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Threaded Blanking Plugs

Product Overview

Threaded blanking plugs close off unused threaded entries in electrical enclosures, junction boxes, and equipment housings while maintaining the enclosure's original IP rating. Machined from solid bar stock or precision injection-molded, these plugs prevent moisture, dust, and particulate ingress in industrial environments. They provide mechanical stability and vibration resistance for OEM machinery and electrical control panels.

Key Features

Material Integrity:

Machined from nickel-plated brass, solid stainless steel (AISI 304/316), or injection-molded flame-retardant polyamide (PA66) to withstand specific chemical and environmental exposures.

Positive Sealing Structure:

Supplied with integrated O-rings (NBR, EPDM, or Silicone) or cutting edges to ensure a watertight and dust-tight seal against enclosure walls.

Drive & Installation:

Features slotted, external hex head, or internal hexagon (allen) drive options for secure torque application and flush mounting in restricted spaces.

Vibration Resistance:

Precision-cut ISO, PG, and NPT threads maintain interference fit to resist loosening under continuous industrial machinery vibration.

Technical Specifications

Parameter	Metric Specifications	PG Specifications	NPT Specifications
Thread Standards	ISO metric threads (M12 to M63)	DIN 40430 (PG7 to PG48)	ANSI/ASME B1.20.1 (1/4 to 2 NPT)
Standard Materials	Brass (Nickel-Plated), SS304, SS316, PA66 Nylon	Brass (Nickel-Plated), SS304, SS316, PA66 Nylon	Brass (Nickel-Plated), SS304, SS316, PA66 Nylon
Sealing Ring	NBR (Standard), EPDM, Silicone	NBR (Standard), EPDM, Silicone	NBR (Standard), EPDM, Silicone
Operating Temperature	-40°C to +100°C (Nylon up to +120°C, Metal with Silicone up to +200°C)	-40°C to +100°C	-40°C to +100°C
Ingress Protection	IP68 (5 bar) / IP66	IP68 (5 bar) / IP66	IP68 (5 bar) / IP66
Direct Compliance	RoHS, REACH, CE	RoHS, REACH, CE	RoHS, REACH, CE

Product Options

Material Finishes
Nickel-plated brass for standard industrial corrosion resistance.

Stainless steel (AISI 304 / 316) for marine, chemical, and food-processing environments.

Polyamide (PA66) for lightweight, non-conductive, and cost-sensitive applications.

Head Profiles: Hexagonal head (for wrench tightening), low-profile dome head, and flush internal hex drive.

Sealing Options: NBR for general oil resistance; EPDM for outdoor UV and ozone resistance; Silicone for high-temperature ranges.

Applications

01.

Electrical Control Panels:

Sealing knockouts or pre-drilled cable entry holes reserved for future expansion.

02.

Industrial Machinery:

Closing unused ports on motor junction boxes, hydraulic manifolds, and pneumatic valve islands.

03.

Outdoor Enclosures:

Protecting telecommunication cabinets, solar inverter boxes, and traffic control pillars from rain and dust accumulation.

04.

Process Equipment:

Panel installations in wastewater treatment and chemical handling plants requiring corrosion-resistant seals.

OEM & ODM Customization

Non-Standard Threads:

Custom thread pitches, UNEF, G (PF), or BSPP threads machined to drawing specifications.

Dimensional Modifications:

Extended thread lengths, custom head thicknesses, or specialized flange diameters.

Material Alternatives:

Production using specific alloy grades or specialized engineering plastics.

Laser Marking:

Custom part numbers, batch codes, or corporate logos laser-etched onto plug heads.

Quality Control

Dimensional Verification:

100% optical comparator and Go/No-Go thread gauge testing to ensure strict adherence to ISO, DIN, or NPT thread profiles.

Raw Material Inspection:

Spectrometer testing verifies elemental composition of incoming brass rods and stainless steel stock.

Sealing Performance:

Vacuum decay and hydrostatic pressure testing conducted on sample batches to verify IP68 compliance.

Traceability:

Material test reports (EN 10204 3.1) and dimensional inspection reports available upon request prior to shipment.

Frequently Asked Questions

Q: How do I select the correct blanking plug size if I only know the cutout hole diameter?

A: Measure the diameter of the hole or check the corresponding cable gland size previously designated for that port. Metric holes correspond directly to thread sizes (e.g., an M20 hole requires an M20x1.5 plug).

Q: Are O-rings included with the metal blanking plugs?

A: Yes. Every metal and plastic plug ships pre-assembled with a compatible sealing O-ring matched to the operating temperature range of the chosen material.

Q: Can these plugs withstand washdown procedures in food processing plants?

A: Yes. Stainless steel (AISI 316) plugs combined with EPDM O-rings withstand high-pressure, high-temperature washdowns and routine chemical sanitization.

Q: What is the standard production lead time for bulk orders?

A: Standard catalog items ship within 3 to 7 business days. Custom machined orders require 15 to 25 business days depending on raw material availability and quantity.

Q: What is the Minimum Order Quantity (MOQ) for non-standard threads?

A: MOQ for custom dimensions starts at 500 pieces per size, subject to engineering evaluation of the technical drawing.

Q: Do you provide sample batches for testing?

A: Yes. Free evaluation samples for standard sizes (M20, M25, PG13.5) are available; freight costs apply.

Request a Quote

To receive a formal quotation, please provide the following details:
Product Code / Model: (e.g., Threaded Blanking Plug)
Material: (Nickel-Plated Brass / Stainless Steel 304 / Stainless Steel 316 / PA66 Nylon)
Thread Specification & Size: (e.g., Metric M25x1.5, NPT 1/2, PG16)
Quantity Required: (Per order / Annual forecast)
Special Requirements: (Custom O-ring material, laser marking, specific packaging, or inspection reports)

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