{"product_id":"sewing-machine-upper-lower-knife-kit-tf123-tf122-singer-14n654-brother-3034d","title":"Sewing Machine Knife Kit TF123\/TF122 for Singer 14N654 \u0026 Brother","description":"\n\u003ch2\u003eSewing Machine Upper \u0026amp; Lower Knife Kit TF123\/TF122\u003c\/h2\u003e\n\u003cp\u003eKeep your serger running at peak performance with this replacement upper and lower knife kit (TF123\/TF122). Designed for popular home sewing and overlock machines including the \u003cstrong\u003eSinger 14N654\u003c\/strong\u003e and \u003cstrong\u003eBrother 3034D\u003c\/strong\u003e, this kit gives you everything you need to restore crisp, clean fabric cutting in one convenient package. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose This Knife Kit?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e Fits Singer 14N654, Brother 3034D, and other models that use TF123\/TF122 blade specifications — no guesswork required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes both the upper knife (TF123) and lower knife (TF122) so you can replace both blades at once for balanced, even cutting performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Crafted from sturdy, long-lasting materials that stay sharp through extended use, ensuring smooth and consistent fabric trimming stitch after stitch.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Designed for a straightforward swap — even beginner sewists can replace the blades quickly and confidently, getting the machine back in action fast.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat Value:\u003c\/strong\u003e Buying both blades together in one kit is far more cost-effective than sourcing each part separately, making this an smart investment for any home sewing setup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKit Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Upper Knife (TF123)\u003c\/li\u003e\n  \u003cli\u003e1× Lower Knife (TF122)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Models (includes but not limited to)\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSinger 14N654\u003c\/li\u003e\n  \u003cli\u003eBrother 3034D\u003c\/li\u003e\n  \u003cli\u003eOther domestic overlock\/serger machines using TF123\/TF122 blades\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e HELTC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Upper \u0026amp; Lower Replacement Knife Set\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Use:\u003c\/strong\u003e Embroidery, overlocking, serging, general sewing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eExplore More Sewing \u0026amp; Craft Supplies\u003c\/h3\u003e\n\u003cp\u003eLooking for more tools and accessories for your creative projects? Browse our related products:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-art-print\"\u003e\"1% Better Every Day\" Motivational Canvas Wall Art Print\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/everything-is-figureoutable-sage-green-quote-canvas-wall-art\"\u003e\"Everything Is Figureoutable\" Sage Green Quote Canvas Wall Art\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more guidance on safe use of cutting tools and sewing accessories, visit the U.S. Consumer Product Safety Commission (CPSC) for general product safety information.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Notions_%28sewing%29\" target=\"_blank\" rel=\"noopener\"\u003eNotions (sewing)\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which sewing machine models is this upper and lower knife kit compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This TF123\/TF122 knife kit is specifically designed for the Singer 14N654 and Brother 3034D serger\/overlock machines. It may also be compatible with other domestic overlock machines that use TF123 upper and TF122 lower blade specifications — check your machine's manual to confirm blade model numbers before ordering.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this knife kit easy to install at home without professional help?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! This kit is designed for straightforward at-home installation. The replacement blades are engineered to fit precisely, and most users — including beginners — can complete the swap quickly using basic tools. Always refer to your sewing machine's manual for step-by-step blade replacement guidance.\u003c\/p\u003e\n\u003ch4\u003eQ: How often should I replace the upper and lower knives on my serger?\u003c\/h4\u003e\n\u003cp\u003eA: Blade replacement frequency depends on usage intensity and the types of fabric you sew. As a general rule, if you notice the fabric edges becoming ragged, frayed, or unevenly trimmed, it's time to replace the blades. Having a spare TF123\/TF122 kit on hand ensures you're never caught mid-project with dull blades.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which sewing machine models is this upper and lower knife kit compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This TF123\/TF122 knife kit is specifically designed for the Singer 14N654 and Brother 3034D serger\/overlock machines. It may also be compatible with other domestic overlock machines that use TF123 upper and TF122 lower blade specifications — check your machine's manual to confirm blade model numbers before ordering.\"}}, {\"@type\": \"Question\", \"name\": \"Is this knife kit easy to install at home without professional help?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! This kit is designed for straightforward at-home installation. The replacement blades are engineered to fit precisely, and most users — including beginners — can complete the swap quickly using basic tools. Always refer to your sewing machine's manual for step-by-step blade replacement guidance.\"}}, {\"@type\": \"Question\", \"name\": \"How often should I replace the upper and lower knives on my serger?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Blade replacement frequency depends on usage intensity and the types of fabric you sew. As a general rule, if you notice the fabric edges becoming ragged, frayed, or unevenly trimmed, it's time to replace the blades. Having a spare TF123\/TF122 kit on hand ensures you're never caught mid-project with dull blades.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Sewing \u0026 Textile\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/collections\/sewing-textile\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Sewing Machine Knife Kit TF123\/TF122 for Singer 14N654 \u0026 Brother\", \"item\": \"https:\/\/vd0uzy-jp.myshopify.com\/products\/sewing-machine-upper-lower-knife-kit-tf123-tf122-singer-14n654-brother-3034d\"}]}\u003c\/script\u003e","brand":"Peaceful Pleasures Health and Wellness","offers":[{"title":"Default Title","offer_id":53668338729273,"sku":"1005011975983812-Default Title","price":10.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/3689\/5801\/files\/S15a4235f8fa4412b8a12317b4def34d68.webp?v=1783037554","url":"https:\/\/peacefulpleasureswellness.com\/products\/sewing-machine-upper-lower-knife-kit-tf123-tf122-singer-14n654-brother-3034d","provider":"Peaceful Pleasures Health and Wellness","version":"1.0","type":"link"}