BEST 1E-74 Mortise Cylinder Housing - 1-1/4 Inch for 6 or 7 Pin Cores

The BEST 1E74 is the standard mortise cylinder housing for BEST small format interchangeable core systems. It's machined from solid brass or bronze bar stock to a 1-1/4 inch standard length and 1-5/32 inch diameter, and it accepts any BEST 1C Series 6 or 7 pin SFIC core. The housing fits mortise locks, exit devices, exit device trims, and padlocks wherever a BEST interchangeable core system is in use. It ships less core. The core must be ordered separately, which is standard practice for institutional keying systems where cores are managed and swapped centrally.

What the 1E74 housing does and why core is ordered separately

In a BEST interchangeable core system, the housing and the core are two separate components. The housing is the permanent part that mounts in the lock or device. The core is the removable cylinder that carries the key cuts and the master key system programming. When a tenant moves out, an employee loses a key, or an access group changes, the core drops out with a control key and a new core drops in. No locksmith visit. No disassembly of the hardware. No rekeying. The lock body and housing stay in place permanently.

That's the operational reason the 1E74 ships less core. Facilities managing large building systems typically order housings and cores separately to match cores to specific keying groups, grand master systems, or access tiers. The housing itself is the same across applications. What changes is which core goes in it. The RP3 ring package is included with every housing and allows the cylinder to be adjusted for different door preparations and lock body types without additional hardware.

Cam selection and length options for the 1E74

The cam is the component that determines which lock body or exit device the 1E74 works with, and selecting the wrong cam is the most common ordering mistake on this housing. The C4 standard straight cam covers most mortise lock applications and is the most frequently specified option. The C161 cloverleaf cam is for mortise locks requiring cloverleaf tailpiece engagement. The C181 Adams Rite MS cam is specified for Adams Rite MS series mortise locks and storefront applications. The C208 straight cam covers exit device outside trim cylinders. The C258 offset cam handles offset mortise applications and specialty hardware. The C265 serves specific lock body variations. Confirm the cam type required by the installed lock or exit device before ordering.

Standard cylinder length is 1-1/4 inches. For installations requiring more projection, the 1E74 is available in 1-3/8 inch (suffix -22), 1-1/2 inch (-24), 1-5/8 inch (-26), and 1-3/4 inch (-28) lengths at additional cost. Length is determined by the door preparation and the depth of the lock body mortise pocket, not by preference. The full model string combines the housing, cam, ring package, and finish: for example, 1E74C4RP3626 is the standard straight cam with RP3 ring package in satin chrome.

Construction, finish options, and security detail

The 1E74 is machined from brass or bronze bar stock, not cast. Machined construction produces tighter dimensional tolerances than casting, which matters when the housing needs to receive cores consistently across hundreds of installations on a large campus or building complex. Corrosion resistance is inherent to the alloy. Available finishes are 605 bright brass, 612 satin bronze, 613 oil rubbed bronze, and 626 satin chrome.

A diagonal set screw mounts in the cylinder wall and locks the cylinder securely in position when tightened, preventing rotation under forced entry attempts. This is a standard security feature on the 1E74 across all finish and cam configurations. Browse the complete range of BEST housings available on this site, or explore the broader IC housing category for compatible options across other interchangeable core systems. For conventional mortise cylinders without interchangeable core prep, those are available separately.

Confirm your cam type, cylinder length, and finish before ordering. The part number appears in catalogs as 1E74, 1E-74, 1E+74, and 1/74 — all refer to the same housing.