Threaded vs Set-Screw Conduit Bodies (Rigid/IMC vs EMT)
Sep 28, 2026
The fastest way to waste a conduit body order is to match the type and size while ignoring the raceway system. Threaded NPT bodies belong on rigid and IMC. Set-screw bodies belong on EMT. Conversions Tech stocks both. This guide keeps the choice boring and correct.
Threaded NPT for rigid and IMC
Threaded bodies use NPT threads. In our planning catalog language they sit in the 675-300xx series. Configurations include LB, LL, LR, C, and T in 1/2 inch through 2 inch. Pages show size for size cross references to Crouse-Hinds Condulet, Appleton, and O-Z/Gedney Form 7 style lines (LB17 to LB67 and matching LL, LR, C, T style references).
Use threaded when the raceway is rigid or IMC and the design calls for threaded conduit bodies.
Set-screw for EMT
Set-screw bodies clamp EMT. Planning series language: 677-300xx. Same configuration set LB, LL, LR, C, T across 1/2 inch through 2 inch. Product pages show Appleton E-series style crosses (ELB-style references and related).
Use set-screw when the raceway is EMT and the fitting system is set-screw.
Summary table
| System | CT series cue | Raceway | Cross language on page | Shop |
|---|---|---|---|---|
| Threaded NPT | 675-300xx | Rigid, IMC | Form 7 style (Crouse-Hinds, Appleton, O-Z/Gedney) | Collection |
| Set-screw | 677-300xx | EMT | Appleton E-series style | Same collection, set-screw products |
Landing overview: Conduit bodies Cross hub: Cross reference
Mistakes to avoid
- Ordering Form 7 style threaded habits for an EMT rack without checking set-screw pages.
- Ignoring cover orientation (LB vs LL vs LR) after picking the system.
- Assuming list price equals your trade price. Apply for trade pricing if you buy ongoing.
- Skipping the live cross line on the SKU.
Spec and fulfillment facts
UL Listed copper-free aluminum. NEMA 3R. About 60 SKUs. Mid hundreds of most sizes in stock. Same-day shipping on in-stock items. List anchors before discount: 1/2 inch $3.47 through 2 inch $22.21 as published on the line.
Second source framing
Contractors buy when the house is out. Distributors buy to refill. Both are welcome. Supply houses are customers. We do not message as a replacement for the counter relationship.
FAQ
Can I thread EMT into a threaded NPT body?
Follow the fitting system designed for that raceway. CT set-screw bodies are the EMT path in this line. Confirm on the product page.
Do set-screw pages show Form 7 LB17 style numbers?
Set-screw pages emphasize Appleton E-series style crosses. Threaded pages emphasize Form 7 style crosses. Read the page you are on.
How do I get help matching a ticket?
Live chat with Ryan, email CS@ConversionsTech.com, or call 1 (307) 206-0534. Send type, size, and threaded versus set-screw.
Next steps
Filter the collection, use the landing page, and keep the cross-reference hub open while you build the PO.
Field examples (system first)
Example A: Commercial EMT rack, set-screw couplings already on the cart. The body must be set-screw. Open set-screw LB or LL pages, read Appleton E-series style crosses, match size, order.
Example B: Rigid feeder with threaded conduit. The body must be threaded NPT. Open threaded pages, read Form 7 style crosses, match size, order.
Example C: Mixed drawing. Split the PO. Label lines EMT and rigid. Never let a junior buyer merge them into one ambiguous line.
Why series cues matter internally
675-300xx and 677-300xx language in our planning docs keeps merchandising and ads honest. Customers see clear titles: threaded or set-screw. If a title ever confuses you, trust the product options and the cross block, then email CS@ConversionsTech.com.
Inspection before the truck leaves
Photo the stamp size if the crew is remote. Confirm cover orientation needs with the foreman, not only the PA. Confirm NEMA 3R and aluminum meet the spec section you are buying against. Confirm trade tier on the quote if the account is approved.
Attach fittings deliberately
After bodies, pull fittings from the 144 SKU set with RACO and Bridgeport style crosses. Keep EMT fittings with EMT bodies. Keep rigid fittings with rigid bodies. Start from the conduit bodies landing page, then expand the cart.
Training blurb you can paste to a branch buyer
CT conduit bodies: aluminum, UL Listed, NEMA 3R, half inch to two inch. Threaded for rigid and IMC, set-screw for EMT. Crosses on every page. Second source when we are out. Same-day shipping on in-stock items. Trade app on the site. CS@ConversionsTech.com or 1 (307) 206-0534.
