Medeco 54515L Indoor/Outdoor 6...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$73.00
$54.53
Medeco Medeco Indoor/Outdoor 6 Pin Padlock, 5/16" Shackle Diameter Less Cylinder MED-54515L

Medeco 54515L Indoor/Outdoor 6-Pin High Security Padlock, 5/16" Shackle Diameter, Less Cylinder

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Model: 54515K0
$73.00
$54.53

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

$73.00
$54.53
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Medeco 54515L Indoor/Outdoor 6-Pin High Security Padlock — 5/16" Shackle Diameter, Less Cylinder

The Medeco System Series 54515L is a high-security indoor/outdoor padlock engineered for demanding commercial applications where key control and physical attack resistance are paramount. Featuring a 5/16" diameter boron alloy steel shackle, this weather-resistant padlock delivers exceptional protection against cutting and pulling attacks while maintaining superior ductility to resist brittleness. The 6-pin cylinder configuration and hardened stainless steel inserts provide the ultimate defense against drilling and other forms of physical attack. This model is supplied less cylinder, allowing integration with Medeco 4 (M4) High Security cylinders or Intelligent Key electronic cylinder technologies.

Key Features

  • 5/16" Boron Alloy Steel Shackle: Provides exceptional resistance to cutting and pulling attacks while maintaining an outstanding degree of ductility — not brittle under stress.
  • Hardened Stainless Steel Cylinder Inserts: Internal stainless steel inserts deliver the ultimate defense against drilling, pulling, and other forms of vandal or physical attack.
  • 6-Pin High Security Cylinder Configuration: The 6-pin design combined with Medeco's unique elevating and rotating tumbler pin system creates a virtually pick-proof locking mechanism.
  • Weather-Resistant Indoor/Outdoor Design: Purpose-built body style engineered to withstand outdoor environmental exposure, suitable for a wide range of indoor and outdoor applications.
  • Medeco 4 (M4) Key Control Technology: Patented M4 keys may only be duplicated by Medeco or an authorized Medeco service outlet, and only at the owner's request — preventing unauthorized key duplication including protection against 3D printing via the Shuttle Pin movable element.
  • Flexible Keying Options: Padlocks can be ordered keyed alike, keyed differently, or master keyed to integrate with existing door hardware systems for comprehensive key management.
  • Less Cylinder Configuration: Supplied without cylinder, enabling selection from a variety of Medeco cylinder technologies including Medeco 4 High Security and Intelligent Key electronic cylinders.
  • Durable Machined Brass Cylinder Components: All Medeco cylinders are constructed of machined brass, designed to last the life of the equipment.
  • Extended Shackle Availability: Extended shackle lengths are available for Indoor/Outdoor padlock models; shackle diameters available in 5/16" or 7/16".

Certifications & Compliance

  • Commercial-Grade Security Hardware
  • Patented Medeco 4 (M4) Key Control — Unauthorized Duplication Prevention
  • Utility Patent Protection on M4 Design Against Unauthorized Key Duplication

Technical Specifications

  • Series: Medeco System Series Padlock
  • Cylinder Technology: Medeco 4 (M4)
  • Pinning: 6-Pin
  • Shackle Diameter: 5/16"
  • Shackle Material: Boron alloy steel (cutting and pulling resistant)
  • Body Style: Indoor/Outdoor Weather-Resistant
  • Certification: UL 437 Listed
  • Construction: Durable machined brass cylinder components; hardened stainless-steel cylinder inserts
  • Warranty: 2-year manufacturer's warranty

Typical Applications

  • Commercial Office Buildings and Campus Facilities
  • Industrial and Warehouse Facilities
  • Utility and Infrastructure Access Points
  • Educational Institutions and Government Buildings
  • Healthcare Facilities and Secure Storage Areas
  • Outdoor Equipment and Asset Protection
  • High-Security Environments Requiring Key Control Programs

Why Medeco?

Medeco System Series padlocks are engineered with boron alloy steel shackles, hardened stainless steel cylinder inserts, and patented M4 key control technology to deliver professional-grade security in the most demanding commercial environments. The virtually pick-proof elevating and rotating tumbler pin system, combined with machined brass cylinder construction, ensures long-term reliability and resistance to the full spectrum of physical and covert attacks. For facilities where key control and attack resistance are non-negotiable, the Medeco System Series sets the standard.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:
Other / Miscellaneous Hardware
Product Subgroup:
Padlocks
Product Type:
Padlocks
Subcategory:
Padlocks
Commercial/Residential:
Commercial
Series:
System Series
Shackle Width:
7/8"
Cylinder and Keyways:
6Pin
Product Lockbody Color:
Black
Product Category:
Other / Miscellaneous Hardware
Product Substrate:
Stainless Steel
Department:
Door Hardware

