Skip to main content
HalloweenPetLawn & GardenTruck & AutomotiveSporting GoodsHorseFarm & RanchClothingLivestockPet & Animal PharmacyToolsPoultryFencing & GatesHome ImprovementOutdoor LivingHeating & CoolingHome Decor & FurnitureOutdoor Power EquipmentTrailers & TowingBoots & ShoesWild Birds & WildlifeToysGift CardsServices Propane RefillTrailer RentalGarden CenterFeed CenterSame Day DeliveryPetVet ClinicPet WashGrooming at PetsenseDog Training at PetsenseTractor Supply RxPet InsuranceWag!

"Savings and Offers"

Weekly AdSaleClearance

"More Options"

Weekly AdWhat's NewTractor Supply AppEarn Rewards with Neighbor's ClubHometown HeroesLife Out Here BlogTSC Exclusive BrandsTop BrandsClearance ItemsBattery FinderOutdoor Power Equipment Parts FinderHitch Finder

Spend $49.99 to unlock Free Delivery on most orders

|
Learn More
Order statusTSC Credit CardsWhat’s newPetsenseWeekly Ad
​
Sign In / EnrollGet rewarded!
​
Halloween
Pet
Lawn & Garden
Truck & Automotive
Sporting Goods
Horse
Farm & Ranch
Clothing
Livestock
Pet & Animal Pharmacy
Tools
Poultry
Fencing & Gates
Home Improvement
Outdoor Living
Heating & Cooling
Menu

Search

Home

Sign In

Cart
0.0
(0)
0.0 out of 5 stars.
A woman outside with a dog
A woman outside with a dog
  1. Home
  2. /
  3. Trailers & Towing
  4. /
  5. Hitches & Ball Mounts
  6. /
  7. Towing Parts
  8. /

  9. InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S

  1. Home
  2. /
  4. /
  5. Towing Parts

InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S

Shop all InfiniteRule Security

  • New Arrival

  • Online Only

InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S

Item # 6125704

InfiniteRule Security InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S
InfiniteRule Security InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S
$69.99

Add this item to unlock free delivery!

Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

Shop all InfiniteRule Security

  • New Arrival

  • Online Only

InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S

Item # 6125704

InfiniteRule Security InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S
InfiniteRule Security InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61121-S

$69.99
financeCard Logo
New Cardmembers earn a $20 Reward‡ with qualifying purchase of $20 or more plus earn 5% in Rewards+ on this purchase. Valid through 8/9/26.

Add this item to unlock free delivery!

This item is available online only

Delivery to

Free standard delivery on online footwear & Clothing purchases of $49 and over.

​
Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

The infiniterule trailer latch lock is precision-engineered specifically for the DEMCO EZ latch - 2 Inch ball - cast coupler. Built for strength and security, this lock is trusted by rv owners, boaters, and contractors who demand reliable trailer protection. Unlike loose-fitting universal locks, ensuring a precise fit that provides stronger deterrence against theft.

  • CNC Machined Stainless Steel: Solid Stainless Construction Resists Cutting, Prying, Rust, And Long-Term Wear
  • Purpose-Built Fit: Exact Fit For DEMCO EZ Latch 2 Inch Cast Couplers - Not A One-Size-Fits-All Lock
  • Protective Keyway Cap: Tight-Sealing O-Ring And Rubber Cover Help Keep Water, Dirt, And Debris Out For Smooth Operation
  • Independently Tested: Rigorously Tested By Trusted 3rd-Party Solutions For Consistent Strength And Reliability
  • Security Through Deterrence: No Lock Is Unbreakable, But InfiniteRule Locks Are Significantly Stronger And More Tamper-Resistant Than Low-Cost, Universal Alternatives
  • BUILT FOR REAL TOWING - Trusted On RV, Camper, And Work Trailers For Stronger Deterrence, Precise Fitment, And Long-Term Reliability
  • Every InfiniteRule Lock Is 100 Percent Made In The USA
BrandInfiniteRule Security
Country of OriginMade in USA
CompatibilityUniversal
Package Quantity1
Primary ColorWhite
Product Height1 in.
Product Length3 in.
Product Weight0.2 lb.
Product Width2 in.
Trailer Hitch Accessory TypeOther
WarrantyLimited 1 Year Warranty
Manufacturer Part NumberINF61121S
No questions have been asked about this product.

No questions have been asked about this product.

Q&As

No questions have been asked about this product.

No questions have been asked about this product.

