Shop master lock for trailer

Sponsored
About our ads
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
$187.80
Master Lock Universal Trailer Coupler Lock, Fits Most 1-7/8", 2" And 2-5/16" Couplers - 389DAT - Pkg Qty 4
Global Industrial
$187.80
Master Lock Universal Trailer Coupler Lock, Fits Most 1-7/8", 2" And 2-5/16" Couplers - 389DAT - Pkg Qty 4
Global Industrial
$17.41
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$17.41
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$40.65
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
Free shipping
$40.65
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
$33.85
Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", And 2-5/16", 389DAT
Amazon.com
$33.85
Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", And 2-5/16", 389DAT
Amazon.com
$63.19
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
Free shipping
$63.19
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
$12.57
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
$12.57
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
$58.87
Master Lock - 2 Trailer Coupler/Tongue Locks Keyed Alike 2KA-377-3
Amazon.com
Free shipping
$58.87
Master Lock - 2 Trailer Coupler/Tongue Locks Keyed Alike 2KA-377-3
Amazon.com
$29.84
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
$29.84
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
$24.87
Master Lock 605DAT Trailer Coupler Padlock - 2 Pack
Amazon.com
$24.87
Master Lock 605DAT Trailer Coupler Padlock - 2 Pack
Amazon.com
$25.72
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
$25.72
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
$43.77
Master Lock Coupler Lock: Universal, Powder Coated, (2) Keys, Coupler Lock Model: 389DAT
Grainger
$43.77
Master Lock Coupler Lock: Universal, Powder Coated, (2) Keys, Coupler Lock Model: 389DAT
Grainger
$24.76
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
$24.76
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
$14.62
Master Latch Lock - SS Adjustable Trailer Locks 2847
Amazon.com
Free shipping
$14.62
Master Latch Lock - SS Adjustable Trailer Locks 2847
Amazon.com
$50.74
Master Lock 377DAT Trailer Coupler Locks 1St-In-Padlocks
1st-in-Padlocks
$50.74
Master Lock 377DAT Trailer Coupler Locks 1St-In-Padlocks
1st-in-Padlocks
$54.54
Master Lock 3895DAT Coupler Lock And Receiver Lock Coupler Latch, 1 Pack
Amazon.com
Free shipping
$54.54
Master Lock 3895DAT Coupler Lock And Receiver Lock Coupler Latch, 1 Pack
Amazon.com
$106.00
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in.
eBay
$106.00
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in.
eBay
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$41.99
Master Lock Trailer Coupler Lock - Red By Sportsman's Warehouse
Sportsman's Warehouse
$41.99
Master Lock Trailer Coupler Lock - Red By Sportsman's Warehouse
Sportsman's Warehouse
$152.99
MASTER LOCK Lock, Trailer, 387
Zoro.com
$152.99
MASTER LOCK Lock, Trailer, 387
Zoro.com
$67.79
Master Lock 378DAT Trailer Coupler Locks 1St-In-Padlocks
1st-in-Padlocks
$67.79
Master Lock 378DAT Trailer Coupler Locks 1St-In-Padlocks
1st-in-Padlocks
$167.88
Master Lock - 6 Trailer Locks Keyed Alike W/ 12 Keys, 6KA-3796230-3
Amazon.com
Free shipping
$167.88
Master Lock - 6 Trailer Locks Keyed Alike W/ 12 Keys, 6KA-3796230-3
Amazon.com
$61.39
MASTER LOCK Coupler Lock, Universal Trailer Coupler Lock For 1-7/8in. & 2In, 377KA
Zoro.com
$61.39
MASTER LOCK Coupler Lock, Universal Trailer Coupler Lock For 1-7/8in. & 2In, 377KA
Zoro.com
$64.89
Master Lock - (1 Keyed Alike Universal Trailer Coupler Locks
eBay
Free shipping
$64.89
Master Lock - (1 Keyed Alike Universal Trailer Coupler Locks
eBay
$20.39
Master Lock 1479DAT 5/8in (16Mm) Shackle Class III/IV Barbell™ Trailer Receiver Lock
Amazon.com
$20.39
Master Lock 1479DAT 5/8in (16Mm) Shackle Class III/IV Barbell™ Trailer Receiver Lock
