{"product_id":"lmkp-square-flange-linear-bearings-uu-luu","title":"LMKP6~LMKP60 Guide Square Flange Linear Bearings Linear Motion Bearing UU\/ LUU","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eLMKP Square Flange Linear Bearings — Precise Linear Motion for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your linear axis wobbles, binds, or wears out prematurely, the root cause is almost always an undersized or mismatched bearing. Engineers, CNC builders, and robotics makers who demand repeatable, low-friction travel need a bearing that mounts rigidly and stays aligned under load — that's exactly what the LMKP square flange linear bearing series is designed to deliver.\u003c\/p\u003e\n\u003cp\u003eEach LMKP linear bearing features a hardened steel outer shell with a square bolt-flange mounting plate, chrome steel ball complement, and a polymer ball retainer for smooth, quiet recirculation. Available in two body lengths: standard UU (closed both ends) and extended LUU for longer stroke support. The series spans inner diameters from 6 mm (0.24 in) to 60 mm (2.36 in), with outer diameters from 12 mm (0.47 in) to 90 mm (3.54 in) and body lengths from 19 mm (0.75 in) to 192 mm (7.56 in).\u003c\/p\u003e\n\u003cp\u003eTypical applications include LMKP square flange linear bearings for CNC router Z-axis carriages, LMKP linear motion bearings for 3D printer gantry systems, and LMKP guide bearings for industrial pick-and-place automation and laser cutting machines.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for use with standard smooth round linear shafts (6 mm – 60 mm diameter). Compatible with LM, LME, and LMKP-series shaft supports and pillow blocks. Verify shaft diameter and housing bore before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These LMKP Square Flange Linear Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSquare Flange Mounting Plate\u003c\/strong\u003e — Four-bolt square flange enables rigid, vibration-resistant mounting to flat surfaces, frames, and extrusions without additional brackets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eUU \u0026amp; LUU Body Options\u003c\/strong\u003e — Standard UU (closed both ends) for compact installations; extended LUU body for longer contact length, higher load capacity, and improved shaft guidance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cstrong\u003eChrome Steel Ball Complement\u003c\/strong\u003e — Hardened chrome steel (GCr15) balls provide low rolling resistance and consistent recirculating motion across the full stroke range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eDual-Lip Rubber Seals\u003c\/strong\u003e — UU-type seals on both ends retain grease and exclude dust, extending service life in workshop and light-industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Range: ID 6–60 mm\u003c\/strong\u003e — 25 model variants from LMKP6UU to LMKP60LUU cover the most common shaft diameters used in CNC, robotics, and automation builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Geometry\u003c\/strong\u003e — Outer dimensions conform to ISO\/JIS LMK-series standards, making these a direct replacement for worn or undersized bearings in existing linear systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — LMKP Square Flange Linear Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eLMKP (Square Flange, UU \u0026amp; LUU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e6 mm – 60 mm (0.24 in – 2.36 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e12 mm – 90 mm (0.47 in – 3.54 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Length\u003c\/th\u003e\n\u003ctd\u003e19 mm – 192 mm (0.75 in – 7.56 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Type\u003c\/th\u003e\n\u003ctd\u003eSquare, 4-bolt pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeal Type\u003c\/th\u003e\n\u003ctd\u003eDual-lip rubber (UU \/ LUU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Material\u003c\/th\u003e\n\u003ctd\u003eChrome steel (GCr15)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Shell Material\u003c\/th\u003e\n\u003ctd\u003eCarbon steel, hardened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRetainer Material\u003c\/th\u003e\n\u003ctd\u003ePolymer (nylon-type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eGrease pre-lubricated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Compatibility\u003c\/th\u003e\n\u003ctd\u003eStandard smooth round linear shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBolt Circle \/ Flange Dimensions\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Load Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStatic Load Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003e–20°C to +80°C (–4°F to +176°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose between the UU and LUU versions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe UU (standard) body is the right choice for compact axis designs where space is limited. The LUU (long) body provides a longer ball contact zone, which increases load capacity and improves shaft guidance — ideal for cantilevered loads, longer strokes, or applications where shaft deflection is a concern. If in doubt, the LUU version offers more stability at a modest size increase.