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Sargent Deadbolt Installation: The Marietta Owner’s Guide
We stock and install Sargent-compatible deadbolt hardware across Marietta, with most residential jobs running $195-$385 installed depending on grade and door prep. Same-day installation is available when you call before 2 p.m. Most Marietta homeowners discover a deadbolt problem when the key starts catching at 45 degrees, the thumb turn goes slack, or the bolt no longer throws fully into the strike.
Which Sargent Models This Applies To
Sargent deadbolts fall into three series you’re likely to find in Marietta homes and commercial spaces built or renovated since 1990. The 4870 series is the single-cylinder residential grade, identifiable by the small “SARGENT 4870″ stamp above the keyway. The 4875 double-cylinder variant adds an interior keyway, common on doors with glass panels in East Cobb subdivisions. The commercial 60 series, including the 63 and 65 grades, carries a thicker 1-3/8” backset housing and uses a larger diameter face bore than standard residential prep.
Here’s the compatibility gotcha: Sargent’s residential and commercial lines use different cylinder footprints. A 4870 cylinder will not seat properly in a 60-series housing, even though both are 1-inch diameter. We verify this on-site with a quick depth gauge measurement before quoting.
OEM Sargent parts ship with a limited lifetime finish warranty and brass internal components. Quality aftermarket equivalents, primarily from Major and Ilco, match Sargent’s 1.125″ cross-bore and 2-3/8″ or 2-3/4″ backset options at roughly 60% of OEM cost. For Marietta rental properties and commercial accounts near Barrett Parkway, we typically quote aftermarket with OEM available on request. The decision point is warranty transferability, not function.
Signs Your Sargent Deadbolt Installation Is Failing
- Key rotates but bolt doesn’t throw. The tailpiece connecting cylinder to bolt mechanism has sheared or slipped its set screw. On Sargent 4870s, this happens when the tailpiece angle was set incorrectly during a previous rekey, a mistake we see in about one in five Marietta homes with prior locksmith work.
- Thumb turn spins freely with no resistance. The actuator cam inside the housing has cracked. Sargent uses a zinc alloy cam in residential grades; after 8-12 years of Georgia humidity cycling, fatigue failure is predictable. We replace with a brass cam on repair jobs.
- Bolt extends but won’t retract without jiggling. The bolt face has deformed or the internal spring has lost tension. In Marietta’s clay-heavy soil zone, frame settlement often misaligns strike plates, which then hammer the bolt face with every closure until it mushrooms.
- Key works from one side only. Double-cylinder 4875s develop this when one cylinder’s tailpiece length is wrong for the door thickness. Standard Sargent tailpieces accommodate 1-3/8″ to 2″ doors; a 2-1/4″ solid-core door requires the extended tailpiece, which previous installers often omit.
- Visible corrosion on the exterior escutcheon. Georgia’s pollen season traps moisture against hardware. Sargent’s satin chrome finish holds up better than oil-rubbed bronze in shaded north-facing entries, which we see green-fail regularly in Marietta’s older neighborhoods near Whitlock Avenue.
Replacement Cost & What’s Included
Single-cylinder Sargent deadbolt installation in Marietta: $195-$285. Double-cylinder or commercial 60-series: $285-$385. The range reflects door prep condition, not hardware grade. A clean replacement into existing Sargent bore holes takes 35 minutes. Filling old misaligned holes, routing for a strike reinforcement box, or upgrading from a Kwikset/Schlage cross-bore to Sargent’s slightly tighter tolerance adds labor.
Every installation includes the deadbolt assembly, strike plate with 3″ screws, cylinder pinning to your key, and lubrication with Houdini Lock Lube. We leave you with a written scope, the documented photo record, and Haven Standard Clause 1 in effect: the price quoted on the phone is the price on the invoice. No dispatch fee, no “trip charge” added at the door. The 365-Day Done Right Promise covers all parts and labor.
DIY or Call Us?
You can safely verify your Sargent model number and door thickness yourself. Remove the interior thumb turn and read the housing stamp. Measure door thickness with a tape measure, not a ruler. Check whether the bolt throws smoothly with the door open, which isolates frame alignment from hardware failure.
Where DIY goes wrong: Sargent cylinders are under spring tension during removal. The cylinder retainer pin, if depressed without controlling the plug, launches the bottom pins into the housing. Reassembly then requires a pinning kit most homeowners don’t own. The tailpiece angle must be set to 90 degrees precisely; 85 or 95 degrees causes the failure mode described above within months. For the cost of a single botched cylinder, our installed price with warranty is the rational choice.
Call (762) 252-5919. We’ll confirm your model, quote a firm price, and schedule same-day if you need it.
FAQs
Residential Sargent 4870s last 12-18 years in Marietta’s climate before internal wear becomes functional. Exterior hardware on north-facing doors with poor overhang protection may show finish failure in 7-10 years. Call (762) 252-5919 for a free condition check - estimates are free.
Sometimes. A spun tailpiece or cracked cam can be replaced individually if the bolt housing isn’t worn. We diagnose this on-site; if repairable, we’ll quote that first. If replacement is necessary, the written price covers full removal and installation. Call (762) 252-5919 - we don’t charge to look.
Standard replacement into existing Sargent prep: 30-45 minutes. Door prep modification or frame reinforcement: 60-90 minutes. We quote the time estimate with the price, both in writing before work starts. Call (762) 252-5919 to schedule.
We carry Sargent 4870 and 4875 single and double-cylinder assemblies, 60-series commercial deadbolts, and both standard and extended tailpieces. For discontinued Sargent models, we source compatible hardware within 24 hours. The name on the invoice is the same name on the van. That’s the whole argument.
Written by Daniel Novak, Owner & Lead Technician, Novak Lock & Security Marietta at Novak Lock & Security Marietta, serving Marietta and nearby areas.