Diamond manufactures the largest and most complete line of knock down door systems in the industry. Knock down doors are typically supplied in stocking programs and have many varieties and choices to make a product fit the customer's unique specifications and provide a best fit for their building and wall applications.

Door Choices

Doors are made from 20 gauge galvanized (A40) steel, with 18 gauge as an option. Doors are made reversible, with either a straight edge or beveled edge. Hinge reinforcements are 7 or 10 gauge. The skin itself can be textured or smooth. The standard core is polystyrene insulated with polyurethane an option when higher R values are required. Lock reinforcements for every lock type are available and included. An optional closer reinforcement is available.

Frame Choices

Frames are 16 gauge galvanized (A40) with a butted jamb to head connection for reversibility. Hinge reinforcements are 7 or 10 gauge. Many frame profiles are available, with the "kerf " type frame becoming the industry norm due to the ease of weatherseal application. "Open back" frames are generally used when no framed opening will be supplied. In this case, the frame is commonly designed to match the girt depth. A frame with 1/2" returns will be used in conjunction with a framed opening or other traditional wall applications (various anchors are available for each wall application).

Hardware Choices

Diamond provides several hardware lines depending upon the customer requirements. Each line is complete with many different types of locks and price points. The "best value" is Diamond's own line of Southern Hardware. The best feature of this line may be the stainless steel finish on various grades of levers and knobs, or it may be the extended warranties, or it may be just the number of choices available.


All knock down doors are poly-bagged, and then wrapped in corrugated sleeves for ultimate protection. Frames and miscellaneous hardware components are packaged in a corrugated box. Larger hardware items, such as panic devices, and closers are supplied in their factory boxes.
All items are palletized in appropriate quantities for the stock or project order. Export orders are packaged in registered export wood crates.


Doors have a baked-on finish coat of paint. The mills of paint averages 1.2 mills dry. Standard colors are white, bronze, or gray, but special colors are available for stocking programs or large products.


Diamond produces the largest selection of preassembled doors in the industry. Preassembled doors differ from knock down doors because they are completely factory assembled including all hardware, lite kits, and a subframe system (c-channel/framed opening). The installation time for preassembled doors averages 35 minutes so compared to knock down doors, this might mean 4 to 8 hours of immediate labor savings. Preassembled doors are also beneficial because all hardware is guaranteed to be installed correctly and in good working order. Comparing the total preassembled and knock down costs over time, including the cost of call backs and lost parts, a preassembled door may be some builders best option.

Key Features

20 Gauge Door, A40 Gal, Reversible, Insulated
​Smooth or Textured Door Skins
16 Gauge Kerf Frame, A40 Gal 5 3/4" Depth, Reversible
16 Gauge Subframe system (full c-channel) - painted to match
12 Gauge Adjustable Top/Bottom L-Brackets
Southern HD Grade 2 Lever Lock US32D (stainless steel)
Kerf frame profile and weatherseal
Full 5 3/4" Aluminum Saddle Type Threshold
Ball Bearing, NRP Hinges (powder coated)
Exterior Mount Sweep/Drip Combination
Full Line of Optional Hardware

Common Options

18 Gauge Door Upgrade
Stainless Steel Hinges (US32D)
Mortise Lever Lock
Exit Devices
Lite Kits (single pane and insulated glass)
Crash Chains
Special Color
​Special Sizes


Doors have a baked-on finish coat of paint. The mills of paint averages 1.2 mills dry. Standard colors are white, bronze, or gray, but special colors are available for stocking programs or large products


Doors are made to individual order specifications. After doors are completely assembled they are packaged in wood "surround". Doors are skidded up to four (4) high on 3070's and 4070's and two (2) high on 6070's. Skids are 4-way and have 4 length long runners.


52294 US-290
Hempstead, TX 77445


Mon - Friday: 8am - 5:00pm


Phone: 979.826.0238


52294 US-290
Hempstead, TX 77445


Office Hours:
Mon - Friday: 8am - 5:00pm


Phone: 979.826.0238
Email: sales@diamonddoorproducts.com