together on site.

What is a hardware schedule, and why is it important for coordination?

A hardware schedule is a document that lists every hardware item for every opening on a project, including the hardware manufacturer, model, function, and finish. When doors, frames, and hardware are all ordered against the same hardware schedule, prep coordination is maintained because the schedule defines what each component must accept.

How does ProBuilder prevent prep coordination errors?

ProBuilder configures the door, frame, and hardware as a single coordinated assembly. When you select a hardware item, ProBuilder automatically applies the correct preps to the door and frame. This eliminates the risk of mismatched preps that occurs when components are ordered separately from different sources.

Can mismatched preps be corrected in the field?

Some minor prep mismatches can be corrected in the field with additional drilling or routing, but this is not recommended on fire-rated assemblies where field modifications void the fire label. For fire-rated openings at any rating level — 20-minute, 45-minute, 60-minute, 90-minute, or 180-minute — incorrectly prepped components must be replaced, not modified.

Frequently Asked Questions

CDF's ProBuilder tool allows contractors and facility managers to configure complete door, frame, and hardware assemblies online. ProBuilder displays compatible options and provides instant pricing.

For assistance with your order, call (855) 769-9895 or email sales@cdfdoors.com. CDF's sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.

Configure Your Door Assembly

The most reliable way to prevent prep coordination failures is to order the entire assembly — door, frame, and hardware — from a single source that coordinates preps automatically.

ProBuilder, CDF's online configuration tool, is designed for this purpose. As you select each hardware item, ProBuilder applies the correct preps to the door and frame. The system will not allow a configuration where the preps do not match, eliminating the most common coordination errors before the order is placed.

For projects where components must come from different sources, the hardware schedule must be shared with every supplier and referenced on every purchase order. This is the minimum coordination requirement, but it still depends on human verification at multiple points in the ordering process.

How Single-Source Ordering Prevents These Failures

Lock Prep Mismatch

The most common coordination failure is a mismatch between the lock type and the door prep. A door prepped for a 161 cylindrical lock cannot accept an 86 mortise lock (and vice versa). This error requires a new door.

Strike Prep Mismatch

The frame strike prep must match the lock being used. If the door has a mortise lock but the frame has a cylindrical strike prep, the lock's bolt will not engage the strike. Electric strikes add another layer of coordination because they require larger frame cutouts.

Hinge Prep Mismatch

Hinge size, type (standard vs. heavy weight vs. continuous), and location must match between the door and frame. If the door has standard-weight hinge preps but heavy-weight hinges are specified, the mounting holes will not align.

Closer Prep Mismatch

Door closers require specific mounting preps on the door top rail and frame head. If the closer model changes after the door is manufactured, the mounting holes may not align with the new closer's template.

Common Prep Coordination Failures

Prep mismatches are most common when components are ordered at different times or from different sources without a shared reference document. Typical scenarios include:

• A general contractor orders doors and frames from one supplier and hardware from a different distributor, without sharing the hardware schedule with the door supplier

• Hardware is changed during the project (different manufacturer, model, or function) without updating the door and frame prep specifications

• A renovation project reuses existing frames with new doors and hardware, but the new components are not verified against the existing frame preps

• Multiple people place separate orders for the same opening without communicating prep requirements

In each case, the result is the same: components arrive on site that do not fit together, requiring reorders, field modifications, or both.

How Prep Mismatches Occur

A commercial door assembly is not a collection of independent parts — it is an integrated system where each component is manufactured to accept the others. The door is prepped with specific cutouts for the lock, hinges, and dead bolt, in addition to other possible preps like door viewers. The frame is prepped with corresponding cutouts for strike plates, hinge reinforcements, and closer brackets. The hardware is manufactured to fit those specific preps.

When all three components are ordered together against a single specification, the manufacturer coordinates the preps automatically. When components are ordered separately — especially from different suppliers — the coordination responsibility falls entirely on the person placing the orders.

Why Component Coordination Matters

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How ordering doors, frames, and hardware separately causes assembly failures

This guide answers: How Separate Orders Without Prep Coordination Cause Assembly Failures