{"title":"Trailer Coupler \u0026 Puck Locks","description":"\u003cp\u003eChoose a trailer lock for the connection you need to secure: a compatible parked-trailer coupler, a coupler with safety-chain storage, or a door hasp. Start with the marked ball size, then match the coupler profile in the product gallery.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/products\/2-5-16-in-trailer-coupler-and-safety-chain-lock\"\u003eCoupler + chain storage\u003c\/a\u003e · \u003ca href=\"\/products\/2-5-16-in-coupler-lock-for-select-bulldog-and-ram-couplers\"\u003eSelect Bulldog \/ Ram profiles\u003c\/a\u003e · \u003ca href=\"\/products\/trailer-coupler-lock-1-7-8-2-and-2-5-16-in\"\u003eMulti-size coupler lock\u003c\/a\u003e · \u003ca href=\"#nw-buying-guide\"\u003eCompare all options ↓\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eWhich trailer lock should I choose?\u003c\/h2\u003e\n\u003cdiv class=\"nw-guide-table\" tabindex=\"0\" role=\"region\" aria-label=\"Compare NIWNIW trailer lock applications\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eYour priority\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eStart here\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat determines fit\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoupler and safety-chain storage\u003c\/th\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/2-5-16-in-trailer-coupler-and-safety-chain-lock\"\u003eUTTC Coupler \u0026amp; Safety Chain Lock\u003c\/a\u003e\u003cbr\u003eSeparate 2 in and 2-5\/16 in configurations\u003c\/td\u003e\n\u003ctd\u003eSelected size, coupler body and latch, enclosure clearance and space for the chains.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSelect Bulldog or Ram couplers\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/2-5-16-in-coupler-lock-for-select-bulldog-and-ram-couplers\"\u003eCTT-B 2-5\/16 in Coupler Lock\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eExact coupler profile and surrounding hardware. The brand name alone does not confirm fit.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e1-7\/8, 2 or 2-5\/16 in applications\u003c\/th\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/trailer-coupler-lock-1-7-8-2-and-2-5-16-in\"\u003eTTS-1 Multi-Size Coupler Lock\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eDiagram opening: 4.37 in wide × 2.62 in high. Couplers wider than 4.37 in are not suitable; profile and latch clearance must also match.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEnclosed-trailer doors or vehicle hasps\u003c\/th\u003e\n\u003ctd\u003e\n\u003ca href=\"\/products\/xl-keyed-alike-puck-locks-black-2-pack\"\u003eXL Keyed-Alike Puck Locks\u003c\/a\u003e\u003cbr\u003e2, 3 or 4 locks per pack\u003c\/td\u003e\n\u003ctd\u003eEach hasp's dimensions, rear opening and locking-pin clearance. Keys match within the purchased pack; separate packs may differ.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003ch2\u003eMatch the diagram before you order\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eRead the coupler marking.\u003c\/strong\u003e Confirm 1-7\/8 in, 2 in or 2-5\/16 in on your equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen the product's gallery.\u003c\/strong\u003e Compare your actual coupler with that lock's compatible and incompatible profile illustrations. Charts for different lock designs are not interchangeable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck working space.\u003c\/strong\u003e Compare the listed dimensions and allow clearance for the latch, jack, brackets, chains and key operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/coupler-identification-guide\"\u003eIdentify your coupler from real photos\u003c\/a\u003e · \u003ca href=\"\/blogs\/field-notes\/trailer-coupler-lock-fit-checklist\"\u003eFollow the full fit checklist\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eCoupler lock, hitch pin lock or puck lock?\u003c\/h2\u003e\u003cp\u003eA coupler enclosure covers a compatible unhitched, parked-trailer coupler to obstruct a new hookup. A receiver hitch pin lock secures a ball mount or accessory inside the tow vehicle's receiver. A door puck lock secures a compatible hasp. These designs protect different connections and are not interchangeable.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/field-notes\/trailer-coupler-lock-fit-checklist#hitched-unhitched\"\u003eLocking a trailer: hitched vs. unhitched\u003c\/a\u003e · \u003ca href=\"\/blogs\/field-notes\/keyed-alike-puck-locks-pack-guide#enclosed-trailer\"\u003eChoosing locks for an enclosed trailer\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eCommon questions before buying\u003c\/h2\u003e\n\u003ch3\u003eWill any 2-5\/16 in coupler lock fit?