Medeco 5451500 Indoor/Outdoor ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$232.00
$168.25
Medeco 5451500 Indoor/Outdoor 6-Pin High Security Padlock with M4 Cylinder and 5/16" Boron Alloy Shackle

Medeco 5451500 Indoor/Outdoor 6-Pin High Security Padlock with M4 Cylinder and 5/16" Boron Alloy Shackle

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Model: 5451500-00P
$232.00
$168.25

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

$232.00
$168.25
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Medeco 5451500 Indoor/Outdoor 6-Pin High Security Padlock with M4 Cylinder and 5/16" Boron Alloy Shackle

The Medeco System Series 5451500 is a high-security indoor/outdoor padlock engineered with M3 and M4 cylinder technologies, a 6-pin rotating tumbler pin configuration, and a boron alloy steel shackle measuring 5/16" in diameter. Built with a machined brass body and hardened stainless steel inserts, this padlock delivers exceptional resistance to cutting, drilling, picking, and unauthorized key duplication. Available in 5/16" or 7/16" shackle diameters, the System Series is designed for demanding commercial and industrial environments where maximum physical security and strict key control are non-negotiable.

Key Features

  • M4 High-Security Cylinder: Medeco M4 cylinder with utility patent and 3D key duplication protection ensures only authorized Medeco service outlets can reproduce keys.
  • 6-Pin Rotating Tumbler System: Six-pin configuration with rotating tumbler pins provides virtually pick-proof performance against sophisticated bypass attempts.
  • Boron Alloy Steel Shackle: 5/16" diameter boron alloy shackle delivers superior tensile strength and ductility, resisting cutting, pulling, and twisting attacks.
  • Hardened Stainless Steel Inserts: Internal stainless steel inserts within the machined brass cylinder body defend against drilling and physical tampering.
  • Shrouded Shackle Option: Optional shrouded shackle configuration available for increased protection against bolt cutter and pry attacks.
  • Strict Key Control: Patented keys can only be duplicated by authorized Medeco service outlets at the owner's request, preventing unauthorized key copying.
  • Flexible Keying Options: Available keyed alike, keyed different, or master keyed to accommodate complex security hierarchies and large-scale deployments.
  • Medeco Intelligent Key Compatible: Available with Medeco Intelligent Key electronic cylinder technology and other advanced cylinder options for integrated access control.
  • Shackle Diameter Options: Choose from 5/16" or 7/16" shackle diameters, with extended shackle configurations offered for indoor/outdoor models.

Certifications & Compliance

  • M3 and M4 Cylinder Technology with Utility Patent Protection
  • 3D Key Duplication Protection — Authorized Medeco Service Outlets Only
  • Weather-Resistant Finish for Indoor and Outdoor Use

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

  • Outdoor Gates and Perimeter Fencing
  • Utility Enclosures and Industrial Equipment
  • Cargo Containers, Trailer Doors, and Storage Units
  • Retail Back-of-House and Stockroom Areas
  • High-Security Lockers and Commercial Buildings
  • Government and Municipal Facilities
  • Educational and Healthcare Institution Asset Protection

Why Medeco?

Medeco System Series padlocks are engineered with the same cylinder strength found in high-security deadbolts, combining a machined brass body, hardened stainless steel inserts, and boron alloy steel shackles to resist the most sophisticated physical attacks. The M4 cylinder's patented 3D key control technology and 6-pin rotating tumbler system make this padlock a professional-grade solution for any application where cut resistance, drill protection, and unauthorized key duplication prevention are critical requirements.

