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Slab only  Door only — frame, hinges and lock hardware are sold separately.

Mortise Prep Steel Door Slabs90-Minute Fire Rated

Hollow metal steel door slabs with a 7-7/8" mortise lock pocket for apartment and commercial mortise locksets. 20-gauge galvannealed steel, 1-3/4" thick, insulated honeycomb core — in stock at our Brooklyn and Brentwood, NY warehouses.

Shop sizes (718) 455-8442
  • 90-minute fire rated
  • Stocked in Brooklyn & Brentwood
  • Pickup, delivery or freight
  • Serving NYC since 1924

11 products

What you get

Sold as a slab only

Each listing is the steel door leaf only, prepped for a mortise lockset so your hardware installs cleanly. The frame, hinges and lockset are not included — order them separately or call us for a complete door package.

Included

  • Steel door slab (door leaf only)
  • Reinforced 7-7/8" mortise lock pocket
  • 20-gauge galvannealed steel, 1-3/4" thick
  • Insulated honeycomb core
  • 90-minute fire rating
  • Your choice of left or right hand

Not included — sold separately

  • Door frame (welded or knock-down)
  • Hinges
  • Mortise lockset and cylinder
  • Door closer, panic bar and other hardware
  • Installation (available — call for a quote)

Specifications

Slab specifications

ProductSteel door slab — door only
Lock prep7-7/8" mortise pocket, reinforced
Material20-gauge galvannealed steel
Thickness1-3/4"
CoreInsulated honeycomb
Fire rating90 minutes
Nominal widths30", 32", 34", 36"
Nominal heights80", 84", 96"
Actual slab size1/4" narrower and 3/4" shorter than nominal
HandingLeft hand or right hand
Price$398.48, any size
AvailabilityIn stock — Brooklyn & Brentwood, NY
DeliveryWarehouse pickup, NYC delivery, LTL freight nationwide

Handing

Left hand or right hand?

Hinges on left = Left Hand
Hinges on right = Right Hand

Stand outside the door, on the side you push from. If the hinges are on your left, order Left Hand. If they're on your right, order Right Hand. Not sure? Call us and we'll help you confirm before you order.

FAQ

Mortise door slab FAQ

Does a mortise door slab include the frame or hardware?

No. These are sold as door slabs only — the steel door leaf itself. The frame, hinges, mortise lockset and any closer or exit device are sold separately. See our steel door frames and door hardware, or choose a complete KIN steel door unit.

What is a mortise prep door slab?

A mortise prep slab has a 7-7/8" pocket cut into the lock edge to accept a mortise lockset — the box-style lock body used on many apartment and commercial doors. If you're installing a knob or lever set that goes through a round bore, choose a cylindrical prep slab instead.

What size steel door slab should I order?

Order by the nominal opening size, for example 36" x 84". The slab itself measures 1/4" narrower and 3/4" shorter to leave clearance inside the frame. We stock 30" to 36" widths and 80" to 96" heights.

Are these steel door slabs fire rated?

Yes. Every slab on this page is 90-minute fire rated. For a fire-rated opening, the frame, hinges and lockset must also be rated for the assembly.

How do I pick up or get my door slab delivered?

All sizes are in stock at our Brooklyn and Brentwood, NY warehouses. Pick up at the warehouse, choose NYC delivery, or ship LTL freight nationwide.

Can you make a custom size door slab?

Yes. We fabricate to spec in our New York factory. Contact us for a quote or contractor pricing.

Related

Shop related products

Cylindrical Prep Door SlabsFor knob and lever locksetsSteel Door FramesWelded and knock-down framesComplete Door UnitsDoor, frame and hardware together

Need a custom size or a full door package?

We fabricate steel doors to spec in our New York factory and supply complete openings with frame and hardware. Contractor pricing available.

Request a Quote(718) 455-8442