\u003c\/h3\u003e\u003cp\u003eNo. Ball diameter alone does not establish compatibility. Check the exact lock's coupler chart, dimensions and latch clearance.\u003c\/p\u003e\n\u003ch3\u003eIs a 2-inch option suitable for a 50 mm coupler?\u003c\/h3\u003e\u003cp\u003eDo not assume so. Two inches equals 50.8 mm. Follow the marked coupler size and the exact lock instructions.\u003c\/p\u003e\n\u003ch3\u003eWhat should I look for in a heavy-duty trailer tongue lock?\u003c\/h3\u003e\u003cp\u003eCheck the enclosure's fit, coverage, materials and access for normal locking and unlocking. Weight alone is not a security rating, and no lock guarantees prevention of every theft attempt.\u003c\/p\u003e\n\u003ch3\u003eCan I use one key for all my locks?\u003c\/h3\u003e\u003cp\u003eNIWNIW XL puck-lock keys match within the purchased pack. Matching across separate packs or with a coupler lock is not guaranteed. \u003ca href=\"\/blogs\/field-notes\/keyed-alike-puck-locks-pack-guide\"\u003eCompare keyed-alike pack options\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStill unsure?\u003c\/strong\u003e \u003ca href=\"\/pages\/contact\"\u003eAsk NIWNIW about your setup\u003c\/a\u003e with the coupler model, marked size, photos and relevant measurements. \u003ca href=\"\/policies\/shipping-policy\"\u003eDelivery details\u003c\/a\u003e · \u003ca href=\"\/policies\/refund-policy\"\u003e30-day return conditions\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"2-5-16-in-trailer-coupler-and-safety-chain-lock","title":"Trailer Coupler \u0026 Safety Chain Lock — 2 or 2-5\/16 in","description":"\u003ch2\u003eTrailer coupler lock with safety-chain storage\u003c\/h2\u003e\u003cp\u003eA carbon-steel enclosure for a compatible unhitched, parked trailer, with space for safety chains and a push-to-lock puck mechanism. Choose the separate 2-inch or 2-5\/16-inch configuration that matches your coupler, then check its body profile and latch clearance against the gallery fit chart.\u003c\/p\u003e\u003ch3\u003eProduct highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon steel enclosure.\u003c\/strong\u003e A heavy-duty steel body surrounds the compatible coupler and lock mechanism to add a physical theft deterrent. No lock can prevent every theft attempt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePush-to-lock operation.\u003c\/strong\u003e Secure the puck lock with a push; use one of the three included keys to unlock it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose the matching coupler size.\u003c\/strong\u003e Compare the coupler profile, latch and surrounding clearance with the fit photographs. Ball size alone does not confirm fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePowder-coated finish.\u003c\/strong\u003e The coated steel body is designed for outdoor trailer applications. Choose your color and coupler size above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety chain storage.\u003c\/strong\u003e The enclosure provides space to contain compatible safety chains as part of your parked-trailer security setup. Check chain and coupler clearance before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel\u003c\/th\u003e\n\u003ctd\u003eUTTC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoupler size\u003c\/th\u003e\n\u003ctd\u003eSelect 2 in or 2-5\/16 in above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eDoes ball size alone confirm fit?\u003c\/h3\u003e\u003cp\u003eNo. Coupler shape, latch position and surrounding clearance also matter. Compare your coupler with the product dimensions and photographs.\u003c\/p\u003e\u003csection id=\"niwniw-before-order\"\u003e\u003ch3\u003eBefore you order: fit checklist\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSelected configuration\u003c\/th\u003e\n\u003ctd\u003eChoose the color and either 2 in or 2-5\/16 in above; sizes are separate configurations.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCheck on your trailer\u003c\/th\u003e\n\u003ctd\u003eCoupler profile, latch position, surrounding clearance and the space needed for your safety chains.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eIntended use\u003c\/th\u003e\n\u003ctd\u003eSecurity for a parked trailer. Ball diameter alone does not establish fit.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eNeed a fit check? \u003ca href=\"\/pages\/contact\"\u003eContact NIWNIW\u003c\/a\u003e with the product name, your equipment model, clear photos and the measurements above. Please wait for confirmation if any detail is unclear.