{"title":"Brass Heat-Set Inserts for Plastic - M3 x 4mm - 50 pack","handle":"brass-heat-set-inserts-for-plastic-m3-x-4mm-50-pack","url":"/products/brass-heat-set-inserts-for-plastic-m3-x-4mm-50-pack","description":"Brass heat-set inserts provide strong, reusable threaded connections in 3D-printed and injection-moulded plastic parts. Each insert has a knurled outer surface that grips the surrounding plastic when pressed in with a heated soldering iron, and an M3 internal thread that accepts standard machine screws.\n\nUsing heat-set inserts instead of screwing directly into plastic gives a much stronger joint that can be assembled and disassembled repeatedly without stripping. They're an inexpensive way to add professional-quality fastening points to your enclosures, brackets, and housings.\n\nKey Features\n\n\nM3 Internal Thread – Accepts standard M3 machine screws\n\nKnurled Outer Surface – Grips plastic securely when heat-pressed\n\nBrass Construction – Durable, corrosion-resistant, and reusable\n\n4 mm Length – Suitable for typical 3D-printed wall thicknesses\n\n50-Pack – Enough for multiple projects\n\n\nSpecifications\n\n\nThread – M3\n\nLength – 4 mm\n\nMaterial – Brass\n\nQuantity – 50 pieces\n\n\nIdeal For\n\n3D-printed enclosures, brackets, and housings\nInjection-moulded plastic assemblies\nAny project requiring reusable threaded fastening in plastic\n\n\n\nTip: Use a dedicated heat-set insert tip on your soldering iron for best results. A plain iron tip can work but makes it difficult to insert straight, risking damage to your print.\n\n\nPackage Contents\n\n50× Brass Heat-Set Inserts (M3 × 4 mm)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":5190,"title":"Default Title","sku":"AF-4255","price":12.88,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":102,"option1":"Default Title"}]}