Medeco 521 G8R Weather-Tight P...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$198.00
$130.00
Medeco Medeco G8R Weather-Tight Padlock Less Pop-Out Cylinder G8R-521

Medeco 521 G8R Weather-Tight Padlock Less Pop-Out Cylinder - Solid Stainless Steel Body

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Model: G8R-521-ST-51

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

$198.00
$130.00
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Medeco 521 G8R Weather-Tight Padlock Less Pop-Out Cylinder — Solid Stainless Steel Body

The Medeco G8R Weather-Tight Padlock is engineered for extreme environments where weather resistance and strong physical security are non-negotiable. Constructed from solid stainless steel, the G8R body resists both corrosion and physical attack, making it the padlock of choice for cargo containers, trailer doors, gates, and vending machines. The sealed construction protects cylinders from water and road grime, and each padlock includes a weather seal cap attached by a cable. The G8R accepts Medeco mechanical pop-out style (t-handle) cylinders for patented key control and pick resistance, as well as electronic Medeco Nexgen or XT cylinders for sophisticated audit and access control features.

Key Features

  • Solid Stainless Steel Body: The G8R body is constructed of solid stainless steel, providing exceptional resistance to corrosion and physical attack in extreme environments.
  • Weather-Tight Sealed Construction: Sealed design protects cylinders from water and road grime, ensuring reliable operation in harsh outdoor and transit conditions.
  • Flexible Shackle Options: Shackles can be specified in stainless steel for maximum corrosion resistance or hardened steel to withstand severe physical attack, fitting a wide range of security applications.
  • Weather Seal Cap Included: Each padlock includes a weather seal cap attached by a cable for added protection of the cylinder opening when not in use.
  • Mechanical Cylinder Compatibility: Accepts Medeco mechanical pop-out style (t-handle) cylinders, delivering the benefit of patented key control and pick resistance.
  • Electronic Cylinder Compatibility: Compatible with Medeco Nexgen or XT electronic cylinders, transforming the G8R into a portable access control system with sophisticated audit and control features for extreme environments.
  • Commercial-Grade Security: Designed for locking installations requiring weather resistance and strong physical security across commercial and industrial applications.

Technical Specifications

  • Series: Medeco G8R Padlock
  • Body Material: 300-series cast stainless steel
  • Shackle: Stainless steel or hardened steel (application-dependent)
  • Cylinder: Sold less cylinder; compatible with Medeco mechanical and NEXGEN electronic t-handle cylinders
  • Weatherproofing: Weather seal cap attached by steel cable; sealed construction resists water and road grime
  • Certification: UL 437 Listed (mechanical cylinder)
  • Warranty: 2-year manufacturer's warranty

Typical Applications

  • Cargo Containers and Intermodal Freight
  • Trailer Doors and Transport Security
  • Gates and Perimeter Access Points
  • Vending Machines and Outdoor Equipment
  • Industrial and Warehouse Facilities
  • Commercial Property Perimeter Security
  • Extreme Environment Access Control Deployments

Why Medeco?

Medeco G8R padlocks deliver professional-grade reliability through solid stainless steel construction and sealed weather-tight design engineered to perform in the most demanding environments. The G8R's versatility — accepting both mechanical cylinders with patented key control and pick resistance, and electronic Nexgen or XT cylinders for full access control capability — makes it a uniquely adaptable security solution. Engineered for commercial applications where dependable performance against weather, corrosion, and physical attack is essential.

Manufacturer Resources

Medeco Product Catalog

Product Specs

Product Group:
Other / Miscellaneous Hardware
Product Subgroup:
Padlocks
Product Type:
Padlocks
Subcategory:
Padlocks
Commercial/Residential:
Commercial
Series:
G8R
Product Model:
G8R
Product Lockbody Color:
26 - Satin Chrome
Product Category:
Other / Miscellaneous Hardware
Product Substrate:
Steel
Department:
Door Hardware

