Nylon Threaded Blanking Plug
The Nylon Threaded Blanking Plug is engineered to securely seal unused cable entry ports, threaded holes, and knockouts in electrical enclosures, junction boxes, and industrial machinery. Molded from high-grade Polyamide 66 (PA66), it maintains the enclosure's original IP rating against dust and moisture while resisting mechanical impact and corrosion. Designed for automated assembly and panel building, it requires no special tools for standard installation.
Product Overview
The Nylon Threaded Blanking Plug is engineered to securely seal unused cable entry ports, threaded holes, and knockouts in electrical enclosures, junction boxes, and industrial machinery. Molded from high-grade Polyamide 66 (PA66), it maintains the enclosure's original IP rating against dust and moisture while resisting mechanical impact and corrosion. Designed for automated assembly and panel building, it requires no special tools for standard installation.
Key Features
Material Integrity: Injection-molded from virgin PA66, offering high tensile strength, UL 94V-2 flame retardancy, and resistance to oils, greases, and weak acids.
Sealing Structure: Integrated O-ring (NBR, EPDM, or Silicone) creates a reliable waterproof barrier against housing surfaces, preventing fluid ingress at threaded interfaces.
Locking Mechanism: Precision-cut external threads with anti-vibration ratchet ribs prevent loosening caused by industrial machinery vibration.
Functional Reliability: Rated for continuous operation across wide temperature fluctuations without cracking or dimensional shrinkage.
Technical Specifications & Part Matrix
|
Part Number / Model |
Thread Type & Size |
Mounting Hole ∅ (mm) |
Thread Length (mm) |
Head ∅ (mm) |
Standard O-Ring |
|
NBP-M12 |
Metric M12 x 1.5 |
12.0 |
8.0 |
15.0 |
NBR / EPDM / Silicone |
|
NBP-M16 |
Metric M16 x 1.5 |
16.0 |
10.0 |
20.0 |
NBR / EPDM / Silicone |
|
NBP-M20 |
Metric M20 x 1.5 |
20.0 |
10.0 |
24.0 |
NBR / EPDM / Silicone |
|
NBP-M25 |
Metric M25 x 1.5 |
25.0 |
12.0 |
29.5 |
NBR / EPDM / Silicone |
|
NBP-M32 |
Metric M32 x 1.5 |
32.0 |
12.0 |
36.5 |
NBR / EPDM / Silicone |
|
NBP-M40 |
Metric M40 x 1.5 |
40.0 |
15.0 |
46.0 |
NBR / EPDM / Silicone |
|
NBP-PG135 |
PG 13.5 |
20.4 |
10.0 |
24.0 |
NBR / EPDM / Silicone |
|
NBP-PG21 |
PG 21 |
28.3 |
11.0 |
33.0 |
NBR / EPDM / Silicone |
Ingress Protection: IP68 (when installed with standard sealing ring according to IEC 60529)
Operating Temperature:
Static: -40°C to +100°C (Short-term up to +120°C; up to +150°C with Silicone O-ring)
Dynamic: -20°C to +80°C
Standard Colors: Light Grey (RAL 7035), Dark Grey (RAL 7001), Black (RAL 9005)
Compliance: RoHS, REACH, UL 94V-2
Engineering Resources & CAD Downloads
Resource Center for Engineers: Download verified technical drawings to streamline your enclosure CAD layout:
[Download 2D CAD Drawing (DXF/DWG)]
[Download 3D Model (STEP/IGES)]
[Download Complete Technical Datasheet (PDF)]
Product Options
Thread Standards: Full range of Metric (M), PG, NPT, and G (PF) threads to match standard panel knockouts and tapped holes.
Color Customization: Standard inventory includes RAL 7035, RAL 7001, and RAL 9005. Custom Pantone or RAL matching available for OEM branding.
Sealing Compounds:
NBR: Provided for general industrial applications (oil/solvent resistance).
EPDM: Specified for outdoor UV exposure and general weathering.
