Arrow 750-44 Tailpiece Replace...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$361.35
Image coming soon

Arrow 750-44 Tailpiece Replacement Part for MK Series B Knobs

(No reviews yet) Write a Review

Model: 750-44

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

$361.35
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Arrow 750-44 Tailpiece Replacement Part for MK Series B Knobs

The Arrow 750-44 Tailpiece is a genuine Arrow replacement component engineered specifically for MK Series B Knobs, excluding the Hotel Function configuration. Designed for commercial door hardware applications, this cylinder tailpiece ensures proper engagement between the cylinder and locking mechanism, maintaining the reliable performance Arrow is known for in mechanical lock systems. Purpose-built to restore or maintain full functionality of compatible MK Series B knob hardware in demanding commercial environments.

Key Features

  • OEM Compatibility: Designed exclusively for Arrow MK Series B Knobs (except Hotel Function), ensuring a precise, manufacturer-approved fit and reliable operation.
  • Genuine Arrow Component: An authentic Arrow replacement part engineered to maintain the performance and integrity of the original lock assembly.
  • Commercial-Grade Construction: Built to the standards of Arrow's commercial mechanical lock product line, suitable for high-use commercial applications.
  • Cylinder Tailpiece Function: Provides the critical connection between the cylinder and the locking mechanism, enabling proper lock actuation and key control.
  • Direct Replacement: Serves as a drop-in replacement component, minimizing downtime and simplifying service and maintenance of existing MK Series B knob hardware.
  • Part of the Arrow Parts Program: Sourced through Arrow's dedicated parts and accessories program for verified compatibility and quality assurance.

Technical Specifications

  • Department: Door Hardware
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Type: Cylinders
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: 750-44
  • Features: Arrow Parts

Typical Applications

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

Why Arrow 750-44?

Arrow's 750-44 Tailpiece reflects the brand's commitment to providing verified, application-specific replacement components for its commercial mechanical lock systems. As a genuine Arrow part designed for MK Series B Knobs, it delivers the precision fit and durability required to keep commercial door hardware performing at its best. Facility managers and service professionals can rely on this component to restore proper lock function quickly and confidently.

Manufacturer Resources

Arrow Express Catalog

Product Specs

Department:
Door Hardware
Product Category:
Mechanical Locks
Product Group:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Cylinders
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
750-44
Features:
Arrow Parts

