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AMERICAN LOCK A21MK BRASS BODY REKEYABLE PADLOCK (HIDDEN SHACKLE) OVERVIEW
A21MK Brass Body Rekeyable Padlock (Hidden Shackle). Non-Rekeyable Padlocks - Solid Brass.
The American Lock No. A21MK Solid Body Padlock features a 1-3/4in (44mm) wide solid brass body to resist corrosion and a 2in (51mm) tall, 5/16in (8mm) diameter hardened boron alloy shackle for superior cut resistance. Ideal for harsh environments, a dual ball bearing mechanism resists pulling and prying while a 5-pin APTC12 non-rekeyable cylinder with serrated pins is virtually impossible to pick.
Buy the American Lock A21MK Brass Body Rekeyable Padlock (Hidden Shackle) for easy installation and dependable door hardware solution.
AMERICAN LOCK A21MK BRASS BODY REKEYABLE PADLOCK (HIDDEN SHACKLE) PRODUCT FEATURES
- 1-3/4in (44mm) wide solid brass body
- Brass body provides extra corrosion resistance in caustic, corrosive, salty environments
- 2in (51mm) tall, 5/16in (8mm) diameter hardened boron alloy steel shackle for superior cut resistance
- Dual stainless steel ball bearing locking mechanism that resists pulling and prying
- Non-rekeyable 5-pin APCT12 cylinder prevents picking
- Marine & Offshore Security
- Self-Storage Units & Lockers
- Marine Environments
- Sheds, Workshops & Garages
- Keying Options
- Laser Engraving & Custom Marking
- Shackle Options
AMERICAN LOCK NON-REKEYABLE PADLOCKS - SOLID BRASS COLLECTION
American Lock A20 (A20KD) Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Different
American Lock A20KA Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Alike
American Lock A20MK Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Different (Master Keyed)
American Lock A20KAMK Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Alike (Master Keyed)
American Lock A21 (A21KD) Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Different
American Lock A21KA Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Alike
American Lock A21MK Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Different (Master Keyed)
American Lock A21KAMK Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Alike (Master Keyed)
American Lock A22 (A22KD) Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Different
American Lock A22KA Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Alike
American Lock A22MK Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Different (Master Keyed)
American Lock A22KAMK Brass Body Rekeyable Padlock (Hidden Shackle), Keyed Alike (Master Keyed)
RESOURCES & DOWNLOADS
American Lock A21MK Brass Body Rekeyable Padlock (Hidden Shackle) Catalog
Manufacturer Resources
Product Specs
- Subcategory:
- Solid Body Padlocks
- Shelf Pack Qty:
- 6
- Master Carton Qty:
- 24
- Shackle Width:
- 3/4"
- Shackle Diameter:
- 5/16"
- Keyed:
- Yes
- Product Group:
- Other / Miscellaneous Hardware
- Product Subgroup:
- Padlocks
- Product Type:
- Padlocks
- Commercial/Residential:
- Commercial
- Product Model:
- A21MK
- Product Color:
- Gold
- Product Shackle Length:
- 2"
- Product Style:
- Non-Rekeyable Padlocks
- Product Category:
- Other / Miscellaneous Hardware
- Product Substrate:
- Brass
- Product Width:
- 1-3/4"
- Department:
- Door Hardware
American Lock AME-A21MK 2KEY – Frequently Asked Questions
1) Will the American Lock A21MK padlock fit through my hasp?
Check the shackle clearance rather than the body. The A21MK gives you 3/4 inch between the shackle legs, 2 inches of shackle length, and a 5/16 inch diameter shackle, so the staple or chain link has to accept a 5/16 inch bar and sit inside that 3/4 inch gap. The brass body itself is 1-3/4 inches wide, which is what you need room for against the hasp plate.
2) What does the MK in American Lock A21MK mean for keying?
MK is the master keyed, keyed different version: every lock gets its own individual key, and a master key opens them all. That is the setup a property manager or maintenance supervisor wants when each tenant, cage, or storage unit needs its own key but one person needs access to everything. If you want every lock on the same change key instead, the keyed alike A21KA is the version to order, and A21KAMK is keyed alike under a master.
3) Is a brass padlock actually better than steel for a dock or coastal site?
That is the reason to pick this one. The A21MK uses a solid brass body, which holds up in salty, caustic, and corrosive air far better than a plated steel body, and the shackle is hardened boron alloy steel for cut resistance. It is aimed at marine and offshore work, exterior sheds and workshops, and self-storage. If the opening is indoors and dry, you are paying for corrosion resistance you will not use.
4) What is the closest brass-body padlock to the American Lock A21MK with the same shackle diameter?
The Schlage KS23D/KS23F is the nearest match on both body material and shackle: it is a brass padlock with a 5/16 inch diameter shackle, the same shackle diameter the A21MK carries on its brass body. The A21MK differs in how it is keyed and supplied - it is a master keyed, keyed different padlock with a 1-3/4 inch body width and a 2 inch shackle length, and it can be ordered with or without a #40 zinc plated sash chain 9 inches long.
5) I need a padlock on an existing interchangeable core keying system instead of the American Lock A21MK - what should I look at?
