Full Mortise Plain Bearing Hinges

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General Information:

Basic Information

Types of Hinges:
  • Full Mortise - Both leaves are mortised. One leaf on the frame and one on the door.
  • Half Mortise - One leaf is mortised to the door and the other is surface applied to the frame.
  • Full Surface - Both leaves are applied to the surface. One to the door and the other to the frame which may be a metal core door or hollow metal door with channel iron frame.
  • Half Surface - One leaf is mortised to the frame and the other is surface applied to the face of the door which may be a wood door with wood frame or a metal core door with hollow metal frame.
Hinge Size Configuration:

Hinges are measured by its height and its width. The first dimension is the height and the second is the width. Width is measured provided that the hinge is in the open position as shown in the figure below

Determining the number of hinges needed:
Generally there should be 1 hinge for every 30" of door height. Refer to table below for quick reference.

Height of Door Number of Hinges
60" or below 2
61" - 90" 3
91" - 120" 4

Determining the height of hinges needed:
Guidelines for Hinge Height Selection
Door Weight (lbs) Door Width Door Thickness Full Mortise Hinge Height
75 32" 1 3/8" 3 1/2"
75 36" 1 3/8" 4"
150 32" 1 3/8" 4"
150 36" 1 3/8" 4"
150 32" 1 3/4" 4 1/2"
150 36" 1 3/4" 4 1/2"
175 32" 1 3/8" 5"
175 36" 1 3/8" 5"
175 36" 1 3/4" 5"
175 48" 1 3/4" 5"
230 36" 1 3/8" 6"
230 48" 1 3/8" 6"
230 36" 1 3/4" 6"
230 48" 1 3/4" 6"

Determining handing:

Some hinge applications require correct hinge handing. It is therefore necessary to distinguish what type of hinge handing a particular application may require. Shown in the illustration below, the suffix L.H. (left hand) and R.H. (right hand) would classify their handing.

The hand of a hinge is determined from the outside of the door to which it is applied. This is usually the locked side. When standing outside, if the door opens away to the right, it requires a right-hand hinge also referred to as RH. If it opens away to the left, then it requires a left-hand hinge also termed as LH.

When standing outside, if the door opens towards the right, it requires a lefthand hinge, also referred to as right hand reverse bevel or RHRB. If it opens towards the left, it will require a right-hand hinge, also referred to as left hand reversed bevel or LHRB.

Guidelines for Estimating Door Weight:
(Weight in Pounds per Square Foot)

Door Thickness 1 3/8" 1 3/4" 2" 2 1/4" 2 1/2"
Hollow Metal 18 gauge 4.3 4.6
Hollow Metal 16 gauge 5.4 5.8
Hollow Metal 15 gauge 6.2 6.5
Hollow Metal 14 gauge 7.0 7.3
Hollow Metal 13 gauge 8.3 8.7
Hollow Metal 12 gauge 9.9 10.2
Hollow Metal 11 gauge 11.2 11.6
Hollow Metal 10 gauge 12.8 13.0
Ash 4.5 5.3 6.0 6.8 7.5
Birch 3.8 4.3 5.0 5.6 6.3
Fir 3.0 3.5 4.0 4.5 5.0
Mahogany 4.5 5.3 6.0 6.8 7.5
Oak 6.0 7.3 8.0 9.0 10.0
White Pine 3.0 3.5 4.0 4.0 5.0
Mineral Core 4.0

Types of Finishes:

All steel and brass material hinges can be plated to match the available finishes that are listed in the American National Standards Institute or ANSI, standard ANSI/BHMA A156.18 Materials and Finishes.

Anti-rust finishes:

When using steel based materials hinges, special finishing procedures can be done which will improve and add protection to the product. A nickel undercoat may be applied prior to plating. But although this will give added protection and make it rust resistant, it is still not considered rust proof. Stainless steel or brass which is a non-ferrous material may be used if a true rust-resisting hinge is needed.

Determining the width of hinges needed:

WIDTH = DT - HB x 2 + CR


If the result of the formula above would correspond to a non standard hinge, then go to the next larger hinge width.


For doors 2 1/4" thick and below, 1/4" (6.4 mm) backset is recommended.
For doors over 2 1/4", 3/8" (9.5 mm) backset is recommended.

