Shop Master Coupler Locks for Trailers

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$44.00
Aluminum Lockout Padlock - Keyed Different, Red - Master Lock - Qty Of 2
Uline
$44.00
Aluminum Lockout Padlock - Keyed Different, Red - Master Lock - Qty Of 2
Uline
$126.00
Master Lock Lockout Padlock - Set Of 6 Keyed Alike, 1 1/2" Shackle, Black - Master Lock - Pack Of 6
Uline
$126.00
Master Lock Lockout Padlock - Set Of 6 Keyed Alike, 1 1/2" Shackle, Black - Master Lock - Pack Of 6
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Green - Master Lock - Pack Of 2
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Green - Master Lock - Pack Of 2
Uline
$42.85
Master Lock Coupler Lock: Universal, 1 7/8 In/2 5/16 In/2 In, Powder Coated, (2) Keys Model: 389DAT
Grainger
17K+
$42.85
Master Lock Coupler Lock: Universal, 1 7/8 In/2 5/16 In/2 In, Powder Coated, (2) Keys Model: 389DAT
Grainger
$86.00
Master Lock Barbell Receiver Lock, 5/8" - Pkg Qty 4, 1479DAT
Global Industrial
680
$86.00
Master Lock Barbell Receiver Lock, 5/8" - Pkg Qty 4, 1479DAT
Global Industrial
$17.21
$19.87
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
1K+
13% off
$17.21
$19.87
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$119.68
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 4 Pack
Amazon.com
15K+
Free shipping
$119.68
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 4 Pack
Amazon.com
$33.07
Master Lock Receiver/Coupler Lock: 1/2 In/5/8 In, (2) Keys Model: 2848DAT
Grainger
1K+
$33.07
Master Lock Receiver/Coupler Lock: 1/2 In/5/8 In, (2) Keys Model: 2848DAT
Grainger
$85.48
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
17K+
Free shipping
$85.48
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
$81.46
Master Lock Coupler Lock: 1/2 In/5/8 in Model: 3794DAT
Grainger
$81.46
Master Lock Coupler Lock: 1/2 In/5/8 in Model: 3794DAT
Grainger
$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
$191.80
Master Lock Coupler Lock, 3/4" Shackle, Solid Brass - Pkg Qty 4, 605DAT
Global Industrial
1K+
$191.80
Master Lock Coupler Lock, 3/4" Shackle, Solid Brass - Pkg Qty 4, 605DAT
Global Industrial
$32.39
MASTER LOCK Coupler Lock, Universal, 389DAT
Zoro.com
10
$32.39
MASTER LOCK Coupler Lock, Universal, 389DAT
Zoro.com
$44.56
Master Lock 1-7/8", 2", And 2-5/16" Trailer Coupler Lock - Gray - Keyed Alike ML377KA
etrailer.com
$44.56
Master Lock 1-7/8", 2", And 2-5/16" Trailer Coupler Lock - Gray - Keyed Alike ML377KA
etrailer.com
$54.49
Master Lock Set - Coupler Ball Lock, Locking Hitch Pin, And Coupler Latch Lock ML44VR
etrailer.com
1K+
$54.49
Master Lock Set - Coupler Ball Lock, Locking Hitch Pin, And Coupler Latch Lock ML44VR
etrailer.com
$75.20
Master Lock Receiver And Coupler Lock Kit, Model 3895Dat
Walmart
10
Free shipping
$75.20
Master Lock Receiver And Coupler Lock Kit, Model 3895Dat
Walmart
$32.74
Master Lock Universal Trailer Coupler Lock 379DAT
etrailer.com
404
$32.74
Master Lock Universal Trailer Coupler Lock 379DAT
etrailer.com
$62.99
Master Lock Towing Security Lock Kit | For Trailers | By West Marine
WestMarine
9
$62.99
Master Lock Towing Security Lock Kit | For Trailers | By West Marine
WestMarine
$46.99
