Metallic Conduit Connectors

Heavy-Duty Metallic Conduit Connectors | Secure Industrial Raceway Termination

Engineered for reliable mechanical connection and ground continuity in industrial electrical raceways, these metallic conduit connectors secure flexible, liquid-tight, and rigid conduits against vibration, mechanical stress, and moisture ingress. Designed for electrical distributors, panel builders, and OEM machinery manufacturers requiring strict adherence to dimensional tolerances and pull-out resistance standards.

Types

Straight Liquid-Tight Connectors

Designed for terminating liquid-tight flexible metallic conduits to dry or wet locations, featuring an internal sealing ferrule and compression nut.

Flexible Conduit Set-Screw Connectors

Cost-effective open-type fittings utilized for general indoor commercial wiring and dry industrial environments where liquid-tight sealing is not required.

Rigid to Flexible Transition Connectors

Specialized combination fittings designed to couple rigid steel conduits (IMC/RSC) directly with flexible metallic conduits.

Malleable Iron Heavy-Duty Connectors

High-impact structural fittings built for harsh industrial environments, petrochemical plants, and underground conduit runs.

Construction

Body & Nut Material

Precision die-cast zinc alloy, high-tensile malleable iron, or corrosion-resistant stainless steel (AISI 304/316).

Sealing Component

High-grade oil-resistant nitrile rubber (NBR) or EPDM sealing ring for liquid-tight variants.

Ferrule / Grounding Cone

Galvanized spring steel or brass grounding ring ensuring positive ground continuity and vibration-proof retention.

Surface Finish

Hot-dip galvanized, trivalent clear zinc plating, or passivation for stainless steel variants to prevent white rust formation during outdoor exposure.

Technical Specifications

Parameter	Standard Metric Range	US / Imperial Range	Tolerance / Compliance
Trade Sizes	M12 to M63	3/8 inch to 6 inch	ISO / NPT / PG / G Threads
Ingress Protection	IP65, IP67, IP68	NEMA 4X, 6, 12	IEC 60529 / UL 514B
Operating Temperature	-40 deg C to +105 deg C (Standard) / Up to +150 deg C (High Temp NBR)	IEC 60079 compliance
Tensile Pull-Out Strength	Exceeds UL 514B pull requirements by 25 percent	Verified via hydraulic pull tester
Salt Spray Resistance	96 to 500 hours (depending on plating specification)	ASTM B117 standard

Electrical Metallic Tube Set-Screw Connector

Application

Industrial Automation & Robotics: Securing flexible metal conduits routing control power and sensor signals on automated production lines subject to constant mechanical flex.

HVAC & Compressor Units: Terminating liquid-tight metallic raceways exposed to outdoor weather, vibration, and condensation.

Panel Building & Switchgear: Bonding metallic enclosures to conduit systems to maintain continuous earth grounding paths.

Renewable Energy Installations: Protecting cabling on solar tracker drives and wind turbine nacelle junction boxes.

Manufacturing Capability

Raw Material Control

Direct spectrographic verification of incoming zinc ingot (Zamak 3/5), malleable iron billets, and stainless steel coil stock prior to machining.

Precision Machining

45 sets of high-precision CNC multi-axis lathes and automated transfer machines maintaining thread pitch accuracy within +/-0.02 mm.

Die Casting

Automated hot-chamber die-casting machines ranging from 88T to 280T equipped with thermal-regulated molds to eliminate internal porosity.

Thread Integrity Inspection

100 percent Go/No-Go thread gauge testing on every batch for NPT, Metric, and PG thread profiles to prevent cross-threading on installation sites.

Quality Control

Pull-Out Force Testing

Destructive and non-destructive tensile testing conducted per UL 514B to verify conduit retention under mechanical stress.

Salt Spray Chamber Testing

96-hour continuous neutral salt spray testing (ASTM B117) to verify corrosion resistance of zinc and galvanized finishes.

Dimensional CMM Verification

Automated optical comparator and coordinate measuring machine (CMM) inspection for internal diameter, sealing groove depth, and hexagon flat tolerances.

Torque Testing

Verification of compression nut tightening torque limits to ensure gasket compression without thread stripping.

Our Certificates

Customization Options

01.

Thread Variations

Custom NPT, NPS, Metric (M), PG, and G (PF) thread lengths and pitches machined to drawing specifications.

02.

Material Selection

Specific alloy grades including lead-free brass, specific stainless steel compositions, or specialized bronze for marine environments.

03.

Surface Treatments

Thick-film passivation, black oxide coating, epoxy powder coating, or specialized nickel plating for corrosive chemical plants.

04.

Laser Marking

Custom OEM branding, batch codes, trade size markings, and UL/CE certification logos laser-etched directly onto connector bodies.

Packaging and Delivery

Standard Industrial Packaging

Polybag inner grouping packed in heavy-duty double-wall corrugated master cartons reinforced with edge protectors.

Palletization

Fumigation-free wooden or plastic pallets wrapped with stretch film and secured with strapping bands for container export.

Lead Time

15 to 25 days for standard catalog items; 30 to 45 days for custom OEM tooling and production runs.

Shipping Terms

FOB, CIF, DDP sea freight or air express routing handled via major ports (Ningbo/Shanghai).

FAQ

Q: What thread standards are available for your metallic conduit connectors?

A: Connectors are manufactured with standard NPT (ANSI B1.20.1), Metric (ISO 68-1 / ISO 965), PG (DIN 40430), and G / PF (BSPP) threads. Custom thread lengths or special pitch requirements can be produced according to provided engineering drawings.

Q: How do these connectors maintain earth grounding continuity?

A: Fittings designed for flexible metallic conduits incorporate internal grounding cones or spring steel bonding ferrules that bite into the conduit spiral, establishing a low-impedance grounding path that complies with industrial electrical safety standards.

Q: What is the difference between standard zinc alloy and malleable iron connectors?

A: Die-cast zinc alloy connectors provide excellent dimensional precision, clean aesthetics, and adequate corrosion resistance for standard indoor or commercial applications. Malleable iron connectors offer higher impact resistance, mechanical strength, and durability for heavy-duty industrial, petrochemical, and outdoor underground installations.

Q: Are your connectors certified for wet or outdoor locations?

A: Liquid-tight metallic connectors feature integrated NBR or EPDM internal sealing rings and sealing washers that achieve IP67/IP68 and NEMA 4X ratings when properly installed, preventing moisture, oil, and coolant ingress.

Q: What minimum order quantities (MOQ) apply for custom-sized or OEM-branded connectors?

A: Standard catalog sizes are stocked with flexible MOQ terms. Custom thread dimensions, special plating, or laser-etched OEM branding typically require an MOQ based on batch forging or CNC setup requirements, detailed during the technical quotation review.

Q: What corrosion resistance testing do you perform on plated connectors?

A: All zinc-plated and galvanized connectors undergo regular neutral salt spray testing per ASTM B117 standards. Standard electro-zinc plating withstands a minimum of 96 hours without white rust formation, with extended salt spray durations available upon request.

As one of the leading metallic conduit connectors manufacturers and suppliers in China, we warmly welcome you to buy discount metallic conduit connectors made in China here from our factory. All customized products are with high quality and competitive price. Contact us for pricelist.