Commercial 6 Inch Door Hinges
Stainless Steel Self Closing
Waterson’s commercial 6 inch door hinges are durable and versatile, designed for high-traffic areas and fire-rated doors. Fully adjustable, these hinges provide precise control over closing speed and backcheck, ensuring smooth operation. Made from high-quality materials, the 6″ hinges are built to withstand frequent use and comply with ADA standards for speed control, closing force, and door clearance.
Most Frequently Asked Questions
Speed control, low opening force, weather resistance, hold open, heavy-duty, and more. Learn about our 7 innovative features.
Read about the differences of Mechanical Only Self Closing and Hydraulic Hybrid Soft Close differences.
Waterson Commercial 6 Inch Hinges Type Table
Each 6 inch heavy duty hinge has two distinct functions, one adjusted from the hinge top, and the other from the bottom. Note: Waterson hinges are non-handed and can be inverted.
| Hinge TYPE | MECHANISM | FUNCTIONS |
| DS | Top: Spring Power Bottom: Spring Power |
Dual door closing force |
| SA1 | Top: Spring Power Bottom: Mechanical Friction |
Door closing force & latch speed control |
| SA | Top: Spring Power Bottom: Mechanical Friction |
Door closing force & swing speed control |
| SB | Top: Spring Power Bottom: Hold-open Feature |
Door closing force & hold the door at 85°+/-5° |
| HA | Top: Hydraulic Damping Bottom: Mechanical Friction |
Both swing & latch speed control depends on settings |
| HS | Top: Hydraulic Damping Bottom: Spring Power |
Door closing force & both swing & latch speed control depends on settings |
| Door Size | Product SKU Full mortise 6*6 |
FEATURES Door Range ≤ 120° |
Closing Type
Mechanical Only – M |
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-600-A3 | ● | M | 3 hinges/door (SA.SA.SA1) | In Stock
Special Order
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| K51M-600-B3 | ● | ● | H | 3 hinges/door (DS.HA.SA1) | |||
| K51M-600-C3 | ● | ● | M | 3 hinges/door (SB.SA.SA1) | |||
| K51M-600-D3 | ● | ● | ● | H | 3 hinges/door (DS.HA.SB) | ||
| 1-3/4″ ~ 2-1/4″ < 8’-0 x 4′-0 ≤ 260 lbs |
K51M-600-C4 | ● | ● | M | 4 hinges/door (SA.SB.SA.SA1) | Other Options | |
| K51M-600-D4 | ● | ● | ● | H | 4 hinges/door (DS.SB.HA.SA1) |
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| 1-3/4″ ~ 2-1/4″ < 8’-0 x 4′-0 ≤ 330 lbs |
K51M-600-A4 | ● | M | 4 hinges/door (DS,SA,SA,SA1) | |||
| K51M-600-B4 | ● | ● | H | 4 hinges/door (DS.SA.HA.SA1) | |||
Please contact us directly concerning doors over the above specifications.
- We provide additional door stop ( at 90° or 120°) features for all models.
- Door Stop Options: A) two hinge set requires one door stop; B) three-four hinge set requires two door stops. Click here to see the drawing.
Various businesses, including hotels, schools, and retail stores, choose Waterson self-closing door hinges for durability, design, and sustainability.
Code Compliance
| ANSI/BHMA A156.7 Full Mortise Template | ||
| ANSI/BHMA A 156.17 Grade 1 Single Acting Hinge | ||
| ANSI/ICC A117.1 ADA Accessibility | ||
| UL Listed for ANSI/UL 10B and UL 10C, CAN/ULC S104 up to 3 hours | ||
| NFPA 80 National Fire Protection – Fire Door Assembly | ||
| NEPA101 National Fire Protection – Self Closing Device | ||
| ANSI/BHMA A 156.18 Finishes |
Waterson 6 Inch Door Hinges are easily adjustable and re-adjustable simply with two Allen wrenches in just minutes. Follow our procedure to get the optimal closing experience.
| Installation Guide | Click Here | ||
| Set A3 ( SA.SA.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set B3 ( DS.HA.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set C3 ( SB.SA.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set D3 ( DS.HA.SB ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set A4 ( DS.SA.SA.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set B4 ( DS.HA.SA.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set C4 ( SB.SA.SA1.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
| Set D4 ( DS.SB.HA.SA1 ) – Waterson self-closing hinge adjustment manual | Download | ||
How to Adjust
Please note that Waterson offers a variety of product codes including K51M, K51SWRH, K51P, K51L, and K51GG, among others. However, the adjustment process remains consistent and is categorized based on codes A, B, C, and D. Below are the videos on how to adjust:
K51M-A3 (SA.SA.SA1)
K51M-B3 (DS.HA.SA1)
K51M-C3 (SB.SA.SA1)
K51M-D3 (DS.HA.SB)
Choose either mechanical self-closing spring-loaded hinges or hydraulic hybrid soft-close ones depending on your particular closing needs.
Code Compliant
ADA Opening Force: No more than 5 lbs
ADA Closing Speed: At least 5 seconds to go from 90° to 12°
No More In-Floor Installation
Well-controlled Closing Speed