Marshall Master Lock Trailer Coupler Lock | Overton's
Overton's
17K+
$46.99
Marshall Master Lock Trailer Coupler Lock | Overton's
Overton's
$60.95
Master Lock Gray Zinc Die Cast Coupler Lock
Airgas
1K+
$60.95
Master Lock Gray Zinc Die Cast Coupler Lock
Airgas
$64.29
MASTER LOCK Coupler Lock, Stainless Steel, 3794DAT
Zoro.com
2
$64.29
MASTER LOCK Coupler Lock, Stainless Steel, 3794DAT
Zoro.com
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
1
$17.99
Master Lock Adjustable Coupler Latch Lock | For Trailers | By West Marine
WestMarine
$12.39
MASTER LOCK Towing Coupler Latch Lock, SS, 2847DATSC
Zoro.com
2
$12.39
MASTER LOCK Towing Coupler Latch Lock, SS, 2847DATSC
Zoro.com
$23.49
Master Lock 1471DAT Master Locka® Barbella„¢ Long Shackle Coupler Lock For Ufp Couplers, 3 1/2"
FinditParts
1K+
$23.49
Master Lock 1471DAT Master Locka® Barbella„¢ Long Shackle Coupler Lock For Ufp Couplers, 3 1/2"
FinditParts
$19.99
Keyed Alike Heavy-Duty Trailer Coupler Lock W/ Keys - Fit 1-7/8", 2" & 2-5/16"
MyteeProducts
$19.99
Keyed Alike Heavy-Duty Trailer Coupler Lock W/ Keys - Fit 1-7/8", 2" & 2-5/16"
MyteeProducts
$25.42
Master Lock 2847Dat Adjustable Stainless Steel Trailer Coupler Latch Lock 9/16 in. To 2-3/4 in. Long
Walmart
1
Free shipping
$25.42
Master Lock 2847Dat Adjustable Stainless Steel Trailer Coupler Latch Lock 9/16 in. To 2-3/4 in. Long
Walmart
$46.99
Marshall Master Lock Trailer Coupler Lock | Camping World
Camping World
17K+
$46.99
Marshall Master Lock Trailer Coupler Lock | Camping World
Camping World
$46.11
Master Lock Trailer Coupler Lock Universal 1-7/8-In. 389DAT
DkHardware.com
17K+
$46.11
Master Lock Trailer Coupler Lock Universal 1-7/8-In. 389DAT
DkHardware.com
$79.49
4Pk Keyed Alike Heavy Duty Trailer Coupler Lock - Fit 1-7/8", 2" & 2-5/16"
MyteeProducts
5
$79.49
4Pk Keyed Alike Heavy Duty Trailer Coupler Lock - Fit 1-7/8", 2" & 2-5/16"
MyteeProducts
$31.47
Master Lock 389DAT Universal Trailer Coupler Lock, Red
Mr. Lock
17K+
$31.47
Master Lock 389DAT Universal Trailer Coupler Lock, Red
Mr. Lock
$31.99
Master Lock Keyed Alike Receiver & Coupler Latch Lock Set - Locks At 2" - 1" And 5/8" Coupler Latch Openings, 2848DAT
Advance Auto Parts
1K+
$31.99
Master Lock Keyed Alike Receiver & Coupler Latch Lock Set - Locks At 2" - 1" And 5/8" Coupler Latch Openings, 2848DAT
Advance Auto Parts
$19.00
Master Lock 1/2 in And 5/8 in Swivel Head Receiver Lock W/Ss Adj Coupler Latch Lock Stainless Steel | 2848DAT
Lowe's
6
$19.00
Master Lock 1/2 in And 5/8 in Swivel Head Receiver Lock W/Ss Adj Coupler Latch Lock Stainless Steel | 2848DAT
Lowe's
$15.99
Master Lock Solid Brass Coupler Latch Trailer Lock, With 3/4in. Shackle, Model 605DAT
Northern Tool
1K+
$15.99
Master Lock Solid Brass Coupler Latch Trailer Lock, With 3/4in. Shackle, Model 605DAT
Northern Tool
$56.87
Master Lock 377Ka Universal Coupler Lock
Walmart
14
Free shipping
$56.87
Master Lock 377Ka Universal Coupler Lock
Walmart
$12.00
Master Lock 605DAT Solid Brass Trailer Coupler Latch Keyed Lock 3/4in W/ 2 Keys. Master Lock. Other Towing Parts. 071649015137.
eBay
14
$12.00
Master Lock 605DAT Solid Brass Trailer Coupler Latch Keyed Lock 3/4in W/ 2 Keys. Master Lock. Other Towing Parts. 071649015137.
