Medium-Pressure Iron and Steel Threaded Pipe and Pipe Fittings
697 Products
LILY Bearing stocks medium-pressure iron and steel threaded pipe nipples and flanges — a step up in wall thickness from our low-pressure line, in both plain steel and galvanized, plus fittings made specifically for joining dissimilar metals. New to medium-pressure threaded pipe, or not sure whether you need the galvanized or plain steel version? Use the filters below, or the comparison table, to narrow down by product type and material.
Compare Medium-Pressure Threaded Pipe Products
| Category | Product Type | Material | Watch Out For |
|---|---|---|---|
| Thick-Wall Steel Threaded Pipe Nipples and Pipe | Nipples & pipe | Steel | Thicker walls than our low-pressure line — sized for medium-duty service, not extreme pressure |
| Thick-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe | Nipples & pipe | Galvanized iron & steel | Same thick-wall construction with a zinc coating — better for outdoor or damp environments than plain steel |
| Medium-Pressure Steel Threaded Pipe Flanges | Flanges | Steel | A step up from low-pressure flanges — confirm your mating flange uses the same bolt pattern |
| Medium-Pressure Galvanized Steel Threaded Pipe Flanges | Flanges | Galvanized steel | Zinc-coated version of the flange above — better corrosion resistance, same pressure duty |
| Medium-Pressure Pipe Fittings for Joining Dissimilar Metals | Fittings | Mixed | Built to reduce galvanic corrosion at transitions between two different metals — not a substitute for a regular fitting within a single-metal run |
Plain Steel vs. Galvanized
Every product type in this category comes in both plain steel and galvanized versions, with the same thick-wall construction and pressure duty either way. The difference is the zinc coating: galvanized fittings resist rust and corrosion in damp, outdoor, or otherwise exposed conditions, while plain steel costs less and is the standard choice for dry, indoor runs.
Need a Different Size or Configuration?
Don't see the size or material you need? Our team can cross-reference an existing fitting or quote a custom configuration. Request a Quote or Contact Us.
Frequently Asked Questions
How does "medium-pressure" compare to LILY's low- and high-pressure threaded lines?
These pressure tiers reflect wall thickness, which determines the maximum pressure a fitting can safely handle. Medium-pressure fittings have thicker walls than our low-pressure line but aren't built to the same extra-thick-wall standard as our high- and extreme-pressure lines.
Should I choose plain steel or galvanized?
Choose galvanized if the piping will be outdoors, underground, or exposed to moisture, since the zinc coating protects against rust that plain steel has no defense against. For dry, indoor runs, plain steel costs less and performs the same mechanically.
When do I need a dissimilar-metal fitting instead of a regular one?
Use a dissimilar-metal fitting anywhere your piping run transitions from steel to a different metal, such as copper or stainless steel. Connecting two different metals directly can cause galvanic corrosion at the joint over time, which these fittings are built to reduce.
