How to Specify a Door Frame Profile (Complete Architectural Guide)

Learn how to specify a steel door frame profile including throat size, return, thickness, steel grade, hardware prep and roll forming requirements.

Complete Engineering & Manufacturing Guide

Door frame profiles are used in:

✔ Commercial buildings
✔ Residential housing
✔ Industrial facilities
✔ Hospitals & schools
✔ Fire-rated assemblies

Steel door frames are typically:

Cold-formed
Welded or knock-down assemblies
Installed into masonry or drywall openings

Specification must include geometry, hardware prep, and wall interface.

1️⃣ What Defines a Door Frame Profile?

A steel door frame profile is defined by:

✔ Throat size (wall thickness)
✔ Face width
✔ Return (stop detail)
✔ Thickness
✔ Steel grade
✔ Hardware preparation
✔ Fire rating (if required)
✔ Finish

Without throat size and stop detail, it cannot be manufactured correctly.

2️⃣ Throat Size (Critical)

Throat size = wall thickness the frame wraps around.

Common wall types:

100 mm masonry
150 mm block wall
Drywall partition (e.g., 92 mm stud + board)

Frame must match actual wall build-up.

Incorrect throat size causes:

Loose fit
Installation difficulty
Wall cracking

Always confirm final wall thickness.

3️⃣ Face Width

Face width is visible portion of frame.

Common face widths:

44 mm
50 mm
60 mm

Wider faces:

✔ Provide stronger visual presence
✔ Increase stiffness

Face width affects coil width and material cost.

4️⃣ Stop Detail (Door Stop Return)

Door frame includes internal stop where door closes.

Common stop depth:

12 mm
15 mm
25 mm

Stop dimension must match:

Door thickness (35 mm, 44 mm, etc.)

Incorrect stop size affects:

Door seal
Latch alignment

Stop geometry must be precise.

5️⃣ Thickness Range

Common thickness:

1.0 mm
1.2 mm
1.5 mm
1.6 mm
2.0 mm

Commercial and fire-rated frames often use thicker steel.

Thickness affects:

Impact resistance
Hinge strength
Fire performance

Machine must support maximum thickness.

6️⃣ Steel Grade

Common grades:

G250
G300
G350

Higher grade increases strength but increases forming load and springback.

Architectural frames typically use moderate strength steel.

7️⃣ Fire Rating Requirement

If fire-rated:

✔ Must meet tested assembly
✔ Specific thickness required
✔ Specific reinforcement required
✔ Approved hardware prep

Changing thickness may invalidate fire certification.

Always confirm fire requirement.

8️⃣ Hardware Preparation

Door frames must accommodate:

✔ Hinges
✔ Strike plate
✔ Lockset
✔ Closers
✔ Electric strikes

Specify:

Hinge size
Hinge location
Strike plate dimensions
Reinforcement plate thickness

Hardware prep often requires:

Secondary punching
Welded reinforcement plates

Machine and fabrication process must accommodate this.

9️⃣ Assembly Type

Common frame types:

✔ Welded frame
✔ Knock-down (KD) frame
✔ Slip-on drywall frame

Assembly type affects:

Manufacturing method
Weld points
Tolerance requirements

Specify clearly.

🔟 Finish & Coating

Common finishes:

Powder coated
Primed steel
Galvanized
Stainless steel

Interior applications typically powder coated.

Corrosive environments require galvanized or stainless.

Finish affects:

Corrosion resistance
Aesthetic quality
Warranty

1️⃣1️⃣ Typical Coil Width

Coil width =

Face + throat + stop return + back flange + bend allowance.

Example simplified:

50 mm face
100 mm throat
15 mm stop
20 mm return

50 + 100 + 15 + 20 = 185 mm
Add bend allowance → approx. 210–250 mm

Exact developed width must include:

✔ Bend radii
✔ Thickness compensation
✔ Springback correction

Never approximate coil width.

1️⃣2️⃣ Machine Engineering Requirements

Door frame roll forming line:

12–20 forming stands
60–90 mm shafts
15–37 kW motor
Servo punching unit
Secondary fabrication station
Hydraulic cut

Heavier frames require stronger frame and shafts.

Hardware punching requires precise servo control.

1️⃣3️⃣ Production Speed

Typical speeds:

10–25 m/min

Hardware punching and secondary operations limit speed.

Architectural quality requires tighter control.

1️⃣4️⃣ Tolerance Requirements

Typical tolerances:

Face width ±1 mm
Throat ±1 mm
Stop dimension ±0.5 mm
Length ±2 mm

Stop dimension is critical for door alignment.

1️⃣5️⃣ Wall Type Compatibility

Frames differ for:

✔ Masonry walls
✔ Drywall partitions
✔ Steel stud walls

Drywall frames include:

Compression anchors
Slip details

Masonry frames often include:

Anchor tabs

Wall type must be specified before design.

1️⃣6️⃣ Common Specification Mistakes

❌ Not confirming throat size
❌ Ignoring hardware reinforcement
❌ Using insufficient thickness
❌ Not confirming fire rating
❌ Guessing coil width
❌ Ignoring assembly type

Door frame errors appear during installation — costly to correct.

1️⃣7️⃣ Developed Width Reminder

Developed width must include:

✔ Face
✔ Throat
✔ Stop return
✔ Back flange
✔ Bend allowance
✔ Thickness compensation
✔ Springback correction

Door frame profiles often include multiple bends and returns.

Flat pattern calculation must be precise.

1️⃣8️⃣ Final Door Frame Specification Checklist

Before tooling or machine approval:

✔ Confirm throat size
✔ Confirm face width
✔ Confirm stop dimension
✔ Confirm thickness range
✔ Confirm steel grade
✔ Confirm fire rating requirement
✔ Confirm hardware prep details
✔ Confirm wall type
✔ Confirm finish
✔ Calculate developed width
✔ Confirm coil availability
✔ Confirm production speed target

Only then proceed.

FAQ Section

Is throat size the most important dimension?

Yes — it must match wall thickness exactly.

Does thickness affect fire rating?

Yes — certified assemblies require specific thickness.

Can hardware prep be done in-line?

Yes — with servo punching and reinforcement welding.

Is door frame roll forming complex?

Moderately — due to multiple bends and precision requirements.

Can one machine run multiple frame sizes?

Yes with adjustable tooling.

Is coil width moderate?

Yes — typically 200–300 mm depending on frame size.