eBay
$18.59
Master Lock 9/16" X 2-3/4" Adustable Stainless Steel Trailer Coupler Lock
White Cap
$18.59
Master Lock 9/16" X 2-3/4" Adustable Stainless Steel Trailer Coupler Lock
White Cap
2.5K views · 24 reactions | Demco’s unique EZ latch design automatically latches when placed over a hitch ball, and are entirely maintenance-free as their couplers don't require any greasing or adjustments.  We offer Demco coupler upgrades on almost all of our models.  #DoWork #WorkHardPlayHard #WorkSmarterNotHarder #DCtrailers | Diamond C Trailers | Facebook
0:06
2.5K views · 24 reactions | Demco’s unique EZ latch design automatic…
2.6K views2 weeks ago
FacebookDiamond C Trailers
7.3K views · 22 reactions | Protect your investment with Interstate’s Trailer Defender™ High-Security Coupler Lock! The Trailer Defender™ is one of the most heavy-duty, dependable, and theft-proof coupler locks on the market. Backed by our $500 Guarantee, if your trailer is stolen by defeating our High-Security Coupler Lock, just show us the broken lock and we will give you a $500 credit toward the purchase of a replacement trailer from us! | TrailersPlus | Facebook
1:18
7.3K views · 22 reactions | Protect your investment with Interstate’s …
2K views1 week ago
FacebookTrailersPlus
36 reactions · 9 comments | Make towing easy! The BOLT Coupler Pin Lock is an easy and convenient solution to locking up your trailers and boats. Plus you only have to use one key- your ignition key!  | BOLT Lock | Facebook
0:59
36 reactions · 9 comments | Make towing easy! The BOLT Coupler Pi…
279K views2 weeks ago
FacebookBOLT Lock
2.1K views | Masterclass #11 - Adjusting Compression Locks and Seal Pressure Maintenance MDC MASTERCLASS is a Series of Short Informational Videos, How To's, Tips and Tricks for using MDC Camper Trailers and Offroad Hybrid Caravans. GOTO OUR WEBSITE TO KEEP UP TO DATE WITH THE LATEST CAMPING HACKS, TIPS, TRICKS & PRODUCT UPDATES!!! https://www.marketdirect.com.au/mdc-masterclass-video-hints-and-tips/ | MDC Caravans and Campers | Facebook
1:35
2.1K views | Masterclass #11 - Adjusting Compression Locks an…
2.1K views2 weeks ago
FacebookMDC Caravans and Campers
ICON Trailer Coupler Lock
ICON Trailer Coupler Lock
385 viewsOct 11, 2023
altorlocks.com
World’s Toughest Trailer Lock Now Fits Virtually Every Coupler
World’s Toughest Trailer Lock Now Fits Virtually Every Coupler
Oct 11, 2023
autoguide.com
BOLT Trailer Coupler Lock - 1-7/8", 2", and 2-5/16" Couplers - For Chrysler Key Bolt BOLT Locks BL70
BOLT Trailer Coupler Lock - 1-7/8", 2", and 2-5/16" Couplers - For Chr…
311 viewsFeb 11, 2021
etrailer.com
ICON Trailer Coupler Lock for Cast 2-5/16" Ball Coupler - Cast and St…
2 viewsJun 24, 2024
etrailer.com
Trimax Right Angle Adjustable Trailer Coupler Latch Lock - 7/8" t…
1 views11 months ago
etrailer.com
ICON Trailer Coupler Lock for Cast 2-5/16" Ball Coupler - Cast and St…
1 viewsJun 24, 2024
etrailer.com
Trimax Trailer Coupler Latch Lock - 1/4" Pin Diameter - 2-1/2" Span Tri…
2 views11 months ago
etrailer.com
Master Lock Trigger Style Coupler Lock for 1-7/8" and 2" Couplers M…
May 15, 2024
etrailer.com
Master Lock Universal Trailer Coupler Lock Master Lock Trailer …
46 viewsMay 15, 2024
etrailer.com
0:30
Master Lock Universal Trailer Hitch Lock - Walmart.com
146 views5 months ago
Walmart.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
0:40
Master Lock 378DAT Trailer Coupler Lock, 2-5/16-Inch
1 viewsSep 14, 2004
amazon
7:15
BoltLock Lock System! Uses Your Vehicle Key For All Locks!
