Full Mortise Hinges

Auto Door Closer Hinge – Quite Close Spring Hinge – Aesthetic- Fully Adjustable – Adjust Closing Force – Adjust Closing Speed. ADA Compliant – ANSI Grade 1 – UL Listed- Fire-rated

Catalog
Specification
case study
Automatic fire door closers-K51M

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keep privacy

Private space

keep bugs outside

Keep bugs outside

easy to open

So easy to open the door

Installation tips

Mortise on both door and frame for optimal installation.
Make sure door and frame are well aligned and not sagging or tilted.

Fire door closers-hinge installation tips-1
  • Non-mortise: Preserve 10 mm distance between door edge and jamb
  • Mortise: Preserve 3-4 mm distance between door edge and jamb
Info of K51M -2
  • Mortise installation: Mortise prepared by door suppliers
Gate door-fire door closers
Interior doors-fire door closers
Metal frame door-fire door closers
Office metal frame door-fire door closers

Comparison with door closer

Waterson Self-closing hingeTraditional door closer
Position
On door and easy as regular hinges
On door and need to preserve installation space
Aesthetics
Elegant and minimized visual intrusion
Bulky and maximized visual intrusion
Opening
Effortless
Strenuous
Outdoor
Yes, High Weather resistance
Yes and easily broken
Fire resistanceYesYes
Durability
1 million cycle test passed
Mostly 20 thousand cycles depending on brands
CostHardware+ Installation+ Maintenance Low total costHardware+ Installation+ Maintenance High total cost
Waterson Self Closing Hinge V.S. Door Closer

Easy Open for Heavyduty Doors

UL And SGS Test Report

Specification

ModelFull NameDoor ThicknessMortise Width
(min)
Mortise Depth (min)Gap of the hinged side (non-mortise)
K51M-4004″ x 4″ (H*W)
US Standard
Auto Door-Closer Hinge
35-45 mm33.5mm3.3mm8.6mm
K51M-4504.5″ x 4.5″ (H*W)
US Standard
Auto Door-Closer Hinge
40-50 mm38.5mm3.3mm8.6mm
K51M-5005″ x 5″ (H*W)
US Standard
Auto Door-Closer Hinge
45-55 mm43.5mm3.71mm9.5mm
K51M-500D5″ x 5″ (H*W)
US Standard
Auto Door-Closer Hinge
45-55 mm43.5mm4.83mm11.7mm
K51M-6406″ x 4″ (H*W)
Auto Door-Closer Hinge
40-45 mm33.5mm4.06mm10mm
K51M-6456″ x 4.5“ (H*W)
Auto Door-Closer Hinge
45-50 mm38.5mm
K51M-6506″ x 5“ (H*W)
Auto Door-Closer Hinge
50-55 mm43.5mm
K51M-6556″ x 5.5“ (H*W)
Auto Door-Closer Hinge
55-60 mm48.5mm
K51M-6606″ x 6“ (H*W)
Auto Door-Closer Hinge
60-65 mm53.5mm

Catalog

US AREA
Non-US Area

Specificaiton

US Area
Non-US Area

Templates

K51M-450
K51M-640
K51M-645
K51M-650
K51M-655
K51M-660

Installation Instruction

Installation is lightning fast and easy! You only need to hinges to door/frame and one hex wrench to adjust. Let’s see the operation guide!

Installation guide

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