Cal-Royal SC8458 Grade 1 Class...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$349.96
Cal-Royal Cal-Royal SC8458 Grade 1, Classroom Security w/ Deadbolt and Auxiliary Latch Mortise Lockset, SS Lever, Satin Chrome SC8458-26D

Cal-Royal SC8458 Grade 1 Classroom Security Mortise Lockset with Deadbolt and Auxiliary Latch

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Model: SC8458 SS US26D
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$349.96
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Cal-Royal SC8458 Grade 1 Classroom Security Mortise Lockset with Deadbolt and Auxiliary Latch

The Cal-Royal SC8458 is a Grade 1 classroom security mortise lockset built for 1 ¾" (44.5mm) thick standard doors with a 2 ¾" (70mm) backset and a 3 7/8" (98mm) center-to-center dimension. This double-cylinder lockset combines a hardened stainless steel 1" throw deadbolt, a ¾" throw stainless steel anti-friction latch bolt, and a stainless steel non-handed auxiliary latch on a heavy-duty wrought steel, zinc dichromate plated lock case. Lock bodies are field reversible, so there's no need to specify handing when ordering, and the design conforms to ANSI A156.13, exceeding 1,000,000 test cycles.

Key Features

  • Door & Backset Compatibility: Designed for 1 ¾" (44.5mm) thick standard doors with a 2 ¾" (70mm) backset and 3 7/8" (98mm) center-to-center spacing.
  • Heavy-Duty Durability: Lock body conforms to ANSI A156.13 Grade 1 and exceeds 1,000,000 life cycles for long-term reliability in high-traffic classroom applications.
  • Heavy-Duty Construction: Wrought steel lock case with zinc dichromate plating, hardened stainless steel deadbolt with 1" throw, and one-piece stainless steel anti-friction, reversible tongue latch bolt with ¾" throw.
  • Interchangeable Core Compatibility: Accepts compatible 6 or 7-pin interchangeable cores from BEST, FALCON, and ARROW, in addition to the standard 6-pin solid brass "C" keyway.
  • Field Reversible Design: Lock bodies are fully reversible, eliminating the need to specify handing when ordering and simplifying stocking and installation.
  • Free-Wheeling Clutch Lever: The outside lever rotates freely when locked, preventing excessive force from being transferred to the lever and reducing the chance of breakage or damage.
  • Retrofit-Ready: Can retrofit Schlage L9000 Series mortise locks without drilling additional holes for sectional and escutcheon trims, with no exposed mounting screws on outside or inside trims.
  • Armor Faceplate: Brass or stainless steel faceplate measuring 8" x 1 7/32" (203mm x 31.3mm) per ANSI Standard A115.1, with curve lip strike and dust box.

Certifications & Compliance

  • ANSI/BHMA A156.13 Series 1000, Operational & Security Grade 1
  • UL and cUL Listed for A label (3-hour fire door), stamped letter F and UL symbol on armor faceplate
  • Meets positive pressure requirements per UL 10C and UBC 7-2 (1997)
  • Meets ADA requirements, designed for Barrier Free Application

Technical Specifications

  • Product Group: Mechanical Locks
  • Cylinder and Keyways: 6-pin solid brass "C" keyway standard, Interchangeable Core locks will accept compatible 6 or 7 Pin cores with BEST, FALCON and ARROW (SFIC)
  • Product Subgroup: Mortise Locks and Trim
  • Product Type: Mortise Locks
  • Subcategory: Mortise Lockset
  • Latch Throw: 3/4" (latch), 1" (deadbolt)
  • Keyed Function: Double Cylinder
  • Commercial/Residential: Commercial
  • Keyed: Yes
  • Lock Function: Classroom Security
  • Product Attribute: Mortise Locks
  • Electronic: No
  • Product Model: SC8458
  • (CTC) Center-to-Center: 3-7/8"
  • Product Function: Classroom Security
  • Door Hand Direction: Field Reversible
  • Door Thickness Range: 1-3/4"
  • Face Plate: Brass or stainless steel, 8" x 1-7 /32"
  • Product Category: Mechanical Locks
  • Backset (Distance): 2-3/4"
  • Department: Door Hardware

Typical Applications

  • Educational Facilities
  • Commercial Office Buildings
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Retail Establishments
  • Multi-Tenant Residential Properties

Why Cal-Royal SC8458?

