Waterson Heavy Duty Commercial Fully Adjustable Self-Closing Door Hinge 3-Pack 4.5" x 4.5" – K51M-450 (SA,SA,SA1)

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Waterson HingesSKU: WS-K51M-450-A3-BLK

Sale price$385.55 Regular price$428.39


  • CERTIFICATION | ADA, UL compliant Grade 1
  • ADVANCED ENGINEERING | Combining door closers, spring hinges and an optional hold open feature into one attractive & unobtrusive component.
  • FULLY ADJUSTABLE | Closing force and speed adjustable according to environment needs.
  • PRECISION | Digital panel tension locking capability.
  • DURABLE | Fully weather resistant stainless steel construction -- purely mechanical, NO LEAKING.
  • Application: Hotel guest room / Metal door / Commercial fire-proof door


    • SB Hinge - Door closing+control closing speed+hold-open at 85°+/-5°
    • SA1 Hinge - Controls Closing Speed from 0-20° and Closing Force.
    • DS: Provides Closing Force, double power output.
    • HA: Hydraulic buffer in 0-20°+control speed in 20-90°
    • S: Spring Closing Force
    • A: 20-90° Closing Speed Control
    • A1: 0-20° Closing Speed Control
    • H: Hydraulic buffer
    • B: Hold-open at 85°+/-5°

     Included Products:

    1. 3mm hex wrench*1pc
    2. 5mm hex wrench*1pc
    3. For the wood door - Crosshead self-tapping screws (SUS#12-24 UNC-1/2"L)
    4. For the metal door - Crosshead machine screws (SUS#12x1-1/4"(31.75mm)L)
We know some products may seem confusing so, We're here to help!
Contact / Call Us with any General Questions, Customization
or Specific Products. We'd be happy to assist you.
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