Arrow MK33-BD-CS Grade 2 Asylu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$308.88
$187.73
Arrow MK33-BD-CS Grade 2 Asylum Cylindrical Lock, Ball Knob, Conventional Cylinder Schlage C Keyway

Arrow MK33-BD-CS Grade 2 Asylum Cylindrical Lock, Ball Knob, Conventional Cylinder Schlage C Keyway

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Model: MK33-BD-26D-CS
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$308.88
$187.73
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Arrow MK33-BD-CS Grade 2 Asylum Cylindrical Lock, Ball Knob, Conventional Cylinder Schlage C Keyway

MK Series Grade 2 Cylindrical Knob Locks

The Arrow MK Series has a clear design and is a simple solution to accessibility requirements.

The MK Series is available in several finishes and functions that make them ideal for commercial applications where heavy duty grade one hardware may not be necessary.

  • Lock Chassis – Cold rolled steel with zinc dichromate finish for corrosion resistance. Requires standard 2-1/8" (53.97mm) bore through door.
  • Backset – 2-3/8" (60.32mm) standard. 2-3/4" (69.85mm), 3-3/4" (95.25mm) and 5" (127mm) available.
  • Door Thickness – 1-3/8" (34.92mm) to 1-3/4" (44.45mm). Latch – Brass with 1/2" (12.7mm) throw.
  • Latch housing is steel, with zinc dichromate finish for corrosion resistance. 7/8" (22.225mm) bore in edge of door is required.
  • Latch Front – Brass, bronze or stainless steel. Standard faceplate for 2-3/8” (60.32.mm) backset measures 2-1/4” (57.15mm) x 1” (25.40mm) with a flat front, for 2-3/4” (69.85mm) backset standard faceplate measures 2-1/4” (57.15mm) x 1-1/8” (28.57mm) with beveled front 1/8” (3.17mm) in 2” (50.8mm). 
  • Strike – Brass, bronze or stainless steel. Standard “T” strike measures 2-3/4" (69.85mm) x 1-1/8" (28.57mm). Optional ANSI A115.1 strike measures 4-7/8" (123.82mm) x 1-1/4" (31.75mm). All strikes have a 1-1/4" (31.75mm) lip to center dimension.
  • Handing– Reversible.
  • Cylinder, Standard – Solid brass 6 pin cylinder with Arrow “A” keyway, keyed to 5 pin for stock. Can be masterkeyed, grandmaster keyed and construction master keyed. Conventional cylinders are also available in a variety of competitive manufacturer’s keyways. Supplied with two 5 pin brass keys for stock. Available in Schlage CS keyway and other competitive keyways.

  • Handing: Non-handed

  • Bolt Projection: 1/2"

  • Cylinder Type: Conventional Cylinder

  • Pins: 6

  • Number of Keys: 2

  • Keys: Cut

  • Standard Latch Type: Deadlatch

  • Screws: Wood/Machine Screws

  • Standard Latch Backset Dimension: 2-3/4"

  • Bore Hole Diameter: 2-1/8"

  • Lock Face Size: 2-1/4" × 1-1/8"

  • Function Family: Institutional

  • ANSI Function: F87 – Asylum

  • Latch Bore Diameter: 7/8"

  • Door Thickness: 1-3/8" to 1-3/4"

  • Standard Strike Height: 2-3/4"

  • Standard Strike Width: 1-1/8"

  • Lever/Knob Design Family: Ball Knob

  • Rose/Escutcheon Dimensions: 2-9/16"

  • Rose/Escutcheon Design: 2-9/16" Rose Diameter

  • Standard Keyway: Schlage C

  • Standard Latch Number: 114

  • Standard Strike Number: 300

  • Standard Strike Type: T-Strike

  • Lever/Knob Design: BD – Ball Knob

  • Function: 33 – Asylum

Dimensions & Packaging

  • Pack Quantity: 1

  • Pack Height: 2.63"

  • Pack Length: 7.5"

  • Pack Width: 3.5"

  • Pack Volume: 68.91 in³

  • Product Height: 2.63"

  • Product Length: 7.5"

  • Product Width: 3.5"

  • Shipping Weight: 1.5 lbs

Manufacturer Resources

Product Specs

Grade:
Grade 2
Duty Level:
Heavy Duty
Keyed Function:
Conventional Cylinder
Standard Strike:
ANSI 1-1/4" x 4-7/8" with 1-3/16" Lip
Rose Diameter:
3-1/2"
ANSI/BHMA:
F87
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Leversets
Subcategory:
Cylindrical Locks
Keyed:
Yes
Electronic:
No
Commercial/Residential:
Commercial
Cylinder and Keyways:
C Keyway
Lock Type:
Cylindrical
Handle Type:
Lever
Lock Function:
Asylum/Institution/Utility
Product Attribute:
Cylindrical Locks
Product Model:
MK33
Product Function:
Asylum/Institution/Utility
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Arrow MK33-BD-26D-CS – Frequently Asked Questions

