Toggle menu
FREE shipping over $500
877-365-5625
  • 0
  • Shop by Industry
  • Locks
  • Electronics
  • Exit Devices
  • Hardware
  • Manufacturer
  • Safes
  • Key Machine
  • Shop by Brand
  • Corbin Russwin
  • Von Duprin
  • Best
  • Schlage
  • Sargent
  • Stanley Hardware
  • Rixson
  • Falcon
  • Yale
  • PHI
  • View all Brands
  • Shop by Industry
  • Locks
  • Electronics
  • Exit Devices
  • Hardware
  • Manufacturer
  • Safes
  • Key Machine

    • Shop by Brand

  • Corbin Russwin
  • Von Duprin
  • Best
  • Schlage
  • Sargent
  • Stanley Hardware
  • Rixson
  • Falcon
  • Yale
  • PHI
  • View all Brands

    • Master Lock

    Master Lock Padlocks and Security Hardware

    In-Stock & Ready to Ship | Expert Technical Support

    Looking for commercial padlocks, combination locks, or key management boxes for a job site? We stock Master Lock ProSeries and standard commercial hardware. Call our team at 877-365-5625 for bulk pricing or help selecting the right shackle clearance and security rating for your application.

    Master Lock makes the padlock you see on every job site, storage unit, and maintenance shed in the country. At Lock Depot we stock the commercial and industrial side of the catalog — the ProSeries solid steel padlocks, resettable combination locks for managed access, and key management boxes for facilities that issue keys to multiple people.

    The retail Master Lock at the hardware store and the commercial ProSeries are different products. The ProSeries uses a solid steel body, double-locking shackle, and heel-and-toe locking for cut and pry resistance that the standard die-cast zinc body does not have. If the application is an exterior chain, a utility meter, or high-turnover storage where someone might try a bolt cutter, specify ProSeries.

    Products

    ProSeries Solid Steel Padlocks

    The 6230 is a solid steel padlock with a 2" wide body and a 1" shackle. Double-locking, heel-and-toe shackle locking, boron carbide shackle, three keys included. For standard overhead door hasps, storage unit bars, or equipment chains where cut resistance matters.

    The 6230LHKD is the same body with a long shackle — the right call when the shackle needs to clear a thick chain link or a hasp with extra depth. Keyed alike option available when one key needs to open multiple locks on a job site.

    Shop Master Lock 6230 ProSeries →

    Shop Master Lock 6230LHKD Long Shackle →

    Resettable Combination Padlocks

    Master Lock's 175 and 176 series are resettable combination padlocks for managed access — storage areas, gym lockers, site tool rooms where you need to change the combination without buying new hardware. The 176 includes a control key and reset tool so a supervisor can override any combination and reset it for a new user without knowing the old combination. This is the model for facilities where turnover is high and sharing a combination is not acceptable.

    On a job site trailer with a rotating crew, the 176's control key reset means you change the combination at crew rollover without issuing a new lock. That's the use case it was designed for.

    Shop Master Lock 175 Combination Padlock →

    Shop Master Lock 176 with Control Key →

    Key Boxes

    The 5401D and 5400D are wall-mounted key storage boxes for facilities that need to issue keys to multiple people from a single secured location. Combination access, holds multiple keys. Used on job sites, rental property management, and commercial facilities where a key must be accessible to authorized staff 24/7 without requiring a key holder to be present.

    Shop Master Lock 5401D Key Box →

    Keying Kits

    The Master Lock 291 Keying Kit includes rekeying parts for Master Lock cylinders — driver pins, key pins, springs, and a follower. For locksmiths and facilities managers who rekey their own Master Lock hardware rather than send it out. Covers the standard Master Lock pin tumbler cylinder format.

    Shop Master Lock 291 Keying Kit →

    Pro Tip: ProSeries vs Standard

    The solid steel ProSeries body is not cosmetically different from the standard die-cast zinc Master Lock — they look similar in a product photo. The difference is in the body material and shackle locking mechanism. If you are buying for an exterior application, a utility enclosure, or anywhere a determined person might try bolt cutters or pry bars, the ProSeries is the one to specify. The standard retail model will not hold up to the same attack. Check the SKU: ProSeries models have the solid steel designation in the title and a corresponding price premium.

    Product Summary

    Product Type Key Feature Best For
    6230ProSeries padlockSolid steel, boron carbide shackleChains, hasps, utility enclosures
    6230LHKDProSeries long shackleLong shackle, keyed alike availableThick chains, deep hasps
    175Combination padlockUser-resettable combinationLockers, storage rooms, light security
    176Combination padlockControl key supervisor overrideJob site trailers, managed crew access
    5401DKey boxWall-mount, combination accessProperty management, 24/7 key access
    291Keying kitPins, springs, followerIn-house cylinder rekeying

    FAQ

    What is the difference between a standard Master Lock and the ProSeries?

    Standard Master Lock padlocks use a die-cast zinc body. The ProSeries uses a solid steel body, a boron carbide shackle for cut resistance, and heel-and-toe double locking so a pry attack on the shackle doesn't pop the lock. The ProSeries is significantly harder to defeat by bolt cutter or pry. It also costs more.

    What does "keyed alike" mean on a padlock order?

    Keyed alike means multiple padlocks are keyed to the same bitting — one key opens all of them. Standard for job site operations where one supervisor key needs to access every locked point. The opposite is keyed different — each padlock has its own unique key.

    How does the 176 control key work?

