Arrow 550RK-44 Tailpiece Repla...
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Arrow 550RK-44 Tailpiece Replacement Part for RK Series Cylinders

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Model: 550RK-44

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

$17.15
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Arrow 550RK-44 Tailpiece Replacement Part for RK Series Cylinders

The Arrow 550RK-44 is a commercial-grade tailpiece replacement part engineered specifically for Arrow's RK Series cylinder locks. As a precision-manufactured component within Arrow's Parts and Accessories lineup, this tailpiece is designed to restore proper function to RK Series cylinders in commercial door hardware applications. Sourced directly from Arrow, this replacement part ensures OEM-level fit and compatibility with the existing RK Series lock system.

Key Features

  • OEM Compatibility: Designed specifically for Arrow RK Series cylinders, ensuring proper fit and reliable mechanical function without modification.
  • Commercial-Grade Construction: Built to Arrow's commercial hardware standards, providing dependable performance in demanding door hardware applications.
  • Direct Replacement Part: A genuine Arrow replacement component that restores cylinder operation to original manufacturer specifications.
  • Precision Fit: Manufactured to exact tolerances required for seamless integration with existing RK Series cylinder assemblies.
  • Genuine Arrow Part: Sourced as an authentic Arrow accessory, maintaining the integrity and performance of the original lock system.

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: 550RK-44
  • Features: Arrow Parts

Typical Applications

  • Commercial Office Buildings with Arrow RK Series Cylinder Locks
  • Educational Facilities Requiring Cylinder Component Replacement
  • Healthcare Institutions Servicing Existing Arrow Lock Hardware
  • Retail Establishments Maintaining Commercial Door Hardware
  • Industrial and Warehouse Facilities with Arrow Mechanical Lock Systems
  • Government and Municipal Buildings Using Arrow RK Series Hardware
  • Multi-Tenant Residential Properties with Commercial-Grade Lock Systems

Why Arrow 550RK-44?

Arrow has a long-standing reputation for manufacturing reliable commercial door hardware components built to exacting standards. The 550RK-44 tailpiece reflects Arrow's commitment to providing genuine OEM replacement parts that preserve the performance and security integrity of the original RK Series cylinder installation. For facilities managers and locksmiths maintaining Arrow hardware, this part delivers a dependable, specification-correct solution.

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:
550RK-44
Features:
Arrow Parts