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
Tags:
medeco padlock, strongest combination padlock
Product Lockbody Color:
Black
Product Category:
Other / Miscellaneous Hardware
Product Substrate:
Stainless Steel
Department:
Door Hardware

Medeco 5451500-00P – Frequently Asked Questions

1) Can the Medeco 5451500 padlock be keyed into my existing Medeco master key system?
Yes, if your system runs on one of the keyways this padlock is built for. The 5451500 is offered in Biaxial G3, Bilevel DL, Keymark 8E, M3 DL, and Original 00 keyways, and it can be ordered keyed alike, keyed different, or master keyed. Tell us the keyway and the system your building runs and it drops into the existing hierarchy. If you would rather pin it yourself, order it Sub-Assembled instead of Pinned and your locksmith finishes it on your bitting.
2) Is the Medeco 5451500 padlock OK outdoors on a perimeter gate year round?
It is built for it. The 5451500 is an indoor/outdoor weather resistant body, machined brass with hardened stainless steel inserts, in black. The shackle is where the choice matters outside: boron alloy steel gives you the cut and pull resistance, stainless steel gives you corrosion resistance for coastal, washdown, or heavy salt exposure. Both are offered on the 5451500, so match the shackle to the environment rather than defaulting.
3) Can a copy of the Medeco 5451500 key be made at a hardware store?
No, and that is the point of buying it. The M4 cylinder carries utility patent protection and 3D key duplication protection, which means keys can only be reproduced by authorized Medeco service outlets at the owner's request. A hardware store cannot cut a blank for it. For a property manager or facility running a lot of contractors through a site, that is the difference between rekeying after every turnover and knowing the key count is what your records say it is.
4) Is the Medeco 5451500 padlock UL listed for high security?
The 5451500 is UL 437 Listed. UL 437 is the standard for key locks tested against picking, drilling, and forced physical attack, which is the listing an institutional or government spec typically calls for when it says high security padlock. The 6-pin rotating tumbler cylinder and hardened stainless inserts in the brass body are what carry it.
5) Can I put Medeco 5451500 padlocks on the same key as the deadbolts in my building?
That is the usual reason to buy them. The System Series padlock runs the same cylinder technology as Medeco's high security deadbolts, and it is offered in the Biaxial G3, Bilevel DL, Keymark 8E, M3 DL, and Original 00 keyways. If your doors are already on one of those, the padlocks go into the same master key system and one key opens the gate, the utility enclosure, and the door. Give us the keyway your doors run when you order.
6) What is the closest brass-body padlock to the Medeco 5451500 with the same 5/16 inch shackle diameter?
The Schlage KS23D/KS23F is the closest match on shackle stock: it is a brass padlock with a 5/16 inch diameter shackle, the same shackle diameter the Medeco 5451500 System Series padlock uses. The difference is in the cylinder and the shackle metal. The 5451500 is a 6-pin high security padlock built around Medeco M3 and M4 cylinder technology with patented 3D key control, UL 437 listed, and it is ordered with either a boron alloy steel or stainless steel shackle. The Schlage KS23D/KS23F is a 20 Series brass padlock. Choose the Medeco where restricted key duplication and drill and pick resistance drive the specification, and the Schlage where a conventional brass padlock body on the same 5/16 inch shackle is what the opening calls for.
7) I need a key retaining padlock so the key cannot be pulled while the lock is open - what are my options besides the Medeco 5451500?
The Medeco 5451500 System Series padlock is ordered as either key retaining or non-key retaining, so the retaining behavior is a selection on the padlock itself. If a different brand is required for the same behavior, the Sargent 758 is a key retaining standard padlock supplied in US4 satin brass finish. Its counterpart, the Sargent 858, is the non-key retaining version with a stainless steel shackle in the same US4 satin brass. Specify key retaining where the padlock must stay captive with its key until it is relocked, such as gates and enclosures that must not be left hanging open.
8) What is a good high security padlock alternative if the facility standardizes on interchangeable cores instead of a fixed cylinder?
The Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, so the core can be pulled and rekeyed in place by the facility locksmith without replacing the padlock body. The Medeco 5451500 System Series padlock takes a different approach to key control: it is a 6-pin padlock built on Medeco M3 and M4 cylinder technology with patented 3D key duplication protection, keyed alike, keyed different, or master keyed to order, and it accepts Biaxial G3, Bilevel DL, Keymark 8E, M3 DL, or Original 00 keyways. Pick the Sargent 60-858-2 when the padlock has to join an existing removable core program, and the Medeco 5451500 when the padlock has to join an existing Medeco patented keyway system.
