Hager 1279 3-1/2" x 3-1/2" Plain Bearing, 5 Knuckle Steel Hinge

Hager 1279 3-1/2" x 3-1/2" Plain Bearing 5 Knuckle Steel Hinge, Fire

The Hager 1279 3-1/2 inch x 3-1/2 inch Plain Bearing 5 Knuckle Steel Hinge is a standard weight, full mortise hinge made for commercial door openings that see regular daily use. It uses a plain bearing design with a 5 knuckle barrel to support smooth door swing and steady alignment. The hinge is built from steel with a steel pin and uses a non rising removable pin with a button tip and plug for a clean, finished look.

This model is commonly selected for medium-weight doors or non-cycling doors. If your opening uses a door closer, many specification guides recommend upgrading to a ball-bearing hinge.

For fire door openings, hardware must match the door and frame listing and local code requirements. This hinge line is often specified in commercial openings, but always match the hinge type and options to the labeled assembly requirements.

Function 

ANSI: A8133 - It supports the door and lets it swing while keeping the door aligned at the frame, using a durable steel build and a plain bearing design.

Applications 

It is used on medium weight doors or doors that need low frequency service in commercial and light industrial openings.

Best for 

• Medium weight interior or exterior commercial doors

• Doors that open and close a moderate number of times per day

• Projects needing a standard full mortise hinge footprint

• Door and frame setups using a removable pin hinge design

It helps by 

• Keeping the door steady and aligned at the hinge side

• Supporting smooth swing with a plain bearing design

• Allowing pin removal for easier door takeoff during service

• Providing a commercial grade hinge in a common 3-1/2 inch size

Key highlights

• Full mortise commercial hinge in a common 3-1/2 inch size

• Plain bearing, standard weight build for many general duty openings

• 5 knuckle design with steel pin

• Non rising removable pin with button tip and plug

What’s included 

• (1) Hager 1279 hinge, sold individually

• Screw pack as listed for this product (wood screws and machine screws included per listing)

Key features 

• Full mortise pattern

• Plain bearing

• 5 knuckle barrel

• Steel with steel pin

• Non rising removable pin

• Button tip and plug

Keying options 

• Not applicable, this item is a hinge and does not use keyed cylinders or keys

Warranty 

• Hager lists a lifetime warranty that includes architectural hinges, with stated exceptions and terms in their warranty documents

Specifications 

• Hinge size: 3-1/2 inch x 3-1/2 inch (89 mm x 89 mm)

• Hinge type: Full mortise

• Knuckles: 5

• Bearing: Plain bearing

• Material: Steel with steel pin

• ANSI: A8133

• Pin: Non rising removable pin with button tip and plug

• Gauge of metal (3-1/2 x 3-1/2 listing): 0.119

• Hole count (3-1/2 x 3-1/2 listing): 6

• Screw sizes (as listed for this size): Wood 1 inch x 9, Machine 1/2 inch x 10-24

• Common finishes offered (may vary by selection): LS, H2H, USP, US3, US4, US10, US10A, US10B, US15, US26, US26D

Related Categories

• Five Knuckle Plain Bearing