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AMERICAN LOCK A20MK BRASS BODY REKEYABLE PADLOCK (HIDDEN SHACKLE) OVERVIEW
A20MK Brass Body Rekeyable Padlock (Hidden Shackle). Non-Rekeyable Padlocks - Solid Brass.
The American Lock No. A20MK Solid Body Padlock features a 1-3/4in (44mm) wide solid brass body to resist corrosion and a 1-1/8in (29mm) 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 A20MK Brass Body Rekeyable Padlock (Hidden Shackle) for easy installation and dependable door hardware solution.
AMERICAN LOCK A20MK 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
- 1-1/8in (28mm) 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 A20MK 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:
- A20MK
- Product Color:
- Gold
- Product Shackle Length:
- 1-1/8"
- Product Style:
- Non-Rekeyable Padlocks
- Product Category:
- Other / Miscellaneous Hardware
- Product Substrate:
- Brass
- Product Width:
- 1-3/4"
- Department:
- Door Hardware
American Lock AME-A20MK 2KEY – Frequently Asked Questions
1) Will the American Lock A20MK fit my hasp? What is the shackle clearance?
The A20MK gives you a 1-1/8 inch shackle length (vertical clearance) with a 3/4 inch shackle width between the legs, on a 5/16 inch diameter shackle. That is a short, tight shackle, so the hasp staple or chain link has to pass through a 3/4 inch gap and leave room under a 1-1/8 inch opening. Measure the staple thickness plus whatever you are locking through before you commit. The body itself is 1-3/4 inches wide.
2) What does the MK in American Lock A20MK mean for keying?
MK means master keyed: each A20MK is keyed different from the next, and all of them operate under a master key you specify. That is the setup a property manager or self-storage operator wants when every tenant carries their own key but maintenance needs one key for the whole run. If you would rather every lock on the job take the same change key under a master, the A20KAMK is the keyed alike master keyed version of the same brass padlock.
3) What is the closest brass-body alternative to the American Lock A20MK with the same shackle diameter?
The Schlage KS23D/KS23F is the nearest match: it is a brass padlock with a 5/16 inch diameter shackle, the same shackle diameter the A20MK carries. The A20MK adds a 1-3/4 inch wide brass body with a 1-1/8 inch shackle length, so confirm clearance at the hasp before swapping, and note that the A20MK is supplied keyed different within a master key system.
4) The A20MK shackle is too short to get through my hasp - what padlock gives more shackle clearance?
The A20MK uses a 1-1/8 inch shackle length, which is a short hidden-shackle configuration. For a taller hasp or a chain link, the Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, and the Sargent 82-856 pairs a 2 inch by 2 inch brass case with a stainless steel shackle. Both give far more vertical clearance than the A20MK's shrouded shackle.
5) I need the padlock to accept my facility's interchangeable core instead of a factory master key system - what should I order?
The A20MK is built around a non-rekeyable 5-pin APTC12 cylinder and ships keyed different under a master key. If your facility standardizes on its own cores, the Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, and the Sargent 82-856 is a non-key-retaining padlock in the KESO series with a brass case. Those let you carry the site keyway rather than adding a separate key to the ring.
6) Can I use the A20MK as a lockout/tagout padlock?
The A20MK is a solid brass security padlock, not a safety lockout device. For lockout/tagout use, 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 are the lighter, non-conductive styles intended for energy isolation; the A20MK's boron alloy shackle and brass body are aimed at theft resistance.
7) Is a brass padlock the right choice for outdoor, marine, or wash-down areas?
That is exactly what the A20MK solid brass body is for. Brass resists corrosion in salty, caustic and wet conditions better than plated steel, which is why American Lock points this one at marine and offshore work, docks, sheds and exposed storage. The shackle is hardened boron alloy steel for cut resistance rather than brass, so it stays tough while the body handles the environment.
8) How many keys come with each A20MK padlock, and can I order it with none?