Selecting the Proper weight and Bearing Type:

Standard Weight - Plain Bearing
Standard Weight - Ball Bearing, Concealed bearing
Heavy Weight - Ball Bearing, Concealed bearing

Considerations in determining Weight and Bearing type:

1) Weight of Door
2) Frequency of Use
3) Frame
4) Door Hardware

Always use ball bearing or concealed bearing hinges for doors with door closers and in all fire rated openings. Heavy Weight doors and high frequency doors should use heavy weight ball bearing or concealed bearing hinges.

Use ball bearing or concealed bearing hinge with spring hinges.

Guidelines for Frequency of Door Usage:

Build Type Daily Usage Yearly Usage Hinge Type
High Frequency/ Heavy Weight Door Heavy Weight
Large Department Store Entrance 5,000 1,825,000
Hospital Corridor and Surgical Doors 5,000 1,825,000
Large Office Building Entrance 4,000 1,460,000
School Entrance 1,250 356,200
School Restroom 1,250 356,200
Office Stairwell 500 182,500
Office Building Restroom 400 118,000
Medium Frequency/ Medium Weight Door Standard Weight
School Corridor Door 100 36,500
Hospital Consultation Rooms 100 36,500
Office Building Corridor Door 80 15,000
Store Restroom 60 15,000
Storage Room 50 18,250
Low Frequency/ Light Weight Door Plain Bearing
Residential Entrance 30 10,950
Interior Residential 20 7,300

Minimum Architectural Hinge Requirements:

Grade 1: 2,500,000 Heavy Weight Ball and Concealed Bearing
Grade 2: 1,500,000 Standard Weight Ball & Concealed Bearing
Grade 3: 350,000 Light Weight Plain Bearing

Type of materials:

Steel - Durable, has great strength but is highly corrosive. Rusting will result if the material is used in an uncontrolled environment, like places near the sea where the atmosphere is salty. Steel is best to use in a stable contained surroundings such as inside a building where the temperature and humidity are controlled. Steel hinges can be used on listed fire rated or labeled door openings.

Stainless Steel - This material is also durable and has great strength, but does not corrode like steel. This is best to use on highly corrosive areas. A 316 grade stainless steel or clear coat over 304L is recommended. Stainless steel can also be polished to a satin or bright finish. Stainless steel hinges can also be used on listed fire rated or labeled door openings.

Brass - Like stainless steel, brass is also non-corrosive and rust resistant. And although brass has less strength compared to steel and stainless steel, it is very decorative. It is often used in applications where appearance is taken into consideration over strength as it can be polished and plated in various finishes. But due to its low melting point, brass may not be used on listed fire rated door openings.

Electrified Hinges:

The Electrified Hinge made door wiring easy, safe and reliable. Power can now be transferred from the frame into the door either exposed or concealed.

With the introduction of electrified hinges, we are now able to monitor the position of the door, transfer power and incorporate both functions into a single hinge. More so, we now have the ability to electrify other hardware items such as exit devices, electric strikes and electrified locks.

Full mortise hinges are highly recommended for modification purposes. However, monitoring can be supplied on a half surface hinge if the need arises. It is also recommended that the Center Hinge Location be used with all electrically modified hinges.

The maximum voltage that is allowed in electrified hinges is 48 volts. Higher voltage is not allowed because of potential dangers. The current (amperes) should also be taken into consideration.

4, 6 and 8 wire available on all standard weight, heavy weight and concealed ball bearing hinges in all sizes. Specify Hinge.


Prefix ELE + (No. of wires) before ITEM #
ELE4: 4 Wires - 26 gauge · 1A@24V (per pair)
ELE6: 6 Wires - 26 gauge · 1A@24V (per pair)
ELE8: 8 Wires - 28 gauge · 1A@24V (per pair)


Prefix ELELR + (No. of wires) before ITEM #
ELELR4: 2 Wire -18 gauge, 5A (16A in-rush for 300 ms.) + 2 Wire -26 gauge
ELELR6: 2 Wire -18 gauge, 5A (16A in-rush for 300 ms.) + 4 Wire -28 gauge
ELELR8: 2 Wire -18 gauge, 5A (16A in-rush for 300 ms.) + 6 Wire -28 gauge