BEST 21B Series Bronze Shackle...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$96.00
$87.21
BEST Best 21B Series Bronze Shackle Padlock 5/16" Diameter BES-21B70T

BEST 21B Series Bronze Shackle Padlock with Removable Core - 5/16" Diameter

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Model: 21B70T
$96.00
$87.21

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

$96.00
$87.21
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BEST 21B Series Bronze Shackle Padlock with Removable Core - 5/16" Diameter

Professional Interchangeable Core Padlock System

The BEST 21B Series padlock features a standard removable core that integrates seamlessly with the entire BEST product line for comprehensive master keying capabilities. This bronze shackle padlock with 5/16" diameter construction provides reliable security with the flexibility of immediate rekeying at minimal cost through the interchangeable core system.

Professional Features & Benefits

  • Interchangeable Core System: Standard removable core allows integration with most BEST product line for unified master key systems and future expansion capabilities.
  • Immediate Rekeying: Interchangeable core design enables quick rekeying at minimal cost without replacing the entire padlock.
  • Master Key Compatibility: STANLEY/BEST locks of any type, size or style can be masterkeyed into one comprehensive system.
  • Durable Construction: Bronze shackle with 5/16" diameter provides reliable strength for security applications.
  • Versatile Configuration Options: Available with key retained or non-key retained operation for different security requirements.
  • Corrosion Resistance: Optional corrosion-resistant treatment available for demanding environmental conditions.
  • Professional Accessories: Compatible with bronze or steel chains and special case embossing options for brass cases.

Technical Specifications

Installation & Operation

This padlock is designed for use with compatible BEST interchangeable core systems. Refer to manufacturer documentation for proper core installation and master key system integration. Ensure compatibility with existing BEST hardware before installation.

Professional Applications

  • Commercial Building Security Systems
  • Industrial Facility Access Control
  • Educational Institution Security
  • Healthcare Facility Equipment Protection
  • Multi-Tenant Property Management
  • Government and Municipal Applications
  • Warehouse and Distribution Centers

Why Choose BEST Quality?

BEST padlocks deliver professional-grade security with interchangeable core technology that standardizes access control across entire facilities. The bronze shackle construction with 5/16" diameter provides dependable strength while the removable core system offers unmatched flexibility for master key expansion and cost-effective rekeying. Engineered for demanding commercial applications where reliable security and system integration are essential.

Manufacturer Resources

B Series Padlocks

Product Specs

Product Group:
Other / Miscellaneous Hardware
Product Subgroup:
Padlocks
Subcategory:
Padlocks
Product Type:
Padlocks
Shackle Width:
7/8"
Product Lockbody Color:
626 - Satin Chromium Plated
Product Category:
Other / Miscellaneous Hardware
Product Substrate:
Stainless Steel
Department:
Door Hardware