Cal-Royal mortise lockset products deliver professional-grade reliability with heavy-duty wrought steel and stainless steel construction rated for over 1,000,000 test cycles under ANSI A156.13 Grade 1 standards. Engineered for demanding classroom and commercial applications where dependable, code-compliant performance is essential.

Product Specs

Product Group:
Mechanical Locks
Cylinder and Keyways:
6-pin solid brass "C" keyway standard, Interchangeable Core locks will accept compatible 6 or 7 Pin cores with BEST, FALCON and ARROW (SFIC)
Grade:
Grade 1
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Locks
Subcategory:
Mortise Lockset
ANSI/BHMA:
ANSI Standard A115.1
Latch Throw:
3/4" (latch), 1" (deadbolt)
Keyed Function:
Double Cylinder
Commercial/Residential:
Commercial
Lock Type:
Mortise
Keyed:
Yes
Handle Type:
Lever
Lock Function:
Classroom Security
Product Attribute:
Mortise Locks
Electronic:
No
Product Model:
SC8458
(CTC) Center-to-Center:
3-7/8"
Product Function:
Classroom Security
Door Hand Direction:
Field Reversible
Door Thickness Range:
1-3/4"
Face Plate:
Brass or stainless steel, 8" x 1-7 /32"
Product Category:
Mechanical Locks
Product Substrate:
Steel
Backset (Distance):
2-3/4"
Department:
Door Hardware

