Sealed Threaded Blanking Plug
The Sealed Threaded Blanking Plug provides a reliable, permanent, or temporary seal for unused threaded entries in electrical enclosures, junction boxes, and industrial machinery. Integrated with an under-head O-ring, it ensures environmental ingress protection up to IP68/IP69K, preventing dust, moisture, and chemical agents from compromising internal components.
Product Overview
The Sealed Threaded Blanking Plug provides a reliable, permanent, or temporary seal for unused threaded entries in electrical enclosures, junction boxes, and industrial machinery. Integrated with an under-head O-ring, it ensures environmental ingress protection up to IP68/IP69K, preventing dust, moisture, and chemical agents from compromising internal components.
Key Features
Material Options: Precision-machined from nickel-plated brass, stainless steel (AISI 304/316), or high-grade flame-retardant polyamide (PA66).
Positive Sealing Geometry: Features a dedicated under-head O-ring groove that secures the seal (NBR or Silicone) against displacement caused by thermal expansion or mechanical vibration.
Installation Efficiency: Low-profile hexagonal head designed for standard open-end wrenches; internal hex socket and slot-head variants available for space-constrained layouts.
Ingress Protection: Rated to IP68 (5 bar, 1 hr) and IP69K, withstanding high-pressure, high-temperature washdowns.
Technical Specifications
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Thread Standards |
Metric (ISO / EN 60423), PG (DIN 40430), NPT (ANSI/ASME B1.20.1), G (ISO 228 / BSP). |
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Size Range |
Metric (M12 to M63), PG (PG7 to PG48), NPT (1/4" to 2"). |
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Operating Temperature |
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| Metal (Brass / Stainless Steel): -40°C to +100°C (NBR); up to +200°C (Silicone). | |
| Plastic (PA66): -40°C to +100°C (UL 94V-2 flame rating). | |
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Certifications |
CE, RoHS, REACH, UL. |
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Engineering Support |
3D CAD models (STEP / IGES) and 2D technical drawings available for immediate download or request. |
Product Options
Body Materials: Nickel-plated brass, 304/316 stainless steel, PA66 nylon.
O-Ring Compounds: NBR (standard oil resistance) / Silicone (extended temperature and ozone resistance).
Head Profiles: Standard external hex, low-profile dome, internal hex drive.
Surface Finishes: Passivated (stainless steel), electro-plated (nickel on brass), or color-matched molded nylon.
Applications & Industry Alignment
Electrical Control Panels: Sealing spare knockouts or pre-machined cable entry points in automation cabinets.
Industrial Machinery: Blanking unused hydraulic, pneumatic, or sensor ports on gearboxes and manifolds.
Outdoor & Marine Infrastructure: Protecting solar inverter housings, telecom junction boxes, and coastal instrumentation from salt spray and UV degradation.
Process Equipment: Sealing ports in chemical, pharmaceutical, and food-processing environments (FDA-compliant seal options available).
OEM & ODM Customization
Non-Standard Threads: Custom thread pitches, UNEF, or proprietary thread profiles manufactured directly from customer CAD data.
Dimensional Alterations: Customized thread lengths, flange diameters, or custom head thicknesses.
Alloy Sourcing: Special material machining (e.g., Aluminum, Titanium) for specific chemical compatibility.
Traceable Marking & Packaging: Laser-etched part numbers, custom barcoding, and dedicated bulk or individual polybag packaging.
Quality Control
Machining Precision: 100% optical sorting and GO/NO-GO thread gauge verification to guarantee pitch diameter tolerances.
Component Inspection: Automated durometer and dimensional checks on sealing O-rings prior to assembly.
Performance Testing: Periodic pneumatic and hydrostatic pressure testing to validate IP68/IP69K sealing under operating loads.
Documentation: Mill Test Certificates (MTC), dimensional inspection sheets, and RoHS/REACH declarations provided upon request.
Frequently Asked Questions
Q: How do I determine the correct thread size if I only have the mounting hole diameter?
A: Measure the inner diameter of the hole and match it against our thread conversion guide. For instance, an M20 metric plug requires a nominal 20mm clearance hole, whereas NPT and PG correspond to specific conduit and pipe standards.
Q: What is the primary difference between NBR and Silicone O-rings?
A: NBR provides excellent resistance to petroleum-based oils, fuels, and general industrial chemicals up to +100°C. Silicone handles wider temperature extremes (up to +200°C) and offers superior resistance to weathering and ozone.
Q: Are these plugs reusable?
A: Yes, metal plugs with undamaged O-rings can be reused. Always inspect the O-ring for cuts, flattening, or hardening prior to reinstallation to ensure the IP68 seal remains uncompromised.
Q: Do the plugs ship with the O-rings pre-installed?
A: Yes, every plug is delivered pre-assembled with the correct O-ring securely seated in the under-head groove.
Q: What is the Minimum Order Quantity (MOQ) for standard catalog items?
A: Standard sizes in nickel-plated brass and polyamide carry low MOQs (typically 100 pcs). Custom threads or special materials are evaluated based on batch production runs.
Q: What is the standard production and shipping lead time?
A: In-stock standard items ship within 3 to 5 business days. Custom OEM production runs typically require 15 to 25 business days depending on tooling and plating schedules.
Request a Quote & CAD Files
To receive a formal quotation and 3D CAD files within 24 hours, please submit the following specifications:
Part Number or Material (e.g., Nickel-plated brass vs. 316 Stainless Steel)
Thread Standard & Size (e.g., M20 x 1.5, NPT 1/2")
Required Quantity (Annual volume or initial batch size)
O-Ring Preference (NBR or Silicone)
Special Requirements (Laser marking, specific packaging, or third-party inspection reports)
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