9) Is an ABUS 72/30 safety padlock a substitute for the Medeco 5451500 on a perimeter gate?
No. 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. Both are built around a light aluminum body and a thin shackle. The Medeco 5451500 is a 5/16 inch shackle padlock with a machined brass body, hardened stainless steel inserts, and a boron alloy steel shackle for cut, pull, and twist resistance, UL 437 listed for indoor and outdoor use. The ABUS safety padlocks and the Medeco 5451500 answer different jobs: personnel lockout on equipment versus physical attack resistance on an outdoor gate.
10) We already run a Sargent KESO padlock program - can we add the Medeco 5451500 to it?
They are separate key systems. The Sargent 82-856 is a KESO Series non-key retaining padlock with a 2 inch by 2 inch brass case and stainless steel shackle, keyed within the KESO system. The Medeco 5451500 is a 6-pin padlock keyed on Medeco cylinder technology, available in Biaxial G3, Bilevel DL, Keymark 8E, M3 DL, or Original 00, with duplication restricted to authorized Medeco service outlets. A padlock added to an existing program has to share that program's keyway, so extend a KESO site with the Sargent 82-856 and extend a Medeco site with the 5451500 in the keyway already in service.
11) Key retaining or non-key retaining Medeco padlock, which do I want?
Key retaining means the key will not come out while the shackle is open, so the padlock cannot be walked away from an open gate with the key still in someone's pocket. That is what you want on shared assets, tenant gates, and anything a crew opens and closes all shift. Non-key retaining lets the key come out with the lock open, which suits a single holder who carries one key across many locks and does not want to be tied to an open padlock. The 5451500 is built both ways, so pick it on the order.
12) What is the difference between the Medeco 5451500 and a Sargent or Schlage brass padlock?
Different jobs. The Medeco 5451500 is the high security end: UL 437 Listed, 6-pin rotating tumbler, boron alloy shackle, patented key control. The Schlage KS23D/KS23F brass padlock carries the same 5/16 inch shackle diameter, so it swaps into the same hasps physically, without the patented key control. The Sargent 758 is a key retaining brass padlock with a stainless shackle and the 858 the non-key retaining version of the same, and the Sargent 60-858-2 runs a removable core with a 2 inch stainless shackle, which is the one to look at if your site is standardized on interchangeable cores.
13) Is a Medeco high security padlock the right lock for electrical lockout tagout?
No. The 5451500 is a security padlock, built to stop cutting, drilling, picking, and unauthorized key copying on gates, containers, and enclosures. Lockout tagout wants a non-conductive or insulated safety padlock instead. From what ZenSupply carries, the ABUS 74/40 insulated safety padlock with a 6-pin cylinder and 1/4 inch shackle, the ABUS 76/40 plastic-covered aluminum core padlock, or the anodized aluminum ABUS 72/30 with a 3/16 inch shackle are the safety-series locks for that use.
14) Which padlock resists corrosion better in a coastal or wash-down location, the Medeco 5451500 or an ABUS sleeved lock?
The Medeco 5451500 System Series padlock is an indoor/outdoor weather resistant body with a machined brass cylinder, hardened stainless steel inserts, and a choice of boron alloy steel or stainless steel shackle, so specifying the stainless shackle is the corrosion-minded configuration. 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, and the ABUS 76/40 is a plastic-covered aluminum core padlock with a 1/4 inch shackle and 1-37/64 inch width. The ABUS locks put a protective sleeve or cover over a small body and thin shackle; the Medeco puts the weather resistance into a brass body carrying a 5/16 inch shackle. Match the choice to whether the exposure or the attack risk is the governing concern.
15) Is the Medeco 5451500 padlock a commercial grade lock or a residential one?
Commercial. The 5451500 is a System Series padlock built for commercial and industrial duty, machined brass body with hardened stainless steel inserts and a boron alloy shackle, UL 437 Listed. It is the lock spec'd for perimeter fencing, utility enclosures, cargo containers, stockrooms, and government and institutional asset protection, not for a garden shed.
How fast can I get the Medeco 5451500-00P 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 5451500-00P come with a warranty?
Absolutely. The Medeco 5451500-00P 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 5451500-00P?
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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