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/policies\/shipping-policy\"\u003eShipping estimates\u003c\/a\u003e · \u003ca href=\"\/policies\/refund-policy\"\u003e30-day return policy and conditions\u003c\/a\u003e\u003c\/p\u003e\u003c\/section\u003e","brand":"NIWNIW","offers":[{"title":"Silver \/ 2-5\/16 in","offer_id":67923101417794,"sku":"B0D9M6ZW66","price":862.84,"currency_code":"HKD","in_stock":true},{"title":"Red \/ 2-5\/16 in","offer_id":67928659132738,"sku":"B0F6MZNC1P","price":1019.75,"currency_code":"HKD","in_stock":true},{"title":"Black \/ 2-5\/16 in","offer_id":67928659165506,"sku":"B0F6N18JK7","price":1019.75,"currency_code":"HKD","in_stock":true},{"title":"Blue \/ 2-5\/16 in","offer_id":67928659198274,"sku":"B0F6N39WKS","price":1019.75,"currency_code":"HKD","in_stock":true},{"title":"Silver \/ 2 in","offer_id":67928659231042,"sku":"B0D9M815Z9","price":862.84,"currency_code":"HKD","in_stock":true},{"title":"Black \/ 2 in","offer_id":67928659263810,"sku":"B0F6N2TVK8","price":1019.75,"currency_code":"HKD","in_stock":true},{"title":"Blue \/ 2 in","offer_id":67928659296578,"sku":"B0F6N3K18S","price":1019.75,"currency_code":"HKD","in_stock":true},{"title":"Red \/ 2 in","offer_id":67928659329346,"sku":"B0F6N4QV9B","price":1019.75,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/6060\/8066\/files\/b0d9m6zw66-niwniw.jpg?v=1793786072"},{"product_id":"xl-keyed-alike-puck-locks-black-2-pack","title":"XL Keyed-Alike Puck Locks for Trailer Door Hasps — Black","description":"\u003ch2\u003eHidden-shackle puck locks for compatible door hasps\u003c\/h2\u003e\u003cp\u003eBlack XL puck locks with a stepped-back rear opening for compatible enclosed-trailer, truck and van door hasps. Choose a 2-, 3- or 4-lock pack; keys match within the purchased pack. Compare every hasp with the rear-opening diagram before ordering.\u003c\/p\u003e\u003ch3\u003eProduct highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6061 aluminum with anodized finish.\u003c\/strong\u003e Built from 6061 aluminum for a dependable balance of strength, corrosion resistance, and manageable weight. The anodized finish forms an integrated protective oxide layer that helps resist moisture, surface wear, and regular outdoor exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHidden shackle security design.\u003c\/strong\u003e The round lock body surrounds the shackle and locking pin, reducing exposed areas accessible to bolt cutters and prying tools. This concealed design helps deter tampering and provides added protection for cargo, tools, equipment, and stored belongings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepped-back fit for trailer hasps.\u003c\/strong\u003e The stepped-back design creates an enlarged rear opening for compatible swivel hasps commonly found on rear and side enclosed trailer doors. The additional clearance helps the puck lock engage securely around the hasp. Measure your hasp before ordering to confirm compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-push locking.\u003c\/strong\u003e Secure each trailer door lock with one firm push—no key is required when locking. The spring-loaded mechanism makes frequent loading, unloading, deliveries, and storage stops quicker and easier, while a key is required for controlled unlocking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeyed alike within each pack.\u003c\/strong\u003e Choose 2, 3 or 4 black locks, supplied with 6, 9 or 12 keys respectively. Each supplied key operates every lock within that purchased pack; separate packs are not guaranteed to match.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel\u003c\/th\u003e\n\u003ctd\u003eBQS-001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePack size\u003c\/th\u003e\n\u003ctd\u003eSelect 2, 3 or 4 locks above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eKeying\u003c\/th\u003e\n\u003ctd\u003eKeyed alike within this pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWill another pack use the same key?\u003c\/h3\u003e\u003cp\u003eMatching keys are specified within this pack only. Separate purchases are not guaranteed to share a key pattern.\u003c\/p\u003e\u003csection id=\"niwniw-before-order\"\u003e\u003csection\u003e\u003ch3\u003eFit details from the product diagram\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto\" tabindex=\"0\" role=\"region\" aria-label=\"Diagram fit details\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eMeasurement or condition\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eProduct information\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eRear opening (width × height × depth)\u003c\/th\u003e\n\u003ctd\u003e1-3\/4 × 7\/8 × 1-1\/8 in, as shown in the fit diagram\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHasp exclusions\u003c\/th\u003e\n\u003ctd\u003eThe two container-door latch styles marked incompatible in the fit chart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\n\u003ch3\u003eBefore you order: fit checklist\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eChoose your pack\u003c\/th\u003e\n\u003ctd\u003eSelect 2, 3 or 4 locks above. Keys match within each pack; separate packs may use different key patterns.