Medeco G8R-521-ST-51 – Frequently Asked Questions

1) Does the Medeco G8R 521 padlock come with a cylinder, or do I have to order one separately?
The G8R 521 ships less cylinder. You order the cylinder separately and it has to be a Medeco pop-out style (t-handle) cylinder, either mechanical for patented key control and pick resistance, or a Medeco Nexgen or XT electronic cylinder if you want audit trail and access control. Budget for that second line item before you place the order, because without a cylinder the padlock does not lock.
2) Should I get the stainless steel or the hardened steel shackle on a Medeco G8R padlock?
Pick by what is attacking the lock. Stainless steel shackle for maximum corrosion resistance, which is the call for coastal sites, marine exposure, and anything sitting in road salt year round. Hardened steel shackle to withstand severe physical attack, which is the call for cargo containers and gates where bolt cutters are the threat, not rust. Both are offered in 5/16 inch and 7/16 inch shackle diameters, so you choose material and diameter independently.
3) Will a Medeco G8R padlock survive outdoors on a gate or trailer without seizing up?
That is what the G8R is built for. The body is solid 300-series cast stainless steel, and the construction is sealed to keep water and road grime out of the cylinder. Each lock also comes with a weather seal cap on a steel cable that caps the cylinder opening when the lock is not being keyed. Typical deployments are cargo containers, trailer doors, gates, vending machines, and outdoor equipment.
4) Can I put the Medeco G8R padlock on an access control system with an audit trail?
Yes, by fitting a Medeco Nexgen or XT electronic cylinder instead of a mechanical one. That turns the G8R into a portable access control point with audit and control capability, which is how facilities track who opened a remote gate or a container and when. The mechanical route instead gives you patented key control and pick resistance without any electronics. Same padlock body either way, so you can standardize the hardware across a site and decide cylinder by cylinder which openings get electronics.
5) Is the Medeco G8R padlock UL listed?
With a mechanical cylinder fitted, the G8R is UL 437 Listed. UL 437 is the standard covering key locks for resistance to picking, drilling, and forcing, so it is the listing a specifier or insurer usually wants to see cited on a high security padlock. Note the listing is tied to the mechanical cylinder configuration.
6) Can I key a Medeco G8R padlock into the same system as the rest of my building?
Only if that system is Medeco. The G8R takes Medeco pop-out (t-handle) cylinders, so keying it alike or into a master system means your building is already on a Medeco patented keyway, which also means keys cannot be duplicated without authorization. If your site runs a Sargent system instead, a Sargent padlock keeps you on one key: the 758 is key retaining, the 858 is non-key retaining, and the 60-858-2 takes a removable core so it drops into an existing interchangeable core program. On a Schlage system, the KS23D/KS23F brass padlock with a 5/16 inch shackle is the counterpart.
7) What padlock has a stainless steel shackle like the Medeco 521 G8R but takes a removable core?
The Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, so it drops into an existing interchangeable core keying system rather than taking a cylinder. The Medeco 521 G8R is sold less cylinder and accepts Medeco mechanical pop-out (t-handle) cylinders or Medeco Nexgen and XT electronic cylinders, with the shackle specified in stainless steel or hardened steel at 5/16 inch or 7/16 inch diameter. If a facility is already standardized on removable cores, the 60-858-2 matches that system; if the requirement is a sealed weather-tight body for containers, trailers, and gates, the G8R is the one built for it.
8) Is an ABUS 72/30 aluminum padlock a substitute for a Medeco G8R on a cargo container?
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, a size and material built for safety lockout duty on energy isolation points. The Medeco 521 G8R has a solid 300-series cast stainless steel body with sealed weather-tight construction and a 5/16 inch or 7/16 inch shackle in stainless or hardened steel, which is what container doors, trailer doors, and perimeter gates call for. The two are not interchangeable on a freight or gate application.
9) Which padlock takes the same 5/16 inch shackle diameter as the Medeco G8R?
The Schlage KS23D/KS23F is a brass padlock with a 5/16 inch diameter shackle, matching one of the two shackle diameters the Medeco 521 G8R is built in; the G8R is also offered with a 7/16 inch shackle, and either diameter can be specified in stainless steel or hardened steel. If a hasp or staple opening is already sized for 5/16 inch, both will pass through it. The bodies differ: the KS23D/KS23F is brass, while the G8R is solid 300-series cast stainless steel with sealed weather-tight construction.
10) What shackle diameters does the Medeco G8R weather-tight padlock come in?
Two: 5/16 inch and 7/16 inch. The 5/16 inch will pass through most standard hasps and container lock boxes; the 7/16 inch is the heavier section and needs a hasp opening cut for it, so measure the eye on your existing hasp before you order. Both diameters are available in either the stainless or the hardened shackle.
11) What is the difference between the Medeco G8R and a standard commercial padlock like the Sargent 858?
Different jobs. The G8R is a weather-tight padlock with a sealed body and a cap over the cylinder opening, sold less cylinder so you fit a Medeco pop-out mechanical or a Nexgen/XT electronic cylinder. The Sargent 858 is a conventional non-key-retaining padlock with a stainless steel shackle in US4 satin brass, and Sargent also offers the 60-858-2 with a 2 inch stainless shackle if you need more clearance through a thick hasp. If your lock lives in weather and road spray, or you want audit capability, the G8R is the one. If it is an interior or sheltered opening on an existing Sargent key system, the 858 family keeps you on one keyway.
