Commercial Stainless Steel Closer Hinge

Commercial self-closing hinges need to handle the daily rigors of frequent use. Waterson Stainless Steel Closer Hinges are designed to manage commercial closing demands while maintaining fluid and effective movement, particularly with obligatory fire rated doors. A typical 7’0 door utilizes three active Waterson Closer Hinges to create a perfect, self-closing system. Each hinge’s unique numerical panel allows the spring tensions to adjust precisely according to door weight and environmental conditions. Additionally, Waterson hinges meet all ADA codes concerning speed control, closing force, and door clearance.

Automatic fire door closers-K51M
  • 3hr Fire Rated
  • Commercial Grade
  • 304/ 316 Stainless Steel
  • Aesthetically pleasing
  • Fully Speed & Force Adjustable
  • ADA Compliant
  • ANSI A156.17 Grade One – UL Listed

Specify Waterson

Specification and Configuration

US STANDARD 

1. Specification

Hinge Type DIM (H x W) BHMA# Door thickness Model# Gauge Options
Full Mortise 4″ x 4″ A40M 1-3/8″ K51M400

0.130″

STANDARD FINISHES
US32D-630-Satin Stainless Steel
MATCHING FINISHES
US19-631-Flat Black – Powder coating
US10B-695-Dark Satin Bronze – Powder coating
US4-731-Satin Brass – Physical vapor deposition
Custom
CORNERS
Square
1/4R radius
5/8R radius
4-1/2″ x 4-1/2″ A45M 1-3/4″ K51M-450

0.134″

5″ x 5″ A50M 1-3/4″~2-1/2″ K51M-500

0.146″

5″ x 5″ A50B 1-3/4″~2-1/2″ K51M-500D

0.190″

6″ x 6″ A60M 1-3/4″~2-1/2″ K51M-600

0.160″

Swing Clear 4-1/2″ x 4-1/2″ A45M5 1-3/4″ K51L-SWRH-450

0.134″

5″ x 4-1/2″ n/a 1-3/4″ K51L-SWRH-545

0.146″

2. Configuration

DOWNLOAD
Door Size Product SKU
Full mortise 4.5*4.5
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90°Hold-open
1-3/4″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-450-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-450-B3

H

3 hinges/door (DS.HA.SA1)
K51M-450-C3 M 3 hinges/door (SB.SA.SA1)
K51M-450-D3 H 3 hinges/door (DS.HA.SB)
1-3/4″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-450-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-450-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/4″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-450-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-450-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

DOWNLOAD
Door Size Product SKU
Full mortise 4*4
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90° Hold-open
1-3/8″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-400-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-400-B3

H

3 hinges/door (DS.HA.SA1)
K51M-400-C3 M 3 hinges/door (SB.SA.SA1)
K51M-400-D3 H 3 hinges/door (DS.HA.SB)
1-3/8″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-400-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-400-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/8″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-400-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-400-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

DOWNLOAD
Door Size Product SKU
Full mortise 5*5
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90°Hold-open
1-3/4″ ~ 2-1/4″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-500-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-500-B3

H

3 hinges/door (DS.HA.SA1)
K51M-500-C3 M 3 hinges/door (SB.SA.SA1)
K51M-500-D3 H 3 hinges/door (DS.HA.SB)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-500-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-500-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-500-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-500-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

DOWNLOAD
Door Size Product SKU
Full mortise 5*5
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90°Hold-open
1-3/4″ ~ 2-1/4″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-500D-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-500D-B3

H

3 hinges/door (DS.HA.SA1)
K51M-500D-C3 M 3 hinges/door (SB.SA.SA1)
K51M-500D-D3 H 3 hinges/door (DS.HA.SB)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-500D-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-500D-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-500D-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-500D-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

US STANDARD 

1. Specification

Hinge Type DIM (H x W) BHMA# Door thickness Model# Gage Options
Full Mortise 4″ x 4″ A40M 1-3/8″ K51M400

