Shop master lock for trailer

Sponsored
About our ads
$13.00
Circuit Breaker Lockout - Standard - Master Lock
Uline
$13.00
Circuit Breaker Lockout - Standard - Master Lock
Uline
$38.00
Adjustable Cable Lockout - 6' - Master Lock
Uline
$38.00
Adjustable Cable Lockout - 6' - Master Lock
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Red - Master Lock - Pack Of 2
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Red - Master Lock - Pack Of 2
Uline
$40.42
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
5K+
Free shipping
$40.42
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
$16.26
$17.21
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
1K+
$16.26
$17.21
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$59.39
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
915
Free shipping
$59.39
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
4K+
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
$33.07
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
1K+
$33.07
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
$28.57
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
656
$28.57
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
$15.29
OTR Trailer Gladhand Lock | Otr Gladhand Lock Random Key | OTR50030
FleetPride
$15.29
OTR Trailer Gladhand Lock | Otr Gladhand Lock Random Key | OTR50030
FleetPride
$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
17K+
$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
$42.68
$55.48
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT 377KA Trailer Hitch Lock, Fits 1-7/8 In, 2 In, And Most 2-5/16 in. Trailer Couplers
Suthisa.us
Free shipping
23% off
$42.68
$55.48
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT 377KA Trailer Hitch Lock, Fits 1-7/8 In, 2 In, And Most 2-5/16 in. Trailer Couplers
Suthisa.us
$9.49
$31.95
Master Lock 379ATPY Universal Trailer Hitch Lock, Black - Radiant Selections
tk.nenemedia.com
70% off
$9.49
$31.95
Master Lock 379ATPY Universal Trailer Hitch Lock, Black - Radiant Selections
tk.nenemedia.com
$13.20
Master Lock Lockout Padlock: Keyed Different, Laminated Steel, 2.0000" High, Steel Shackle, Black - 9/32" Shackle Dia, 1-1/4" Body Height
MSC Direct
$13.20
Master Lock Lockout Padlock: Keyed Different, Laminated Steel, 2.0000" High, Steel Shackle, Black - 9/32" Shackle Dia, 1-1/4" Body Height
MSC Direct
$19.99
Master Lock 9/16in. To 2 3/4in. Long Adjustable Stainless Steel Trailer Coupler Latch Lock, Model 2847DAT
Northern Tool
1
$19.99
Master Lock 9/16in. To 2 3/4in. Long Adjustable Stainless Steel Trailer Coupler Latch Lock, Model 2847DAT
Northern Tool
$13.99
Master Lock Adjustable Stainless Steel Trailer Coupler Latch Lock
Sportsman's Warehouse
1
$13.99
Master Lock Adjustable Stainless Steel Trailer Coupler Latch Lock
Sportsman's Warehouse
$34.99
Master Lock Universal Trailer Coupler Lock, Model 389DAT
Northern Tool
17K+
$34.99
Master Lock Universal Trailer Coupler Lock, Model 389DAT
Northern Tool
$61.99
Master Lock Trailer Lock Set Coupler, Receiver And Coupler Latch, Keyed Alike
delupe.com
Free shipping
$61.99
Master Lock Trailer Lock Set Coupler, Receiver And Coupler Latch, Keyed Alike
delupe.com
$36.99
Master Lock Proseries 2-7/8 Inch Hidden Shackle Keyed Alike Padlock - 6271KA
Acme Tools
2K+
$36.99
Master Lock Proseries 2-7/8 Inch Hidden Shackle Keyed Alike Padlock - 6271KA
Acme Tools
$24.76
