PrecisionGeek® M4 Knurled Thumb Screws Stainless Steel 303, CNC Machined Hand Tightening Fasteners for Metal, Wood, Acrylic and Electronics (Flat – 15 mm – 5 pcs)

• 📐 M4 KNURLED THUMB SCREWS — STAINLESS STEEL 303, FLAT OR SHOULDER HEAD — Thread M4, available in 10mm and 15mm lengths. Knurled head precision-cut for secure finger grip enabling fast hand-tightening and removal without tools. Choose Flat Head for a flush, low-profile finish or Shoulder Head for a raised grip with collar. Available in 5 or 10 piece packs.
• 🏭 CNC MACHINED FROM SOLID STAINLESS STEEL AISI 303 — MADE IN THE EU — Every screw is precision-turned from solid stainless steel 303 bar stock in our European workshop. Stainless steel delivers superior corrosion resistance, strength and longevity compared to aluminium or zinc alternatives. No coatings, no plating — solid stainless throughout.
• 🔧 IDEAL FOR METAL, WOOD, ACRYLIC AND ELECTRONICS APPLICATIONS — Designed for repeated tool-free access in professional and hobby environments: electronics enclosures, acrylic panels, instrument cases, RC models, custom metalwork, woodworking jigs, laboratory equipment and any project using standard M4 threaded inserts or tapped holes.
• ✴️ TWO HEAD STYLES FOR DIFFERENT APPLICATIONS — Flat Head sits flush against the surface for a clean, unobtrusive finish ideal for tight spaces and panel mounting. Shoulder Head features a raised collar that lifts the knurled grip away from the surface, making it easier to grasp in recessed or countersunk applications. Select your preferred style from the variant menu.
• ⚙️ HAND TIGHTEN IN SECONDS — COMPATIBLE WITH ALL STANDARD M4 FIXINGS — Wide knurled head delivers firm, rattle-free clamping force by hand. Fully compatible with standard M4 nuts, brass threaded inserts, stainless steel inserts and tapped aluminium, steel or acrylic. No tools required for installation or removal.
• 🛡️ CORROSION RESISTANT — SUITABLE FOR INDOOR AND OUTDOOR USE — Stainless Steel 303 offers excellent resistance to moisture, humidity and mild chemicals. Unlike anodised aluminium or zinc-plated steel, these screws will not corrode, discolour or degrade in damp environments. Suitable for marine-adjacent, outdoor and high-humidity applications.
• ✅ PRECISIONGEEK — REGISTERED EU BRAND, CONSISTENT QUALITY — PrecisionGeek specialises in CNC machined stainless steel, aluminium and brass components. Every batch is inspected for thread quality and dimensional accuracy before dispatch. What you see in the listing is exactly what you receive. Designed and machined in Europe.
• 📦 AVAILABLE IN 5 OR 10 PIECE PACKS — SELECT SIZE, STYLE AND QUANTITY — Choose your preferred thread length, head style and pack size from the variant selector above. Supplied in a resealable pack, ready to use straight from the box. Compatible with all standard M4 threaded holes, nuts and inserts.

The knurled screws are also called knurled and set screws. This is a special type of screw that can be operated by hand. The ribbed edge prevents fingers from slipping when screwing in and out. No additional tools are required to attach/loosen the thumb screw. Areas of application: the thumb screws can be used individually. They are particularly convincing with connections that need to be loosened frequently. Areas of application include the following areas: household appliances, furniture construction, mechanical engineering, industrial and underwater technology, precision mechanics and test equipment. You will receive only first-class professional quality with metric standard thread.