Special Crazy Selling Plastic Cap Plug RPC-D16Best-selling round plastic cap plug RPC-D16 for round steel tubes and pipes. Available in 16mm to 100mm diameter. Competitive price, high quality.MaterialPP / PEFinishBlack (standard); White, Grey, Custom colors availableMOQ5,000 pcsKey FeaturesRibbed outer surface grips round tube inner wall firmlyPush-in design for easy tool-free installationAvailable in full diameter range from 16mm to 100mmPP/PE material is lightweight, durable, and corrosion-resistantFlat top provides clean, professional finish for round tube endsSuitable for furniture, railings, handrails, and structural tubesCustom colors and diameters available for OEM ordersCompetitive pricing for bulk orders – ideal for distributorsTechnical SpecificationsSpecificationValueItem No.RPC-D16 (series: RPC-D16 to RPC-D100)MaterialPP (Polypropylene) / PE (Polyethylene)ColorBlack (standard); White, Grey, Custom colors on requestTube Diameter16mm (also available: 19mm, 22mm, 25mm, 32mm, 38mm, 42mm, 48mm, 51mm, 60mm, 76mm, 89mm, 100mm)TypePush-in insert (internal fit for round tubes)Top StyleFlat topApplicationRound tube furniture, railings, handrails, playground equipment, structural tubesMOQ5,000 pcs per size/colorPackaging500–2,000 pcs per carton (size dependent)Product Description<p>The RPC-D16 is one of our best-selling round plastic cap plugs, designed to fit round steel tubes and pipes with a 16mm outer diameter. Made from high-quality PP or PE material, this round tube cap provides excellent protection for pipe ends while giving a clean, professional finish to round tube furniture, railings, and structural applications.</p> <p>The RPC-D16 features a push-in design that fits securely into the tube end without adhesive. The ribbed outer surface grips the inner wall of the tube firmly, preventing the cap from falling out during normal use. The flat top surface provides a smooth, finished appearance that is suitable for both functional and decorative applications.</p> <p>This round plastic cap is widely used in furniture manufacturing, railing systems, playground equipment, and general metalwork. Available in a full range of diameters from 16mm to 100mm to suit all standard round tube sizes. Custom colors and sizes are available for OEM/ODM orders with sufficient minimum order quantities.</p>FAQWhat diameter range is available for the RPC round plastic cap?The RPC series is available in diameters from 16mm to 100mm, including 19mm, 22mm, 25mm, 32mm, 38mm, 42mm, 48mm, 51mm, 60mm, 76mm, 89mm, and 100mm. Custom sizes are available upon request.Is this cap for the inside or outside of the tube?The RPC-D16 is an internal insert cap – it fits inside the round tube end. We also offer external caps that fit over the tube end if required.What material is used for the RPC plastic cap?Standard caps are made from PP (polypropylene) or PE (polyethylene). Both materials are lightweight, durable, and suitable for indoor and outdoor applications.Can I get custom colors for furniture matching?Yes. Custom colors are available for OEM orders with a minimum of 10,000 pcs per color. Standard black, white, and grey are available from stock.What is the minimum order quantity?The standard MOQ is 5,000 pcs per size and color. We can discuss smaller trial orders for new customers or distributors.Are these caps suitable for outdoor use?Yes. The PP/PE material is weather-resistant and suitable for outdoor applications such as railings, handrails, and playground equipment.Request a quote from HST