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
1K+
$24.76
Master Lock Trailer Coupler Latch Lock - 3-1/2" Span - 9/32" Diameter - Chrome ML94VR
etrailer.com
$33.66
Master Lock Trailer Coupler Lock - 1-7/8", 2" And 2-5/16" Ball Couplers ML389DAT
etrailer.com
17K+
$33.66
Master Lock Trailer Coupler Lock - 1-7/8", 2" And 2-5/16" Ball Couplers ML389DAT
etrailer.com
$47.40
$79.00
Master Lock - 3 Trailer Locks Keyed Alike 3KA-379-37(3KA-377-37)
shamanicifs
39% off
$47.40
$79.00
Master Lock - 3 Trailer Locks Keyed Alike 3KA-379-37(3KA-377-37)
shamanicifs
$46.80
$78.00
Master Lock - (2 Keyed Alike Universal Trailer Coupler Locks 379KA-2(1 Pack)
shamanicifs
40% off
$46.80
$78.00
Master Lock - (2 Keyed Alike Universal Trailer Coupler Locks 379KA-2(1 Pack)
shamanicifs
$7.99
Master Lock Trailer Coupler Latch Lock Adjustable Stainless Steel, Keyed Different, 6 Ing Positions From 9/16" (14Mm) To 2-3/4" (70Mm)
delupe.com
Free shipping
$7.99
Master Lock Trailer Coupler Latch Lock Adjustable Stainless Steel, Keyed Different, 6 Ing Positions From 9/16" (14Mm) To 2-3/4" (70Mm)
delupe.com
$48.48
$64.72
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT Pack Of 2
TekCypher.com
25% off
$48.48
$64.72
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT Pack Of 2
TekCypher.com
$41.99
Master Lock Trailer Coupler Lock - Red
Sportsman's Warehouse
17K+
$41.99
Master Lock Trailer Coupler Lock - Red
Sportsman's Warehouse
$42.90
$57.19
Master Lock 3895DAT - Coupler Lock, Receiver Lock And Latch Lock - 3 Components Keyed Alike Pack Of 2
TekCypher.com
24% off
$42.90
$57.19
Master Lock 3895DAT - Coupler Lock, Receiver Lock And Latch Lock - 3 Components Keyed Alike Pack Of 2
TekCypher.com
$105.27
$111.23
Master Lock 3794DAT | Combination Trailer Lock Kit, Keyed Alike With Trailer Coupler/Receiver/Coupler Latch
AllDataResource.com
9
$105.27
$111.23
Master Lock 3794DAT | Combination Trailer Lock Kit, Keyed Alike With Trailer Coupler/Receiver/Coupler Latch
AllDataResource.com
$45.76
$61.05
Master Lock Trailer Lock, Stainless Steel Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 3784DAT Pack Of 2
TekCypher.com
25% off
$45.76
$61.05
Master Lock Trailer Lock, Stainless Steel Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 3784DAT Pack Of 2
TekCypher.com
$45.99
Marshall Master Lock Trailer Coupler Lock | Camping World
Camping World
17K+
$45.99
Marshall Master Lock Trailer Coupler Lock | Camping World
Camping World
$14.99
Master Lock Trailer Coupler Latch Lock 3-1/2in (89Mm) Long
delupe.com
Free shipping
$14.99
Master Lock Trailer Coupler Latch Lock 3-1/2in (89Mm) Long
delupe.com
$108.81
$114.95
Master Lock 3784DAT | Trailer Coupler Lock, Keyed Alike, Heavy Duty, 2-5/16", Laminated Steel
AllDataResource.com
11
$108.81
$114.95
Master Lock 3784DAT | Trailer Coupler Lock, Keyed Alike, Heavy Duty, 2-5/16", Laminated Steel
AllDataResource.com
$63.95
Master Lock Universal Coupler Lock, Rekeyable Cylinder, Fits 1-7/8", 2" & 2-5/16", 379ATPY
Global Industrial
5K+
$63.95
Master Lock Universal Coupler Lock, Rekeyable Cylinder, Fits 1-7/8", 2" & 2-5/16", 379ATPY
Global Industrial
$42.76
Master Lock 1175DLH, 2-1/4in (57Mm) Wide Proseries Brass Resettable Combination Padlock
Selectum
$42.76
Master Lock 1175DLH, 2-1/4in (57Mm) Wide Proseries Brass Resettable Combination Padlock
Selectum
$141.56
Master Lock 377DAT | Trailer Coupler Lock, Keyed Different
AllDataResource.com
1K+
