{"product_id":"m2-m25-knurled-thumb-screws-303-stainless-steel","title":"M2 M2.5 Knurled Thumb Screws, 303 Stainless Steel Round Knob Hand-Tighten Bolts","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM2 \u0026amp; M2.5 Knurled Thumb Screws — Tool-Free Fastening for Electronics, RC \u0026amp; DIY Builds\u003c\/h2\u003e\n\u003cp\u003eIf you've ever stripped a tiny screw trying to open an electronics enclosure, or fumbled for a screwdriver just to swap an RC car body panel, you know how frustrating small fasteners can be. These M2 M2.5 knurled thumb screws are built for makers, hobbyists, and technicians who need fast, reliable, tool-free access — without sacrificing a secure hold.\u003c\/p\u003e\n\u003cp\u003eEach set includes your choice of M2 or M2.5 knurled thumb screws machined from 303 stainless steel, available in packs of 5, 10, or 20 pieces. Thread diameters are M2 (2mm) and M2.5 (2.5mm), with lengths ranging from 4mm (≈5\/32\") to 12mm (≈15\/32\"). The round knurled knob head provides a secure finger grip for hand-tightening without any tools.\u003c\/p\u003e\n\u003cp\u003eThese stainless steel thumb screws are a natural fit for 3D printer frame assemblies, RC car and drone body panels, electronics enclosure covers, laboratory instrument housings, and camera rig accessories — anywhere you need a hand-tighten bolt that can be removed and reinstalled quickly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Metric ISO thread standard. M2 pitch 0.4mm \/ M2.5 pitch 0.45mm. Fits standard M2 and M2.5 metric nuts, threaded inserts, and tapped holes. \u003cstrong\u003eNot compatible with imperial (UNC\/UNF) threads.\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These M2 M2.5 Knurled Thumb Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖐️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTool-Free Installation\u003c\/strong\u003e — The wide knurled round knob head is designed for finger-tightening, making these ideal for panels and covers that need frequent removal.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e303 Stainless Steel Construction\u003c\/strong\u003e — Machined from 303 stainless steel for solid corrosion resistance and durability in electronics, hobby, and light outdoor applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTwo Thread Sizes in One Listing\u003c\/strong\u003e — Available in both M2 and M2.5 diameters, covering the most common small-fastener sizes used in RC models, 3D printers, and instrument enclosures.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMultiple Length Options\u003c\/strong\u003e — Choose from lengths ranging from 4mm to 12mm to match your panel thickness, with no need to cut or modify the fastener.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eReusable \u0026amp; Repeatable\u003c\/strong\u003e — The stainless steel threads hold up to repeated installation and removal cycles without galling or deforming, unlike zinc or plastic alternatives.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Sizes\u003c\/strong\u003e — Available in 5, 10, or 20-piece packs so you can stock exactly what you need for a single build or a full workshop supply.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — M2 M2.5 Knurled Thumb Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e303 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound Knurled Knob (hand-tighten)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive — finger-tighten only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric ISO (M2 \/ M2.5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM2: 0.4mm | M2.5: 0.45mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM2 (2mm) and M2.5 (2.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e4mm (≈5\/32\"), 5mm (≈3\/16\"), 6mm (≈1\/4\"), 7.5mm (≈19\/64\"), 8mm (≈5\/16\"), 10mm (≈3\/8\"), 12mm (≈15\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e5 pcs, 10 pcs, 20 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKnob Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for indoor and light outdoor use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eNote:\u003c\/strong\u003e Knob outer diameter and exact head height are not listed above. If your application has tight clearance requirements, please contact us to confirm dimensions before ordering.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my thumb screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the total thickness of the material you need to clamp or fasten, then add 1–2 thread diameters for adequate engagement. For example, a 6mm (≈1\/4\") panel generally works well with an M2.5x8mm or M2.5x10mm screw. When in doubt, size up — you can always use a washer to take up extra thread length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these thumb screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e303 stainless steel thumb screws are generally rated for light-to-medium clamping loads. They are not intended for high-torque structural applications. For hand-tightened assemblies — such as electronics enclosures, RC car body panels, or instrument covers — the holding strength is typically sufficient. If you need higher clamping force, consider a tool-driven fastener instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these be used outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e303 stainless steel offers good corrosion resistance for most indoor and light outdoor use. It is generally suitable for occasional moisture exposure. For prolonged saltwater or marine environments, 316 stainless steel is typically recommended. These screws are well-suited for electronics enclosures, hobby projects, and light outdoor fixtures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these use — metric or imperial?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are metric fasteners following the ISO standard thread profile. M2 has a standard pitch of 0.4mm and M2.5 has a standard pitch of 0.45mm. They are \u003cstrong\u003enot compatible\u003c\/strong\u003e with UNC\/UNF imperial threads. Make sure your mating nut or threaded insert is also metric.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need any tools to install these thumb screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo tools are required. The knurled round knob head is designed for finger-tightening, making these ideal for panels and covers that need to be opened and closed frequently. If you need a more secure hold, a small wrench or pliers can be used carefully, though over-tightening is not recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are the most common uses for M2 and M2.5 thumb screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eM2 and M2.5 thumb screws are commonly used in electronics enclosures, RC car and drone body panels, 3D printer assemblies, camera equipment, laboratory instruments, and small appliance covers. Their small diameter and hand-tighten design make them a go-to fastener wherever tool-free access is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know if M2 or M2.5 is the right size for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCheck the thread diameter of your existing hole or nut. M2 has a 2mm thread diameter and M2.5 has a 2.5mm thread diameter. If you are tapping a new hole, M2.5 generally provides slightly more holding strength and is more forgiving in softer materials like aluminum or plastic.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003esize and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2.5x4mm \/ 5pcs","offer_id":52293125636370,"sku":"FXLJLWJ00192x5","price":2.3,"currency_code":"USD","in_stock":true},{"title":"M2.5x5mm \/ 5pcs","offer_id":52293125669138,"sku":"FXLJLWJ00193x5","price":2.3,"currency_code":"USD","in_stock":true},{"title":"M2.5x6mm \/ 5pcs","offer_id":52293125701906,"sku":"FXLJLWJ00194x5","price":2.38,"currency_code":"USD","in_stock":true},{"title":"M2.5x7.5mm \/ 5pcs","offer_id":52293125734674,"sku":"FXLJLWJ00195x5","price":2.38,"currency_code":"USD","in_stock":true},{"title":"M2.5x8mm \/ 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