Understanding Part Number Nomenclature in the Commercial Door Industry

A reference guide to how part numbers encode product configuration in commercial door, frame, and hardware distribution

This guide answers: How CDF Part Number Nomenclature Maps to Product Configuration

What Part Numbers Encode in the Commercial Door Industry

In the commercial door industry, part numbers are structured identifiers that encode key product attributes into a single string. A well-designed part numbering system allows anyone in the supply chain — from the estimator to the warehouse worker — to identify exactly what a product is without opening the packaging or looking up a separate document.

Part numbers in the door and hardware industry typically encode some or all of the following attributes:

• Product Category — Whether the item is a door, frame, hinge, lockset, closer, exit device, or accessory.
• Material — The base material such as hollow metal (steel), stainless steel, wood, aluminum, or fiberglass reinforced polyester (FRP).
• Door or Frame Size — The width and height of the door or frame, often expressed in a shorthand format (e.g., 3070 for a 3'0" x 7'0" door).
• Fire Rating — Whether the assembly is non-rated or carries a fire-resistance rating. Fire-rated door assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute ratings, and the rating level is typically embedded in the part number.
• Gauge or Thickness — The steel gauge for hollow metal products (e.g., 18-gauge, 16-gauge, 14-gauge).
• Prep Type — Hardware preparation cutouts on the door or frame (hinge prep, lock prep, closer reinforcement, etc.).
• Finish — The surface finish or coating applied to the product, referenced by BHMA designation (e.g., US32D for satin stainless steel) or paint code.
• Hand or Swing — The handing of the door (left hand, right hand, left hand reverse, right hand reverse).

Not every part number includes all of these attributes. Simpler items like hinges may encode only the size, finish, and type, while a fully configured hollow metal door part number may encode a dozen or more attributes.

How Part Numbers Are Structured

Commercial door industry part numbers typically follow a segmented structure where each segment represents a specific attribute. Segments are separated by dashes, slashes, or positional encoding (where the position of characters within the string determines their meaning).

Segmented Part Number Example

Consider a hypothetical hollow metal door part number: HM-3070-18-90-C161-P1

• HM — Product category: Hollow Metal door
• 3070 — Size: 3'0" wide by 7'0" tall
• 18 — Gauge: 18-gauge steel
• 90 — Fire rating: 90-minute rated
• C161 — Prep code: specific hinge and lock cutout configuration
• P1 — Finish: factory primer

This is a generalized illustration. Actual part number formats vary by manufacturer and distributor. The key principle is that each segment carries specific meaning and the order of segments is consistent within a given system.

Positional Encoding

Some manufacturers use positional encoding where specific character positions in the part number correspond to specific attributes. For example, characters 1-2 might indicate product type, characters 3-6 might indicate size, and characters 7-8 might indicate gauge. This approach allows for compact part numbers but requires familiarity with the system to decode.

Decoding Part Numbers: A Step-by-Step Approach

When you receive a part number from a specification, submittal, or purchase order, follow these steps to decode it:

Step 1: Identify the Manufacturer or Distributor

Part number formats are specific to each manufacturer and distributor. A part number from one company cannot be decoded using another company's system. Always confirm which company's numbering system you are working with.

Step 2: Locate the Part Number Key

Most manufacturers publish a part number key or nomenclature guide in their catalog, on their website, or in their submittal documents. This key explains what each segment of the part number represents.

Step 3: Break the Part Number into Segments

Using the key, divide the part number at its natural break points (dashes, slashes, or positional boundaries). Map each segment to its corresponding attribute.

Step 4: Verify Against the Specification

After decoding, verify that the attributes encoded in the part number match the project specification requirements. Confirm size, material, fire rating (20-minute, 45-minute, 60-minute, 90-minute, or 180-minute where applicable), gauge, prep, finish, and handing all align with the door schedule and hardware specification.

Step 5: Contact the Supplier for Confirmation

If any segment is unclear or if the part number does not match a published key, contact the manufacturer or distributor directly. Ordering based on an incorrectly decoded part number results in wrong products arriving on site.

Why Accurate Part Numbers Matter in Commercial Construction

In commercial construction, part numbers serve as the definitive identifier throughout the supply chain. From the estimator's takeoff to the warehouse pick ticket to the installer's packing slip, the part number must accurately represent the product. Errors in part numbers cascade through the entire process.

Consequences of Part Number Errors

• Wrong Size — A door that does not fit the frame opening requires reordering and delays the project.
• Wrong Fire Rating — Installing a non-rated door in a fire-rated opening is a code violation. The assembly will fail inspection and must be replaced. Fire-rated assemblies must match the required rating exactly: 20-minute, 45-minute, 60-minute, 90-minute, or 180-minute.
• Wrong Prep — Hardware cutouts that do not match the specified hardware mean the lockset, closer, or exit device will not fit. The door must be returned and reprepped or replaced.
• Wrong Finish — Mismatched finishes are visible to building owners and architects during final walkthrough and typically require replacement.

Using a configurator tool like CDF's ProBuilder reduces part number errors by building the part number from your selections automatically. Rather than manually constructing a part number, you select your attributes — size, material, fire rating, gauge, prep, finish — and ProBuilder generates the correct configuration.

A Note on Fire-Rated Assemblies

Fire-rated door assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute ratings. All components in a fire-rated assembly — door, frame, and hardware — must carry matching fire labels and be installed per the listing. Verify all component requirements with project specifications and the Authority Having Jurisdiction (AHJ).

Configure Your Door Assembly

CDF uses a structured part numbering system that maps directly to product configurations. Rather than manually decoding part numbers, use CDF's ProBuilder tool to configure complete door, frame, and hardware assemblies by selecting your requirements. ProBuilder generates accurate configurations and provides instant pricing, eliminating part number guesswork.

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.

Frequently Asked Questions

About CDF Distributors

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.