BEST 21B70T – Frequently Asked Questions

1) Will a BEST 21B padlock work on my existing BEST master key system?
That's the whole point of the 21B. It takes the standard BEST removable interchangeable core, so it drops into an existing BEST master key system alongside the locks already on your doors. STANLEY/BEST locks of any type, size, or style can be keyed into one system, and when a key goes missing you swap the core instead of the padlock. If you run BEST cores across a facility, this padlock joins that system rather than adding a second key to the ring.
2) What shackle sizes does the BEST 21B padlock come in?
Shackle length runs 3/4 inch, 1-1/2 inch, 2 inch, and 4 inch, all on a 5/16 inch diameter bronze shackle with a 7/8 inch shackle width (the clearance between the legs). Pick the length off what you are locking through: 3/4 inch for a tight hasp where you want minimal exposed shackle, 4 inch when you need to reach through a chain link or a thick staple. The 7/8 inch width is the same across the range, so it is the hasp opening that has to accept it.
3) What is the difference between key retained and non-key retained on a BEST 21B padlock?
Key retained (suffix T) holds the key captive while the padlock is open, so the key cannot be walked away with and the lock cannot be left hanging unlocked. Non-key retained (suffix L) releases the key in either position, which is what you want when one person carries a key and locks a run of padlocks in sequence. Key retained suits lockout and tenant applications where an open padlock left dangling is the failure you are guarding against; non-key retained suits gates and route work. Both are ordered options on the 21B, so choose the one your procedure calls for.
4) Can I get a BEST 21B padlock with a cut resistant shackle for an exposed outdoor gate?
Two options cover that. XSPL gives you a cut resistant shackle on the standard body, and SH adds a shroud around the shackle along with the cut resistant shackle, so a bolt cutter has far less shackle to bite on. For weather rather than attack, the WC weather cover option protects the keyway and core on an exposed opening. These are ordered options, so specify the one you need when you place the order rather than adding it later.
5) What is the alternative to a BEST 21B if we do not run BEST cores in our building?
An interchangeable core padlock only pays off if the rest of your hardware takes the same core. If your facility is keyed in Sargent, the Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle and keys into that system instead. If you want a padlock that does not join any master key system, the ABUS 72/30 anodized aluminum safety padlock and the ABUS 76/40 plastic covered aluminum core padlock are standalone locks. For a comparable 5/16 inch shackle diameter from another brand, the Schlage KS23D/KS23F brass padlock is the closest match on shackle stock.
6) What is the closest equivalent to a BEST 21B padlock if the facility is keyed to a Sargent system instead?
The Sargent 60-858-2 is the removable core padlock in the Sargent line, supplied with a 2 inch stainless steel shackle, so it takes a Sargent core the way the 21B takes a BEST interchangeable core. The BEST 21B uses a standard removable core that master keys with the rest of the BEST product line and comes in 3/4 inch, 1-1/2 inch, 2 inch and 4 inch shackle lengths, so a 2 inch 21B and the 60-858-2 sit at the same shackle clearance. Pick by which core your existing master key system runs on, since the padlock has to accept the core your keys are cut for.
7) For an outdoor gate or wash-down area, what padlock holds up better than a bronze shackle BEST 21B?
The Medeco 521 G8R is a weather-tight padlock with a solid stainless steel body, supplied less pop-out cylinder, and it is built for exposure. The Medeco 54515G XT is an electronic indoor/outdoor padlock, non-key retaining, with a 5/16 inch shackle diameter, the same shackle diameter as the BEST 21B. The 21B itself can be ordered with a WC weather cover, and its cases carry a corrosion resistant treatment option, so it is a route to an exterior application if you want to stay on the BEST core system rather than move to a separate cylinder platform.
8) Can an ABUS safety padlock be used in place of a BEST 21B for lockout tagout?
It can, but they are different tools. 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 76/40 is a plastic covered aluminum core padlock with a 1/4 inch shackle diameter and 1 37/64 inch width, both lighter shackles than the 5/16 inch shackle diameter of the BEST 21B. Safety padlocks are meant to be keyed differently from the building system so a single key cannot release another worker's lock, while the 21B is built the opposite way, on a removable core that master keys into the facility system. Use the ABUS units for energy isolation and keep the 21B for security openings.
9) Is the Medeco 5260 a drop-in replacement for a BEST 21B padlock?
No. The Medeco 5260 is a 52 Series brass body padlock with a 7/16 inch shackle diameter and M3 key technology in satin chrome, so its shackle is a heavier diameter than the 5/16 inch shackle of the BEST 21B and will not pass through a hasp or chain link sized to the 21B. It also runs on Medeco M3 keying rather than a BEST interchangeable core, so it cannot be brought into an existing BEST master key system. Check the hasp opening before swapping between the two.
10) Which padlock should I choose over a BEST 21B if the lock has to be electronically audited?
The Medeco 54515G XT is an electronic indoor/outdoor padlock, non-key retaining, with a 5/16 inch shackle diameter and cylinder included. It matches the BEST 21B on shackle diameter, so it fits the same hasps, but it is an electronic credential platform rather than a mechanical removable core, which is what the 21B uses to master key with the rest of the BEST line. Choose the XT where you need electronic key control on the padlock and the 21B where the padlock has to sit inside an existing mechanical master key system.
11) How do I keep a padlock attached to the gate so it does not get lost when the gate is open?