    The 176 has two access levels: a user combination and a supervisor control key. The control key opens the lock regardless of what combination is set, and it resets the combination. A facility manager can reassign the lock to a new user by resetting the combination with the control key — no locksmith required.

    What shackle diameter does the 6230 use?

    The 6230 uses a 9/32" diameter boron carbide shackle. Boron carbide is significantly harder than hardened steel — bolt cutters that cut through standard shackles will not cut through boron carbide at the same jaw force.

    Need Help Picking the Right Padlock? Talk to a Human.

    Security rating, shackle clearance, keyed alike vs keyed different — the right call depends on the application. Call our hardware desk before you order. No automated phone trees. Call 877-365-5625.

    • Master Lock 94DSPT Resettable Gun Lock Master Lock 94DSPT Resettable Gun Lock
      Quick view

      Master Lock 94DSPT Resettable Gun Lock

        Master Lock 94DSPT Gun Padlock Features: Easy to attach lock trigger access is blocked until lock is removed. Features positive locking with adjustable ratchet mechanism. Offers added convenience of a keyless resettable combination. Special...
      $19.92
      Add to Cart
    • Master Lock 6125 with Keying Option Master Lock 6125 with Keying Option
      Quick view

      Master Lock 6125 with Keying Option

        Master Lock 6125 Weather Tough Padlocks Features: 2-3/8" (61mm) wide laminated steel body for superior strength. Hardened boron alloy shackle for superior cut resistance. High security solid iron shackle shroud resists harsh physical attacks...
      MSRP: $43.15
      $34.52
      Choose Options
    • Master Lock 107DSPT Gun Lock
      Quick view

      Master Lock 107DSPT Gun Lock

        Master Lock 107DSPT Gun Lock   California-approved firearms safety device that meets the requirements of California Penal Code Section 12088 and the regulations issued thereunder.   PLEASE CHECK AVAILABILITY ON KEYED ALIKE...
      MSRP: $17.08
      $14.80
      Add to Cart
    • Master Lock 291 Keying Kit with Parts
      Quick view

      Master Lock 291 Keying Kit with Parts

      Master Lock 291 Re-Keying Kit with Parts Features: Re-Keying kit contains extensive assortment of the most frequently used components. Rugged case with deep storage compartments. Convenient reference chart included. Re-Keying part refills may be...
      MSRP: $107.17
      $100.03
      Add to Cart
    • Master Lock Box 5400D Master Lock Box 5400D
      Quick view

      Master Lock Box 5400D

      Master Lock Box 5400D Features: Large Key Storage compartment holds over 5 house, car or padlock keys. 4 Dial Resettable Combination provides simple, set-your-own combination convenience. Key storage door pivots open smoothly and remains attached to...
      $55.89
      Add to Cart
    • Master Lock 6230 Solid Steel Padlock Master Lock 6230 Solid Steel Padlock
      Quick view

      Master Lock 6230 Solid Steel Padlock

        Master Lock 6230 Solid Steel Padlock Features: 2-1/2" (64mm) wide, hardened solid steel body. Hardened boron alloy shackle for superior cut resistance. 5 spool pin tumbler cylinder for added pick resistance. Removable cylinder can be replaced or...
      MSRP: $42.33
      $33.87
      Add to Cart
    • Master Lock 175LH Master Lock 175LH
      Quick view

      Master Lock 175LH

      Master Lock 175LH Padlock Features: 2" (51mm) wide body. Set-your-own combination convenience. Resettable to any of 10,000 personalized combinations. 2-1/4" shackle. Shackle Dimensions: 5/16" x 2-1/4" x 1".
      MSRP: $28.70
      $27.73
      Add to Cart
    • Master Lock Box 5401D Master Lock Box 5401D
      Quick view

      Master Lock Box 5401D

      Master Lock Box 5401D Features: Large Key Storage compartment holds over 5 house, car or padlock keys. 4 Dial Resettable Combination provides simple, set-your-own combination convenience. Key storage door pivots open smoothly and remains attached...
      $52.43
      Add to Cart
    • Master Lock 230 Re-Keyed Padlock Master Lock 230 Re-Keyed Padlock
      Quick view

      Master Lock 230 Re-Keyed Padlock

      Master Lock 230 Re-Keyed Padlock The Master Lock 230 Solid Body Padlock series features a 2-1/2in wide solid zinc lock body that is strong, durable and resists corrosion. This is ideal for industrial applications, a rekeyable 5-pin W27 cylinder provides...
      MSRP: $38.70
      $30.96
      Add to Cart
    • Master Lock 90DSPT Gun Padlock Master Lock 90DSPT Gun Padlock
      Quick view

      Master Lock 90DSPT Gun Padlock

      Master Lock 90DSPT Gun Padlock Features: The world standard in trigger lock design. Steel and zinc body for maximum durability. Durable metal construction. Protective rubber pads shield gun from scratching or marring. Fits many handguns, rifles and...
      $19.45
      Add to Cart
    • Master Lock 1481DAT Towing Security - Keyed Alike Locksets
      Quick view

      Master Lock 1481DAT Towing Security - Keyed Alike Locksets

      The Master Lock No. 1481DAT Has a 5/8in stainless steel receiver lock with an adjustable coupler latch lock. The receiver lock includes the famous Push to Lock™ locking mechanism, its easily used by pushing the lock body firmly onto the pin and...
      MSRP: $39.58
      $31.67
    Compare Selected