Dorma C550 Grade 2Entry/Office...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$193.00
$97.67

Dorma C550 Grade 2Entry/Office Keyed Lever Lockset

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Model: C550-D-LRC-626
$193.00
$97.67
Selected Finish is
Selected Lever Type is
Selected Cylinder Type is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$193.00
$97.67
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DORMA C500 Series Lockset

Grade 2 Cylindrical Locksets

The C500 key-in-lever locksets are built with a high performance cylindrical chassis for all applications where ANSI/BHMA A156.2 Series 4000 Grade 2 products are required. These aesthetically versatile locks are available in two lever designs.

Locks ANSI/BHMA Grade 2 certified.

  • Ten different functions
  • Four standard finishes, two optional finishes
  • Simple installation
  • Optional patented key system available
  • Easily adjustable for doors from 1-3/8”- 1-13/16” thick

Product details

The C500 Series lockset can be recommended for applications like hotels, apartments, churches, municipal buildings, retails complexes, offices and warehouses.

 
 

Manufacturer Resources

Product Specs

Product Group:
Mechanical Locks
Series:
C500 Series
Grade:
Grade 2
Keyed Function:
Single Cylinder
ANSI/BHMA:
F82A
Product Subgroup:
Bored Locksets
Product Type:
Cylindrical Locks
Subcategory:
Cylindrical Locks
Keyed:
Yes
Commercial/Residential:
Commercial
Handle Type:
Lever
Standard Strike:
5001 - ANSI 1-1/4" x 4-7/8" square corner strike
Standard Latch:
15250 - 2-3/4" Backset 1" Faceplate Square Corner,
Product Attribute:
Cylindrical Locks
Product Model:
C550
Product Function:
Entrance/Office
Door Hand Direction:
Dependent on lever selection
Door Thickness Range:
1-3/8" to 1-3/4"
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"

Dormakaba C550-D-LRC-626 – Frequently Asked Questions

1) What applications is the DORMA C550 Grade 2 lever lockset designed for?
The C550 is designed for entry and office applications requiring Grade 2 security. It meets ANSI A156.2 Grade 2 standards for commercial and institutional use. Common installations include office buildings, schools, and light commercial facilities.
2) What door thickness does the C550 lockset accommodate?
Standard door thickness range is 1-3/8" to 1-3/4". Extended spindles may be available for thicker applications. Always verify your door thickness before ordering and check manufacturer specifications for exact compatibility.
3) How do I determine the correct handing for this lever lockset?
Stand on the side where the door opens toward you. If hinges are on the right, it's right-handed. If hinges are on the left, it's left-handed. Most DORMA lever locksets are reversible in the field without additional parts.
4) What finish options are available for the DORMA C550?
Common finishes include satin chrome, bright chrome, and satin stainless steel. Finish availability varies by function and may include architectural bronze options. Contact us to confirm specific finish availability for your required function.
5) What does Grade 2 certification mean for this lockset?
Grade 2 meets ANSI A156.2 standards for commercial use. It provides 400,000 cycle testing, 150 lbf lever torque resistance, and appropriate security levels for most commercial applications. It sits between Grade 1 (heavy-duty) and Grade 3 (light-duty) performance.
6) Does this lockset work with existing 5-pin SFIC cores?
The keyed version accepts standard 5-pin cylinders. Verify cylinder compatibility with your existing key system. SFIC compatibility depends on specific model configuration. Check with your locksmith or key system provider for proper cylinder selection.
7) What backset options are available for the C550?
Standard backsets are 2-3/8" and 2-3/4". Some models may offer adjustable backset capability. Verify your door preparation backset measurement before ordering. Non-standard backsets may require special ordering.
8) Can I install this lockset on a fire-rated door?
Fire rating depends on specific model certification and door assembly requirements. Check the lockset labeling and manufacturer documentation for fire rating compliance. Consult local fire marshal requirements for your specific application.
9) How do I adjust the lever return spring tension?
Spring adjustment varies by model design. Some units have accessible spring adjustment screws inside the lever mechanism. Consult the installation manual for specific adjustment procedures. Improper adjustment may affect lock performance.
10) What other DORMA lockset models are similar to the C550?
The C550 series includes various functions like passage, privacy, and classroom security. Related models may include C650 for heavier-duty applications. Browse our door hardware section for compatible DORMA products.
11) What door preparation is required for installation?
Standard preparation requires 2-1/8" door bore and appropriate backset. Edge bore is typically 1" diameter for latch installation. Always use manufacturer's template for precise measurements. Door frame preparation includes strike pocket and lip preparation.
How fast can I get the Dormakaba C550-D-LRC-626 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 Dormakaba C550-D-LRC-626 come with a warranty?
Absolutely. The Dormakaba C550-D-LRC-626 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 Dormakaba C550-D-LRC-626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Dormakaba C550-D-LRC-626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

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