{"product_id":"m4-truss-head-self-tapping-kit-a2-a4-stainless","title":"M4 Phillips Truss Head Self Tapping Screw Kit – A2 \u0026 A4 Stainless Steel","description":"\u003cdiv class=\"hdiy-product-detail\"\u003e\n\u003c!-- Product Overview --\u003e\n\u003cdiv class=\"hdiy-section\"\u003e\n\u003ch2 class=\"hdiy-heading\"\u003e🔩 Truss Head Self‑Tapping Screw Kit – A2 \/ A4 Stainless Steel, Multiple Sizes \u0026amp; Kits\u003c\/h2\u003e\n\u003cp class=\"hdiy-text\"\u003eWhether you’re working on metal sheeting, outdoor brackets, or marine‑grade fittings, these truss head self‑tapping screw kits give you the exact sizes and the lasting corrosion protection you need. Each screw features a wide, low‑profile truss head that spreads clamping force to stop pull‑through in thin sheet metal, plastic, and wood. You can choose between A2 (304) stainless steel for excellent everyday weather resistance, or A4 (316) stainless steel – enhanced with molybdenum – for unbeatable performance in saltwater, chemical, and extreme outdoor environments. The kits include a range of lengths across popular M3, M4, and M5 diameters, along with a free screwdriver and screw plugs to get you started right away. Phillips drive gives a secure, cam‑out‑resistant grip, and the sharp self‑tapping thread cuts its own tight mate without a pilot hole in most materials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Key Features – vertical list for SEO --\u003e\n\u003cdiv class=\"hdiy-section\"\u003e\n\u003ch2 class=\"hdiy-heading\"\u003e⚙️ Key Features – Truss Head Self‑Tapping Screw Kits\u003c\/h2\u003e\n\u003cul class=\"hdiy-feature-list\"\u003e\n\u003cli\u003eWide truss head spreads load and prevents pull‑through in sheet metal, plastic, and wood\u003c\/li\u003e\n\u003cli\u003eMaterial choice: A2 (304) stainless steel for excellent outdoor corrosion resistance, or A4 (316) stainless steel for ultimate saltwater and chemical protection\u003c\/li\u003e\n\u003cli\u003eSelf‑tapping thread cuts directly into metal, wood, and composites – no pre‑tap required\u003c\/li\u003e\n\u003cli\u003ePhillips drive for stable, slip‑resistant fastening\u003c\/li\u003e\n\u003cli\u003eKits available: M3\/M4\/M5 Mixed A2, M4 A2, or M4 A4 – each with a selection of practical lengths\u003c\/li\u003e\n\u003cli\u003eEach kit includes a free screwdriver and screw plugs for immediate installation\u003c\/li\u003e\n\u003cli\u003eSmooth, burr‑free threads ensure consistent holding power and easy starting\u003c\/li\u003e\n\u003cli\u003eIdeal for metal roofing, automotive trim, marine hardware, furniture, and general outdoor construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- Kit Contents – Table --\u003e\n\u003cdiv class=\"hdiy-section\"\u003e\n\u003ch2 class=\"hdiy-heading\"\u003e📋 Kit Options \u0026amp; Contents – Truss Head Self‑Tapping Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eKit\u003c\/th\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003cth\u003eScrew Sizes (Diameter × Length)\u003c\/th\u003e\n\u003cth\u003eScrew Plugs\u003c\/th\u003e\n\u003cth\u003eFree Screwdriver\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\/M4\/M5 Mixed A2 Kit\u003c\/td\u003e\n\u003ctd\u003eA2 (304) Stainless Steel\u003c\/td\u003e\n\u003ctd\u003eM3×6 (10pcs), M3×10 (10pcs), M3×12 (10pcs), M3×16 (10pcs), M4×12 (10pcs), M4×16 (10pcs), M4×20 (10pcs), M4×30 (10pcs), M5×16 (10pcs), M5×20 (10pcs), M5×35 (10pcs)\u003c\/td\u003e\n\u003ctd\u003e20 pcs\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4 A2 Kit\u003c\/td\u003e\n\u003ctd\u003eA2 (304) Stainless Steel\u003c\/td\u003e\n\u003ctd\u003eM4×16 (15pcs), M4×20 (15pcs), M4×25 (15pcs), M4×30 (15pcs), M4×35 (15pcs), M4×40 (15pcs), M4×50 (15pcs)\u003c\/td\u003e\n\u003ctd\u003e10 pcs\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4 A4 Kit\u003c\/td\u003e\n\u003ctd\u003eA4 (316) Stainless Steel\u003c\/td\u003e\n\u003ctd\u003eM4×16 (15pcs), M4×20 (15pcs), M4×25 (15pcs), M4×30 (15pcs), M4×35 (15pcs), M4×40 (15pcs), M4×50 (15pcs)\u003c\/td\u003e\n\u003ctd\u003e10 pcs\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"hdiy-note\"\u003eHead dimensions for each size are shown in the product images. Length is measured from under the head. Select your preferred kit from the listing options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- FAQ – fully expanded --\u003e\n\u003cdiv class=\"hdiy-section\"\u003e\n\u003ch2 class=\"hdiy-heading\"\u003e❓ Frequently Asked Questions – Truss Head Self‑Tapping Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003ch3 class=\"hdiy-faq-question\"\u003e🔸 What’s the difference between A2 and A4 stainless steel?