Arrow 550RK-44 – Frequently Asked Questions

1) What exactly is the Arrow 550RK-44 and what does it do?
The 550RK-44 is the tailpiece, not a complete cylinder. It's the flat driving bar that transfers key rotation from an Arrow RK Series cylinder into the lock mechanism. If your key turns but the lock doesn't retract, a worn, bent, or sheared tailpiece is the usual culprit, and this is the Arrow replacement piece for it. Ordering this does not get you a keyed cylinder body or keys.
2) Will the 550RK-44 tailpiece fit an Arrow cylinder other than the RK Series?
It is made for Arrow RK Series cylinders only. Tailpiece length, width and the mounting cut are specific to a cylinder family, so fitting one from a different series is a guess you don't want to make on a door you have to secure. Confirm the cylinder body is RK Series before ordering this part.
3) If the Arrow RK cylinder itself is worn out rather than just the tailpiece, what complete cylinder can go in instead?
The Arrow 550RK-44 is a tailpiece only, a replacement part for RK Series cylinders, so it does nothing for a worn plug or damaged pin stack. When the cylinder body needs to be replaced, a complete unit is the right buy: the Kaba Ilco 1539 Series is a key-in-knob and lever universal cylinder, and the Kaba Ilco 1599 is a key-in-knob replacement cylinder. For a rim device, the Schlage 20-021 is a 6-pin rim cylinder with a vertical tailpiece cam and the Schlage 20-022 is the same cylinder with a horizontal tailpiece cam. Confirm the keyway and the tailpiece orientation your existing device needs before ordering.
4) I need a high-security upgrade on an Arrow lock instead of an OEM repair part. What retrofits?
The Arrow 550RK-44 tailpiece restores an existing RK Series cylinder to original Arrow specification and does not change the key control. For an upgrade path on Arrow hardware, the Medeco 1065140 is a 5-pin retrofit cylinder listed for the Arrow JL interconnected lock as well as Emtek handleset and deadbolt outside cylinders. On the interchangeable core side, the BEST 1CDF is a drill resistant preferred patented interchangeable core 7-pin brass cylinder in the 150 Series. These change the keying system, so plan the key schedule for the whole facility before swapping a single door.
5) My opening is a mortise lock, not an RK cylinder. What should I be looking at?
The Arrow 550RK-44 tailpiece is specific to Arrow RK Series cylinders and has no application in a mortise lock body, which uses a cam rather than a tailpiece. For mortise work, the Corbin Russwin 1000 Grade 1 Series mortise cylinder is 1-1/2 inches with an A02 straight cam, the Corbin Russwin 1070 Grade 1 Series is a 1-1/4 inch 6-pin mortise housing with an A01 cloverleaf cam, and the Corbin Russwin 1080 Grade 1 Series is a 1-1/2 inch LFIC 6-pin mortise cylinder for Schlage L9000 mortise locks. The Adams Rite 4036 mortise cylinder is a Grade 1 five-pin unit for doors from 1/2 inch minimum thickness. Match the cam to the lock body.
6) I manage several buildings on Arrow hardware. Is replacing just the tailpiece enough, or should I replace the whole cylinder?
If the key still turns smoothly and the keying is intact, swapping the tailpiece restores operation without rekeying anything, which keeps your existing key system untouched. Replace the full cylinder instead when the plug is worn, the pins are sticking, or the keyway itself is damaged. For fleet standardization on non-Arrow keyways, a full-size interchangeable core route such as the BEST 1CB 150 Series core or the Schlage 20-057 FSIC rim cylinder is the swap-the-core approach, but those change the key system rather than repair the one you have.
7) I need a replacement cylinder for an Arrow interconnected lock, not a tailpiece. What should I look at?
The 550RK-44 is only the tailpiece, so it won't help if the cylinder itself is the problem. For an Arrow JL interconnected lock, the Medeco 1065140 is a 5-pin retrofit cylinder listed for that application. If you need a rim cylinder instead, the Corbin Russwin 3070 6-pin rim housing ships with a 1-7/8 inch tailpiece, and the Schlage 20-021 and 20-022 are 6-pin rim cylinders with vertical and horizontal tailpiece cams respectively.
8) Does the 550RK-44 come with keys or require rekeying after installation?
No keys are involved. A tailpiece carries no pins and no keyway, so fitting it changes nothing about your keying, master keying or existing key bitting. That's the advantage of repairing at the tailpiece instead of replacing the cylinder.
9) Is any modification or drilling needed to install the 550RK-44?
None. It is a direct replacement into an existing RK Series cylinder assembly, so it goes in without modification and returns the cylinder to original manufacturer specification. Typical job is pulling the cylinder, removing the old tailpiece and retainer, fitting this one, and reinstalling.
10) Will a Kaba Ilco universal cylinder replace an Arrow RK cylinder and let me skip the tailpiece question?
