Brass Threaded Blanking Plug
Permanent or temporary closure of spare cable entry ports and enclosure knockouts.
Precision CNC-machined solid brass stopping plugs designed to seal unutilized threaded entries in electrical enclosures, junction boxes, and industrial machinery. Engineered to maintain IP68 ingress protection and withstand high-vibration operational environments.
Product Overview
Function: Permanent or temporary closure of spare cable entry ports and enclosure knockouts.
Manufacturing: Precision CNC-machined from solid brass bar stock for maximum dimensional stability.
Sealing: Integrated O-ring compression groove ensures liquid-tight and dust-tight protection without thread sealants.
Key Features
Material Construction: High-grade brass (CW614N / CuZn39Pb3) offering high tensile strength and natural corrosion resistance. Optional electro-nickel plating for enhanced chemical resistance.
Positive Sealing Geometry: Dedicated O-ring retention groove prevents displacement under heavy mechanical vibration.
Precision Threads: Clean, burr-free external profiles manufactured strictly to international standards, ensuring smooth installation without galling.
Vibration Resistance: Low-profile hex and slotted head designs engineered with uniform thread pitch to prevent loosening.
Technical Specifications
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Thread Standards |
Metric (EN 60423), PG (DIN 40430), NPT (ANSI/ASME B1.20.1), G / BSP (ISO 228) |
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Size Range |
Metric: M12 to M63 |
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PG: PG7 to PG48 |
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NPT: 1/4" to 2" |
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Body Material |
Brass CW614N (Raw finish or Electro-nickel plated) |
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O-Ring Material |
NBR (Standard, -40°C to +100°C) | EPDM (Optional, -40°C to +120°C) |
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Ingress Protection |
IP68 (5 bar / 30 min) with correct O-ring installation |
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Operating Temperature |
-40°C to +100°C (continuous NBR rating) |
Product Options
Surface Finish: Unfinished raw brass or electro-nickel plated (passivated for salt-spray endurance).
Drive Types: Hexagonal head (wrench tightening) and internal hex / slotted low-profile variants (space-constrained panels).
Thread Treatment: Pre-applied microcapsule thread-locking sealant available upon request.
Applications
Electrical Control Panels: Sealing reserved knockout entries in industrial automation and PLC cabinets.
Junction & Distribution Boxes: Closing unused conduit ports in outdoor, washdown, or corrosive plant environments.
Machinery & Equipment: Blanking auxiliary fluid, pneumatic, or electrical access ports.
Renewable Energy & Marine: Enclosures exposed to moisture, salt mist, and UV radiation.
OEM & ODM Customization
Non-Standard Machining: Custom thread pitches, non-standard body lengths, or imperial-to-metric conversion threads per 2D/3D drawings.
Laser Etching: Permanent part numbers, batch codes, or company logos marked on the plug head.
Packaging: Bulk industrial bagging, compartmentalized boxes, or custom barcoded distributor packaging.
Quality Control
Dimensional Verification: Automated optical sorting and 100% periodic micrometer checks on thread pitch diameter and lead accuracy.
Corrosion Testing: Periodic 96-hour neutral salt spray tests (ASTM B117) on nickel-plated lots.
Seal Performance: Vacuum decay and pressure testing confirming O-ring compression limits and IP68 compliance.
Traceability: Material test certificates (EN 10204 3.1) and RoHS/REACH compliance documentation available upon shipment.
Frequently Asked Questions
Q: How do I select the correct thread standard for my enclosure?
A: Match your enclosure knockout standard. European panels typically use Metric (EN 60423) or PG threads; North American infrastructure specifies NPT (tapered) or G (parallel) threads. Never intermix parallel and tapered threads.
Q: Are O-rings included with standard plugs?
A: Yes. Every plug is supplied pre-assembled with an appropriately sized NBR O-ring ensuring an immediate IP68 seal.
Q: What is the functional difference between raw brass and nickel-plated brass?
A: Raw brass provides standard industrial corrosion resistance and develops a natural oxidation patina. Nickel-plated brass offers enhanced resistance to chemical exposure, atmospheric oxidation, and moisture.
Q: Will these plugs vibrate loose in heavy machinery applications?
A: No. Precision thread tolerances and a resilient compression O-ring dampen mechanical vibration, securing the plug during continuous operation.
Q: What is your standard Minimum Order Quantity (MOQ)?
A: Standard catalog stock items start at 500 pieces per size. Custom thread geometries or special plating start at 2,000 pieces.
Q: What is the standard production lead time?
A: In-stock items ship within 3 to 5 business days. Custom manufactured parts or large volume OEM orders require 15 to 25 business days.
Request a Quote
To receive a prompt technical quotation, please specify:
Product Name: Brass Threaded Blanking Plug
Thread Specification: (e.g., M20 x 1.5, PG13.5, 1/2" NPT)
Finish Preference: Raw Brass or Nickel-Plated
Quantity Required: (Prototype quantity, annual volume, or trial order)
Special Requirements: (Custom laser marking, material test certificates, or specific packaging)
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