Amazon.com
$43.57
Master Lock Trailer Coupler Lock - Universal For All Sizes 379DAT
DkHardware.com
$43.57
Master Lock Trailer Coupler Lock - Universal For All Sizes 379DAT
DkHardware.com
$80.62
Master Lock Trailer Coupler Lock - 2-5/16" Size Silver 378DAT
DkHardware.com
$80.62
Master Lock Trailer Coupler Lock - 2-5/16" Size Silver 378DAT
DkHardware.com
$50.80
Master Lock 379ATPY Trailer Coupler Lock 1St-In-Padlocks, Keyed Alike - All Locks Open With Same Key (Can Only Be Matched To Keys That Start With "0")
1st-in-Padlocks
$50.80
Master Lock 379ATPY Trailer Coupler Lock 1St-In-Padlocks, Keyed Alike - All Locks Open With Same Key (Can Only Be Matched To Keys That Start With "0")
1st-in-Padlocks
$199.70
Master Lock Semi-Trailer Lock For Use With Trailer King Pins 387 - 32948531
Penn Tool Co
$199.70
Master Lock Semi-Trailer Lock For Use With Trailer King Pins 387 - 32948531
Penn Tool Co
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
$50.69
MASTER LOCK Trailer Coupler Lock, 389DAT
Zoro.com
$50.69
MASTER LOCK Trailer Coupler Lock, 389DAT
Zoro.com
$49.59
Master Lock Trailer Coupler Lock Universal 1-7/8-In. 389DAT
DkHardware.com
$49.59
Master Lock Trailer Coupler Lock Universal 1-7/8-In. 389DAT
DkHardware.com
$46.55
Master Lock Universal Trailer Coupler Lock 379KAATPY
etrailer.com
$46.55
Master Lock Universal Trailer Coupler Lock 379KAATPY
etrailer.com
$23.00
Master Lock Solid Brass Latch Lock Trailer Coupler 605Dat 3/4 in 19 mm
eBay
$23.00
Master Lock Solid Brass Latch Lock Trailer Coupler 605Dat 3/4 in 19 mm
eBay
$23.59
Master Lock Chrome Hasp Lock, Heavy Duty Hidden Shackle Lock And Hasp, Solid Steel Lock For Trucks, Trailers, Or Vans, 9 Inches Wide, 770
Amazon.com
$23.59
Master Lock Chrome Hasp Lock, Heavy Duty Hidden Shackle Lock And Hasp, Solid Steel Lock For Trucks, Trailers, Or Vans, 9 Inches Wide, 770
Amazon.com
$94.28
Master Lock Trailer Coupler Lock 1 Pk
Walmart
Free shipping
$94.28
Master Lock Trailer Coupler Lock 1 Pk
Walmart
Master Lock 2-5/16
1:48
etrailer.com
Master Lock 2-5/16
Today we're going to be taking a look at the Master Lock 2 5/16 Inch Trailer Coupler Lock, Part Number 378DAT. This trailer coupler lock guards against trailer tow-away theft. So now we're out here at our trailer and we'll go ahead and show you how to install this. We have the key at the end of the lock and the locking mechanism is pretty ...
Jan 28, 2014
Master Lock Products
Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology
1:14
Master Lock - (4) High Security Pro Series Keyed Alike Padlocks w/8 Keys, 6230NKA-4 w/BumpStop Technology
amazon
Dec 14, 2011
How to Set Your Combination on a Master Lock 175 Padlock
1:36
How to Set Your Combination on a Master Lock 175 Padlock
YouTubepadlockoutet
58.6K viewsFeb 25, 2013
Master Lock 178D: Features & Benefits
0:35
Master Lock 178D: Features & Benefits
YouTubeMaster Lock
2.5K viewsDec 11, 2020
Top videos
A Master Lock I Should FEAR! Model 377 Trailer Lock #masterlock #trailerlock #lockpick #lockpicking #picklock #locks #lockpicker #fyp #padlock | Picking Locks
0:37
A Master Lock I Should FEAR! Model 377 Trailer Lock #masterlock #trailerlock #lockpick #lockpicking #picklock #locks #lockpicker #fyp #padlock | Picking Locks
FacebookPicking Locks
17.2K viewsMar 8, 2024
Master Lock Contractor Grade Single-Hinged Hasp - 6-1/4" Long Master Lock Trailer Door Latch 720DPF
Master Lock Contractor Grade Single-Hinged Hasp - 6-1/4" Long Master Lock Trailer Door Latch 720DPF
etrailer.com
Jun 4, 2020
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome Master Lock Trailer T
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome Master Lock Trailer T
etrailer.com
Feb 13, 2025
Master Lock Reviews
How to Reset a Master Lock
How to Reset a Master Lock
wikiHowTrevor Maclise
218.5K views1 month ago
How to Open a Master Lock Without a Key: 4 Easy Methods!