Medeco 54515K0 – Frequently Asked Questions

1) Does the Medeco 54515L padlock come with a cylinder, or do I have to order one separately?
The 54515L ships less cylinder. You order the cylinder separately and choose the technology: a Medeco 4 (M4) High Security cylinder or an Intelligent Key electronic cylinder. That is the point of the configuration, since it lets the padlock join a key system you already run rather than forcing a standalone key. Budget for the cylinder as a separate line on the order, and specify the keyway and keying at the same time.
2) Can Medeco 54515L padlocks be keyed alike or master keyed into the building's existing Medeco system?
Keyed alike, keyed different, or master keyed are all orderable on the System Series padlock, and because it takes the same M4 cylinder used in Medeco door hardware it can sit on the same master key system as the doors. For a facility standardizing keys across openings and padlocks, that is the reason to buy this instead of a standalone padlock. Specify the keying scheme when you place the order along with the cylinder.
3) What is the difference between key retaining and non-key retaining on the Medeco 54515L, and which should I order?
Both are offered. Key retaining means the key cannot be removed while the shackle is open, so the padlock cannot be left hanging unlocked and the key walked away with. That is what you want on gates, utility cabinets, and anywhere a crew opens and re-secures the same point. Non-key retaining lets the key come out with the lock open, which suits an employee who carries one key across many locks and does not want it captive. Pick one, since it is a fixed option on the padlock, not a field change.
4) Is the Medeco 54515L padlock UL 437 listed, and does the 6-pin cylinder actually resist picking and drilling?
UL 437 Listed, which is the attack-resistance listing for key-in-lock security, is stated for this padlock. The cylinder is 6-pin and uses Medeco's elevating and rotating tumbler pins, so a pick has to lift each pin to height and rotate it correctly. Hardened stainless steel inserts in the cylinder are what defeat drilling and pulling attacks. For a spec that names high security key control and attack resistance, this is what satisfies it.
5) Can my tenants or staff get Medeco M4 padlock keys copied at a hardware store?
No, and that is the reason to buy it. M4 keys are patented and may only be duplicated by Medeco or an authorized Medeco service outlet, and only at the owner's request. The Shuttle Pin movable element also blocks 3D printed copies. If you are running a key control program across a campus, a hospital, or a multi-family portfolio, this is the mechanism that keeps the key count honest.
6) What is the closest equivalent to the Medeco 54515L padlock if I need the same 5/16 inch shackle diameter?
The Schlage KS23D/KS23F is a brass padlock with a 5/16 inch diameter shackle, matching the 5/16 inch shackle diameter of the Medeco 54515L Indoor/Outdoor 6-pin padlock. The difference is in how each is supplied and keyed: the Medeco 54515L ships less cylinder so a Medeco 4 (M4) high security or Intelligent Key electronic cylinder is selected separately, and it uses a boron alloy steel or stainless steel shackle depending on the option chosen. The Schlage KS23D/KS23F is a brass padlock in the Schlage 20 Series. A locksmith standardizing on one keyway across an account should pick based on which cylinder platform the rest of the facility already runs.
7) I need a padlock that takes an interchangeable core instead of a fixed cylinder. What should I use?
The Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, so the core drops in and out without replacing the padlock body. The Medeco 54515L is also supplied less cylinder, but it is built around Medeco 4 (M4) high security and Intelligent Key electronic cylinder technologies rather than a removable core format. For an institutional facility rekeying on a schedule with its own core stock, the removable core Sargent 60-858-2 fits that workflow; for an account running a Medeco key control program, the 54515L keeps the padlocks on the same patented M4 keyway as the door hardware.
8) We are already on a Sargent KESO key system. Does the Medeco 54515L fit that program?
No. The Sargent 82-856 is the KESO Series padlock, non-key retaining with a 2 inch by 2 inch brass case and a stainless steel shackle, and it keys into a Sargent KESO system. The Medeco 54515L is supplied less cylinder and takes Medeco 4 (M4) high security or Intelligent Key electronic cylinders, so it joins a Medeco key control program instead. A facility standardizing padlocks onto its existing door hardware keyway should match the platform first and then pick the body style; the 54515L can be ordered keyed alike, keyed different, or master keyed within the Medeco system.
9) Boron alloy steel or stainless steel shackle on a Medeco padlock, which one for an outdoor gate?
Boron alloy steel is the cut and pull resistant choice, and it holds ductility rather than going brittle under stress, so it is the one for exposed gates, yards, and anything a bolt cutter could reach. Stainless steel is the corrosion play, for coastal, wash-down, or chemical exposure where rust is the failure you actually see. Both are offered on the 54515L in either shackle length. If the threat is attack, take boron; if the threat is the weather, take stainless.