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat shaft diameter do I need to match my bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe shaft diameter must match the bearing's inner diameter (ID) exactly. For example, an LMKP12UU requires a 12 mm diameter smooth linear shaft. Using an undersized shaft will cause play and premature wear; an oversized shaft will not fit. Always verify your shaft OD with a micrometer before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings compatible with standard LM \/ LMK series housings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The LMKP series follows ISO\/JIS LMK-series outer dimensions, so these bearings are dimensionally compatible with standard LMK square flange housings and pillow blocks. Always cross-reference the outer diameter and flange bolt pattern of your existing housing before installing.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these bearings — can they handle side loads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLMKP linear bearings are designed primarily for axial (along-shaft) linear motion with radial loads applied perpendicular to the shaft. They are not intended for pure thrust or heavy side-impact loads. For applications with significant side loads, use two bearings spaced apart along the shaft to distribute the moment load, or consider a supported rail system.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these bearings resist corrosion? Can I use them in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe outer shell and balls are carbon\/chrome steel, which offers moderate corrosion resistance when properly greased. The dual-lip rubber seals help retain lubricant and exclude moisture. For consistently wet or corrosive environments, we recommend applying a compatible bearing grease regularly and considering stainless-shaft pairings. These bearings are not rated for full submersion or highly corrosive chemical exposure.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install an LMKP square flange linear bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSlide the bearing onto the linear shaft from one end — never press or hammer directly on the seal faces. Align the square flange with your mounting surface and secure with four bolts tightened evenly in a cross pattern to avoid distorting the housing. Ensure the shaft is clean, lightly oiled, and free of burrs before installation. Apply a small amount of compatible grease to the shaft if the bearing is not pre-lubricated for your application.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between LMKP and LMK bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLMK refers to the square flange linear bearing housing\/block, while LMKP designates the specific bearing insert with a square flange integrated into the bearing body itself. LMKP bearings are self-contained units — the flange is part of the bearing — making them easier to install directly without a separate housing. Both follow the same outer dimension standards.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Model and Size above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between the UU and LUU versions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The UU (standard) body is the right choice for compact axis designs where space is limited. The LUU (long) body provides a longer ball contact zone, which increases load capacity and improves shaft guidance — ideal for cantilevered loads, longer strokes, or applications where shaft deflection is a concern.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What shaft diameter do I need to match my bearing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The shaft diameter must match the bearing's inner diameter (ID) exactly. For example, an LMKP12UU requires a 12 mm diameter smooth linear shaft. Always verify your shaft OD with a micrometer before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bearings compatible with standard LM \/ LMK series housings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The LMKP series follows ISO\/JIS LMK-series outer dimensions, so these bearings are dimensionally compatible with standard LMK square flange housings and pillow blocks.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these bearings — can they handle side loads?