Cal-Royal SC8458 SS US26D – Frequently Asked Questions

1) Will the Cal-Royal SC8458 mortise lock replace a Schlage L9000 mortise lock without redrilling the door?
Yes. The SC8458 retrofits Schlage L9000 Series mortise locks with no additional holes drilled, for both sectional and escutcheon trims. It runs the same 2-3/4 inch backset and 3-7/8 inch center-to-center spacing, and there are no exposed mounting screws on either the inside or outside trim, so the swap looks factory on an existing prep.
2) Do I have to specify handing when ordering the Cal-Royal SC8458?
No. The lock body is field reversible, so one part number covers left and right hand openings and you reverse it on site. For a school or a property manager stocking spares, that means a single SKU on the shelf instead of two.
3) How does classroom security function work on the Cal-Royal SC8458, and can a teacher lock the door from inside?
It is a double cylinder classroom security lock, meaning there is a keyed cylinder on both sides. A teacher can lock the outside lever by key from inside the room without stepping into the corridor. The outside lever uses a free wheeling clutch, so when it is locked the lever spins instead of resisting, which keeps someone yanking on it from snapping the spindle or trim.
4) Can I use the Cal-Royal SC8458 on a 3-hour fire rated door?
Yes. It is UL and cUL Listed for A label 3-hour fire doors, with the letter F and the UL symbol stamped on the armor faceplate so an inspector can verify it in place. It also meets positive pressure per UL 10C and UBC 7-2 (1997). One caveat for fire openings: the SC8458 carries a deadbolt, and deadbolt use on a fire door has to suit the opening's egress requirements.
5) Will the SC8458 latch and bolt into my existing ANSI mortise strike?
The latch bolt throws 3/4 inch and the hardened stainless deadbolt throws a full 1 inch. Faceplate is 8 x 1-7/32 inches per ANSI A115.1, and a curved lip strike with dust box ships with the lock. Because the 1 inch deadbolt needs real depth, an old strike without a proper dust box pocket will bind it, so use the supplied strike and box on any frame that was not prepped for a 1 inch bolt.
6) Does the Cal-Royal SC8458 take small format interchangeable cores from BEST, Falcon or Arrow?
Interchangeable core versions accept compatible 6 or 7 pin SFIC cores from BEST, FALCON and ARROW, so a facility already keyed on a BEST SFIC system can pin these into the existing masterkey plan. The standard build ships with a 6-pin solid brass "C" keyway cylinder instead. Pick the one that matches your key system before you order.
7) How does the Corbin Russwin ML2003 compare to the Cal-Royal SC8458 for a classroom door?
Both are Grade 1 mortise locks for 1-3/4 inch doors with a classroom function. The Corbin Russwin ML2003 is a keyed classroom lockset in the ML2000 Series. The Cal-Royal SC8458 is a classroom security configuration: it is double cylinder, so the door can be locked from either side, and it carries a 1 inch throw deadbolt and a separate auxiliary latch in addition to the 3/4 inch latch bolt. If the specification calls for lockdown from inside the room, the SC8458 covers it; if the requirement is standard keyed classroom function without a deadbolt, the ML2003 is the simpler fit.
8) If I need an electronic classroom mortise lock instead of the Cal-Royal SC8458, what are the options?
The Cal-Royal SC8458 is a mechanical lockset with no electronic operation. For credential-based classroom openings, the TownSteel FME-2000 Series is a Grade 1 heavy duty classroom mortise lockset with RFID technology for 1-3/4 inch doors, and the TownSteel FME-4000 Series is an electronic intruder classroom mortise lockset with RFID, also Grade 1 heavy duty at 1-3/4 inch. For keypad entry, the Alarm Lock DL3500CR is a Grade 1 Trilogy electronic mortise lock with classroom function and 300 user codes, fitting doors 1-5/8 to 1-7/8 inch. All three fit the same nominal door as the SC8458 but require programming rather than keys on the 6-pin brass C keyway.
9) Is the Sargent 4874 mortise deadbolt a substitute for the Cal-Royal SC8458?
No. The Sargent 4874 is a double cylinder mortise deadbolt on a 2-3/4 inch backset in the 4870 Series - it is deadbolt only, with no latch and no lever. The Cal-Royal SC8458 shares the 2-3/4 inch backset and the double cylinder keying, but it is a complete lever lockset combining a 1 inch deadbolt, a 3/4 inch latch bolt and an auxiliary latch. If the opening already has a separate latch or exit device and only needs added bolt security, the 4874 addresses that; if the door needs both latching and deadbolting from one mortise pocket, the SC8458 does it in one case.
10) I need a Grade 1 mortise lock on a 3-hour fire door in a school. Which options hold that rating?
The Cal-Royal SC8458 is UL and cUL listed for A label 3-hour fire doors, with the letter F and UL symbol stamped on the armor faceplate, and it meets positive pressure requirements per UL 10C and UBC 7-2 (1997). Among fire rated peers, the Schlage Electronics LEMD-GRW is a Grade 1 ENGAGE Series wireless mortise lock with a 3 hour fire rating and a 125kHz proximity reader, and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock that carries a fire rating and is field reversible. The SC8458 and the MA101 are both field reversible, so handing does not need to be specified.
11) What trim and finish choices do I need to pick when ordering the Cal-Royal SC8458?
Two decisions. First the lever trim design, in sectional or wide escutcheon: AE, AS, GE, GS, HE, HS, JE, JS, SE, SS, TE, TS, WE and WS. Second the finish, from US3 polished brass, US4 satin brass, US10B antique bronze oiled, US26D satin chrome and US32D satin stainless steel. US26D is the usual match for school and office corridors already running satin chrome lever hardware.
12) Is the Cal-Royal SC8458 tough enough for a high traffic school corridor?
It is ANSI/BHMA A156.13 Series 1000 Grade 1, operational and security, and tested past 1,000,000 cycles. The case is wrought steel with zinc dichromate plating, the deadbolt hardened stainless, and the latch a one-piece stainless anti-friction tongue that stands up to doors being pulled shut against a closer all day.