12) I need padlocks for lockout tagout, not security. Is the Medeco G8R the right choice?
No. The G8R is a commercial security padlock built for attack and weather resistance, and it is sold less cylinder, which is the opposite of what a safety lockout program wants. For lockout tagout look at the ABUS 72/30 anodized aluminum safety padlock with a 1-1/4 inch body and 3/16 inch shackle, or the ABUS 74/40 insulated safety padlock with a 6-pin cylinder, 1/4 inch shackle and 1-1/2 inch body. Those are the light, color-coded, one-key-per-worker style locks that energy isolation calls for.
13) Why is a Medeco G8R padlock better for a marine or coastal site than an aluminum body padlock?
Material. The G8R body is solid 300-series cast stainless steel with a stainless shackle option, and the whole assembly is sealed with a capped cylinder opening, which is what salt air and washdown demand. The aluminum-core alternatives in the padlock range, like the ABUS 76/40 plastic-covered aluminum core padlock, are lighter and cheaper to hang in quantity but they are not the same corrosion and attack proposition. ABUS also builds the T84MB/30 Nautic with a black sleeve for marine use, at a much smaller 13/64 inch shackle, so that one is a deterrent lock rather than a security lock.
14) What padlock should I use outdoors if I need a key retaining lock instead of the Medeco G8R?
The Sargent 758 is a key retaining standard padlock in a US4 satin brass finish, meaning the key cannot be withdrawn while the lock is open. Its sibling, the Sargent 858, is non-key retaining with a stainless steel shackle in the same US4 satin brass. The Medeco 521 G8R is supplied less cylinder for Medeco mechanical pop-out (t-handle) or Nexgen and XT electronic cylinders, so key retention there is a function of the cylinder specified rather than the body. Where a written procedure requires the key to stay captive until the lock is closed, the 758 covers it directly.
15) What is the difference between the Medeco 521 G8R and the Sargent 82-856 for a high security outdoor opening?
The Sargent 82-856 is a non-key retaining padlock in the KESO series with a 2 inch by 2 inch brass case and a stainless steel shackle. The Medeco 521 G8R uses a solid stainless steel body with sealed construction and a weather seal cap on a steel cable to keep water and road grime out of the cylinder opening, and it is UL 437 listed with a mechanical cylinder. Both are high security bodies; the deciding factor is usually the keyway system the site is standardized on and whether the lock sits exposed to weather and road spray.
16) What is a smaller corrosion resistant padlock for a marine or coastal application than the Medeco G8R?
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, sold in a three-pack, sized for lockers, small gates, and gear boxes in salt air. The Medeco 521 G8R is the heavier option for the same environment, with a solid 300-series cast stainless steel body, sealed construction that protects the cylinder from water and road grime, and a 5/16 inch or 7/16 inch stainless or hardened steel shackle. Choose by the opening: the T84MB/30 fits small hasps, the G8R suits container and perimeter hardware.
17) If I need an audit trail on a padlock, is there an alternative to the Medeco G8R that does that?
Among the padlocks in the comparable range, the Medeco 521 G8R is the one that carries it in the body: it accepts Medeco Nexgen or XT electronic cylinders, which turn it into a portable access control point with audit and control features, and it also takes Medeco mechanical pop-out (t-handle) cylinders for patented key control and pick resistance. The Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle and the Sargent 858 is a non-key retaining padlock with a stainless steel shackle in US4 satin brass; both are mechanical bodies keyed to a master system rather than electronic. Where the requirement is knowing who opened a remote gate or container and when, specify the G8R with a Nexgen or XT cylinder.
18) What finish is the Medeco G8R 521 padlock body?
The lockbody is 26 Satin Chrome. On a stainless body that reads as a bright, low-glare silver, which matters if you are matching a run of padlocks across a facility and want them to look uniform on the fence line or the container doors.
19) Is the Medeco G8R padlock rated for commercial use?
It is a commercial specification lock, not a residential one. Solid stainless steel body, sealed against water and grime, shackle available in hardened steel for attack resistance, and UL 437 Listed with a mechanical cylinder. It is specified for industrial and warehouse facilities, perimeter gates, intermodal freight, and transport security rather than a shed door.
20) Is there a padlock with a covered body that will not mar a painted gate or door the way a bare metal lock can?
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, and the ABUS 74/40 is an insulated safety padlock with a 6-pin cylinder, a 1/4 inch shackle diameter, and a 1-1/2 inch body width; both put a non-metallic jacket between the lock body and the surface it swings against. The Medeco 521 G8R has an exposed solid stainless steel body and is built for cargo containers, trailer doors, gates, and vending machines where corrosion and attack resistance drive the choice.
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Does the Medeco G8R-521-ST-51 come with a warranty?
Absolutely. The Medeco G8R-521-ST-51 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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