Similar Items

  1. InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61130-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61130-S

    $69.99
  2. InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61180-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 2-15/16 L in. Span, 61180-S

    $69.99
  3. InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 1-1/8 L in. Span, 61106-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 1-1/8 L in. Span, 61106-S

    $69.99
  4. InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 3-1/8 L in. Span, 61199-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Trailer Coupler Lock, 1/4 D x 3-1/8 L in. Span, 61199-S

    $69.99
  5. InfiniteRule Security Universal Trailer Coupler Lock, Hitch Ball and Pin Type, 61118-BX
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Universal Trailer Coupler Lock, Hitch Ball and Pin Type, 61118-BX

    $129.99
  6. InfiniteRule Security Stainless Steel Hitch Pin Lock for 3 in. Receiver, 5/8 in. Diameter, 61073-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Pin Lock for 3 in. Receiver, 5/8 in. Diameter, 61073-S

    $44.99
  7. InfiniteRule Security Stainless Steel Hitch Pin Lock for 2 in. Receiver, 5/8 in. Diameter, 61194-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Pin Lock for 2 in. Receiver, 5/8 in. Diameter, 61194-S

    $46.99
  8. InfiniteRule Security Stainless Steel Hitch Lock Set for B&W 3 in. Tow and Stow Hitches, Set of 4, 61681-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Lock Set for B&W 3 in. Tow and Stow Hitches, Set of 4, 61681-S

    $194.99
  9. Top Rated
    InfiniteRule Security Stainless Steel Class III-IV-V Trailer Hitch Pin Lock, 5/8 in. Diameter, 61072-S
    5.0 out of 5 stars with 1 reviews
    5.0 (1)

    InfiniteRule Security Stainless Steel Class III-IV-V Trailer Hitch Pin Lock, 5/8 in. Diameter, 61072-S

    $43.99
  10. InfiniteRule Security Stainless Steel Hitch Pin Lock for Curt 2 in. Alumalite Adjustable Hitch, Set of 2, 61420-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Pin Lock for Curt 2 in. Alumalite Adjustable Hitch, Set of 2, 61420-S

    $88.99
  11. InfiniteRule Security Stainless Steel Hitch Pin Lock for B&W 2 in. and 2-1/2 in. Tow and Stow Hitches, Single, 61075-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Pin Lock for B&W 2 in. and 2-1/2 in. Tow and Stow Hitches, Single, 61075-S

    $45.99
  12. InfiniteRule Security Stainless Steel Hitch Lock Set for B&W 2 in. and 2-1/2 in. Tow and Stow Hitches, Set of 4, 61677-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Lock Set for B&W 2 in. and 2-1/2 in. Tow and Stow Hitches, Set of 4, 61677-S

    $179.99

Items You May Like

  1. CURT Replacement 2 in. Adjustable Channel Mount Shank (Fits #45901, 6,000 lb.), 45911
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Replacement 2 in. Adjustable Channel Mount Shank (Fits #45901, 6,000 lb.), 45911

    $67.49
    Was $74.99Save $7.50
  2. Top Rated
    CURT 5th Wheel Kingpin Lock for 2 in. Diameter Kingpins
    5.0 out of 5 stars with 2 reviews
    5.0 (2)

    CURT 5th Wheel Kingpin Lock for 2 in. Diameter Kingpins

    $49.49
    Was $59.99Save $10.50
  3. Tractor Supply 2 in. Class IV Hitch Ball, 7,500 lb. Capacity, Stainless
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Tractor Supply 2 in. Class IV Hitch Ball, 7,500 lb. Capacity, Stainless

    $39.99
  4. InfiniteRule Security Stainless Steel Hitch Lock Set for Adjustable Hitches: 2 Hitch Locks, 1 Receiver Lock, 61801-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Lock Set for Adjustable Hitches: 2 Hitch Locks, 1 Receiver Lock, 61801-S

    $134.99
  5. CURT Professional Finishing Pack (50 Pieces), 22322
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Professional Finishing Pack (50 Pieces), 22322

    $31.49
    Was $34.99Save $3.50
  6. CURT 2-To-3-Wire Taillight Converter, 56196
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT 2-To-3-Wire Taillight Converter, 56196

    $31.49
    Was $39.99Save $8.50
  7. CURT Hitch-Mounted Winch Mount, Fits 2 in. Receiver
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Hitch-Mounted Winch Mount, Fits 2 in. Receiver

    $153.38
  8. Buyers Products Stake Assembly
    3.7 out of 5 stars with 3 reviews
    3.7 (3)

    Buyers Products Stake Assembly

    $41.99
  9. CURT Custom Tow Bar Base Plate, Select Ford Explorer, 70114
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Custom Tow Bar Base Plate, Select Ford Explorer, 70114

    $544.99
  10. CURT Replacement Combination Trailer Light Rear Lens
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Replacement Combination Trailer Light Rear Lens