How to Open a Master Lock Without a Key: 4 Easy Methods!
revolar.com
Feb 1, 2025
Master Lock Silver and Red Receiver Lock, Stainless Steel Barbell™ Hitch Pin Lock, Fits 5/8 in. Receivers, Weather Resistant Automotive Receiver Lock, 1469DAT
0:30
Master Lock Silver and Red Receiver Lock, Stainless Steel Barbell™ Hitch Pin Lock, Fits 5/8 in. Receivers, Weather Resistant Automotive Receiver Lock, 1469DAT
amazon
Aug 17, 2005
A Master Lock I Should FEAR! Model 377 Trailer Lock #masterlock #trailerlock #lockpick #lockpicking #picklock #locks #lockpicker #fyp #padlock | Picking Locks
0:37
A Master Lock I Should FEAR! Model 377 Trailer Lock #masterloc…
17.2K viewsMar 8, 2024
FacebookPicking Locks
Master Lock Contractor Grade Single-Hinged Hasp - 6-1/4" Long Master Lock Trailer Door Latch 720DPF
Master Lock Contractor Grade Single-Hinged Hasp - 6-1/4" Long …
Jun 4, 2020
etrailer.com
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome Master Lock Trailer T
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diamete…
Feb 13, 2025
etrailer.com
A Closer Look at the Master Lock Trailer Coupler Lock
2:21
A Closer Look at the Master Lock Trailer Coupler Lock
8 months ago
etrailer.com
Master Lock Universal Trailer Coupler Lock Master Lock Trailer Tongue Lock 379DAT
Master Lock Universal Trailer Coupler Lock Master Lock Trailer …
May 15, 2024
etrailer.com
Feature Breakdown: Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set
1:55
Feature Breakdown: Master Lock Trailer Hitch Receiver Lock and C…
Sep 17, 2009
etrailer.com
Master Lock Adjustable Trailer Coupler Lock - Stainless Steel Master Lock Trailer Tongue Lock 2847DA
Master Lock Adjustable Trailer Coupler Lock - Stainless Steel Ma…
102 viewsMay 15, 2024
etrailer.com
0:45
Master Lock Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. …
36 viewsOct 3, 2008
amazon
Top 5 Best & Most Secure Trailer Hitch Locks • (2026 Reviews)
Aug 2, 2020
antitheftboss.com
0:30
Master Lock Silver and Red Receiver Lock, Stainless Steel Bar…
Aug 17, 2005
amazon
0:25
Master Lock Silver Trailer Hitch Lock, Trailer Tongue Lock for RV, …
Jan 1, 2024
amazon
2:22
Release Me - Install
92.5K viewsJul 17, 2015
YouTubeRandi Arnold
7:32
Lost Keys! Hitch Lock Replacement
23K viewsJul 1, 2020
YouTubeRV Site 2 Sight
5:04
Master Lock #21 Padlock Rekeying How To Re-Key
39K viewsNov 17, 2014
YouTubeWayne Winton
5:22
BOLT Off Vehicle Coupler Lock Attack Video
30.8K viewsOct 1, 2019
YouTubeBOLT Lock
1:03
Trailer Coupling Locks // Supercheap Auto
67.3K viewsDec 14, 2015
YouTubeSupercheap Auto
14:18
DIY Travel Trailer Lock - How To Make
318.6K viewsApr 11, 2019
YouTubehomesteadonomics
8:01
BAL Lock-Arm Stabilizing Bar Installation
51K viewsAug 7, 2018
YouTubeGarrett Scott
2:42
BREAK the Lock
406.3K viewsSep 13, 2013
YouTubeBOLT Lock
11:17
[626] A Pick Proof Master Lock? ALMOST!
