{"product_id":"m3-button-head-screws-304-stainless","title":"M3 Button Head Hex Socket Screws - 304 Stainless Steel, M3x4 or M3x6","description":"\u003cdiv class=\"nznpd\"\u003e\n\u003cdiv class=\"nznpd__lead\"\u003e\n\u003cp class=\"nznpd__intro\"\u003eA button head screw has a low, rounded head with a hex socket in the top. It sits lower and looks tidier than a standard cap screw, which suits lids and covers that stay on show. These are M3 screws in 304 stainless steel, sold per screw in two lengths, M3x4 and M3x6.\u003c\/p\u003e\n\u003cp class=\"nznpd__intro\"\u003eYou can use them to screw a board down onto M3 standoffs, or to close a 3D printed case that has \u003ca href=\"\/products\/m3-brass-heat-set-insert-3d-printing-5mm\"\u003eM3 heat-set inserts\u003c\/a\u003e. The length is the thread under the head, so M3x4 suits a board screwed straight into a standoff and M3x6 suits a board or thin panel with a nut on the back. 304 stainless copes with damp and outdoor use, so they suit a weatherproof box as well as an indoor build. For a dark finish there is also an \u003ca href=\"\/products\/m3x6-button-head-screws-black\"\u003eM3x6 in black alloy steel\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__specs\"\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eThread\u003c\/span\u003e\u003cstrong\u003eM3 x 0.5mm, standard metric\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eLength (under the head)\u003c\/span\u003e\u003cstrong\u003e4mm or 6mm\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eOverall length\u003c\/span\u003e\u003cstrong\u003eAbout 5.7mm or 7.7mm with the head\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eHead\u003c\/span\u003e\u003cstrong\u003eButton (low dome), hex socket\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eHead size\u003c\/span\u003e\u003cstrong\u003eAbout 5.7mm across, 1.65mm tall\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eHex key\u003c\/span\u003e\u003cstrong\u003e2mm (not included)\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eMaterial\u003c\/span\u003e\u003cstrong\u003e304 stainless steel\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eFinish\u003c\/span\u003e\u003cstrong\u003ePlain silver\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eMinimum order\u003c\/span\u003e\u003cstrong\u003e5 screws per length, priced per screw\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003cdiv class=\"nznpd__qs\"\u003e\n\u003ch3\u003eChoosing and fitting\u003c\/h3\u003e\n\u003col class=\"nznpd__steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eWork out the length\u003c\/strong\u003e\u003cp\u003eAdd up what the thread has to pass through. Through a 1.6mm PCB into a standoff, M3x4 leaves 2.4mm of thread in the standoff, about five turns. Through the same PCB with an \u003ca href=\"\/products\/metric-hex-nuts-m2-m3-m4-m5-stainless-steel\"\u003eM3 hex nut\u003c\/a\u003e on the back, use M3x6: the nut is 2.4mm thick, so about 2mm of thread shows past it.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eUse a 2mm hex key\u003c\/strong\u003e\u003cp\u003eButton heads take a 2mm hex key, one size down from the 2.5mm key an M3 cap screw takes. Push the key all the way into the socket and stop once the screw is snug. The socket is shallow, so a key that slips or a lot of force will round it out.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eInto plastic, fit an insert first\u003c\/strong\u003e\u003cp\u003eAn M3 thread cut straight into a 3D print holds at first, then wears loose after the screw has been in and out a few times. Fit an \u003ca href=\"\/products\/m3-brass-heat-set-insert-3d-printing-5mm\"\u003eM3 heat-set insert\u003c\/a\u003e and the screw goes into brass instead.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n","brand":"NZN Electronics","offers":[{"title":"M3 x 4mm","offer_id":67775418040416,"sku":"FST-BHCS-M3X4-SS304","price":0.25,"currency_code":"NZD","in_stock":true},{"title":"M3 x 6mm","offer_id":67775418073184,"sku":"FST-BHCS-M3X6-SS304","price":0.25,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/FST-BHCS-M3-SS304_01-hero_v1_transparent.png?v=1794537708","url":"https:\/\/www.nznelectronics.co.nz\/products\/m3-button-head-screws-304-stainless","provider":"NZN Electronics","version":"1.0","type":"link"}