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PDQ #16 Mortise Cylinder x 1-1/8" in Brushed Chrome US26D with Cloverleaf Cam (I4201)
The PDQ 16 Series Mortise Cylinder is a professional-grade security component engineered specifically for high-performance integration with PDQ MR Series Mortise Locks. This 1-1/8" cylinder features the specialized I4201 Cloverleaf Cam, a critical hardware interface required for the precise operation of all locking functions within the MR Series chassis. Finished in US26D Satin Chrome over a solid brass housing, this cylinder provides an architecturally consistent and corrosion-resistant solution for high-traffic institutional and commercial entryways.
Designed for maximum reliability, the MR Series Cloverleaf Cylinder utilizes a 6-pin solid brass chamber (factory keyed to 5 pins) to offer superior physical protection against manipulation. Whether you are performing a new installation or a facility-wide security retrofit, this cylinder ensures a smooth, mechanical synchronization with the Grade 1 MR Series lock body. Its heavy-duty construction is built to match the 11 million cycle performance of the MR series, providing a lifetime of trouble-free operation in hospitals, schools, and government facilities.
- Cloverleaf cam #I4201(shown above)
Cloverleaf Cam (I4201) Function & Security Summary
The I4201 Cloverleaf Cam is the dedicated drive component for PDQ MR Series locks, designed to translate key rotation into secure bolt movement across dozens of diverse hardware functions.
- MR Series Optimization: This cam is the exclusive requirement for PDQ MR Series locking functions. Its unique "cloverleaf" profile provides the exact geometry needed to engage the MR Series' independent stainless steel retractor hubs.
- Positive Deadbolt Engagement: When used in functions with a deadbolt (such as the MR136 Dormitory or MR176 Privacy), the I4201 cam provides the mechanical leverage necessary to throw and retract the 1-inch stainless steel bolt with high precision.
- Security Deadlocking: The cam's design ensures that once the key is removed, the lock's internal anti-friction latchbolt and auxiliary deadlatch are fully engaged, preventing "loiding" or shimming of the lock from the exterior.
- Universal Function Support: PDQ's single-cam design means this one cylinder can be utilized across the entire MR Series range—from F07 Storeroom functions to F05 Classroom setups—simplifying inventory for facility managers.
Technical Specifications
| Feature | Details |
| Cylinder Model | PDQ 16 Series Mortise Cylinder |
| Length | 1-1/8" (Standard Sectional Trim Length) |
| Cam Profile | Cloverleaf Cam - I4201 (PDQ MR Style) |
| Finish | US26D (626) Satin Chrome / Brushed Chrome |
| Core Material | Solid Brass Housing and Plug |
| Keyway | Schlage C (SCC) Compatible |
| Pinning | 6-Pin Housing (Keyed to 5-Pins) |
| Keying | Keyed Different (KD) - 2 keys included |
| Compatibility | PDQ MR Series Grade 1 Mortise Locks |
Commercial Keyway Customization Solutions
While the Schlage C keyway is stocked for immediate shipment, this cylinder platform supports a wide array of architectural keyways to match existing facility master systems. If your facility utilizes a specific restricted or legacy key system, the following options are available via custom quote:
| Code | Keyway Manufacturer / Type | Code | Keyway Manufacturer / Type |
| CO6 | Corbin 60/59A1 | YA8 | Yale E1R |
| CL4 | Corbin L4 | GA | Yale GA |
| RUD | Russwin D1 | ARA | Arrow AR1 (Special Order) |
| SCE | Schlage E | FAL | Falcon E-R (Special Order) |
| SAL | Sargent LA | TA P | PDQ TA (Restricted) |
| RA-RC | Sargent RA-RC |
Engineered Solutions for Facility Maintenance
This PDQ Cloverleaf Mortise Cylinder addresses the specific technical and operational needs of commercial infrastructure:
- High-Frequency Performance: Engineered to match the Grade 1 Security standards of the MR series, this cylinder is designed for millions of rotations, preventing the common "key sticking" issues found in lower-quality hardware.
- Seamless Retrofit Capability: The 1-1/8" length is the architectural standard for doors with sectional (rose) trim. It allows for a flush, professional fit that resists prying and wrenching attacks.
- Master Key Integration: Provided in the standard Schlage C (SCC) keyway, this cylinder can be easily integrated into existing facility-wide master key systems. It also supports various other keyways (Corbin, Yale, Sargent) via special order to match legacy hardware.
- Corrosion & Chemical Resistance: The US26D finish is applied to a solid brass base, making it highly resistant to the harsh cleaning agents used in healthcare environments and the atmospheric moisture of exterior-facing doors.
- Maintenance Simplification: By utilizing a standard threaded housing (1.150" x 32 UNS), this cylinder can be replaced in seconds using a standard mortise wrench, reducing labor costs during re-keying or security updates.
| General - US Finishes | US26D - Satin Chrome or US3 - Polished Brass or US10B - Oil Rubbed Bronze |
| PDQ Cylinder Options | Schlage C Keyway or Schlage E Keyway or Sargent LA Keyway or Sargent RA-RC Keyway or Yale E1R Keyway or Yale GA Keyway or Russwin D1 Keyway or Corbin/Russwin L4 Keyway or Corbin 60 Keyway or Kwickset KW Keyway |
| Brand | PDQ |
| PDQ Cam Series | PDQ MR Series Cloverleaf Cam - I4201 |
| Cylinder Length | 1-1/8" |
| Key Length | 5 Pin, 6 Pin |
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