Master Lock 21

Master Lock

Removeable Cylinder Padlock, 15/16In H, KD

21 37777
Average Rating: 5
Read Reviews (1) Write a Review
$23.15+ 4 Business Day Shipping $7.15


ItemKeyed Padlock
TypeDual Bumper, Removable Cylinder
Control Key Registration RequiredNo
Key ControlNo
Shackle Dia.5/16"
Shackle Height15/16"
Shackle Width3/4"
Key TypeDifferent
Shackle MaterialHardened Steel
Body Size Width1-3/4"
Body Size Thickness7/8"
Body MaterialSteel
Number of Bumpers2
Number of Pins5
ShackleHardened Steel and Alloy
WeatherabilitySome Corrosion Resistance
Shackle ConfigurationOpen
Security LevelHigh Security
Weight 0.550000


Keyed Padlock, Dual Bumper, Removable Cylinder, Control Key Registration Required No, Key Control No, Shackle Dia. 5/16 In., Shackle Height 15/16 In., Shackle Width 3/4 In., Key Type Different, Shackle Material Hardened Steel, Body Size Width 1-3/4 In., Body Size Thickness 7/8 In., Body Material Steel, Number of Bumpers 2, Number of Pins 5, Hardened Steel and Alloy, Silver, Steel, Weatherability Some Corrosion Resistance, Shackle Configuration Open, High Security

Removable Cylinder Padlocks
  • Change or rekey the cylinder whenever security is compromised due to lost keys or employee turnover. Feature 5-pin tumbler cylinders, a dual lever-locking mechanism, and proprietary rustproofing. 1U158 and 1U157 have a round body design to deflect hammer blows and antisaw pins to resist cutting. 1U181 and 1U180 have extended-clearance shackle for special applications like commercial refrigerators. All locks include 2 brass keys.

Customer Reviews

Average Product Rating: 5
based on 1 reviews

master # 21 rekeyable

Monday, April 25, 2011

Master locks rock and with rekeyeables you don't lose your investment if you lose or have a key compromised. Just have them rekeyed or with a little practice and supplies do it yourself. I love them. was fast, easy and the product was just as described and free shipping on this item sealed the deal.

Exactly what I wanted.

I like them just the way they are.

Submitted by abejr
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