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Fulton Stamped Coupler Locks

These stamped couplers, originally made by Fulton, are a mainstay for smaller trailers. Here Heartland Lock offer our selection of trailer coupler locks that are designed to fit these stamped couplers. We offer a variety of coupler locks specifically for the Fulton-style couplers as well as a number of universal coupler locks that fit a variety of trailer coupler styles.



Product Image Item Name- Price
Master #37 Laminated Padlock

Master #37 Laminated Padlock

Armored hardened steel shackle defies cutting. 1-9/16" (40mm) laminated steel body for superior strength. 4-pin tumbler cylinder helps prevent...
$11.95

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Trimax TMC10 Trailer Coupler Lock

Trimax TMC10 Trailer Coupler Lock

Easy 1/4 turn of key to lock and unlock. Hardened 1/4" steel shackle. Protective rubber bumper prevents noisy rattle and abrasion. High security...
$11.95

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Trimax TC1 Coupler Lock

Trimax TC1 Coupler Lock

Span = 7/8". Machine hardened stainless steel 9/32" shackle. High security tubular keys. Comes with 2 rugged tubular keys. Weatherproof lock cap...
$15.95

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Trimax SXTC1 Coupler Lock

Trimax SXTC1 Coupler Lock

Span = 7/8". Stainless steel construction. Machine hardened stainless steel 9/32" shackle. High security tubular key. Two tubular keys included....
$22.95

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Master #2878 Coupler Latch Lock

Master #2878 Coupler Latch Lock

Stainless steel components. Fits couplers with a width of 7/8". Fits many Fulton couplers. Keyway cover and shaft seal help keep dirt and moisture...
$6.95

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Trimax SXTC123 Stainless Steel Coupler Lock

Trimax SXTC123 Stainless Steel Coupler Lock

Secures the latch on many trailer coupler latches. Stainless Steel 9/32" (approx.) shaft. Head slides to fits couplers with 7/8, 2-1/2" and 3-1/2"...
$21.95

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Trimax TC123 Coupler Lock

Trimax TC123 Coupler Lock

Secures the latch on many trailer coupler latches. Stainless Steel 9/32" (approx.) shaft. Head slides to fits couplers with 7/8, 2-1/2" and 3-1/2"...
$15.95

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Master #2847 Adjustable Coupler Lock

Master #2847 Adjustable Coupler Lock

Stainless steel components. Fits many Atwood and Fulton couplers. Fits couplers with latch widths up to 2-3/4" Has 6 possible locking positions from...
$7.95

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Trimax SXTM3123 Stainless Steel Combo Set

Trimax SXTM3123 Stainless Steel Combo Set

Set includes SXTC123 coupler lock and SXTS32 Universal Receiver Lock both using the same key. Both are stainless steel. The Trimax SXTC123 has a...
$49.95

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Trimax TM3123 Combo Set

Trimax TM3123 Combo Set

Set includes TC123 coupler lock and TS32 Universal Receiver Lock both using the same key. The Trimax TC123 has a 9/32" (approx.) shaft that is...
$33.95

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Trimax TM3123 Combo Set - Flat Key

Trimax TM3123 Combo Set - Flat Key

Set includes TC123 coupler lock and TS32 Universal Receiver Lock both using the same key. The Trimax TC123 has a 5/16" shaft that is lockable at 13...
$33.95  $19.95
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Trimax UMAX 50 Universal Coupler Lock

Trimax UMAX 50 Universal Coupler Lock

Fits all 1-7/8", 2" and 2-5/16" couplers. Huge 5/8" hardened steel shackle. Powder coated aluminum body resists rust. Huge 6-tooth dual ratchet...
$39.95

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Trimax UMAX 100 Universal Coupler Lock

Trimax UMAX 100 Universal Coupler Lock

Fits all 1-7/8", 2" and 2-5/16" couplers. Huge 5/8" hardened steel shackle. Attractive ballistic grade housing absorbs hammer blows and protects...
$57.95

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Trimax TCP50 - Keyed Alike Towing Set

Trimax TCP50 - Keyed Alike Towing Set

Set contains a Umax50 Universal Coupler Lock, a TC123 Latch Lock and a TS32 Receiver Lock ALL OF WHICH USE THE SAME KEY. The Umax50 Universal...
$82.95

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Trimax TCP100 - Keyed Alike Towing Set

Trimax TCP100 - Keyed Alike Towing Set

Set contains a Umax100 Universal Coupler Lock, a TC123 Latch Lock and a TS32 Receiver Lock ALL OF WHICH USE THE SAME KEY. The Umax100 Universal...
$99.95

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Blaylock TL33 Universal Coupler Lock

Blaylock TL33 Universal Coupler Lock

Fits more than 30 couplers. Precision-made of heavy grade aircraft aluminum. Features a 3/4" steel locking pin. Requires a padlock such as the 70mm...
$29.95

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Master #379DAT Universal Couple Lock

Master #379DAT Universal Couple Lock

Fits 1-7/8", 2", and 2-5/16" couplers manufactured by Reese®, Fulton, Valley, Atwood®, Shelby, Putnam, Hammerblow, Dutton Lainson, and UFP....
$24.95

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Master #379KA Universal Couple Lock

Master #379KA Universal Couple Lock

Fits 1-7/8", 2", and 2-5/16" couplers manufactured by Reese®, Fulton, Valley, Atwood®, Shelby, Putnam, Hammerblow, Dutton Lainson, and UFP....
$29.95

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Master #377 Universal Coupler Lock

Master #377 Universal Coupler Lock

Fits many 1-7/8" and 2" couplers. Adjusts to fit many makes and models. Will NOT fit couplers that do not have a lip, such as Bulldog® couplers....
$29.95

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Master #378 Universal Coupler Lock

Master #378 Universal Coupler Lock

Fits many 2-5/16" couplers. Adjusts to fit many makes and models. Does NOT fit couplers that do not have a lip such as Bulldog® couplers. Not...
$39.95

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