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCheck your hasp\u003c\/th\u003e\n\u003ctd\u003eMeasure the hasp and compare the rear opening, locking-pin engagement and clearance with the product photographs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBefore relying on the lock\u003c\/th\u003e\n\u003ctd\u003eConfirm full engagement and normal locking\/unlocking with the supplied keys.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eNeed a fit check? \u003ca href=\"\/pages\/contact\"\u003eContact NIWNIW\u003c\/a\u003e with the product name, your equipment model, clear photos and the measurements above. Please wait for confirmation if any detail is unclear.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/policies\/shipping-policy\"\u003eShipping estimates\u003c\/a\u003e · \u003ca href=\"\/policies\/refund-policy\"\u003e30-day return policy and conditions\u003c\/a\u003e\u003c\/p\u003e\u003c\/section\u003e","brand":"NIWNIW","offers":[{"title":"2 locks","offer_id":67924406993218,"sku":"B0HF7TW9PC","price":392.11,"currency_code":"HKD","in_stock":true},{"title":"3 locks","offer_id":67928662147394,"sku":"B0HF7V7T9C","price":549.02,"currency_code":"HKD","in_stock":true},{"title":"4 locks","offer_id":67928662180162,"sku":"B0HF7NQM4M","price":627.48,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/6060\/8066\/files\/b0hf7tw9pc-niwniw.jpg?v=1793127250"},{"product_id":"2-5-16-in-coupler-lock-for-select-bulldog-and-ram-couplers","title":"2-5\/16 in Coupler Lock for Select Bulldog \u0026 Ram Couplers","description":"\u003ch2\u003eCoupler lock for select 2-5\/16 in Bulldog and Ram profiles\u003c\/h2\u003e\u003cp\u003eA steel coupler lock designed around select 2-5\/16-inch Bulldog and Ram couplers. Check the coupler profile as well as the ball size.\u003c\/p\u003e\u003ch3\u003eProduct highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel security body.\u003c\/strong\u003e A carbon-steel enclosure and protected puck mechanism add a physical barrier around a compatible coupler. No lock guarantees protection against every attack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePush-to-lock design.\u003c\/strong\u003e Lock the mechanism with a push and use an included key for authorized unlocking. Three keys are included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelect Bulldog and RAM couplers.\u003c\/strong\u003e Designed for compatible 2-5\/16-inch Bulldog or Ram couplers. Check the profile, latch and fit diagram before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePowder-coated finish.\u003c\/strong\u003e Coated steel construction for outdoor trailer use. Keep the mechanism clear of debris and inspect it during use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoverage and clearance.\u003c\/strong\u003e The enclosure shields the coupler connection. Verify surrounding hardware and clearance on your specific trailer; fit is model-dependent.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel\u003c\/th\u003e\n\u003ctd\u003eCTT-B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoupler size\u003c\/th\u003e\n\u003ctd\u003e2-5\/16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e4.6 × 4.4 × 8.4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e10.25 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eDoes it fit every Bulldog or Ram coupler?\u003c\/h3\u003e\u003cp\u003eNo. Compatibility depends on the specific coupler shape and clearance. Compare the product dimensions and photographs with your coupler before ordering.\u003c\/p\u003e\u003csection id=\"niwniw-before-order\"\u003e\u003ch3\u003eBefore you order: fit checklist\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoupler identification\u003c\/th\u003e\n\u003ctd\u003eFor select 2-5\/16 in Bulldog and Ram couplers; the brand name and ball size do not establish universal fit.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCompare before ordering\u003c\/th\u003e\n\u003ctd\u003eMatch the actual coupler profile, latch position and surrounding hardware with the fit photographs and product dimensions.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eIntended use\u003c\/th\u003e\n\u003ctd\u003eA physical security barrier for a parked trailer. No lock guarantees prevention of every theft attempt.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eNeed a fit check? \u003ca href=\"\/pages\/contact\"\u003eContact NIWNIW\u003c\/a\u003e with the product name, your equipment model, clear photos and the measurements above. Please wait for confirmation if any detail is unclear.