$141.56
Master Lock 377DAT | Trailer Coupler Lock, Keyed Different
AllDataResource.com
$133.50
Master Lock 5KA-A549, No. 5 Laminated Steel Padlock, 3/8 in Dia X 15/16 in W X 1 in H Shackle, Silve
Selectum
$133.50
Master Lock 5KA-A549, No. 5 Laminated Steel Padlock, 3/8 in Dia X 15/16 in W X 1 in H Shackle, Silve
Selectum
Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers Master Lock Trailer Tongue Lock 60
Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers M…
May 15, 2024
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
Master Lock Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Weather Resistant Automotive Hitch Lock with Keys, 377KA
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)
Top 5 Best & Most Secure Trailer Hitch Locks • (2026 Reviews)
Aug 2, 2020
antitheftboss.com
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 Bar…
Aug 17, 2005
amazon
Master Lock Silver Trailer Hitch Lock, Trailer Tongue Lock for RV, Horse Trailer, or Utility Tool Trailer, 377DAT
0:25
Master Lock Silver Trailer Hitch Lock, Trailer Tongue Lock for RV, …
Jan 1, 2024
amazon
RV Master- Upgraded RV Door Lock Replacement with Fingerprint, Password, Keys, RV Keyless Entry for Trailer Door and Camper Door Lock, Trailer Entry Door Latch Replacement(NOT Fits Class A/C)
2:41
RV Master- Upgraded RV Door Lock Replacement with Fingerprint, Pas…
3 viewsAug 15, 2023
amazon
7:13
Top 5 Best Trailer Hitch Locks in 2025 | Reviews, Prices & Where to …
4.3K viewsNov 23, 2023
YouTubeSecure Gear
0:39
AMP Lock | How to install your trailer & boat trailer lock
10.4K viewsAug 23, 2018
YouTubeAmplock trailerlock - The Security Master
etrailer | Checking Out the Master Lock Hidden Padlock
9.2K viewsJul 15, 2019
YouTubeetrailer
[1356] A Master Lock I Should FEAR?!? Model 377 Trailer Lock
1.3M viewsSep 8, 2021
YouTubeLockPickingLawyer
2:22
Release Me - Install
92.4K viewsJul 17, 2015
YouTubeRandi Arnold
7:32
Lost Keys! Hitch Lock Replacement
22K viewsJul 1, 2020
YouTubeRV Site 2 Sight
5:04
Master Lock #21 Padlock Rekeying How To Re-Key
38.6K viewsNov 17, 2014
YouTubeWayne Winton
1:03
Trailer Coupling Locks // Supercheap Auto
65.7K viewsDec 14, 2015
YouTubeSupercheap Auto
14:18
DIY Travel Trailer Lock - How To Make
316.1K viewsApr 11, 2019
YouTubehomesteadonomics
8:01
BAL Lock-Arm Stabilizing Bar Installation
50.9K viewsAug 7, 2018
YouTubeGarrett Scott
2:42
BREAK the Lock
405.5K 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
50.9K viewsJun 4, 2021
YouTubeU-Haul Trailer Hitches And Towing
11:19
Master Lock 2953AT 12-Volt DC Portable Winch
512K viewsMar 23, 2013
YouTubeRedneckComputerGeek
1:46
U-Haul Stainless Coupler Lock: Review and Demo
9.6K viewsJun 4, 2021
YouTubeU-Haul Trailer Hitches And Towing
4:26
[660] Ramset vs. Reese Trailer Coupler Lock
1.4M viewsApr 13, 2018
YouTubeLockPickingLawyer
7:26
(1532) Master Lock Trailer Couplers (379ATPY & 389DAT) (JUNK!)
106.3K viewsJul 17, 2019
YouTubeBill Johnson
8:30
Proven Industries Hitch Lock - Update Video
17.3K viewsJun 16, 2019
YouTubeRough Rider's Adventures
1:02
Master Lock® Lost Keys and Key Replacements
69.5K viewsSep 21, 2016
YouTubeThe Lock People®
20:41
The Best Trailer Lock Just Got Better!
54.1K viewsDec 9, 2019
YouTubeRough Rider's Adventures
21:23
Harbor Freight Hitch Pin Locks Review & Evaluation
11.5K viewsOct 21, 2018
YouTubeCatus Maximus
13:12
The Best Trailer Lock you can get!