1) What does the F87 asylum function on the Arrow MK33 actually do at the door?
Asylum function means the key controls the latch from both sides. The MK33 is the ANSI F87 asylum/institution/utility function, so there is no free egress by turning the knob unless the key retracts the latch. That is why it shows up on utility closets, mechanical rooms, and behavioral health openings where you do not want anyone operating the door without a key. Because it locks both sides, it is not appropriate on an egress door where code requires free exit.
2) Will the Arrow MK33 fit my existing 2-1/8 inch bore door prep?
Yes on a standard commercial cylindrical prep. The MK33 chassis needs a 2-1/8 inch bore through the door face and a 7/8 inch bore in the door edge for the latch, which is the standard cylindrical prep. Door thickness range is 1-3/8 to 1-3/4 inches, and it ships with a 2-3/4 inch backset as the catalogued standard. If your existing holes are 2-1/8 through-bore at either 2-3/8 or 2-3/4 backset, you are dropping into prep that already exists.
3) Can I key the Arrow MK33-BD-CS into my existing Schlage C master key system?
That is exactly what the CS suffix is for. The MK33-BD-CS comes with a conventional cylinder cut to the Schlage C keyway rather than Arrow's standard A keyway, so it drops into an existing Schlage C system. Arrow conventional cylinders can be masterkeyed, grandmaster keyed, and construction master keyed. It is a 6-pin cylinder supplied with two keys.
4) Will the Arrow MK33 latch into the strike that's already in my frame?
Depends which strike you have. The MK33 is catalogued with the ANSI strike, 1-1/4 by 4-7/8 inches with a 1-3/16 inch lip, which is the deep-cut frame prep on most commercial hollow metal. Arrow also offers the standard T strike at 2-3/4 by 1-1/8 inches for frames prepped the smaller way. Latch throw is 1/2 inch and it is a deadlatch, so the strike lip has to line up properly for the deadlatching plunger to ride on the strike face rather than dropping into the pocket.
5) I need ADA lever trim, not a knob. Is the MK33-BD the right one?
No. The BD in MK33-BD is the ball knob design, not a lever. Round knobs are generally not acceptable where accessible operable hardware is required. If you need a lever with the same asylum function, look at a lever-trim version of the MK Series or the Dexter C1000 Series asylum F87, which is a lever lock with the F87 function.
6) What is the closest equivalent to the Arrow MK33-BD-CS if I need an asylum function lock in Grade 1?
The Arrow MK33-BD-CS is a Grade 2 cylindrical lock with the F87 asylum function. The Dexter C1000 Series asylum lock (DEX-C1000-ASYL) carries the same F87 asylum function in a Grade 1 cylindrical chassis, and it covers a door thickness range of 1-3/8 inch to 2 inch versus the Arrow's 1-3/8 inch to 1-3/4 inch. Choose the Dexter where the specification calls for Grade 1 on an institutional opening or where the door is thicker than 1-3/4 inch; the Arrow is the match when Grade 2 satisfies the spec and you want a ball knob rather than a lever.
7) Is a storeroom lock a substitute for the Arrow MK33-BD-CS on a utility room door?
They are not interchangeable in function. The Arrow MK33-BD-CS is F87 asylum, keyed on both sides with no free-turning inside knob. A storeroom lock such as the Cal-Royal AG05, a Grade 2 storeroom lockset with a deadlocking latchbolt, or the Hager 2580 Grade 2 storeroom lock with Withnell lever, keeps the outside locked at all times while the inside always retracts the latch. If the requirement is controlled egress on a utility or institutional opening, the Arrow asylum function is the one to order; if the room only needs to stay secure from the corridor with free exit, the storeroom locks are the simpler answer.
8) Which alternatives to the Arrow MK33-BD-CS also use a Schlage C keyway so they key alike?
The Arrow MK33-BD-CS ships with a conventional cylinder in the Schlage C keyway. Among cylindrical locks that key into the same system, the Cal-Royal AG00 entrance lever uses a 6-pin Schlage C keyway keyed different with a 2-3/8 inch backset, and the Cal-Royal AG03 classroom lever uses a 6-pin Schlage C keyway with a 2-3/4 inch backset. Note the AG00's 2-3/8 inch backset against the Arrow's 2-3/4 inch standard when matching existing door prep.
9) Does this Arrow lock have to be handed when I order it?
No handing to specify. The MK33 is non-handed and the latch is reversible, so one part number covers left and right hand openings. For a property manager buying spares across a building, that means a single stocked item covers every door in the fleet regardless of swing.
10) Is a Grade 2 lock enough for a commercial building, or should I be buying Grade 1?
Grade 2 is the middle ANSI/BHMA tier and the Arrow MK Series is built for commercial openings where Grade 1 is more than the traffic calls for, such as utility rooms, storage, and back-of-house doors. For high-traffic or abuse-prone openings, Grade 1 asylum equivalents exist, for example the Dexter C1000 Series asylum F87, which carries the same F87 function at Grade 1 and covers 1-3/8 to 2 inch doors. Same function, heavier chassis.