236 views3 months ago
YouTubeMyks Garage
2:28
Heavy Duty Trailer Security With Master Lock 378DAT Coupler Lock
3 weeks ago
YouTubeDVM NEWS
2:22
etrailer | A Closer Look at the Master Lock Trailer Coupler Lock
15 views3 months ago
YouTubeetrailer.com
Sleep better…get a Proven Industries Lock for your trailer!🇺🇸 W…
4.5K viewsJun 1, 2023
TikTokprovenindustriesofficial
Best Coupler Locks | Proven Industries Trailer Locks
46.6K viewsFeb 28, 2023
TikTokprovenindustriesofficial
etrailer | Ultimate Overview of the Blaylock EZ Lock Gooseneck Cou…
584 viewsAug 18, 2021
YouTubeetrailer.com
etrailer | Review of TowSmart Trailer Tongue Lock - Surround Lock - TS…
43 viewsDec 6, 2024
YouTubeetrailer.com
Top 5 Best Trailer Hitch Locks in 2025 | Reviews, Prices & Where to …
4.2K viewsNov 23, 2023
YouTubeSecure Gear
etrailer | What to Know About the AMPLock Trailer Coupler Lock for …
828 viewsDec 3, 2021
YouTubeetrailer.com
Best Trailer Hitch Locks 🔐: 2020 Ultimate Picks | RV Expertise
15.4K viewsDec 10, 2020
YouTubeRV Expertise
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty …
32 viewsAug 27, 2024
YouTubeWizard Review
Pack Pliers - Master Link Combo Pliers
Jan 23, 2018
wolftoothcomponents.com
DIY Coupler Lock: Affordable and Effective Trailer Security
518 viewsDec 5, 2024
YouTubeImpervium Productions
Secure Your Trailer with Rhino Coupler Lock
2.4K views10 months ago
TikTokoletc
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Shop Master Coupler Locks for Trailers

Sponsored
About our ads
$44.00
Aluminum Lockout Padlock - Keyed Different, Red - Master Lock - Qty Of 2
Uline
$44.00
Aluminum Lockout Padlock - Keyed Different, Red - Master Lock - Qty Of 2
Uline
$126.00
Master Lock Lockout Padlock - Set Of 6 Keyed Alike, 1 1/2" Shackle, Black - Master Lock - Pack Of 6
Uline
$126.00
Master Lock Lockout Padlock - Set Of 6 Keyed Alike, 1 1/2" Shackle, Black - Master Lock - Pack Of 6
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Green - Master Lock - Pack Of 2
Uline
$38.00
Master Lock Lockout Padlock - Keyed Different, 1 1/2" Shackle, Green - Master Lock - Pack Of 2
Uline
$42.85
Master Lock Coupler Lock: Universal, 1 7/8 In/2 5/16 In/2 In, Powder Coated, (2) Keys Model: 389DAT
Grainger
17K+
$42.85
Master Lock Coupler Lock: Universal, 1 7/8 In/2 5/16 In/2 In, Powder Coated, (2) Keys Model: 389DAT
Grainger
$86.00
Master Lock Barbell Receiver Lock, 5/8" - Pkg Qty 4, 1479DAT
Global Industrial
680
$86.00
Master Lock Barbell Receiver Lock, 5/8" - Pkg Qty 4, 1479DAT
Global Industrial
$17.21
$19.87
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
1K+
13% off
$17.21
$19.87
Master Lock 1471DAT Trailer Coupler Latch Lock, 3-4/10" Long Shackle X 9/32" Diameter Pin
Amazon.com
$119.68
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 4 Pack
Amazon.com
15K+
Free shipping
$119.68
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 4 Pack
Amazon.com
$33.07
Master Lock Receiver/Coupler Lock: 1/2 In/5/8 In, (2) Keys Model: 2848DAT
Grainger
1K+
$33.07
Master Lock Receiver/Coupler Lock: 1/2 In/5/8 In, (2) Keys Model: 2848DAT
Grainger
$85.48
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
17K+
Free shipping
$85.48
Master Lock - Universal Size Fits 1-7/8", 2", And 2-5/16" Couplers - Trailer Locks 389DAT, 3 Pack
Amazon.com
$81.46
Master Lock Coupler Lock: 1/2 In/5/8 in Model: 3794DAT
Grainger
$81.46
Master Lock Coupler Lock: 1/2 In/5/8 in Model: 3794DAT
Grainger
$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
$191.80
Master Lock Coupler Lock, 3/4" Shackle, Solid Brass - Pkg Qty 4, 605DAT
Global Industrial
1K+
$191.80
Master Lock Coupler Lock, 3/4" Shackle, Solid Brass - Pkg Qty 4, 605DAT
Global Industrial
$32.39
MASTER LOCK Coupler Lock, Universal, 389DAT
Zoro.com
10
$32.39
MASTER LOCK Coupler Lock, Universal, 389DAT
Zoro.com
$44.56
Master Lock 1-7/8", 2", And 2-5/16" Trailer Coupler Lock - Gray - Keyed Alike ML377KA
etrailer.com
$44.56
Master Lock 1-7/8", 2", And 2-5/16" Trailer Coupler Lock - Gray - Keyed Alike ML377KA
etrailer.com
$54.49
Master Lock Set - Coupler Ball Lock, Locking Hitch Pin, And Coupler Latch Lock ML44VR
etrailer.com
1K+
$54.49
Master Lock Set - Coupler Ball Lock, Locking Hitch Pin, And Coupler Latch Lock ML44VR
etrailer.com
$75.20
Master Lock Receiver And Coupler Lock Kit, Model 3895Dat
Walmart
10
Free shipping
$75.20
Master Lock Receiver And Coupler Lock Kit, Model 3895Dat
Walmart
$32.74
Master Lock Universal Trailer Coupler Lock 379DAT
etrailer.com
404
$32.74
Master Lock Universal Trailer Coupler Lock 379DAT
etrailer.com
$62.99
Master Lock Towing Security Lock Kit | For Trailers | By West Marine
WestMarine
9
$62.99
Master Lock Towing Security Lock Kit | For Trailers | By West Marine
WestMarine