2.9M viewsFeb 24, 2018
YouTubeLockPickingLawyer
3:14
[845] Master Locks With INEXCUSABLE Design Flaws
6.2M viewsMar 2, 2019
YouTubeLockPickingLawyer
4:29
Coupler Locks to Secure Your Trailer
53.7K viewsJun 4, 2021
YouTubeU-Haul Trailer Hitches And Towing
11:19
Master Lock 2953AT 12-Volt DC Portable Winch
515.8K viewsMar 23, 2013
YouTubeRedneckComputerGeek
1:46
U-Haul Stainless Coupler Lock: Review and Demo
10.3K viewsJun 4, 2021
YouTubeU-Haul Trailer Hitches And Towing
7:26
(1532) Master Lock Trailer Couplers (379ATPY & 389DAT) (JUNK!)
107.4K viewsJul 17, 2019
YouTubeBill Johnson
1:02
Master Lock® Lost Keys and Key Replacements
71.1K viewsSep 21, 2016
YouTubeThe Lock People®
4:57
Best Trailer Lock Comparison (Head to Head)
84.7K viewsNov 7, 2019
YouTubeThrifty Garage
20:41
The Best Trailer Lock Just Got Better!
54.6K viewsDec 9, 2019
YouTubeRough Rider's Adventures
13:12
The Best Trailer Lock you can get!
96K viewsSep 11, 2020
YouTubeTools In Action
See more videos
Static thumbnail place holder

Shop master lock for trailer

Sponsored
About our ads
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
$187.80
Master Lock Universal Trailer Coupler Lock, Fits Most 1-7/8", 2" And 2-5/16" Couplers - 389DAT - Pkg Qty 4
Global Industrial
$187.80
Master Lock Universal Trailer Coupler Lock, Fits Most 1-7/8", 2" And 2-5/16" Couplers - 389DAT - Pkg Qty 4
Global Industrial
$17.41
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$17.41
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$40.65
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
Free shipping
$40.65
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
$33.85
Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", And 2-5/16", 389DAT
Amazon.com
$33.85
Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", And 2-5/16", 389DAT
Amazon.com
$63.19
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
Free shipping
$63.19
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
$12.57
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
$12.57
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT
Amazon.com
$58.87
Master Lock - 2 Trailer Coupler/Tongue Locks Keyed Alike 2KA-377-3
Amazon.com
Free shipping
$58.87
Master Lock - 2 Trailer Coupler/Tongue Locks Keyed Alike 2KA-377-3
Amazon.com
$29.84
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
$29.84
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
$24.87
Master Lock 605DAT Trailer Coupler Padlock - 2 Pack
Amazon.com
$24.87
Master Lock 605DAT Trailer Coupler Padlock - 2 Pack
Amazon.com
$25.72
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
$25.72
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
$43.77
Master Lock Coupler Lock: Universal, Powder Coated, (2) Keys, Coupler Lock Model: 389DAT
Grainger
$43.77
Master Lock Coupler Lock: Universal, Powder Coated, (2) Keys, Coupler Lock Model: 389DAT
Grainger
$24.76
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
$24.76
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
$14.62
Master Latch Lock - SS Adjustable Trailer Locks 2847
Amazon.com
Free shipping
$14.62
Master Latch Lock - SS Adjustable Trailer Locks 2847
Amazon.com
$50.74
Master Lock 377DAT Trailer Coupler Locks 1St-In-Padlocks
1st-in-Padlocks
$50.74
Master Lock 377DAT Trailer Coupler Locks 1St-In-Padlocks
1st-in-Padlocks
$54.54
Master Lock 3895DAT Coupler Lock And Receiver Lock Coupler Latch, 1 Pack
Amazon.com
Free shipping
$54.54
Master Lock 3895DAT Coupler Lock And Receiver Lock Coupler Latch, 1 Pack
Amazon.com
$106.00
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in.
eBay
$106.00
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in.
eBay
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine
$34.99
Master Lock Lock And Adjustable Coupler Latch Lock Package | For Trailers | By West Marine
WestMarine