Vertical Bolt Only | Bottom Rail Mount | Zinc-Plated Steel | Individually Boxed

Secure ultra-narrow stile and bottom-rail commercial door applications with the Adams Rite MS1861-01-603-IB MS® Bottom Rail Deadlock.

Designed for openings where there is insufficient vertical stile space for a conventional deadlock, the MS1861 mounts horizontally inside the bottom rail of the door. The -01 configuration provides a single vertical bolt that projects downward into the threshold for positive mechanical locking.

This configuration features a 603 zinc-plated steel finish and is supplied individually boxed with mounting screws.

Key Features

• Genuine Adams Rite MS1861 Series

• Part Number: MS1861-01-603-IB

• One-point bottom rail deadlock

• Vertical bolt only

• Horizontally mounted lock body

• Designed for doors with limited stile space

• 3/8" diameter vertical threshold bolt

• 13/16" vertical bolt throw

• Stainless steel threshold bolt

• 603 Zinc-Plated Steel

• IB – Individually Boxed

• Mounting screws included

• Cylinder or thumbturn sold separately

• Commercial-duty MS® locking mechanism

• Ideal for storefront and specialty commercial door applications

Bottom Rail Design

The MS1861 is specifically designed to lie horizontally inside the bottom rail rather than vertically inside the door stile.

This makes it especially useful for:

• Ultra-narrow stile aluminum doors

• Tempered glass doors with bottom rails

• Commercial doors with insufficient vertical space for a standard deadlock

• Specialty storefront door configurations

Adams Rite does not recommend the MS1861 for wood doors.

Vertical Bolt Only – MS1861-01

The -01 designation identifies the single-point configuration with vertical bolt operation only.

The vertical bolt projects downward into the threshold to secure the door.

Bolt Diameter: 3/8"
Bolt Throw: 13/16"

For applications requiring both vertical and horizontal locking, Adams Rite offers the separate MS1861-02 two-point configuration.

Cylinder Requirements

The MS1861 accepts a standard:

• 1" long mortise cylinder

• 1-5/32" diameter

• Adams Rite MS® cam

Compatible examples include the Adams Rite 4036 Mortise Cylinder or 4066 Thumbturn.

The lock accepts a cylinder from either or both sides.

Cylinder and thumbturn are sold separately.

Backset & Installation

For the MS1861-01 vertical-bolt-only configuration:

Minimum Cylinder Backset: Approximately 2-1/4"
Cylinder Centerline: 1-7/8" above bottom edge of door

For metal threshold installations, Adams Rite specifies a 7/16" drilled hole to receive the vertical bolt.

No separate manufactured strike is required for a typical metal threshold installation.

Lock Case Dimensions

Height: 1"
Length: 6"
Depth: 1-13/16"

The steel case features corrosion-resistant plating for commercial door applications.

Common Applications

• Aluminum Storefront Doors

• Ultra-Narrow Stile Doors

• Tempered Glass Door Bottom Rails

• Commercial Entrance Doors

• Retail Storefronts

• Office Buildings

• Shopping Centers

• Commercial Glass Entrances

• Institutional Buildings

• Replacement Bottom Rail Locks

Product Specifications

Brand: Adams Rite
Series: MS1861 MS®
Part Number: MS1861-01-603-IB
Product Type: Bottom Rail Deadlock
Locking Points: One
Bolt Configuration: Vertical Bolt Only
Vertical Bolt Diameter: 3/8"
Vertical Bolt Throw: 13/16"
Bolt Material: Stainless Steel
Finish: 603 Zinc-Plated Steel
Packaging: Individually Boxed
Minimum Backset: Approximately 2-1/4"
Cylinder: Mortise Cylinder with MS® Cam
Cylinder Included: No
Mounting Screws: Included
Fire Rated: No

Important

The MS1861 Series is not fire rated. Adams Rite also advises that the lock is not intended for wood-door installations.

Before ordering, verify:

• Door and bottom-rail construction

• Available rail depth

• Cylinder location

• Required backset

• Existing door preparation

• Threshold condition

• Cylinder or thumbturn requirements

• Need for optional tube spacers

Tube spacers may be required depending on the internal construction of the bottom rail and are available separately.