95.3K viewsSep 11, 2020
YouTubeTools In Action
See more videos
Static thumbnail place holder

Shop master lock for trailer

Sponsored
About our ads
$13.00
Circuit Breaker Lockout - Standard - Master Lock
Uline
$13.00
Circuit Breaker Lockout - Standard - Master Lock
Uline
$38.00
Adjustable Cable Lockout - 6' - Master Lock
Uline
$38.00
Adjustable Cable Lockout - 6' - Master Lock
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Red - Master Lock - Pack Of 2
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Red - Master Lock - Pack Of 2
Uline
$40.42
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
5K+
Free shipping
$40.42
Master Lock Black Universal Size Trailer Hitch Lock, Trailer Coupler Lock For Securing Rvs, Horse Trailers, Tool Trailers And More, 379ATPY
Amazon.com
$16.26
$17.21
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
1K+
$16.26
$17.21
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$59.39
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
915
Free shipping
$59.39
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
Amazon.com
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
4K+
$66.95
Master Lock Trailer Coupler Lock, 2-5/16" - 378DAT
Global Industrial
$33.07
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
1K+
$33.07
Master Lock Receiver/Coupler Lock: Silver, (2) Keys, Trailer Locking Kit Model: 2848DAT
Grainger
$28.57
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
656
$28.57
Master Lock Trailer Receiver Lock: Barbell, Silver, (2) Keys, Receiver Lock Model: 1479DAT
Grainger
$15.29
OTR Trailer Gladhand Lock | Otr Gladhand Lock Random Key | OTR50030
FleetPride
$15.29
OTR Trailer Gladhand Lock | Otr Gladhand Lock Random Key | OTR50030
FleetPride
$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
17K+
$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
$42.68
$55.48
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT 377KA Trailer Hitch Lock, Fits 1-7/8 In, 2 In, And Most 2-5/16 in. Trailer Couplers
Suthisa.us
Free shipping
23% off
$42.68
$55.48
Master Lock Trailer Lock, Trailer Coupler Lock, Fits 2-5/16 in. Couplers, 378DAT 377KA Trailer Hitch Lock, Fits 1-7/8 In, 2 In, And Most 2-5/16 in. Trailer Couplers
Suthisa.us
$9.49
$31.95
Master Lock 379ATPY Universal Trailer Hitch Lock, Black - Radiant Selections
tk.nenemedia.com
70% off
$9.49
$31.95
Master Lock 379ATPY Universal Trailer Hitch Lock, Black - Radiant Selections
tk.nenemedia.com
$13.20
Master Lock Lockout Padlock: Keyed Different, Laminated Steel, 2.0000" High, Steel Shackle, Black - 9/32" Shackle Dia, 1-1/4" Body Height
MSC Direct
$13.20
Master Lock Lockout Padlock: Keyed Different, Laminated Steel, 2.0000" High, Steel Shackle, Black - 9/32" Shackle Dia, 1-1/4" Body Height
MSC Direct
$19.99
Master Lock 9/16in. To 2 3/4in. Long Adjustable Stainless Steel Trailer Coupler Latch Lock, Model 2847DAT
Northern Tool
1
$19.99
Master Lock 9/16in. To 2 3/4in. Long Adjustable Stainless Steel Trailer Coupler Latch Lock, Model 2847DAT
Northern Tool
$13.99
Master Lock Adjustable Stainless Steel Trailer Coupler Latch Lock
Sportsman's Warehouse
1
$13.99
Master Lock Adjustable Stainless Steel Trailer Coupler Latch Lock
Sportsman's Warehouse
$34.99
Master Lock Universal Trailer Coupler Lock, Model 389DAT
Northern Tool
17K+
$34.99
Master Lock Universal Trailer Coupler Lock, Model 389DAT
Northern Tool
$61.99
Master Lock Trailer Lock Set Coupler, Receiver And Coupler Latch, Keyed Alike
delupe.com
Free shipping
$61.99
Master Lock Trailer Lock Set Coupler, Receiver And Coupler Latch, Keyed Alike
delupe.com