{"product_id":"curt-trailer-tongue-coupler-lock-black-padlock-style-1-4-inch-pin-fits-up-to-3-4-inch-span","title":"CURT Trailer Tongue Coupler Lock Black — Padlock-Style, 1\/4-Inch Pin, Fits up to 3\/4-Inch Span","description":"\u003cp\u003e\u003cstrong\u003eThe CURT 23521 black coupler lock is a padlock-style trailer tongue lock with a 1\/4-inch pin and up to a 3\/4-inch span that secures latch-type couplers and includes two keys.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you tow a boat, camper, or utility trailer, a simple safety pin or non-locking latch can leave your trailer vulnerable to tampering. The CURT 23521 adds a keyed, padlock-style layer of protection by locking the coupler latch in place so the trailer remains attached only to the vehicle you choose. Built from high-strength steel with a weather-resistant finish and a zinc-plated pin, this coupler lock is designed for everyday use and visible theft deterrence.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this lock stop unauthorized uncoupling?\u003c\/h3\u003e\n\u003cp\u003eThe CURT 23521 locks the coupler latch mechanism rather than only retaining a pin, preventing the latch from being released without the key. Its padlock-style housing surrounds the pin and reduces access for bolt cutters and prying tools, while the visible black finish signals added security to would-be thieves.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eKey-operated padlock design secures the latch in place.\u003c\/li\u003e\n  \u003cli\u003e1\/4\" diameter pin resists bending under force.\u003c\/li\u003e\n  \u003cli\u003ePadlock-style body shields the pin from direct tampering.\u003c\/li\u003e\n  \u003cli\u003eIncluded two keys allow for a spare or shared access.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this coupler lock fit my trailer's latch?\u003c\/h3\u003e\n\u003cp\u003eThis model is made for latch-type couplers that accept a retaining pin up to a 3\/4-inch span and a 1\/4-inch diameter pin. Measure the gap of your coupler latch to confirm compatibility; if the span or hole diameter exceeds these dimensions, choose a different model.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits latch-type couplers with up to 3\/4\" pin span.\u003c\/li\u003e\n  \u003cli\u003ePin diameter: 1\/4\" — standard for many trailer latches.\u003c\/li\u003e\n  \u003cli\u003eIdeal for conventional ball-coupler latch retainers.\u003c\/li\u003e\n  \u003cli\u003eNot for weight-distributing or unique custom coupler systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is the lock against weather and corrosion?\u003c\/h3\u003e\n\u003cp\u003eCURT engineered this coupler lock to withstand outdoor exposure. The lock body carries a black painted finish to resist surface wear and the pin is zinc plated to limit corrosion where metal contacts the coupler, helping maintain reliable operation in wet or salty conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBlack painted finish helps protect the housing from chips and rust.\u003c\/li\u003e\n  \u003cli\u003eZinc-plated pin reduces corrosion at the contact point.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel construction for long-term durability.\u003c\/li\u003e\n  \u003cli\u003eSimple 1\/4-turn lock operation reduces internal wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow convenient is daily use and key management?\u003c\/h3\u003e\n\u003cp\u003eThe CURT 23521 is designed for quick locking and unlocking during routine coupling tasks. The lock uses a straightforward 1\/4-turn key action and comes with two keys so you can keep a spare in a secure place or provide a backup to a travel partner.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-turn activation for fast operation.\u003c\/li\u003e\n  \u003cli\u003eTwo keys included—one spare for emergencies.\u003c\/li\u003e\n  \u003cli\u003ePadlock form factor makes it easy to grasp and operate with gloves.\u003c\/li\u003e\n  \u003cli\u003eVisible deterrent that doesn’t require complex procedures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The CURT 23521 is aimed at owners of boats, campers, ATV trailers, and general utility trailers that use latch-type couplers with a 3\/4-inch or smaller span. It fits users who want a straightforward, keyed locking solution that’s portable, durable, and simple to operate—ideal for daily drivers, weekend recreational users, and fleet vehicles seeking basic added security without complicated installation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What size coupler does this lock fit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits latch-type couplers with up to a 3\/4-inch span and accepts a 1\/4-inch diameter pin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many keys come with the lock?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Two keys are included so you have a spare for emergencies or shared access.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"CURT","offers":[{"title":"Default Title","offer_id":48084323762334,"sku":"B00T9N6H06","price":30.45,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/curt-23521-front-view.jpg?v=1785849895","url":"https:\/\/northtrailauto.ca\/products\/curt-trailer-tongue-coupler-lock-black-padlock-style-1-4-inch-pin-fits-up-to-3-4-inch-span","provider":"North Trail Auto","version":"1.0","type":"link"}