A lampshade fitter is the metal structure that holds a shade onto a lamp, and it does more work than its size suggests. The word fitting appears all over home improvement, from PEX plumbing piping and its fittings to the small metal fitters on a lamp, and in every case the fitting determines whether the assembly stays together. Choose the wrong fitter and the shade wobbles, sits crooked, or falls off; choose the right one and the lamp looks finished.
There are four main fitter types: spider, uno, Euro, and clip-on. Each attaches differently, suits different lamp bases, and changes how the shade sits on the socket.
Replacing a shade is one of the cheapest upgrades in a room, and knowing the fitter type before you shop is the difference between a five-minute swap and a return trip to the store.
What Is a Lampshade Fitter?
A lampshade fitter consists of prongs and a central attachment, usually a washer, that connects to the lamp base. The fitter secures the shade three ways: on a harp, on top of the socket, or directly on the lightbulb.
Anatomy of a Fitter
The prongs, sometimes called arms, spread from the washer to the shade rim. The washer is the ring that sits on the harp or socket. Fitters come in gold, silver, black, and white finishes to match the lamp hardware.
The job is mechanical, but the parts are tiny. Unlike pipe fittings that carry water under pressure, a lamp fitter carries only its own weight, which is why the tolerances are so fine and the failure modes are so visible.
A fitter is typically gold, silver, black, or white, and the finish should echo the lamp base. Mixing a polished brass shade fitter with a matte black lamp looks accidental even when the size is perfect.
Fitters also differ in how they attach to the shade itself. Most shades arrive with the fitter already riveted or sewn in place, but replacement fitters can be fitted to a bare shade frame, which matters when you are restoring an antique lamp rather than buying new.
The Four Main Fitter Types at a Glance
Each fitter type solves the same problem, holding a shade in place, with a different attachment point. The choice depends on the lamp: whether it has a harp, how the socket is shaped, and how large the shade is.
How the Types Divide
- Spider: three prongs meeting at a washer that sits on a harp.
- Uno: a threaded ring that screws onto the socket.
- Euro: a washer that sits on top of the socket without threads.
- Clip-on: spring clips that grip the lightbulb itself.
| Fitter type | Attachment point | Best for | Key detail |
|---|---|---|---|
| Spider | Washer on harp, finial on top | Table and floor lamps with a harp | Most common type |
| Uno | Threaded ring on the socket | Lamps without a harp | Screws on like a nut |
| Euro | Flat washer on the socket top | European-style sockets | Tool-free, low profile |
| Clip-on | Spring clips on the bulb | Small shades and chandeliers | Light shades only |
The division by attachment point mirrors how types of pipe fittings divide by joining method: the geometry of the joint defines the part.
Fitter Choice Affects Style and Function
The fitter determines the shade’s drop and how much light escapes around the top. A spider shade on a harp sits higher and shows more bulb; an uno shade sits lower and encloses the socket.
Shade sizes are described by the top and bottom diameters and the slant height. A 4-inch fitter washer pairs with shades designed for that opening, and the lamp’s harp height sets the maximum shade depth.
Spider Fitters: The Harp Standard
The spider fitter is the most common type for table and floor lamps with a harp. Three metal prongs come together at a central washer, and the washer drops over the top of the harp.
How the Harp Works
The harp is an upside-down U-shaped metal piece attached to the lamp base, rising around and above the bulb. The shade sits on the harp, and a finial screws down on top of the washer to lock it in place.
Finial Fit Tips
The finial must be twisted until tight so the shade sits straight and does not tilt. If the finial bottoms out before the shade is snug, add a small washer under it; if the shade still rocks, the harp size is wrong.
Getting the joint right matters as much here as it does in a pipe run: the methods used to connect PVC pipe and its fittings are about seating surfaces and snug joints, and the same principle applies to seating a shade on a harp.
To measure a spider shade, turn it upside down and measure the washer opening, then the distance from the washer to the shade rim along the slope. Most shades accept a standard harp stud, but larger shades need a taller harp.
Harp sizes are measured by the vertical distance from the base to the top of the U. A standard 6-inch harp suits most table lamps, while floor lamps often take a 9-inch or taller harp, and the shade depth should never exceed the harp height or the shade will rest on the bulb.
Uno and Euro Fitters: Socket-Mounted Options
Lamps without a harp need a fitter that mounts on the socket itself, and that is the uno and Euro territory. Both sit close to the bulb, which gives the lamp a lower, more compact profile.
Uno Fitters
An uno fitter has a threaded ring that screws onto the threads of the lamp socket. It is ideal for lamps without a harp and for small to medium shades that can clear the bulb.
Euro Fitters
A Euro fitter looks like a spider without prongs: a flat washer that sits on top of the socket. It suits shades made for European-style sockets and gives a clean, low profile.
Material matching matters at the socket because brass, steel, and aluminum parts meet in a small space, and the same compatibility logic that drives dielectric plumbing fittings for joining galvanized and copper pipes applies to avoiding corrosion between lamp metals.
Uno fitters come in standard socket sizes, and the threaded ring should spin onto the socket without forcing. If the ring binds, the socket is a different size or the threads are painted; check before ordering a stack of shades.
Clip-On Fitters and Specialty Shades
Clip-on fitters attach directly to the lightbulb with spring clips, which makes them the right choice for small shades, chandeliers, and fixtures with no harp and no accessible socket threads.
When Clip-On Works Best
Use clip-on shades where the bulb is exposed and the shade is light. The spring clips grip the bulb’s glass, so the shade must be small enough that the bulb supports its weight.
The attachment is deliberately tool-free, the way push-fit, crimp, and expansion PEX connections each use a different mechanism for a watertight joint. A clip-on shade uses friction and spring tension instead of threads.
Chandeliers use clip-on shades more than any other fixture type because each candle socket is small and unthreaded. The clips also make bulb changes easy, since the shade lifts off with the bulb.
Clip tension varies by manufacturer, and a clip that is too stiff can crack the bulb. Test the fit on a spare bulb before you commit, and choose shades with a rolled wire edge, which grips more gently than a raw metal edge.
Sizing, Washers, and Getting the Fit Right
Before ordering a shade, measure the lamp, not the old shade. The fitter type, the harp height, and the socket position all decide which shade fits.
How to Measure a Lamp
- Note whether the lamp has a harp and measure its height.
- Check whether the socket is threaded, for an uno fitter, or smooth, for a Euro fitter.
- Measure the clearance from the socket to the widest point of the bulb.
- Pick the fitter type that matches the lamp, then choose the shade by fitter size and overall diameter.
Replacement washers and finials are sold separately, which is useful when you keep the lamp and only change the shade. Measure the harp stud thread before buying a new finial; the standard size is common, but imports vary.
Match the Metals for a Clean Look
Match the fitter finish to the lamp base for a cohesive look, and keep the same finish rule across the room. When metals must differ, the same material-separation logic behind joining dissimilar metal pipes safely keeps the joint clean and corrosion-free.