10) Will the Medeco 54515L padlock hold up mounted outside year round?
The 54515L uses the Indoor/Outdoor body style, built for outdoor environmental exposure, with a black lock body and stainless steel substrate. Pair it with the stainless shackle option in salt air or wash-down areas. It is a commercial-duty padlock, not a residential shed lock, so it is sized for utility access points, yard gates, and industrial equipment that sits in the weather.
11) Is there another brass padlock with a 5/16 inch shackle if I do not need Medeco key control?
The Schlage KS23D/KS23F is a brass padlock with the same 5/16 inch shackle diameter, so it fits the same hasp opening as the Medeco 54515L. The difference is the cylinder program: the Medeco comes less cylinder for M4 high security or Intelligent Key, with duplication restricted to authorized outlets. If the padlock is on a low-risk interior cabinet, the Schlage covers it; if the key needs to be uncopyable, it does not substitute.
12) What is a cheaper alternative to the Medeco 54515L high security padlock for lockout tagout or general use?
If you do not need patented key control, the ABUS 72/30 anodized aluminum safety padlock has a 1-1/4 inch body and a 3/16 inch shackle, and the ABUS 74/40 insulated safety padlock runs a 6-pin cylinder with a 1/4 inch shackle and a 1-1/2 inch body. Both are lighter-duty safety padlocks with thinner shackles, so they are for identification and procedure enforcement rather than resisting a cutting attack. The Medeco is the one to keep where the padlock is the actual security barrier.
13) What other padlock takes a small format interchangeable core so I can rekey it in-house?
The Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, which is the one to look at if your locksmith wants to swap cores on site rather than order cylinders. The Medeco 54515L also ships less cylinder, but it is built around Medeco 4 or Intelligent Key cylinders, so it stays inside the Medeco key system. Choose on which key system the rest of the building runs.
14) Is an ABUS 72/30 or 74/40 safety padlock a substitute for a Medeco high security padlock?
They serve different jobs. The ABUS 72/30 is an anodized aluminum safety padlock with a 1-1/4 inch body width and a 3/16 inch shackle diameter, and the ABUS 74/40 is an insulated safety padlock with a 6-pin cylinder, 1/4 inch shackle diameter and 1-1/2 inch body width. Safety padlocks like these are the lockout/tagout style used to isolate energy sources, where the lock identifies a worker rather than resisting attack. The Medeco 54515L is a commercial 6-pin high security padlock with a 5/16 inch shackle in boron alloy steel or stainless steel, hardened stainless steel cylinder inserts, and patented M4 key control. If the requirement is attack and drill resistance on a gate, yard, or utility enclosure, the 54515L is the one specified; if it is LOTO, the ABUS safety padlocks are.
15) What padlock should I use on a marine or coastal exterior application instead of the Medeco 54515L?
The ABUS T84MB/30 Nautic is a black sleeve padlock with a 13/64 inch shackle diameter and a 1-17/64 inch body width, built for the wet, salt-exposed applications its Nautic name describes, and it is sold in a 3-pack. The Medeco 54515L is a weather-resistant indoor/outdoor body style with a 5/16 inch shackle in boron alloy steel or stainless steel and hardened stainless steel cylinder inserts. The 54515L carries the heavier shackle and the M4 key control program; the ABUS T84MB/30 is the lighter sleeve-protected lock for gates, lockers, and equipment where the exposure matters more than the attack rating.
16) Which other brands offer key retaining versus non-key retaining padlocks like the Medeco 54515L?
Sargent splits the same way: the 758 is the key retaining standard padlock in US4 satin brass, and the 858 is non-key retaining with a stainless steel shackle. The Sargent 82-856 is a non-key retaining KESO padlock with a 2 by 2 inch brass case and stainless shackle. The Medeco 54515L offers both retaining options in one model, so you can standardize the padlock across a site and vary only the retention behaviour by opening.
17) What is the difference between the Medeco 54515L and the ABUS 76/40 aluminum core padlock?
The ABUS 76/40 is a plastic-covered aluminum core padlock with a 1/4 inch shackle diameter and a 1-37/64 inch body width, so the plastic jacket protects the finish of whatever the lock swings against. The Medeco 54515L is a black-bodied commercial 6-pin high security padlock with a 5/16 inch shackle in boron alloy steel or stainless steel and hardened stainless steel cylinder inserts against drilling. The ABUS 76/40 has a smaller shackle and an aluminum core; the 54515L is the heavier body with the patented M4 key control, and it ships less cylinder so the cylinder is chosen separately.
How fast can I get the Medeco 54515K0 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 Medeco 54515K0 come with a warranty?
Absolutely. The Medeco 54515K0 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 Medeco 54515K0?
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
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