American Mortise Lock Cylinders: 1-5/32"-32 UNS Threading & Cam Tailpiece Selection
Engineering Overview: Technical specifications for North American mortise cylinders featuring 1-5/32"-32 UNS threaded solid brass bodies and interchangeable rear drive cams.
Technical & Engineering Specifications
| Standard | ANSI/BHMA A156.5 Grade 1 |
|---|---|
| Cam Types | Yale Standard, Adams Rite, Cloverleaf |
| Body Material | Solid Extruded H59 Brass |
| Standard Thread | 1-5/32 inch - 32 UNS |
| Standard Lengths | 1-1/8 in to 1-3/4 in |
Threaded Body Standard
American mortise cylinders feature a cylindrical solid brass body threaded to 1-5/32"-32 UNS standard, screwing directly into commercial mortise lockcases. Standard lengths range from 1-1/8" (28.5 mm) to 1-3/4" (44.5 mm).
Interchangeable Drive Cams
Unlike fixed Euro cams, American mortise cylinders utilize rear interchangeable cams secured by twin screws:
- Standard Yale Cam: Straight driving arm for commercial deadbolts.
- Adams Rite Cam: Slotted drive arm for narrow-stile storefront aluminum locks.
- Cloverleaf Cam: Multi-point specialty deadlatch mechanisms.
Frequently Asked Engineering & Selection Questions
Q1: What is the standard thread on US mortise cylinders?
The universal standard thread is 1-5/32"-32 UNS, allowing direct installation into ANSI commercial mortise lockcases.