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LMKP linear bearings are designed primarily for axial linear motion with radial loads. They are not intended for pure thrust or heavy side-impact loads. Use two bearings spaced apart to distribute moment loads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these bearings resist corrosion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The outer shell and balls are carbon\/chrome steel with moderate corrosion resistance when properly greased. Dual-lip rubber seals help retain lubricant and exclude moisture. Not rated for full submersion or highly corrosive environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install an LMKP square flange linear bearing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slide the bearing onto the linear shaft from one end — never press directly on the seal faces. Align the square flange and secure with four bolts tightened evenly in a cross pattern. Ensure the shaft is clean and lightly oiled before installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between LMKP and LMK bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LMK refers to the square flange housing\/block, while LMKP designates the bearing insert with an integrated square flange. LMKP bearings are self-contained units that install directly without a separate housing.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"LMKP6UU \/ 6x12x19","offer_id":52448898056466,"sku":"WXB074357x1","price":11.83,"currency_code":"USD","in_stock":true},{"title":"LMKP8UU \/ 8x15x24","offer_id":52448898089234,"sku":"WXB074358x1","price":11.83,"currency_code":"USD","in_stock":true},{"title":"LMKP10UU \/ 10x19x29","offer_id":52448898122002,"sku":"WXB074359x1","price":14.28,"currency_code":"USD","in_stock":true},{"title":"LMKP12UU \/ 12x21x30","offer_id":52448898154770,"sku":"WXB074360x1","price":14.66,"currency_code":"USD","in_stock":true},{"title":"LMKP13UU \/ 13x23x32","offer_id":52448898187538,"sku":"WXB074361x1","price":16.56,"currency_code":"USD","in_stock":true},{"title":"LMKP16UU \/ 16x28x37","offer_id":52448898220306,"sku":"WXB074362x1","price":19.18,"currency_code":"USD","in_stock":true},{"title":"LMKP20UU \/ 20x32x42","offer_id":52448898253074,"sku":"WXB074363x1","price":24.45,"currency_code":"USD","in_stock":true},{"title":"LMKP25UU \/ 25x40x59","offer_id":52448898285842,"sku":"WXB074364x1","price":40.39,"currency_code":"USD","in_stock":true},{"title":"LMKP30UU \/ 30x45x64","offer_id":52448898318610,"sku":"WXB074365x1","price":48.66,"currency_code":"USD","in_stock":true},{"title":"LMKP35UU \/ 35x52x70","offer_id":52448898351378,"sku":"WXB074366x1","price":73.14,"currency_code":"USD","in_stock":true},{"title":"LMKP40UU \/ 40x60x80","offer_id":52448898384146,"sku":"WXB074367x1","price":107.3,"currency_code":"USD","in_stock":true},{"title":"LMKP50UU \/ 50x80x100","offer_id":52448898416914,"sku":"WXB074368x1","price":249.12,"currency_code":"USD","in_stock":true},{"title":"LMKP60UU \/ 60x90x110","offer_id":52448898449682,"sku":"WXB074369x1","price":328.71,"currency_code":"USD","in_stock":true},{"title":"LMKP6LUU \/ 6x12x35","offer_id":52448898482450,"sku":"WXB074370x1","price":13.84,"currency_code":"USD","in_stock":true},{"title":"LMKP8LUU \/ 8x15x45","offer_id":52448898515218,"sku":"WXB074371x1","price":14.93,"currency_code":"USD","in_stock":true},{"title":"LMKP10LUU \/ 10x19x55","offer_id":52448898547986,"sku":"WXB074372x1","price":19.28,"currency_code":"USD","in_stock":true},{"title":"LMKP12LUU \/ 12x21x57","offer_id":52448898580754,"sku":"WXB074373x1","price":20.37,"currency_code":"USD","in_stock":true},{"title":"LMKP13LUU \/ 13x23x61","offer_id":52448898613522,"sku":"WXB074374x1","price":22.55,"currency_code":"USD","in_stock":true},{"title":"LMKP16LUU \/ 16x28x70","offer_id":52448898646290,"sku":"WXB074375x1","price":27.17,"currency_code":"USD","in_stock":true},{"title":"LMKP20LUU \/ 20x32x80","offer_id":52448898679058,"sku":"WXB074376x1","price":33.7,"currency_code":"USD","in_stock":true},{"title":"LMKP25LUU \/ 25x40x112","offer_id":52448898711826,"sku":"WXB074377x1","price":63.78,"currency_code":"USD","in_stock":true},{"title":"LMKP30LUU \/ 30x45x123","offer_id":52448898744594,"sku":"WXB074378x1","price":75.32,"currency_code":"USD","in_stock":true},{"title":"LMKP35LUU \/ 35x52x135","offer_id":52448898777362,"sku":"WXB074379x1","price":115.57,"currency_code":"USD","in_stock":true},{"title":"LMKP40LUU \/ 40x60x151","offer_id":52448898810130,"sku":"WXB074380x1","price":164.8,"currency_code":"USD","in_stock":true},{"title":"LMKP50LUU \/ 50x80x192","offer_id":52448898842898,"sku":"WXB074381x1","price":405.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_dbdf53a6-5812-4266-9d25-7e97986d835e.jpg?v=1783686734","url":"https:\/\/homediyer.com\/products\/lmkp-square-flange-linear-bearings-uu-luu","provider":"HomeDIYer","version":"1.0","type":"link"}