The Kaba Ilco 1539 Series is a key-in-knob and lever universal cylinder, meaning it is built to serve multiple lock brands rather than one, and universal cylinders of that type normally ship with a tailpiece selection. The Arrow 550RK-44 takes the opposite approach: it is a genuine Arrow replacement part matched to RK Series cylinders so the original cylinder stays in service. Ilco also lists the 1579 knob and lever cylinder specifically for Sargent and the 1549 key-in-deadbolt cylinder, so verify which lock family you are actually retrofitting before you substitute.
11) Is a rim cylinder with a tailpiece the same thing as the Arrow 550RK-44 tailpiece?
No. The Arrow 550RK-44 is the tailpiece alone, a replacement component for RK Series cylinders. A part such as the Corbin Russwin 3070 is a 6-pin rim cylinder housing supplied with a 1-7/8 inch tailpiece, and the Schlage 20-057 is a 6-pin FSIC rim cylinder with a convertible tailpiece cam. Those are complete cylinder assemblies that include a tailpiece, not loose tailpieces, so ordering one of them when you only need the driver leaves you with a cylinder you have to key.
12) We are standardizing a portfolio on interchangeable core. Does an OEM tailpiece repair still make sense?
The Arrow 550RK-44 is a commercial-grade OEM tailpiece that keeps an existing RK Series cylinder in service, which suits buildings staying on their current key system. A facility moving to interchangeable core is buying cores instead: the BEST 1C5 is a standard 5-pin cylinder core, the BEST 1CB is a Peaks 150 Series interchangeable core cylinder, and the Schlage 20-057-C is a full size interchangeable core in the C keyway with a 643E aged bronze finish. The practical split is whether you are repairing doors one at a time or re-keying the building under one core platform.
13) The opening is an aluminum storefront door. Is the Arrow 550RK-44 any use there?
The Arrow 550RK-44 applies only where an Arrow RK Series cylinder is already installed; it is a component, not a storefront trim solution. Narrow stile aluminum work is usually served by Adams Rite: the 4024 cylinder pull with trim plate mounting and the 4025 five pin tumbler cylinder pull with through-screws are both for the MS1847 deadlock and deadlatch, while the 4026 five pin tumbler cylinder pull is for the 5017 wood door deadlock and deadlatch. Identify the existing lock case first, since the pull has to match it.
14) Is there an equivalent key-in-lever cylinder from another brand if I cannot stay with Arrow RK?
The Arrow 550RK-44 is tied to the Arrow RK Series and is not cross-brand. If the door is being moved off Arrow entirely, the Falcon A23161-05 G is a key-in-lever cylinder for the RU/T Series with a 6-pin G keyway, keyed different, supplied with two cut keys, and the Detex MC65 is a 1-1/8 inch 6-pin commercial grade mortise cylinder in the Schlage C keyway. Both put the door on a different keyway than your Arrow system, so factor in master keying before you mix them into an existing building.
15) Is this an aftermarket tailpiece or a genuine Arrow part?
Genuine Arrow, sourced as an Arrow accessory and built to the tolerances the RK Series cylinder assembly needs. That matters on a tailpiece more than on most parts, since a few thousandths of slop in the drive slot shows up as a key that turns partway and stops.
16) Is the 550RK-44 rated for commercial door hardware or is it a residential part?
Commercial. Arrow builds the 550RK-44 to its commercial hardware standards, and it's used for cylinder service in office buildings, schools, healthcare, retail, warehouses, municipal buildings and multi-tenant residential running commercial-grade locks.
17) What about a lazy-motion tailpiece cylinder for a deadbolt or handleset, is that related?
Lazy-motion cylinders are a different mechanism from the Arrow 550RK-44 tailpiece, which is a fixed OEM driver for RK Series cylinders. The Medeco 1075127 is a 5-pin rim type lazy motion single cylinder for handlesets and deadbolts, the Medeco 1065244 is a 5-pin rim lazy motion cylinder supplied with an Emtek tailpiece, and the Medeco 1012040 is a 6-pin lazy motion rim cylinder for Kwikset single cylinder deadbolts. Choose those when the outside cylinder drives a residential-style deadbolt, not when you are repairing an Arrow RK cylinder in commercial door hardware.
18) I need a non-functioning cylinder for a pull side or an Emtek trim spare. Is a tailpiece what I want?
No. The Arrow 550RK-44 is a functional tailpiece that transmits key rotation in an RK Series cylinder. If the opening needs a filler that does not operate, the BEST 12E Series dummy rim cylinder measures 1-5/32 inches in diameter. For Emtek trim, the Emtek CY4 cylinder is sold individually as a parts item. Those serve appearance and trim-matching needs rather than restoring an Arrow lock to operation.
How fast can I get the Arrow 550RK-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 550RK-44 come with a warranty?
Absolutely. The Arrow 550RK-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 550RK-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 550RK-44 from ZenSupply?
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