13) Does the SC8458 meet ADA lever requirements for a barrier free opening?
Yes. It is a lever handle lockset and meets ADA requirements for barrier free application, so it works on accessible routes where knobs are not permitted.
14) Should I buy a mechanical classroom security mortise lock or an electronic one?
The SC8458 is fully mechanical, no wiring, no batteries, no software. Lockdown is done by key at the door and the lock keeps working when the power drops. If you want audit trail, credentials or remote lockdown instead, TownSteel's FME-2000 Series is a Grade 1 classroom mortise lockset with RFID for 1-3/4 inch doors, and the FME-4000 Series adds electronic intruder classroom function. Those need a battery and credential program behind them; the Cal-Royal does not.
15) What are the alternatives to the Cal-Royal SC8458 if I need a classroom mortise lock without a deadbolt?
The SC8458 is a deadbolt lock, with a 1 inch deadbolt plus an auxiliary latch on top of the main latch bolt. For plain classroom function on a 1-3/4 inch door with no deadbolt, Corbin Russwin's ML2003 is a Grade 1 mortise classroom lockset in the ML2000 Series. If you want the classroom security indicator approach, the Marks USA LA318GJ is a Grade 1 classroom security indicator mortise lockset, also for 1-3/4 inch doors, supplied with an ANSI strike.
16) What should I use instead of the Cal-Royal SC8458 if the door does not need a deadbolt?
The SC8458 is built around a 1 inch throw deadbolt with double cylinder keying, so it is more lock than a corridor or storeroom opening needs. For a storeroom opening, the Accentra 8805FL is a Grade 1 storeroom mortise lock in the 8800 Series with an Arcadia lever. The BEST 45H Series is a heavy duty public entrance mortise lock body with field reversible operation, matching the SC8458 in being reversible without specifying handing. For a non-keyed opening, the Hager 3850E is an office function mortise lock with lever and escutcheon on a 2-3/4 inch backset, the same backset the SC8458 uses.
17) For a dormitory or corridor door, how does the Sargent 7925 differ from the Cal-Royal SC8458?
The Sargent 7925 is a Grade 1 heavy duty corridor/dormitory exit function mortise lock in the 7900 Series with rose trim and a single cylinder deadbolt. The Cal-Royal SC8458 is Grade 1 with a classroom security function and a double cylinder arrangement, meaning the 1 inch deadbolt is key operated from both sides rather than from one. Trim differs as well: the 7925 comes with rose trim, while the SC8458 is ordered with a sectional or wide escutcheon trim code.
18) We are standardizing classroom hardware and already run BEST SFIC cores. Which mortise locks work with that?
The Cal-Royal SC8458 in interchangeable core form accepts compatible 6 or 7 pin cores from BEST, FALCON and ARROW SFIC, with a 6-pin solid brass C keyway as the standard non-IC option. Within the same mortise family, the BEST 45HCA Series heavy duty mortise lockbody with intruder function is another option if you want an intruder-style lockdown, and the BEST 45H Series is a heavy duty public entrance lockbody for openings that do not need classroom lockdown. Keying all three on your existing SFIC cores keeps one key system across the facility.
19) Will a Baldwin 6310 mortise lock body fit where the Cal-Royal SC8458 goes?
Not without changing the door prep. The Baldwin 6310 entrance/storeroom mortise lock body is built on a 2-1/2 inch backset for doors 1-3/8 inch and over. The Cal-Royal SC8458 uses a 2-3/4 inch backset with 3-7/8 inch center-to-center spacing on a 1-3/4 inch door, so the cylinder and spindle holes land in different places. If you are matching an existing Schlage L9000 prep, the SC8458 retrofits that series for sectional and escutcheon trims without drilling additional holes.
20) For a behavioral health or ligature-resistant classroom, what mortise lockset should I look at instead of the Cal-Royal SC8458?
The Cal-Royal SC8458 is a lever lockset, which is not what anti-ligature specifications call for. The TownSteel MRX-L-01 is a Grade 1 heavy duty anti-ligature lever mortise lockset in stainless steel with a passage function for 1-3/4 inch doors, and the MRX-A-01 is a Grade 1 heavy duty passage mortise lockset with satin stainless ligature resistant arch trim, also 1-3/4 inch. For a push/pull opening, the Marks USA 5PDN is a Grade 1 hospital passage mortise paddleset that is ligature resistant and ADA compliant in satin stainless steel. All three are passage function, so they do not replace the keyed classroom security that the SC8458 provides.
21) What does the auxiliary latch on the Cal-Royal SC8458 actually do?
It is a stainless steel non-handed auxiliary latch that deadlocks the main latch bolt when the door closes, so the latch cannot be shimmed or carded back. Because it is non-handed, it does not add anything to specify on the order.
22) What is the difference between the Cal-Royal SC8458 and a Schlage PM010 passage mortise lock?
They solve different problems. The Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors - it latches the door but never locks it. The Cal-Royal SC8458 is keyed, double cylinder, and adds a 1 inch throw deadbolt and an auxiliary latch on the same 1-3/4 inch door. Use the PM010 where the opening must stay free-operating in both directions, and the SC8458 where the room needs to be secured.
23) Is the Schlage L0170 a working alternative to the Cal-Royal SC8458?
No. The Schlage L0170 is a Grade 1 heavy duty non-keyed half dummy trim in the L Series for 1-3/4 inch doors - it is trim only, with a dummy function and no latching or locking mechanism. The Cal-Royal SC8458 is a keyed, double cylinder working lockset with a 1 inch deadbolt and 3/4 inch latch. The L0170 is typically ordered alongside working hardware to dress an inactive leaf, not in place of it.
How fast can I get the Cal-Royal SC8458 SS US26D delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Cal-Royal SC8458 SS US26D come with a warranty?
Absolutely. The Cal-Royal SC8458 SS US26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Cal-Royal SC8458 SS US26D?
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