Conduit Fittings

Electrical conduit fittings organized by the raceway they serve: EMT set screw and compression, threaded rigid, PVC, and liquidtight in all common trade sizes, with free shipping on every order. The selector below the products maps each conduit system to its fittings and governing NEC article.

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Conduit Fitting Selection Guide

Conduit Connector Types and When Each Applies

Within the EMT family, the set screw versus compression choice is environmental. Set screw connectors and couplings are the economical default for dry interior work. Compression fittings seal the joint mechanically and are the pick where the run is exposed to moisture or embedded in concrete; look for raintight or concrete-tight markings when the location demands them. Rigid conduit threads together like pipe, terminating in boxes through locknuts and bushings that protect conductor insulation from the knockout edge. Liquidtight connectors thread into the flexible jacket and carry a sealing ring for the final whip to a fixture, sign, or rooftop unit where vibration or alignment rules out a rigid connection. PVC assembles with solvent cement, and every glued joint is permanent, so dry-fit the layout first.

Matching Fittings to Electrical Conduit Pipe

Trade size is nominal, not a physical measurement, and it is the one spec that must match exactly: a 3/4 in EMT connector fits 3/4 in EMT and nothing else. Fitting systems also do not cross over; EMT fittings never terminate PVC, and threaded rigid fittings never grip EMT, even when the electrical conduit pipe diameters look close. Where a run transitions between systems, use a listed transition fitting rather than an improvised joint. Support hardware completes the bill of materials: the NEC requires EMT to be strapped within 3 ft of every box or fitting and at least every 10 ft along the run, so count straps and hangers when you count couplings.

Ordering for the Job, Not the Piece

Fittings are a volume item, and shortages surface at the worst time: mid-rough-in, with an inspector scheduled. Contractors typically order connectors and couplings by the box alongside straps, locknuts, and bushings for the full run, then add a margin for field changes. Stock status and lead times are listed on each product page, so you can confirm the whole fitting package is available before the crew mobilizes. The boxes these fittings terminate into are in Electrical Boxes and Weatherproof Boxes, bonding hardware is under Ground Clamps, and the conductors themselves are in Wire and Cable. Browse the full Electrical Boxes and Fittings section for everything between the panel and the fixture.

Electrical Conduit Fittings, Organized by Conduit System

Half the results for this search are not even electrical; the other half are filter pages that assume you already know exactly which fitting family you need. Here is the organizing fact instead: the raceway decides the fitting. Identify the conduit system on the job and the connector, coupling, and termination choices narrow to one family. This selector maps the four systems that cover nearly all commercial lighting and power work to their fittings, trade sizes, and the NEC article that governs each.

Conduit SystemNEC ArticleFitting FamiliesCommon Trade Sizes
EMT (electrical metallic tubing)358Set screw and compression connectors and couplings1/2 to 4 in
Rigid metal conduit (RMC)344Threaded couplings, locknuts, bushings, hubs1/2 to 6 in
PVC (rigid nonmetallic)352Solvent weld (glued) couplings, adapters, expansion fittings1/2 to 6 in
Liquidtight flexible metal (LFMC)350Screw-in liquidtight connectors, straight and angled3/8 to 2 in

Frequently Asked Questions About Conduit Fittings

Set screw fittings clamp the tubing with a screw and are the economical standard for dry interior locations. Compression fittings compress a ring around the tubing for a tighter mechanical seal and are the correct choice for damp locations, exterior runs, and joints embedded in concrete. Check the listing marks: fittings rated for those uses carry raintight or concrete-tight designations.

Standard set screw fittings are not. For exterior and wet locations, specify compression fittings that are specifically listed and marked as raintight. The marking matters to inspectors: an unmarked compression fitting in a wet location is a correction waiting to happen. Where conduit enters an enclosure outdoors, pair the raintight fitting with a weatherproof box or hub rated for the location.

No. Each conduit system uses its own fitting family: EMT uses set screw or compression, rigid metal conduit uses threaded fittings, PVC uses solvent weld sockets, and liquidtight flex uses screw-in liquidtight connectors. Diameters may look close but the systems are not interchangeable and mixing them fails inspection. Where a run changes systems, use a listed transition fitting made for that combination.

Liquidtight fittings terminate liquidtight flexible metal conduit, the jacketed flex used for the final connection to equipment that vibrates or cannot be aligned to a rigid run: HVAC units, motors, signs, and outdoor fixtures. The fitting threads into the conduit spiral and seals against the jacket with a gland, keeping water out of the enclosure. Straight and 90 degree versions cover most equipment entries.

For EMT, the NEC requires support within 3 ft of every box, cabinet, or fitting and at intervals not exceeding 10 ft along the run. Rigid metal conduit follows similar spacing with allowances that vary by trade size. Count straps and hangers when estimating fittings; missing supports are among the most common rough-in inspection corrections on commercial jobs.

A locknut secures the connector or conduit end to the enclosure wall and establishes the mechanical and bonding connection. A bushing caps the raw end to protect conductor insulation from abrasion against the metal edge. On larger sizes and services, insulated or grounding bushings may be required. Skipping the bushing risks insulation damage that shows up later as a fault, not at inspection.

Common distribution stock runs 1/2 in through 4 in for EMT, and up to 6 in for rigid and PVC systems, with liquidtight fittings typically 3/8 in through 2 in. Trade size is nominal: it names the conduit system size rather than a measured diameter, and fittings only fit their exact trade size. Most commercial lighting branch circuits run 1/2 in and 3/4 in.