How it connects
The female fixture base collar slips over the 3-inch OD male post or pier mount collar and is clamped securely in place using radial set screws or thumbscrews.
Male and female halves
Male cylindrical post or pier mount adapter collar mating inside a female post lantern base collar.
Usually connects to
Common sizes
- Nominal 3 in post, with listed ODs roughly 2-7/8–3 in (about 73–76.2 mm).
- Vertical collar height is typically 2–4 in.
Where it is used
residential landscape lightingpier mount lanternslamp postsoutdoor residential lightingcommercial exterior lightingpathway and driveway lighting
Variations
- 3 inch pier mount adapter
- 3 inch lamp post top
- wall bracket 3-inch post top adapter
- Pier-mount base collar
- Post top tenon adapter
- Integrated pole top tenon
How to recognise it
A smooth vertical cylindrical metal collar or tube with approximately 3 inch (74-76 mm) outer diameter on top of an outdoor light pole or square pier mount base.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Glass shade fitter | Glass shade fitters (e.g. 2-1/4 in, 3-1/4 in, 4 in lip fitters) hold glass globes/shades onto a light socket rather than securing a whole outdoor fixture to a post or pier. |
| Commercial lighting tenon mount | Commercial roadway/area lighting tenons are typically 2-3/8 inch OD pipe rather than 3 inch OD residential post top standards. |
| Female post light slip fitter | The female fitter is a hollow cup/collar with internal clearance to slide over a 3-inch pole or collar, typically equipped with threaded holes for set screws. |
| 2-3/8 inch slip fitter / tenon | Commercial floodlight and street light tenons commonly use 2-3/8 inch OD pipe rather than residential standard 3-inch OD. |
Also called
3 inch post top mount3 inch post light pier mount3 inch lamp post fitter maleoutdoor lamp post tenon3 inch post top tenon3 inch post mount fitter spigot3" light post top male collar3 inch pier mount adapter tenon
Good to know
In North American residential outdoor lighting, 3-inch OD is the ubiquitous standard pole/pier mount fitter size. The post/pier mount acts as the male spigot/tenon, while the lantern base has a female socket with set screw holes.
Related connections
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