    $9.99
  11. InfiniteRule Security Trailer Locks, Set Of 3: Coupler Lock, Latch Lock, Receiver Lock, Keyed Alike, 61636-BX
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Trailer Locks, Set Of 3: Coupler Lock, Latch Lock, Receiver Lock, Keyed Alike, 61636-BX

    $249.99
  12. Buyers Products Tie Rod Style Cylinder-Clevis Mount-0.75 Rod x 8 in. Stroke
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Buyers Products Tie Rod Style Cylinder-Clevis Mount-0.75 Rod x 8 in. Stroke

    $94.99

Customers Also Bought

  1. InfiniteRule Security Stainless Steel Hitch Pin Lock for B&W 2 in. and 2-1/2 in. Tow and Stow Hitches, Set of 3, 61675-S
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Stainless Steel Hitch Pin Lock for B&W 2 in. and 2-1/2 in. Tow and Stow Hitches, Set of 3, 61675-S

    $134.99
  2. Tow Tuff Dumpster Dolly, 200 lb. Capacity, Fits Over 2 in. Ball
    3.7 out of 5 stars with 17 reviews
    3.7 (17)

    Tow Tuff Dumpster Dolly, 200 lb. Capacity, Fits Over 2 in. Ball

    $79.99
  3. CURT Extended View Tow Mirror
    4.3 out of 5 stars with 3 reviews
    4.3 (3)

    CURT Extended View Tow Mirror

    $33.29
    Was $34.99Save $1.70
  4. CURT Rambler Tow Bar Lock Set, 70005
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Rambler Tow Bar Lock Set, 70005

    $64.99
  5. CURT Custom Tow Bar Base Plate, Select Ford F-150
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Custom Tow Bar Base Plate, Select Ford F-150

    $544.99
  6. Buyers Products Tow Eye Receiver Mount
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Buyers Products Tow Eye Receiver Mount

    $59.99
  7. CURT Custom Tow Bar Base Plate, Select Ford Ranger, 70127
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Custom Tow Bar Base Plate, Select Ford Ranger, 70127

    See Price at Checkout
  8. Top Rated
    CURT Raised Receiver Adapter, 2 in. Shank, Not for Towing Use, 4-1/4 in. Rise
    5.0 out of 5 stars with 1 reviews
    5.0 (1)

    CURT Raised Receiver Adapter, 2 in. Shank, Not for Towing Use, 4-1/4 in. Rise

    $99.99
  9. CURT Custom Tow Bar Base Plate, Select Jeep Wrangler JK, 70102
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Custom Tow Bar Base Plate, Select Jeep Wrangler JK, 70102

    See Price at Checkout
  10. CURT Custom Tow Bar Base Plate, Select Ram 1500, 70121
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Custom Tow Bar Base Plate, Select Ram 1500, 70121

    $544.99
  11. InfiniteRule Security Trailer Locks, Set Of 3: Coupler Lock, Latch Lock, Receiver Lock, Keyed Alike, 61637-BX
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    InfiniteRule Security Trailer Locks, Set Of 3: Coupler Lock, Latch Lock, Receiver Lock, Keyed Alike, 61637-BX

    $259.99
  12. CURT Custom Tow Bar Base Plate, Select Honda CR-V, 70104
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CURT Custom Tow Bar Base Plate, Select Honda CR-V, 70104

    $544.99

Reviews

Review this Product

Select to rate the item with 1 star. This action will open submission form.
Select to rate the item with 2 stars. This action will open submission form.
Select to rate the item with 3 stars. This action will open submission form.
Select to rate the item with 4 stars. This action will open submission form.
Select to rate the item with 5 stars. This action will open submission form.
Be the first to review this product
Get the top deals, latest trends and more
Sign up for emails from Tractor Supply today.
First Name*
Last Name*
Email*

Customer Support

  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  

    (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

About Us

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

Work With Us

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

Neighbor's Club

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

Credit Center

  • TSC Credit Card

  • Klarna

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More
  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

  • TSC Credit Card

  • Klarna

Connect & Share with the Tractor Supply Community.

Shop on the go with the Tractor Supply App

Learn More
  • Privacy policy
  • Your Privacy Choices
  • Terms and Conditions
  • California Transparency Act
  • Legal Notices
  • Accessibility
  • Responsible Disclosure Statement
  • Surprise (Balance) Medical Billing Disclosure
  • Transparency in Coverage
  • Human Rights Policy
  • Vendor Code of Conduct
  • California Notice of Collection
  • Privacy Requests

© 2026, Tractor Supply Co. All Rights Reserved.