Keys per lock is something you pick when you order. The choices are 0, 1, 2 (the standard), 3, or 4 keys per lock. Locksmiths and facilities that cut and issue their own keys from an existing master system often take the 0-key option; a landlord handing out one tenant key plus a spare usually wants 2.
9) Can I get the A20MK padlock with a chain attached?
Yes. Order it with a #40 sash chain, 9 inches (229mm) long, zinc plated, or with no chain at all. The chain option is the one to take when the lock has to stay tethered to a gate, cabinet or cover so it does not walk off when it is open.
10) How pick and pry resistant is the American Lock A20MK cylinder and locking mechanism?
Two things do the work. The cylinder is a 5-pin APTC12 with serrated pins, which frustrates picking, and the shackle is held by a dual stainless steel ball bearing mechanism that resists pulling and prying. Paired with the short 1-1/8 inch shackle, there is very little exposed steel for a bolt cutter or bar to get onto.
11) What else should I look at instead of the A20MK brass padlock?
A few brass-bodied alternatives cover different needs. The Schlage KS23D/KS23F is a brass padlock with the same 5/16 inch shackle diameter, so it is the closest straight swap on shackle size. The Medeco 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. For a small-format interchangeable core program, the Sargent 60-858-2 is a removable core padlock with a 2 inch stainless steel shackle, which also gives you far more clearance than the A20MK's 1-1/8 inch shackle for chains and thick hasps.
12) For a saltwater dock application, how does the A20MK compare to a stainless body padlock?
The A20MK uses a solid brass body for corrosion resistance in caustic, corrosive and salty environments, paired with a hardened boron alloy shackle. The Medeco 521 G8R is a weather-tight padlock with a solid stainless steel body, supplied less pop-out cylinder. Brass and stainless are both used on the waterfront; the practical split is that the Medeco 521 arrives without a cylinder so you supply keying, while the A20MK comes as a complete master-keyed unit.
13) Does the A20MK retain the key when unlocked, and what if I need a non-key-retaining padlock?
If your procedure requires the key to come out while the lock is open, the Sargent 858 is a non-key-retaining padlock with a stainless steel shackle in US4 satin brass, and the Sargent 758 is the key-retaining version of the same style in US4 satin brass. The A20MK is a hidden-shackle brass body lock ordered with 0 through 4 keys per lock depending on how you stock keys for the master system.
14) I want electronic audit trail on padlocks instead of mechanical master keying - what replaces the A20MK?
The Medeco 54515G is an XT electronic indoor/outdoor padlock, non-key retaining, with a 5/16 inch shackle diameter and cylinder included - the same 5/16 inch shackle diameter as the A20MK, so hasp fit is comparable. The A20MK is purely mechanical, keyed different under a master key, with a non-rekeyable 5-pin cylinder.
15) How do I buy A20MK padlocks in bulk for a whole facility?
These ship 6 to a shelf pack and 24 to a master carton, so a large self-storage or multi-family rollout orders in those multiples. Because each lock is keyed different under a common master, you can standardize a full building on one master key and still issue unique keys per door.
16) Is the A20MK meant for commercial use or is it a homeowner padlock?
It is classed as commercial door hardware, a solid body padlock built for self-storage units, lockers, workshops, garages and marine or offshore security. The gold brass finish and solid body construction are aimed at operators running many openings, not a one-off shed lock, though it works fine for that too.
17) What is the difference between the American Lock A20, A21 and A22 brass padlocks?
They are the same brass solid body family split by keying arrangement and shackle offering. A20 covers the keyed different, keyed alike (A20KA), master keyed (A20MK) and keyed alike master keyed (A20KAMK) versions, and A21 and A22 carry the identical four keying variants. Pick the number for the body and shackle you need, then the suffix for how you want it keyed.
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Does the American Lock AME-A20MK 2KEY come with a warranty?
Absolutely. The American Lock AME-A20MK 2KEY is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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