Order the 21B with a chain. M1 gives a bronze chain, M5 a galvanized steel chain, and M is the case drilled for a clevis with no chain supplied, which is what you want if you are attaching your own chain or cable. Standard is no chain at all. The chain keeps the padlock tethered to the hasp or gate frame, which is the usual fix on utility enclosures and yard gates where a loose padlock ends up on the ground.
12) Is the BEST 21B padlock suitable for outdoor or coastal use?
Bronze shackle stock resists corrosion better than plain steel, the substrate is stainless steel, and an optional corrosion resistant treatment can be specified for demanding environments. Add the WC weather cover if the keyway will sit exposed to rain or spray. For a fully sealed marine style body instead, the Medeco 521 G8R weather-tight padlock has a solid stainless steel body, and the ABUS T84MB/30 Nautic uses a black sleeve over the body.
13) Does the BEST 21B padlock come with a core and keys, or do I order those separately?
The 21B is built around the standard BEST removable core, and the core is what carries your keyway and keying. Facilities already running BEST typically pin their own cores from stock so the padlock lands in the existing system on day one. Decide your core and keying arrangement at the same time you pick shackle length and key retention, because those are the four things that define the part you are ordering.
14) Can I use a BEST 21B padlock for electrical lockout tagout?
For lockout tagout, the padlocks purpose built for it are a better fit. The ABUS 72/30 is an anodized aluminum safety padlock with a 1-1/4 inch body and 3/16 inch shackle, and the ABUS 74/40 is an insulated safety padlock with a 6-pin cylinder, 1/4 inch shackle, and 1-1/2 inch body. Those thinner shackles and non-conductive bodies are what LOTO procedures usually call for. The 21B, with its 5/16 inch bronze shackle and interchangeable core, is built for building and facility security where the padlock has to sit in your master key system.
15) How do I rekey a BEST 21B padlock after a tenant turnover or lost key?
Pull the core with a control key and drop in a new one. Nothing else on the padlock changes, so a turnover across a hundred units means a bin of cores, not a hundred new padlocks. That is the practical reason property managers and MRO buyers standardize on interchangeable core in the first place, and it is why the padlock, the door locks, and the cabinet locks should all take the same core.
16) Which padlock should I use instead of the BEST 21B when I do not need interchangeable core and just want a fixed cylinder brass body?
The Schlage KS23D/KS23F is a brass padlock with a 5/16 inch diameter shackle, matching the 5/16 inch shackle diameter of the BEST 21B, and it is a conventional cylinder padlock rather than a removable core one. The 21B's removable core lets you rekey the lock by pulling and swapping the core, which is the feature to give up if the openings are not part of a master key system. The Sargent 758 is another fixed option, a key retaining standard padlock in a US4 satin brass finish.
17) What is the difference between the BEST 21B and the Sargent 858 when a non-key-retaining padlock is specified?
The Sargent 858 is a non-key retaining padlock with a stainless steel shackle in a US4 satin brass finish, and the Sargent 82-856 is a non-key retaining padlock with a 2 inch by 2 inch brass case and stainless steel shackle. The BEST 21B is ordered as either L for non-key retained or T for key retained, so non-key-retaining is a keying option rather than a separate model number. If the specification only calls for the key to release when the lock is open, all three answer it; the 21B is the one that also carries the removable core for rekeying.
18) Which padlock resists bolt cutters better if a BEST 21B bronze shackle is being cut off a yard gate?
Stay within the 21B and order the cut resistant shackle option, XSPL, or the SH configuration, which is shrouded with a cut resistant shackle so the body shields the shackle from jaw access. Among other bodies, the Medeco 521 G8R is a weather-tight padlock built on a solid stainless steel body. A shrouded 21B keeps the same removable core, so the yard gate stays on the same master key system after the upgrade.
19) Is there a padlock with an insulated or non-conductive body to use where a BEST 21B is not appropriate?
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, and the ABUS 76/40 is a plastic covered aluminum core padlock with a 1/4 inch shackle diameter. The BEST 21B is a bronze shackle padlock on a stainless steel substrate with a satin chromium plated lock body, all conductive materials. For electrical work where a non-conductive or insulated body is called for, the ABUS units answer that condition; the 21B answers key system integration.
20) What finish is the BEST 21B padlock body?
The lockbody is 626 satin chromium plated, the standard commercial satin chrome finish, so it matches the 626 lever and cylinder hardware already on most commercial openings. If you need a brass tone padlock to match existing hardware instead, the Sargent 758 comes in US4 satin brass, and the Medeco 5260 brass body padlock is offered in satin chrome.
21) If I need the padlock tethered so it does not get lost, is there an alternative to the BEST 21B?
The 21B itself covers it. It is ordered with a bronze chain as option M1, a galvanized steel chain as option M5, or as M with the case drilled and no clevis or chain if you are supplying your own tether. That keeps the removable core and the 5/16 inch bronze shackle unchanged while adding the chain, rather than moving to a different padlock body to get a tethered assembly.
How fast can I get the BEST 21B70T 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 BEST 21B70T come with a warranty?
Absolutely. The BEST 21B70T 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 BEST 21B70T?
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 BEST 21B70T from ZenSupply?
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