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Sargent 4875 Single Cylinder Mortise Deadlock — Commercial Grade, LA Keyway
The Sargent 4875 is a heavy-duty, single cylinder mortise deadlock from Sargent's 4870 Series — engineered for demanding, high-traffic commercial applications where maximum bolt strength and long-term reliability are non-negotiable. Built around a laminated stacked steel deadbolt, the 4875 delivers the forced-entry resistance required in institutional, healthcare, educational, and government facilities.
As a single cylinder mortise deadlock, the 4875 is operated by key from the outside using the LA keyway. This configuration provides controlled outside access with straightforward interior egress, making it a proven solution for perimeter doors, storeroom applications, and secured corridors where a deadbolt-only function (no latch) is specified.
Function Overview — Single Cylinder Mortise Deadlock: A deadlock-only mortise function means the lock body operates the deadbolt exclusively — there is no latch bolt. The outside cylinder projects and retracts the dead bolt by key. This function is ideal for doors requiring positive, key-controlled dead-bolt security without a passage latch, such as utility rooms, electrical rooms, storage areas, and secondary egress points where the door must be positively locked.
Key Benefits
- Laminated stacked steel deadbolt — resists sawing, prying, and forced-entry attacks common in high-security commercial environments
- Mortise body construction — installs within the door edge for a clean, flush profile and superior structural integration versus surface-mounted locks
- Single cylinder / LA keyway — compatible with Sargent master key systems; supports keyed-alike and master-keyed configurations for facility-wide key control
- High-traffic durability — 4870 Series construction meets the performance demands of schools, hospitals, government buildings, and commercial office facilities
- Sargent 40 Series mortise cylinder compatibility — solid brass cylinder available in multiple lengths and finishes; 6-pin standard with 7-pin option available for enhanced security
Typical Applications
- School and university perimeter and interior secured doors
- Hospital and healthcare facility utility and supply rooms
- Government and municipal buildings requiring positive dead-bolt security
- Commercial office storerooms, IT rooms, and electrical/mechanical spaces
- High-traffic institutional facilities requiring mortise deadlock reliability
Technical Details
| Feature | Details |
|---|---|
| Manufacturer | Sargent (ASSA ABLOY) |
| Series | 4870 Series Mortise Deadlock |
| Model | 4875 |
| Lock Type | Single Cylinder Mortise Deadlock (deadbolt only — no latch) |
| Cylinder Configuration | Single cylinder (outside key operation) |
| Keyway | LA Keyway |
| Deadbolt Construction | Laminated stacked steel |
| Lock Body | Mortise (installs in door edge pocket) |
| Cylinder Type | Sargent 40 Series mortise cylinder (solid brass, 1-5/32" / 29mm diameter) |
| Pin Configuration | 6-pin standard; 7-pin available |
| Recommended Applications | Schools, hospitals, government buildings, high-traffic commercial facilities |
| Product Category | Commercial Mortise Deadbolt / Dead Lock |
Need a comparable mortise deadlock specification or an alternate finish or keyway option? Contact our commercial hardware team for product guidance, keying options, and volume pricing.
The 4870 Series Deadlock has several reference centerlines - use caution and be exact when specifying the location above finish floor - All three of these referenced dimensions are a different location:
- Centerline of Cylinder
- Centerline of Strike
- Centerline of Lock Body (or Lock Front)
| Finish with BHMA code | 626 - US26D Satin Chrome or 613E - US10BE Oil Rubbed Bronze Equal or 605 - US3 Polish Brass or 612 - US10 Satin Bronze or 625 - US26 Polish Chrome |
| Sargent Cylinder Options | KD - LA Kwy Keyed Different or SC - Schlage C Kwy 0 Bitted or 60 prefix - Sargent LFIC Prep Less Core or 70 prefix - Best/Falcon SFIC Prep Less Core or LC - Less Sgt Cylinder |
| Brand | Sargent |
| Deadbolt Function | Single Cylinder w/Thumbturn |
| Deadlock Grade | Grade 1 - Hv Dty |
| Series | Sargent - 4870 Series |
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