Provide secure, key-controlled locking for the inactive leaf of paired wood doors with the Adams Rite 1877 Cylinder-Operated Flushbolt.

Designed as an alternative to conventional flip-lever flushbolts, the 1877 gives building management positive key control over the inactive door leaf and helps prevent unauthorized or accidental locking.

The 1877 can be installed at either the header or threshold and uses a stainless-steel hex bolt operated by a standard mortise cylinder or thumbturn.

Key Features

• Genuine Adams Rite / ASSA ABLOY

• Model 1877

• Cylinder-operated flushbolt

• Designed specifically for paired wood doors

• Intended for the inactive door leaf

• Provides key-controlled operation

• Helps prevent casual or unauthorized locking

• Can be installed at:

  • Header

  • Threshold

  • Both top and bottom

• 3/8" stainless-steel hex bolt

• 11/16" bolt throw

• 360° key or thumbturn operation

• Fixed 1-1/4" backset

• Standard 13-1/2" cylinder height

• Special cylinder heights available

• Mortise cylinder can operate from one or both sides

• Compatible with Adams Rite MS® cam

• Strike included

• Multiple architectural finishes

Designed for Paired Wood Doors

The 1877 is specifically designed for the:

Inactive Leaf of Paired Wood Doors

Traditional paired wood doors often use manually operated flushbolts.

The 1877 replaces the conventional flip lever with a cylinder-controlled mechanism, allowing authorized personnel to determine when the inactive leaf can be locked or unlocked.

Key-Controlled Inactive Leaf

Using a keyed cylinder instead of a manual lever helps prevent unauthorized users from casually:

• Locking the inactive leaf

• Unlocking the inactive leaf

• Changing the operating condition of the paired opening

This is especially useful in:

• Schools

• Government facilities

• Institutional buildings

• Commercial properties

• Controlled-access openings

Header or Threshold Installation

The 1877 may be installed in either orientation.

Header Installation

The bolt projects upward into the header.

Threshold Installation

The bolt projects downward into the threshold.

Top & Bottom Installation

For maximum mechanical security, Adams Rite recommends using flushbolts at both the top and bottom of the inactive leaf, particularly when paired with an appropriate two-point or MS® locking system on the active leaf.

360° Operation

A complete:

360° turn of the key or thumbturn

projects or retracts the flushbolt.

The key can only be removed when the bolt is in a positively:

• Locked position

• Unlocked position

This helps ensure that the bolt is either fully extended or fully retracted before the key is removed.

Stainless-Steel Bolt

The 1877 uses a durable:

3/8" Hexagonal Stainless-Steel Bolt

Bolt Throw

11/16"

The bolt engages the supplied strike at the header or threshold.

1-1/4" Backset

The Adams Rite 1877 has one standard backset:

1-1/4"

Always verify the wood-door preparation before ordering.

The 1877 should not be ordered based solely on its similarity to the 1870 or 1870HM.

Standard 13-1/2" Cylinder Height

The standard distance from the:

Cylinder Centerline to Door End

is:

13-1/2"

Other cylinder heights are available by special order.

Verify the required cylinder position before door preparation or ordering a special-length unit.

Mortise Cylinder Compatibility

The 1877 accepts a standard:

1" Long x 1-5/32" Diameter Mortise Cylinder

with an:

Adams Rite MS® Cam

Compatible examples include:

• Adams Rite 4036 Mortise Cylinder

• Adams Rite 4066 Thumbturn

The lock can accept a cylinder from:

• One side

• Both sides

depending on the required configuration.

Cylinder and thumbturn are sold separately.

Lock Case

The lock case is constructed from steel with corrosion-resistant plating.

Case Dimensions

Width: 1"
Height: 6"
Depth: 1-29/32"

Armored Faceplate

The 1877 uses an extended armored faceplate measuring:

1-1/4" Wide x 15-5/8" High

This larger faceplate is specifically designed for the wood-door application.

Strike Included

A matching strike measuring approximately:

2-1/4" x 15/16"

is supplied with the 1877.

This provides the receiving point for the stainless-steel flushbolt.

Finish Options

Available finishes include:

• 313 – Dark Bronze Anodized

• 628 – Clear Anodized Aluminum

• 626 / US26D – Satin Chrome

Finish availability should be verified when ordering.

Common Applications

Ideal for:

• Paired wood doors

• Commercial wood doors

• Double wood-door openings

• Schools

• Office buildings

• Government facilities

• Institutional buildings

• Healthcare facilities

• Commercial buildings

• Controlled-access openings

Product Specifications

Brand: Adams Rite
Model: 1877
Product Type: Cylinder-Operated Flushbolt
Application: Inactive Leaf of Paired Wood Doors
Bolt Material: Stainless Steel
Bolt Shape: Hexagonal
Bolt Size: 3/8"
Bolt Throw: 11/16"
Operation: 360° Key or Thumbturn
Backset: 1-1/4"
Standard Cylinder Height: 13-1/2"
Cylinder: 1" x 1-5/32" Mortise Cylinder
Cylinder Cam: Adams Rite MS® Cam
Case Material: Corrosion-Resistant Plated Steel
Case Size: 1" x 6" x 1-29/32"
Faceplate: 1-1/4" x 15-5/8"
Strike: 2-1/4" x 15/16" Included
Cylinder Included: No
Shipping Weight: Approx. 2 lb.

Standard Package

The standard package includes:

• 1 Adams Rite 1877 Flushbolt Mechanism

• Actuator arm

• Rod and bolt assembly

• Stainless-steel bolt guide

• Matching strike

• Mounting screws

• Installation instructions

Not Included Unless Specifically Stated

• Mortise cylinder

• Thumbturn

• Additional flushbolt

• Door

• Frame

• Additional trim

• Installation labor

Important Ordering Information

Before ordering, verify:

• 1877 model

• Wood-door application

• Inactive-leaf installation

• Header or threshold mounting

• Top, bottom, or both

• 1-1/4" backset

• Standard or special cylinder height

• Required finish

• Mortise cylinder configuration

• MS® cam requirement

• Existing door and strike preparation

1870 vs. 1870HM vs. 1877

1870

For narrow-stile aluminum doors

Backsets:

• 31/32"

• 1-1/8"

1870HM

For hollow metal doors

Backset:

• 1-1/4"

1877

For wood doors

Backset:

• 1-1/4"

Important

Although all three products provide similar cylinder-controlled flushbolt operation, they are designed for different door constructions and should not be considered interchangeable.