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/policies\/shipping-policy\"\u003eShipping estimates\u003c\/a\u003e · \u003ca href=\"\/policies\/refund-policy\"\u003e30-day return policy and conditions\u003c\/a\u003e\u003c\/p\u003e\u003c\/section\u003e","brand":"NIWNIW","offers":[{"title":"Default Title","offer_id":67924408172866,"sku":"B0F6N8Y9K5","price":627.48,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/6060\/8066\/files\/b0f6n8y9k5-niwniw.jpg?v=1793127250"},{"product_id":"trailer-coupler-lock-1-7-8-2-and-2-5-16-in","title":"Trailer Coupler Lock — 1-7\/8, 2 \u0026 2-5\/16 in","description":"\u003ch2\u003eCoupler lock for three listed ball sizes\u003c\/h2\u003e\u003cp\u003eA carbon-steel lock for compatible 1-7\/8-inch, 2-inch and 2-5\/16-inch trailer couplers. Confirm the coupler profile and clearance before ordering.\u003c\/p\u003e\u003ch3\u003eProduct highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon steel construction.\u003c\/strong\u003e A steel body provides a physical deterrent at the coupler. No lock can eliminate all risk of theft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-motion locking.\u003c\/strong\u003e Slide the bolt into position and press the cylinder to lock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree ball-size applications.\u003c\/strong\u003e For compatible 1-7\/8-inch, 2-inch and 2-5\/16-inch couplers. Confirm the actual coupler shape and latch clearance before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective dust covers.\u003c\/strong\u003e Silicone covers help shield the mechanism from debris and weather exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpare-key convenience.\u003c\/strong\u003e Supplied with spare keys and core protectors for everyday trailer storage and shared access.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel\u003c\/th\u003e\n\u003ctd\u003eTTS-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCoupler sizes\u003c\/th\u003e\n\u003ctd\u003e1-7\/8, 2 and 2-5\/16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eFit opening: 4.37 in wide × 2.62 in high (diagram)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eDoes it fit every coupler in these sizes?\u003c\/h3\u003e\u003cp\u003eNo. Ball size is only one part of fitment. Verify the coupler body, latch and surrounding clearance against the product photographs and dimensions.\u003c\/p\u003e\u003csection id=\"niwniw-before-order\"\u003e\u003csection\u003e\u003ch3\u003eFit details from the product diagram\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto\" tabindex=\"0\" role=\"region\" aria-label=\"Diagram fit details\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eMeasurement or condition\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eProduct information\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFit opening (diagram)\u003c\/th\u003e\n\u003ctd\u003e4.37 in wide × 2.62 in high\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMaximum coupler width\u003c\/th\u003e\n\u003ctd\u003eNot suitable for couplers wider than 4.37 in; body profile and latch must also match\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\n\u003ch3\u003eBefore you order: fit checklist\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBall-size applications\u003c\/th\u003e\n\u003ctd\u003eCompatible 1-7\/8 in, 2 in and 2-5\/16 in couplers; confirm the actual body and latch profile as well.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCompare before ordering\u003c\/th\u003e\n\u003ctd\u003eCheck the coupler body, latch and surrounding clearance against the photographs and listed dimensions.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eIntended use\u003c\/th\u003e\n\u003ctd\u003eParked-trailer security. Follow the supplied locking and unlocking instructions.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eNeed a fit check? \u003ca href=\"\/pages\/contact\"\u003eContact NIWNIW\u003c\/a\u003e with the product name, your equipment model, clear photos and the measurements above. Please wait for confirmation if any detail is unclear.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/policies\/shipping-policy\"\u003eShipping estimates\u003c\/a\u003e · \u003ca href=\"\/policies\/refund-policy\"\u003e30-day return policy and conditions\u003c\/a\u003e\u003c\/p\u003e\u003c\/section\u003e","brand":"NIWNIW","offers":[{"title":"Default Title","offer_id":67924408303938,"sku":"B0DZNR5VDY","price":521.56,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/6060\/8066\/files\/b0dznr5vdy-niwniw.jpg?v=1793786071"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/6060\/8066\/collections\/b0hf7tw9pc-niwniw.jpg?v=1793111671","url":"https:\/\/viableanchor.com\/collections\/trailer-locks.oembed","provider":"NiwNiw","version":"1.0","type":"link"}