0.130″

STANDARD FINISHES
US32D-630-Satin BrushedMATCHING FINISHES
USL1-631-Matte Black
US10B-640-Oil Rubbed Bronze
US4-619-Satin Brass
CustomCORNERS
Square
1/4R radius
1/5R radius
4-1/2″ x 4-1/2″ A45M 1-3/4″ K51M-450

0.134″

5″ x 5″ A50M 1-3/4″~2-1/2″ K51M-500

0.146″

5″ x 5″ A50B 1-3/4″~2-1/2″ K51M-500D

0.190″

6″ x 6″ A60M 1-3/4″~2-1/2″ K51M-600

0.160″

Swing Clear 4-1/2″ x 4-1/2″ A45M5 1-3/4″ K51L-SWRH-450

0.134″

5″ x 4-1/2″ n/a 1-3/4″ K51L-SWRH-500

0.146″

get a quote
download table
SHOP ONLINE

2. Configuration

DOWNLOAD
Door Size Product SKU
Full mortise 4.5*4.5
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90°Hold-open
1-3/4″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-450-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-450-B3

H

3 hinges/door (DS.HA.SA1)
K51M-450-C3 M 3 hinges/door (SB.SA.SA1)
K51M-450-D3 H 3 hinges/door (DS.HA.SB)
1-3/4″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-450-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-450-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/4″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-450-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-450-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

DOWNLOAD
Door Size Product SKU
Full mortise 4*4
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90° Hold-open
1-3/8″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-400-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-400-B3

H

3 hinges/door (DS.HA.SA1)
K51M-400-C3 M 3 hinges/door (SB.SA.SA1)
K51M-400-D3 H 3 hinges/door (DS.HA.SB)
1-3/8″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-400-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-400-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/8″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-400-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-400-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

DOWNLOAD
Door Size Product SKU
Full mortise 5*5
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90°Hold-open
1-3/4″ ~ 2-1/4″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-500-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-500-B3

H

3 hinges/door (DS.HA.SA1)
K51M-500-C3 M 3 hinges/door (SB.SA.SA1)
K51M-500-D3 H 3 hinges/door (DS.HA.SB)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-500-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-500-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-500-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-500-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

DOWNLOAD
Door Size Product SKU
Full mortise 5*5
FEATURES
Door Range ≤ 120°
Closing Type

 Mechanical Only – M
 Hydraulic Hybrid – H

Hinge Qty

Hinge Type

Finish
Self-closing Fluid Motion 90°Hold-open
1-3/4″ ~ 2-1/4″
< 7’-0 x 4′-0
≤ 260 lbs
K51M-500D-A3 M 3 hinges/door (SA.SA.SA1) Stocking

US32D-630-Satin Stainless Steel
Matching-US19-631-Flat Black – Powder coating

Special Order

Matching-US10B-695-Dark Satin Bronze – Powder coating
Matching-US4-731-Satin Brass – Physical vapor deposition

K51M-500D-B3

H

3 hinges/door (DS.HA.SA1)
K51M-500D-C3 M 3 hinges/door (SB.SA.SA1)
K51M-500D-D3 H 3 hinges/door (DS.HA.SB)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 260 lbs
K51M-500D-C4 M 4 hinges/door (SA.SB.SA.SA1)
K51M-500D-D4 H 4 hinges/door (DS.SB.HA.SA1)
1-3/4″ ~ 2-1/4″
< 8’-0 x 4′-0
≤ 330 lbs
K51M-500D-A4 M 4 hinges/door (DS,SA,SA,SA1)
K51M-500D-B4 H 4 hinges/door (DS.SA.HA.SA1)


1. We provide additional door stop ( at 90°) features for all models. Email to request a quotation.
2. Learn more about Waterson hinge design (SA,SA1,SB,…)
3. Learn more about mechanical or hydraulic hybrid closing types, or watch video
4. Please contact us directly concerning doors over the above specifications.

Specification

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
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