11) What backsets can I get the Arrow MK Series in for a wide-stile or unusual door?
Beyond the 2-3/4 inch standard, the MK Series latch is offered at 2-3/8, 3-3/4, and 5 inch backsets. The 3-3/4 and 5 inch options are what you order when the door has a wide stile or the knob would otherwise foul the frame or an adjacent surface. The faceplate differs by backset too: the 2-3/8 inch latch uses a flat 2-1/4 by 1 inch front, the 2-3/4 inch latch a beveled 2-1/4 by 1-1/8 inch front.
12) What ships in the box with the Arrow MK33-BD-CS?
One complete lockset: chassis with ball knob trim both sides, the 114 latch (deadlatch, 1/2 inch throw), the 300 T-strike, two cut 5-pin keys, and wood and machine screws. Pack quantity is one. If your frame is prepped for the ANSI 4-7/8 inch strike rather than the T-strike, order that strike separately.
13) What's a Grade 2 alternative if I need a keyed Schlage C cylindrical lock but not the asylum function?
Cal-Royal's AG Series covers the common functions in Grade 2 with a 6-pin Schlage C keyway: the AG00 entrance lever on a 2-3/8 inch backset, the AG03 classroom lever on a 2-3/4 inch backset, and the AG05 storeroom lever with a deadlocking latchbolt. All keyed alike potential on the same C keyway as the Arrow MK33-BD-CS, so they can sit in one system across a building.
14) Our facility standardizes on lever handles for ADA - what takes the place of the Arrow MK33-BD-CS ball knob?
The Arrow MK33-BD-CS uses the BD ball knob design. If your standard calls for a lever, the Dexter C1000 asylum lock is the same F87 asylum function in a cylindrical lever, and the Dexter C1000 classroom security lock is a Grade 1 lever option that keys both sides of the door for outside and inside latch control. Both are Grade 1 chassis, so verify your specification does not require the Grade 2 line before switching.
15) Can I use a Falcon B511 or Hager 2525 in place of the Arrow MK33-BD-CS?
Not for the same opening. The Arrow MK33-BD-CS is the asylum function, keyed outside and inside. The Falcon B511CP6D is a Grade 2 medium duty cylindrical lever with entry/office function, and the Hager 2525 is a Grade 2 commercial entry lock - both are single-cylinder entry locks where the inside handle is always free. They share the Grade 2 rating with the Arrow but not its dual-keyed control. Use them on offices and tenant entries, and keep the MK33 for openings that require the key on both sides.
16) What pairs with the Arrow MK33-BD-CS on doors in the same run that do not need to be locked?
For non-keyed openings alongside an Arrow MK33-BD-CS run, the Falcon B101 is a Grade 2 medium duty cylindrical passage lock with a non-handed design, matching the Arrow's non-handed mounting, and the Hager 2510 is a Grade 2 passage lock that covers doors from 1-3/8 inch to 2 inch thick. For a closet or inactive leaf that only needs trim, the BEST 7KC Series single dummy is a Grade 2 non-keyed dummy trim.
17) Is a Grade 3 lever like the Kwikset Breton or Cal-Royal AUS00 acceptable in place of the Arrow MK33-BD-CS?
They sit at a different duty level. The Arrow MK33-BD-CS is a Grade 2 commercial lock rated heavy duty. The Cal-Royal AUS00 is a Grade 3 entrance/office lever with a solid brass forged body covering 1-3/8 inch to 1-3/4 inch doors, and the Kwikset 200BRNL Breton is a Grade 3 passage lever for the same thickness range. On commercial and institutional openings where a Grade 2 commercial lock is specified, the Arrow is the correct choice; the Grade 3 levers suit lighter residential-duty interior doors.
18) How much of the door face does the Arrow MK33 rose cover on a retrofit?
Rose diameter is listed at 3-1/2 inches on the spec, with the MK Series rose design described at 2-9/16 inches. If you are swapping out an older lock, measure the wear ring or paint shadow on the door before ordering, since a smaller rose will not cover the footprint the old lock left behind.
19) Is the Arrow MK33 chassis going to hold up in a damp or corrosive area like a mechanical or pool equipment room?
The chassis is cold rolled steel with a zinc dichromate finish for corrosion resistance, and the latch housing gets the same treatment. The latch itself is brass and the latch front and strike are offered in brass, bronze, or stainless steel. Finish on the trim is 626 satin chrome. It is a mechanical lock with no electronics, so there is nothing to fail if the room loses power.
How fast can I get the Arrow MK33-BD-26D-CS 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 Arrow MK33-BD-26D-CS come with a warranty?
Absolutely. The Arrow MK33-BD-26D-CS 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 Arrow MK33-BD-26D-CS?
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 Arrow MK33-BD-26D-CS from ZenSupply?
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