Arrow 750-44 – Frequently Asked Questions

1) What locks does the Arrow 750-44 tailpiece fit?
The 750-44 tailpiece is made for Arrow MK Series B knobs, with one exception: it does not fit the Hotel Function version of that knob. If the knob you are servicing is an MK Series B in any other function, this is the matching Arrow part. Hotel function knobs use different cylinder engagement and need their own tailpiece.
2) If the cylinder itself is worn out on an Arrow MK Series B knob, not just the tailpiece, what should be ordered instead of the 750-44?
The Arrow 750-44 is only the tailpiece - the part that connects the cylinder to the locking mechanism so the key turn actuates the lock, supplied as a genuine replacement part for MK Series B knobs except the Hotel Function. If the plug and pins are the problem, a complete key-in-knob replacement cylinder is the right order instead. The Kaba Ilco 1599 is a key-in-knob replacement cylinder, and the Kaba Ilco 1539 is a key-in-knob/lever universal cylinder. Those supply the whole cylinder assembly; the 750-44 does not.
3) Our Arrow MK Series B is a Hotel Function knob - what do we order since the 750-44 is excluded?
The Arrow 750-44 tailpiece is specified for MK Series B knobs except the Hotel Function, so it should not be ordered for a hotel function knob. If the goal is simply to restore a working keyed knob rather than match the original hotel function, a complete key-in-knob replacement cylinder such as the Kaba Ilco 1599 or the universal key-in-knob/lever Kaba Ilco 1539 covers that application. Verify the cylinder body and keyway against the existing knob before ordering.
4) What does a tailpiece actually do in a knob lock, and why would I need to replace one?
The tailpiece is the flat bar that carries motion from the back of the key cylinder into the lock chassis. Turn the key, the cylinder plug turns, the tailpiece turns the retractor. If the tailpiece is bent, sheared, or worn at the tang, the key turns but nothing retracts, which is the usual reason a knob suddenly stops keying. The Arrow 750-44 restores that connection on MK Series B knob hardware without replacing the whole lockset.
5) Can I use a generic tailpiece from another brand instead of the Arrow 750-44?
No. A tailpiece is matched to a specific chassis, and the 750-44 is the Arrow OEM piece cut for MK Series B knobs. Substituting a tailpiece from another manufacturer's cylinder risks wrong length or wrong tang engagement, and the key will turn without pulling the latch. If you would rather replace the whole cylinder than the tailpiece, universal key-in-knob replacement cylinders such as the Kaba Ilco 1599 or the 1539 Series key-in-knob/lever cylinder are the route to look at instead.
6) I have several Arrow MK knob locks failing on key turn. Do I order tailpieces or new cylinders?
Check the failure first. If the key turns freely in the plug but the latch never moves, the tailpiece is the likely culprit and the 750-44 is the fix on MK Series B knobs (Hotel Function excepted). If the key will not enter or turn at all, or you are rekeying a building, the cylinder itself is the part to change. For fleet standardization across mixed hardware, interchangeable core options like the BEST 1C Series 5-pin core let you rekey without pulling locks apart.
7) Does the Arrow 750-44 come with a cylinder or keys?
No. The 750-44 is the tailpiece only, a service component for MK Series B knobs. If you need a cylinder with keys supplied, that is a separate purchase, for example the Falcon A23161-05 G key-in-lever cylinder which is listed as keyed different with two cut keys.
8) Can a Schlage 20-021 or 20-022 rim cylinder tailpiece cam be used in place of the Arrow 750-44?
No. The Schlage 20-021 and 20-022 are complete 6-pin rim cylinders - the 20-021 with a vertical tailpiece cam and the 20-022 with a horizontal tailpiece cam - so their tailpieces are part of a rim cylinder built for rim exit device prep. The Arrow 750-44 is a tailpiece made specifically for Arrow MK Series B knobs excluding the Hotel Function, engaging a knob cylinder rather than a rim housing. They are not interchangeable parts.
9) We want to upgrade our Arrow knob locks to a high security key instead of just replacing the tailpiece - what is available?
The Arrow 750-44 restores original function by replacing the tailpiece in an MK Series B knob; it does not change keying. For a high security cylinder in Arrow hardware, Medeco offers the 1065140, a 5-pin retrofit cylinder for the Arrow JL interconnected lock that also fits Emtek handleset and deadbolt outside cylinder applications. Confirm which Arrow lock series is on the door, since the 1065140 is specified for JL interconnected locks rather than MK Series B knobs.
10) If we are standardizing a building on interchangeable cores rather than servicing knob cylinders part by part, what is the alternative to ordering tailpieces like the Arrow 750-44?
The 750-44 is a service part that keeps an existing Arrow MK Series B knob working. A facility moving to interchangeable core keying works at the cylinder level instead: BEST offers the 1C Series standard 5-pin cylinder core and the Peaks 1CB 150 Series interchangeable core cylinder, and the 1CDF is a drill resistant patented interchangeable core 7-pin brass 150 Series cylinder. Schlage's 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam, and the 20-057-C is a full size interchangeable core in the C keyway. Those change the keying platform; the 750-44 keeps the original one.
11) Is the Arrow 750-44 the right part for a mortise lock, or do I need something else?
The 750-44 is a tailpiece for Arrow MK Series B knobs, a commercial mechanical lock part, not a mortise lock component. Mortise cylinders are ordered as complete housings with a cam: the Corbin Russwin 1000 Grade 1 mortise cylinder is 1-1/2 inch with an A02 straight cam, the 1070 is a 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam, and the Adams Rite 4036 is a Grade 1 five-pin mortise cylinder. For a mortise lock, one of those replaces the cylinder; the 750-44 does not apply.
12) We service Falcon and Sargent knob and lever locks too - what replaces the cylinder on those, since the Arrow 750-44 is Arrow-specific?
The 750-44 is engineered exclusively for Arrow MK Series B knobs, so it does not cross to other brands. For Falcon, the A23161-05 G is a key-in-lever cylinder for the RU/T series with a 6-pin G keyway, keyed different with two cut keys. For Sargent knob and lever locks, the Kaba Ilco 1579 is the corresponding cylinder. Each is brand-specific, so match the lock series before ordering.
13) Is the Arrow 750-44 suitable for high-traffic commercial doors, or is it a residential part?
It is a commercial part. The 750-44 comes out of Arrow's commercial mechanical lock line and is intended for service on MK Series B knobs in offices, schools, healthcare, retail, warehouses, multi-tenant residential and government buildings.
14) Is the Arrow 750-44 a genuine Arrow part or an aftermarket copy?
Genuine Arrow, supplied through Arrow's own parts and accessories program as a replacement component for MK Series B knob hardware.
How fast can I get the Arrow 750-44 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 750-44 come with a warranty?
Absolutely. The Arrow 750-44 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 750-44?
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 750-44 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.
!