The A21MK uses a non-rekeyable 5-pin APTC12 cylinder, so it is keyed at the factory rather than cored to your system. If the padlock has to accept your facility's cores, the Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, and the Medeco 54515G is an XT electronic indoor/outdoor padlock supplied with a cylinder and a 5/16 inch shackle diameter - the same shackle diameter as the A21MK.
6) For a marine or salt-air application, is the American Lock A21MK the right choice or is there a stainless option?
The A21MK is built for that duty - a solid brass body for corrosion resistance in caustic, corrosive and salty environments, with a hardened boron alloy shackle. If the specification calls for a stainless body rather than brass, the Medeco 521 G8R is a weather-tight padlock with a solid stainless steel body, supplied less pop-out cylinder, so a cylinder has to be ordered with it.
7) How many keys come with each American Lock A21MK padlock?
You choose. The A21MK is ordered with 0, 1, 2, 3, or 4 keys per lock, with two keys per lock being the standard option. Fleet buyers running a master keyed system often take zero or one key per lock and pull change keys from a separate cut order.
8) Can I get the A21MK padlock with a chain attached?
Yes. Each A21MK can be ordered with a #40 sash chain, 9 inches long and zinc plated, or with no chain at all. The chain option keeps the lock tethered to the gate, panel, or cabinet so it does not get set down and lost, which is the usual reason crews specify it.
9) How is the A21MK different from the American Lock A20 and A22?
Body and construction are the same family; the difference is shackle height. The A20, A21, and A22 are all solid brass body padlocks in the same non-rekeyable solid brass line, and the A21MK carries a 2 inch shackle. Pick by how much shackle clearance the hasp or chain needs, then pick the keying suffix (KD for keyed different, KA for keyed alike, MK for master keyed, KAMK for keyed alike under a master).
10) Is the American Lock A21MK hard to pick or pry open?
Two things do that work. A dual stainless steel ball bearing locking mechanism grips the shackle on both legs, which resists pulling and prying attacks on the shackle heel and toe. The cylinder is a 5-pin unit with serrated pins, which frustrates picking. Combined with the shrouded hidden-shackle body, there is very little shackle exposed for bolt cutters.
11) What are the alternatives to the American Lock A21MK brass padlock?
A few from other lines. The Schlage KS23D/KS23F is also a brass padlock with a 5/16 inch shackle diameter, so it is the closest straight swap on shackle size. Medeco's 5260 is a 52 Series brass body padlock with a heavier 7/16 inch shackle and M3 key technology if you need high-security keying. Sargent's 758 is a key retaining brass padlock (the key will not come out while the lock is open), while the 858 is non-key retaining. For lockout/tagout rather than security, look at the ABUS 72/30 aluminum safety padlock instead, which is a different job entirely.
12) Will a safety lockout padlock work in place of the American Lock A21MK?
No - those are a different class of lock. The ABUS 72/30 is an anodized aluminum safety padlock with a 1-1/4 inch body width and 3/16 inch shackle diameter, and the ABUS 74/40 is an insulated safety padlock with a 6-pin cylinder, 1-1/2 inch body and 1/4 inch shackle. Both are lighter-bodied lockout/tagout locks. The A21MK is a solid brass body padlock 1-3/4 inches wide with a 5/16 inch hardened boron alloy shackle and a dual stainless steel ball bearing locking mechanism intended for security rather than energy isolation.
13) I need a heavier brass padlock than the American Lock A21MK for a high-security gate - what is available?
The A21MK has a 5/16 inch diameter shackle on a 1-3/4 inch wide brass body. For a thicker shackle in a brass body, the Medeco 5260 is a 52 Series brass body padlock with a 7/16 inch shackle diameter, M3 key technology and a satin chrome finish. Note the A21MK uses a non-rekeyable factory-keyed cylinder while the Medeco is built around the M3 key system.
14) Does the American Lock A21MK retain the key when the shackle is open, and what are the alternatives either way?
If key retention is the deciding feature, the Sargent 758 is a key retaining padlock in a US4 satin brass finish, while the Sargent 858 is non-key retaining with a stainless steel shackle in the same US4 satin brass finish. The A21MK is a master keyed brass body padlock with a 2 inch shackle length and can be supplied with 1, 2, 3 or 4 keys per lock, or with no keys when keys are being issued separately.
15) How many A21MK padlocks come in a case if I'm buying for a whole facility?
Case quantities on the A21MK are 6 per shelf pack and 24 per master carton, which is the way most self-storage and MRO buyers order them when standardizing a site.
16) Can the A21MK be engraved with our facility or unit numbers?
Yes, laser engraving and custom marking are offered on the A21MK, which is how storage operators and fleet managers tag locks to a unit, gate, or department. Custom shackle options and keying options are also part of the program.
17) What should I use instead of the American Lock A21MK if the padlock will scratch a painted or finished surface?
Coated-body padlocks are the usual answer there. The ABUS 76/40 is a plastic-covered aluminum core padlock with a 1/4 inch shackle diameter and 1-37/64 inch width, and the ABUS T84MB/30 Nautic has a black sleeve over the body with a 13/64 inch shackle diameter and 1-17/64 inch body width. The A21MK is a bare solid brass body 1-3/4 inches wide with a 5/16 inch hardened shackle, so it is the heavier lock of the three but has no protective sleeve.
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Does the American Lock AME-A21MK 2KEY come with a warranty?
Absolutely. The American Lock AME-A21MK 2KEY is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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