A commercial-grade 36" x 80" knock-down (KD) steel door frame for 1-3/4" thick doors in drywall walls. Available in left hand or right hand and three jamb depths. Ships compact, assembles on site, and gives a clean, professional finish for new construction and renovations.

• 16 gauge steel – heavy-duty hollow metal built for high-traffic openings
• Knock-down design – ships flat, sets into finished or framed drywall walls
• Hinge prep – reinforced for 3 standard 4-1/2" hinges
• Strike prep – welded strike reinforcement for standard latch hardware
• 2" face trim – clean, finished look on both sides
• UL labeled – for use in fire-rated openings; pairs with UFD's 90-minute fire-rated stock steel doors

Measure your finished wall thickness (studs + drywall on both sides) and pick the matching jamb depth:

• 3-3/4" – 2-1/2" metal studs with one layer of 5/8" drywall each side
• 4-7/8" – 3-5/8" metal studs with one layer of 5/8" drywall each side
• 6-1/8" – 3-5/8" metal studs with two layers of 5/8" drywall each side

Not sure? Send us your wall thickness and we'll confirm before you order.

Stand on the outside of the opening (the side the door swings away from). If the hinges are on your left, order Left Hand; if they're on your right, order Right Hand. See the door swing chart in the photos – a Right Hand frame also works as a Left Hand Reverse, and a Left Hand frame as a Right Hand Reverse.

• Opening size: 36" x 80" (6'-8" tall)
• Handing: Left Hand or Right Hand (select above)
• Jamb depths: 3-3/4", 4-7/8", 6-1/8"
• Material: 16 gauge hollow metal steel
• Face trim: 2"
• Door thickness: 1-3/4" (steel or wood)
• Hinges: 3 × 4-1/2", located 5", 35-1/4", 65-1/2" down from the inside top of the frame to the top of each hinge
• Wall type: Interior drywall

• Apartment buildings and multifamily renovations
• Offices, retail and commercial buildings
• Schools, healthcare and institutional projects
• Utility, storage and mechanical rooms

Is a knock-down frame as strong as a welded frame?
Once installed and anchored, a 16 gauge KD frame performs well in most interior openings. Welded frames are preferred for masonry walls and very heavy-use openings – ask us if you're unsure.

Can I install it in an existing wall?
Yes. Knock-down frames are designed to slip over finished drywall, which makes them a common choice for renovations.

Do you have the matching door?
Yes – we stock 36" x 80" steel doors, 1-3/4" thick, 90-minute fire rated, prepped to match these hinge locations.

A Brooklyn steel door manufacturer since 1924. UL Listed and NYC MEA Approved. Pick up in Brooklyn (1171 Myrtle Ave) or Brentwood (75 Emjay Blvd), or call 718-841-0767 for help choosing the right frame.

3-5 Business days, Next day expedition available

For an additional fee

No