Commercial Self-closing Hinge

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

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SPEC-US

SPEC-NON US

Automatic fire door closers-K51M

Commercial Self-closing Hinge

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

Automatic fire door closers-K51M

Looking For A Solution?

keep privacy

Private space

keep bugs outside

Keep bugs outside

easy to open

Easy to open 

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 hinge Traditional 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 resistance Yes Yes
Durability
1 million cycle test passed
Mostly 20 thousand cycles depending on brands
Cost Hardware+ Installation+ Maintenance

Low total cost

Hardware+ Installation+ Maintenance

High total cost

Waterson Self Closing Hinge V.S. Door Closer

UL And SGS Test Report

Specification and Combination

US STANDARD 

Model DIM Radius Gauge Finish Door Spec
Self-closing Combination Self-closing & Hold-open Combination
K51M-400 4″ x 4″ (H*W)

Square

1/4R

5/8R

0.13″
3.3MM
Satin Brushed

Polished

Golden

Black

≤ 260 lbs
< 7’0 x 4’0
 ( SA, SA, SA1 ) =
( Top, Middle, Bottom)
( SB, SA, SA1 ) =
( Top, Middle, Bottom)
K51M-450 4.5″ x 4.5″ (H*W) ( DS, HA, SA1 ) =
(Top, Middle, Bottom)
K51M-500 5″ x 5″ (H*W) 0.146″
3.71MM
≤ 330 lbs
< 8’0 x 4’0
( SA, SA, SA1, SA1 ) =
( Top, Middle, Middle, Bottom)
Hole-open is not provided.
K51M-500D 5″ x 5″ (H*W) 0.190″
4.83MM
( DS, HA, SA1, SA1 ) =
( Top, Middle, Middle, Bottom)

US STANDARD 

Model DIM Radius Gauge Finish Door Spec
Self-closing Combination Self-closing & Hold-open Combination
K51M-400 4″ x 4″ (H*W)

Square

1/4R

5/8R

0.13″
3.3MM
Satin Brushed

Polished

Golden

Black

≤ 260 lbs
< 7’0 x 4’0
 ( SA, SA, SA1 ) =
( Top, Middle, Bottom)
( SB, SA, SA1 ) =
( Top, Middle, Bottom)
K51M-450 4.5″ x 4.5″ (H*W) ( DS, HA, SA1 ) =
(Top, Middle, Bottom)
K51M-500 5″ x 5″ (H*W) 0.146″
3.71MM
≤ 330 lbs
< 8’0 x 4’0
( SA, SA, SA1, SA1 ) =
( Top, Middle, Middle, Bottom)
Hole-open is not provided.
K51M-500D 5″ x 5″ (H*W) 0.190″
4.83MM
( DS, HA, SA1, SA1 ) =
( Top, Middle, Middle, Bottom)

OTHER COUNTRIES

Model DIM Door Thickness Gauge Finish Door Spec
Self-closing Combination
Self-closing & Hold-open Combination
K51M-640 6″ x 4″ (H*W) 35-45 mm 4.1 mm Satin Brushed

Polished

Golden

Black

≤ 70kg
<1800 x 1250 mm
 ( DS, HA ) = ( Top, Bottom)
( SA, SA1 ) =( Top, Bottom)
( SB, HS ) = ( Top, Bottom)
K51M-645 6″ x 4.5″ (H*W) 40-50 mm
K51M-650 6″ x 5″ (H*W) 45-55 mm ≤ 120kg
<2200 x 1250 mm
( DS, HA, SA1 ) = (Top, Middle, Bottom)
( SA, SA, SA1 ) = (Top, Middle, Bottom)
 ( SB, SA, HS ) = (Top, Middle, Bottom)
( SB, SA, SA1 ) = (Top, Middle, Bottom)
K51M-655 6″ x 5.5″ (H*W) 50-60 mm
K51M-660 6″ x 6″ (H*W) 55-65 mm

OTHER COUNTRIES

Model DIM Door Thickness Gauge Finish Door Spec
Self-closing Combination
Self-closing & Hold-open Combination
K51M-640 6″ x 4″ (H*W) 35-45 mm 4.1 mm Satin Brushed

Polished

Golden

Black

≤ 70kg
<1800 x 1250 mm
 ( DS, HA ) = ( Top, Bottom)
( SA, SA1 ) =( Top, Bottom)
( SB, HS ) = ( Top, Bottom)
K51M-645 6″ x 4.5″ (H*W) 40-50 mm
K51M-650 6″ x 5″ (H*W) 45-55 mm ≤ 120kg
<2200 x 1250 mm
( DS, HA, SA1 ) = (Top, Middle, Bottom)
( SA, SA, SA1 ) = (Top, Middle, Bottom)
 ( SB, SA, HS ) = (Top, Middle, Bottom)
( SB, SA, SA1 ) = (Top, Middle, Bottom)
K51M-655 6″ x 5.5″ (H*W) 50-60 mm
K51M-660 6″ x 6″ (H*W) 55-65 mm

Catalog

US AREA
Non-US Area

Specification

US Area
Non-US Area

Templates

K51M-400
K51M-450
K51M-640
K51M-645
K51M-650
K51M-655
K51M-660

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