Looking for an adjustable swivel ring hanger? Empire's EM-LOK (Fig. 310 / NFPA 310NF) is a direct, in-stock equivalent to the swivel rings estimators usually spec by name — Anvil Fig. 69 and Cooper B-Line B3170. Here's an honest, side-by-side look so you can match the part and the listing to your job.
Listed where it counts
The galvanized EM-LOK swivel ring is UL Listed (3/4–8") and FM Approved (3/4–2"). For fire sprinkler work, the EM-LOK NFPA (Fig. 310NF) is UL & ULC Listed and FM Approved (2-1/2–8") for NFPA 13 systems — the equivalent of B-Line's B3170NF.
Quick cross-reference
| PVF Pro — Empire EM-LOK | Anvil | Cooper B-Line |
| Adjustable Swivel Ring (Fig. 310) | Fig. 69 | B3170 |
| NFPA Swivel Ring (Fig. 310NF) | Fig. 69 (NFPA) | B3170NF |
How they compare
| EM-LOK (PVF Pro) | Anvil 69 / B-Line B3170 | |
| Type / standard | MSS Type 10 swivel ring | MSS Type 10 swivel ring |
| UL / FM (standard) | UL 3/4–8", FM 3/4–2" | UL / FM listed |
| NFPA 13 version | Yes — Fig. 310NF (UL/ULC + FM 2-1/2–8") | Yes — B3170NF |
| Finishes / options | Pre-galv, plastic-coated, felt-lined, T-304, T-316, copper-gard, OD & domestic | Galv + select options |
| Availability | In stock — ships same / next business day | Varies by distributor |
| Brand recognition | Growing | Long-established, often spec'd by name |
EM-LOK load ratings (Fig. 310)
Maximum recommended load by pipe size, per Empire engineering data. Apply your project's factor of safety. Anvil and B-Line publish their own ratings — confirm theirs against their current data when substituting.
| Pipe Size | Max. Rec. Load (lb) |
| 1/2–3/4" | 400 |
| 1–3-1/2" | 600 |
| 4–5" | 1,000 |
| 6–8" | 1,250 |
Where each wins
Choose Anvil 69 or B-Line B3170 when the submittal calls one out by name and the spec won't accept an "or equal," or when your standard is built entirely around one brand's catalog. They're long-established names with deep engineering recognition.
Choose EM-LOK when you want the same MSS Type 10 swivel ring — including the UL/FM and NFPA 13 listed versions — in stock today, with the widest finish range (galvanized, plastic-coated, felt-lined, 304/316 stainless, copper-gard, and domestic), usually at a better delivered cost. On "or equal" jobs it drops straight in.
Need it on the truck today?
EM-LOK swivel rings ship same or next business day. Buying a job's worth? Contact us for contractor pricing.
Cross-reference is for identification only. Anvil® and Cooper B-Line® are trademarks of their respective owners, which are not affiliated with, sponsoring, or endorsing Empire Industries or PVF Pro. Listings and load ratings shown are Empire's; always confirm fit, listing, and load rating for your application against current manufacturer data.