{"product_id":"knurled-plastic-adjustment-knobs-m3-m8-brass-nut-insert-5pcs","title":"5pcs Knurled Plastic Adjustment Knobs M3–M8 with Brass Nut Insert","description":"\u003ch2\u003e5-Pack Knurled Hand-Tightening Knobs with Embedded Brass Nut\u003c\/h2\u003e\n\u003cp\u003eUpgrade your DIY builds, machinery, and equipment with these premium \u003cstrong\u003eknurled plastic adjustment knobs\u003c\/strong\u003e. Available in M3, M4, M5, M6, and M8 thread sizes, each knob features an embedded brass nut insert — available in both \u003cstrong\u003eblind hole\u003c\/strong\u003e and \u003cstrong\u003ethrough-hole\u003c\/strong\u003e configurations — for a secure, rattle-free fit. The textured knurled surface gives you confident tool-free hand-tightening every time.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China. CE certified.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5-piece set\u003c\/strong\u003e — one knob per size: M3, M4, M5, M6, and M8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEmbedded brass nut insert\u003c\/strong\u003e — provides strong, corrosion-resistant threading\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlind hole \u0026amp; through-hole types\u003c\/strong\u003e — versatile for many applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnurled grip surface\u003c\/strong\u003e — easy hand-tightening without tools\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable plastic body\u003c\/strong\u003e (Bakelite\/Thermoplastic) — lightweight yet sturdy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE Certified\u003c\/strong\u003e — meets quality and safety standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSize Guide\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background:#f2f2f2;\"\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eThread Size\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eKnob Diameter\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM3\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM4\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM5\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e15 mm \/ 22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM6\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e18 mm \/ 22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM8\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e25 mm \/ 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM10\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e30 mm \/ 40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM12\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e3D printers, CNC machines, and laser cutters\u003c\/li\u003e\n  \u003cli\u003eElectronic enclosures and control panels\u003c\/li\u003e\n  \u003cli\u003eWoodworking jigs, fixtures, and clamps\u003c\/li\u003e\n  \u003cli\u003eDIY robotics and automation projects\u003c\/li\u003e\n  \u003cli\u003eFurniture assembly and equipment adjustment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cp\u003eLooking for more hardware and fastening solutions? Check out these items from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/stainless-steel-self-tapping-screws-m2-2-m4-8-phillips-wood-hinge\"\u003e10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-2-pin-quick-splice-spring-wire-connectors-lock-terminals\"\u003e10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-durable-gold-blade-nut-metal-universal-trimmer-accessories-anti-loosening-line-left-hand-thread-replacement-parts-1\"\u003e10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between blind hole and through-hole knurled knobs?\u003c\/h4\u003e\n\u003cp\u003eA: A \u003cstrong\u003eblind hole knob\u003c\/strong\u003e has a threaded insert that does not pass all the way through — ideal for mounting onto a bolt or stud with a fixed length. A \u003cstrong\u003ethrough-hole knob\u003c\/strong\u003e has an open channel running the full length of the insert, allowing a longer bolt or threaded rod to pass completely through, giving you more flexibility in installation depth.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these knobs suitable for outdoor or high-moisture environments?\u003c\/h4\u003e\n\u003cp\u003eA: The plastic body is resistant to everyday moisture, and the embedded brass nut provides good corrosion resistance compared to standard steel inserts. For long-term outdoor or high-humidity applications, we recommend applying a light protective coating to the brass nut area for added durability.\u003c\/p\u003e\n\u003ch4\u003eQ: What thread pitch do these M3–M8 adjustment knobs use?\u003c\/h4\u003e\n\u003cp\u003eA: These knurled knobs follow standard metric coarse thread pitches — M3 (0.5 mm), M4 (0.7 mm), M5 (0.8 mm), M6 (1.0 mm), and M8 (1.25 mm) — compatible with the vast majority of metric fasteners and hardware used in DIY, electronics, and machining projects.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I customize the size or color of these knobs?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — according to the product specifications, customization is available. Please contact our store with your requirements for thread size, diameter, hole type, or color and we will be happy to assist.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between blind hole and through-hole knurled knobs?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A blind hole knob has a threaded insert that does not pass all the way through — ideal for mounting onto a bolt or stud with a fixed length. 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