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(Free Shipping at 45+ doors)

Call for custom sizes or quantity pricing.

Lead Time 15 Working Days


Williams Brothers SMP 120 Series Surface Mounted Access Door
When access is a requirement without a framed opening, our precision fit surface mounted access door is the solution in all types of walls and ceilings. Comes standard with a semi-concealed, continuous piano hinge for ease of use. The frame is laser cut from one sheet of steel for visual aesthetics.  The 1½" trim allows for an inconsistent ruff opening better than access doors with a 1" trim.  These doors come ready to paint with a grey baked enamel primer coating.  The optional gasketing can be applied to four sides providing a better weather resistant and smoke seal compared to other manufacturers that can only apply the gasketing  to three sides. The flush, stainless steel screwdriver cam latch will resist rust allowing for years of service.


Submittal Sheet  Certificates of Approval  WB Catalog 

Cross Reference Chart 

Options and Accessories  Warranty 


  • Door: 14 ga. steel. Trim is 1½" wide
  • Door Stops: 18 ga. steel on 3 sides of door opening 
  • Hinges: Full length piano hinge allows door to open to 180º  
  • Latches: Flush, stainless steel screwdriver cam latch
  • Finish: Grey baked enamel primer coat


  • Stainless Steel Finish Type 304 No. 4 Satin Finish Brushed
  • Stainless Steel Finish Type 316 No. 4 Satin Finish Brushed
  • WB 151 Key Code Cylinder locks-keyed alike with 2 keys per lock (priced above)  
  • Weather resistive neoprene gasketing all 4 sides* (priced above)
  • Special sizes available

* GASKETING: Weather resistive gasketing, closed cell sponge, blend of Neoprene/EPDM/SBR. Meets ASTM D-1056: SCE 41, RE 41, 2A1; substrate UL 94HF-1 recognized.



  • Acudor Products Inc - SF-2000
  • Babcock-Davis - N/A
  • Cendrex Inc. - SFM
  • ELMDOR Manufacturing Company - SF
  • Karp Associates, Inc. - DSC-214SM
  • J.L. Industries - N/A 
  • Larsen's Manufacturing - N/A
  • MIFAB Manufacturing, Inc. - MI-SF
  • Milcor - N/A
  • Nystrom Building Products - N/A
  • Williams Brothers - SMP 120

     Call for custom sizes, price and availability.
    W x H Wall Opening Cam Latch   W x H Wall Opening Cam Latch
    8 x 8 - 1   18 x 18 - 3
    12 x 12 - 1   24 x 24 - 4
    16 x 16 - 3        

    (Free Shipping at 45+ doors)

    Call for custom sizes or quantity pricing.