Product Overview
Our Industrial Nickel-Plated Brass Waterproof Stopping Plugs (Metal Screw Caps) provide a robust, leak-proof, and dust-tight closure for spare cable entry holes in electrical control panels, terminal boxes, and outdoor equipment. Precision-machined from solid nickel-plated brass (with stainless steel options available upon request), these round slotted caps allow quick installation and removal using a standard flathead screwdriver.
Equipped with a high-performance neoprene sealing O-ring featuring a V0 (UL94) flame rating, this plug reliably prevents water ingress under high-pressure jets and continuous submersion. Engineered for extreme climates, it withstands static temperatures from -60°C to +100°C (short-term up to 120°C) and resists acid, alkali, oil, and common industrial solvents. Fully compatible with Metric (M), PG, and G (PF) threads, it ensures long-term enclosure integrity and weather protection.
Key Features
-
IP66 / IP68 Ingress Protection: Fitted with a high-elasticity neoprene sealing ring to block high-pressure water jets, rain, moisture, and fine industrial dust.
-
Rugged Metallic Construction: Heavy-duty nickel-plated brass body offers exceptional mechanical strength, acid/alkali resistance, and long-term corrosion protection.
-
UL94-V0 Flame-Retardant Seal: Features a V0-rated halogen-free neoprene gasket for superior fire safety and high-temperature sealing stability.
-
Wide Temperature Resilience: Operates reliably in static environments from -60°C to +100°C (short-term spikes to 120°C) and dynamic conditions from -20°C to +80°C.
-
Easy Slotted Drive Installation: Round head profile includes a deep flathead slot for effortless tightening with a standard screwdriver or coin tool.
-
Universal Thread Compatibility: Precision-machined threads available in Metric (M-series), German PG (PG-series), and G (PF) standards, optionally supplied with brass locknuts.
Applications
-
Industrial Control Cabinets: Safely blanking unused knockouts and threaded entry ports on outdoor control boxes and junction boxes.
-
Heavy Industrial Machinery: Sealing unassigned wiring holes in motor terminal boxes, packaging machinery, and material handling equipment.
-
Marine & Outdoor Infrastructure: Marine electrical enclosures, port machinery, and power distribution units exposed to rain, salt spray, and extreme weather.
-
Chemical & Processing Facilities: Enclosures operating in wet environments requiring high resistance to weak acids, alkalis, and industrial washing.
Product FAQs
Q1: What is the main purpose of a waterproof stopping plug (screw cap)?
A1: A waterproof stopping plug is used to seal unused threaded cable entries on electrical enclosures. It prevents rain, water jets, moisture, dust, and corrosive agents from entering the housing, keeping internal components clean and maintaining the enclosure’s original IP rating.
Q2: How do I install this round slotted metal screw cap?
A2: Simply thread the plug into the matching threaded entry hole (or pass it through a clearance hole and secure it from inside using a matching brass locknut), ensure the neoprene sealing washer is flush against the panel, and tighten it firmly using a flathead screwdriver.
Q3: Can this stopping plug withstand harsh outdoor temperatures and chemical exposure?
A3: Yes. The neoprene sealing ring is halogen-free and rated V0 (UL94) for flame retardancy. The assembly performs reliably in static operating temperatures between -60°C and +100°C (withstanding brief thermal spikes up to 120°C) while resisting acid, alkali, and oil splash.
Q4: Are these metal screw caps available in stainless steel?
A4: Yes. While nickel-plated brass is our standard high-durability production material, we can also manufacture these stopping plugs in 304 and 316L stainless steel upon request for aggressive marine or offshore environments.