\u003c\/h3\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eA2 (304) stainless is the standard for outdoor, humid, and mildly corrosive environments. It resists red rust effectively. A4 (316) stainless contains extra molybdenum, giving it far superior protection against saltwater, chlorides, and chemical attack. Choose A4 for boat hardware, coastal structures, or chemical plants; A2 is perfect for general roofing, cladding, and damp‑location use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003ch3 class=\"hdiy-faq-question\"\u003e🔸 Do I need a pilot hole before driving these screws?\u003c\/h3\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eIn thin sheet metal (up to 1.5 mm), soft plastics, and wood, you can usually drive directly. For thicker steel or very hard materials, a pilot hole about 80% of the thread diameter reduces driving torque and ensures the cleanest thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003ch3 class=\"hdiy-faq-question\"\u003e🔸 How does the truss head help compared to a standard pan head?\u003c\/h3\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eThe truss head has a wider, flatter bearing surface that spreads the clamping pressure over a larger area. This stops the screw from pulling through thin or soft materials and often eliminates the need for a separate washer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003ch3 class=\"hdiy-faq-question\"\u003e🔸 What Phillips bit size should I use for these screws?\u003c\/h3\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eIt depends on the screw diameter: M3 and M3.5 use a #1 Phillips bit, while M4, M5, and M6 use a #2 Phillip bit. A sharp, unworn bit prevents cam‑out and keeps the head recess in good shape.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Styles – .hdiy- prefix prevents theme conflicts --\u003e\n\u003cstyle\u003e\n  .hdiy-product-detail, .hdiy-product-detail * {\n    box-sizing: border-box;\n    margin: 0;\n    padding: 0;\n  }\n  .hdiy-product-detail {\n    width: 100%;\n    max-width: 100%;\n    color: #1a1a1a;\n    line-height: 1.5;\n    word-wrap: break-word;\n    overflow-wrap: break-word;\n    background: #fff;\n    padding: 0 0 20px 0;\n  }\n  .hdiy-section {\n    margin-bottom: 28px;\n  }\n  .hdiy-heading {\n    font-size: 1.35em;\n    font-weight: 600;\n    line-height: 1.3;\n    margin-bottom: 14px;\n    color: #222;\n    border-bottom: 2px solid #e0e0e0;\n    padding-bottom: 8px;\n  }\n  .hdiy-text {\n    font-size: 0.95em;\n    margin-bottom: 12px;\n    color: #333;\n  }\n  .hdiy-feature-list {\n    list-style: none;\n    padding-left: 0;\n    margin: 0;\n  }\n  .hdiy-feature-list li {\n    position: relative;\n    padding-left: 24px;\n    margin-bottom: 10px;\n    font-size: 0.95em;\n    color: #2d2d2d;\n  }\n  .hdiy-feature-list li::before {\n    content: \"▪\";\n    position: absolute;\n    left: 0;\n    color: #b8860b;\n    font-weight: bold;\n  }\n  .hdiy-table-wrapper {\n    width: 100%;\n    overflow-x: auto;\n    -webkit-overflow-scrolling: touch;\n    margin-bottom: 6px;\n    border: 1px solid #ddd;\n    border-radius: 4px;\n  }\n  .hdiy-table {\n    width: 100%;\n    border-collapse: collapse;\n    min-width: 750px;\n    font-size: 0.9em;\n    background: #fff;\n  }\n  .hdiy-table th,\n  .hdiy-table td {\n    border: 1px solid #ddd;\n    padding: 10px 8px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-table thead th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n    color: #222;\n  }\n  .hdiy-table tbody tr:nth-child(even) {\n    background-color: #fafafa;\n  }\n  .hdiy-note {\n    font-size: 0.85em;\n    color: #666;\n    margin-top: 6px;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 22px;\n  }\n  .hdiy-faq-question {\n    font-size: 1.0em;\n    font-weight: 600;\n    margin-bottom: 6px;\n    color: #1a1a1a;\n  }\n  .hdiy-faq-answer {\n    font-size: 0.9em;\n    color: #444;\n    margin-left: 0;\n    padding-left: 12px;\n    border-left: 3px solid #ccc;\n  }\n  @media screen and (max-width: 600px) {\n    .hdiy-heading {\n      font-size: 1.2em;\n    }\n    .hdiy-table th,\n    .hdiy-table td {\n      padding: 8px 6px;\n      font-size: 0.82em;\n    }\n    .hdiy-feature-list li {\n      font-size: 0.9em;\n    }\n    .hdiy-faq-question {\n      font-size: 0.95em;\n    }\n    .hdiy-faq-answer {\n      font-size: 0.85em;\n    }\n  }\n\u003c\/style\u003e","brand":"HomeDIYer","offers":[{"title":"Kit - M3 M4 M5 (A2 Stainless) \/ 1","offer_id":52248121016594,"sku":"GLFBDMHBRTQJD005933x1","price":33.27,"currency_code":"USD","in_stock":true},{"title":"Kit - M4 (A2 Stainless) \/ 1","offer_id":52248121049362,"sku":"GLFBDMHBRTQJD005934x1","price":46.59,"currency_code":"USD","in_stock":true},{"title":"Kit - M4 (A4 Stainless) \/ 1","offer_id":52248121082130,"sku":"GLFBDMHBRTQJD005935x1","price":77.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_b082965c-81a4-4513-84dd-2c9da8152480.jpg?v=1778492042","url":"https:\/\/homediyer.com\/products\/m4-truss-head-self-tapping-kit-a2-a4-stainless","provider":"HomeDIYer","version":"1.0","type":"link"}