Product Description
MK11-BD-03-CS Arrow MK Series Grade 2 Cylindrical Knob Lock — Entrance/Office, Schlage C Keyway, Bright Brass
You are adding a lock to a building that is already keyed to Schlage C, and you do not want one more oddball key on the ring. Order the standard Arrow MK11 and you get Arrow's own keyway — a cylinder that will not accept the blank you already stock, on a door the customer expects to open with the same key as the rest of the floor. That is a return, or a service call to swap the cylinder before the lock has been used once. This SKU is Arrow's factory answer: the same Grade 2 MK11 entrance knob, built with a conventional cylinder cut to the Schlage C keyway, so it drops into an existing Schlage C system instead of fighting it.
What this configuration is
MK11 is the entrance/office function — ANSI/BHMA F109. The outside knob is locked and unlocked by the turn/push-button in the inside knob; turning the inside knob or the key releases it. The latch retracts from the inside knob at all times, so it never blocks egress. This is the workhorse function for offices, storage rooms, and back-of-house doors in commercial buildings where a Grade 1 mortise lock is more hardware than the opening needs.
The BD knob is Arrow's ball knob, in 605 bright brass. The lock is non-handed — it fits a left- or right-hand door with no field conversion. The only thing that separates this part number from the standard MK11-BD-03 is the cylinder keyway: this one is Schlage C, the standard part is not.
SKU Breakdown
| Segment | Code | What It Means |
|---|---|---|
| Series | MK | Arrow MK Series — Grade 2 commercial cylindrical knob lock |
| Function | 11 | Entrance/Office — turn/push-button locking (ANSI F109) |
| Knob Design | BD | B = Ball knob (B Wrought); D = D Wrought rose |
| Finish | 03 | Bright Brass (605 / US3) |
| Keyway | CS | Conventional cylinder cut to the Schlage C keyway |
Technical Specifications
| Specification | Value |
|---|---|
| SKU | MK11-BD-03-CS |
| Manufacturer | Arrow (ASSA ABLOY) |
| Series | MK Series Grade 2 Cylindrical Knob Locks |
| Product Type | Cylindrical knob lock |
| Function | Turn-Pushbutton Entrance/Office |
| ANSI Function Code | F109 |
| Grade | ANSI/BHMA Grade 2 |
| Knob Design | BD — Ball Knob (B Wrought) on D Wrought rose |
| Knob Projection | 3-1/8" (79.37 mm) |
| Rose Diameter | 2-9/16" (65.08 mm) |
| Knob Diameter | 2-1/4" (57.15 mm) |
| Cylinder | Conventional cylinder, Schlage C keyway |
| Handing | Non-handed |
| Finish | 605 / US3 Bright Brass (Polished Brass) |
| Base Material | Brass |
| Fire Rating | 3 Hours (A label) |
| Application | Commercial |
| Backset | Not specified in this part number — see FAQ below |
| Strike / Latch | As supplied by Arrow with the complete lockset |
| Country of Origin | Mexico |
| Warranty | 1 year manufacturer warranty |
| Unit of Measure | Each |
Compliance & Codes
UL Listed. BHMA A156.2, Series 4000, Grade 2. ANSI function F109. Fire rated 3 hours (A label). The inside knob always retracts the latch, which satisfies the free-egress requirement in NFPA 101 for this type of opening.
What's in the Box
Complete MK11 lockset: outside knob with the keyed Schlage C cylinder, inside knob with turn/push-button, latch, strike, mounting screws, and keys as supplied by Arrow. This is a complete keyed lockset, not a less-cylinder chassis. Arrow prices keyed-alike and keyed-different the same on this line, so specify which you want on a multi-lock order — neither costs extra.
Pro-Installer FAQ
Q: How is this different from the standard MK11-BD-03?
A: Only the keyway. Mechanically it is the same Grade 2 MK11 entrance knob in the same 605 bright brass. The -CS suffix means the conventional cylinder is cut to the Schlage C keyway so it works inside an existing Schlage C system. If you do not need Schlage C, order the standard MK11-BD-03.
Q: How many pins is the cylinder, and which blank does it take?
A: Arrow does not publish a pin count or a keyblank designation for this cylinder, and we will not guess at one. If you are keying this into an existing Schlage C system, tell us which blank you already cut for that system before you order and we will confirm it against the factory before anything ships.
Q: What backset does it come with, 2-3/8" or 2-3/4"?
A: Arrow builds the MK latch both ways — their 111 latch is 2-3/8" and their 114 latch is 2-3/4" — but this part number does not carry a latch code, and our supplier lists it as a single SKU with no backset option. We will not guess at it. Tell us your door's backset when you order and we will confirm what ships against the factory before it leaves. It is a conventional cylinder, so it rekeys in the field like any standard pin-tumbler.
Lock Depot sells brand new Arrow products with the full manufacturer warranty.
Product images are representative and may not depict the exact SKU, finish, or configuration listed. Always verify specifications before ordering.