Silicone: Available upon request for high-temperature ranges up to +150°C.
Tooling Interfaces: Available in slotted head, flat head, or internal hex socket configurations depending on installation clearance requirements.
Applications
Electrical Control Cabinets: Closing temporary or future-proof cable entry cutouts in floor-standing and wall-mounted panels.
Industrial Machinery: Sealing sensor and actuator connection ports on CNC machines, conveyor systems, and packaging equipment.
Junction & Distribution Boxes: Maintaining environmental protection integrity in outdoor electrical junction boxes.
Renewable Energy Systems: Inverter housings and combiner boxes requiring reliable outdoor sealing performance.
Installation & Engineering Note
Torque Guidelines: To prevent thread stripping or O-ring over-compression, please adhere to recommended installation torques (e.g., ~2.0 Nm for M20 size depending on panel material). Do not over-torque beyond recommended limits.
Unthreaded Holes: For non-tapped knockouts, use a matching polyamide locknut on the reverse side to ensure secure mechanical retention and maintain IP68 rating.
OEM & ODM Customization
Non-Standard Threads: Custom thread pitches, extended thread lengths, or specialized imperial diameters engineered to specific technical drawings.
Material Modifications: Flame-retardant compounds meeting UL 94V-0 or UV-stabilized polymer formulations for harsh outdoor installations.
Custom Packaging: Bulk industrial bagging, barcoded labeling, or pre-assembled kits tailored to automated line-side replenishment systems.
Quality Control
Dimensional Inspection: Automated optical sorting and periodic caliper checks verify thread pitch diameter, outer diameter, and head thickness against engineering tolerances.
Torque Testing: Routine destruction and installation torque testing ensures thread shear strength meets industrial assembly standards.
Ingress Protection Testing: Lab verification of IP68 submersion and dust-tight performance based on IEC 60529 protocols.
Material Traceability: RoHS, REACH, and UL compliance certificates supplied with every production lot.
Frequently Asked Questions
Q: How do I select the correct plug size for my enclosure knockout?
A: Measure the diameter of the knockout hole or reference the existing cable gland size (e.g., an M20 cable cutout requires an M20 blanking plug). Verify whether the hole is threaded or unthreaded (unthreaded holes require a locknut).
Q: Are sealing O-rings included with the plugs?
A: Yes. Every threaded blanking plug is supplied with a matching O-ring pre-mounted on the thread shoulder to guarantee the IP68 seal.
Q: What is the difference between NBR, EPDM, and Silicone O-rings?
A: NBR provides excellent resistance to oils, petroleum, and industrial solvents. EPDM offers superior resistance to UV radiation and weathering. Silicone is specified for high-temperature environments up to +150°C.
Q: Can these plugs withstand outdoor UV exposure?
A: Standard black plugs (RAL 9005) contain carbon black additives for enhanced UV resistance. For grey plugs installed in direct sunlight, specify UV-stabilized formulations or EPDM/Silicone seals.
Q: What is the minimum order quantity (MOQ) for standard sizes?
A: Standard metric and PG sizes in RAL 7035 or RAL 9005 are stocked in volume, with flexible MOQ packaging available for distribution and manufacturing.
Q: What is the standard production lead time?
A: Stocked items ship within 3 to 5 business days. Custom color matching, non-standard threads, or bulk OEM production runs typically require 15 to 20 business days.
Request a Quote / RFQ Guidance
To receive an accurate technical proposal and competitive commercial pricing within 24 hours, please include the following parameters in your inquiry:
Part Number or Thread Specification: (e.g., NBP-M20 or Metric M20 x 1.5)
Material / O-Ring Compound: (e.g., PA66 + NBR, EPDM, or Silicone)
Color: (e.g., RAL 7035 Grey / RAL 9005 Black)
Estimated Quantity: (Batch quantity or annual forecast)
Additional Requirements: (e.g., Custom packaging, laser labeling, or specific certificates)
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