These are heavy duty three-legged Middle Frame Fittings for three 3.5in OD metal pipe legs and a 3.5in OD metal pipe top swing beam. You will need Schedule 40, 3in ID pipe for your swingset, which is 3.5in OD. National Test Lab Results: 5000 lbs. Commercial Grade, These fittings include all the hardware required to attach to the 4 pipes.

To build your own metal swingset you will need (1) Middle Frame Fitting
if you want more than two swings.

Pipe Leg Lengths Needed for Different Swing Beam Heights (Leaves approximately 2ft of pipe in the ground)
Beam Height	Leg Length Needed
8ft High	10.66ft
9ft High	11.74 ft.
10ft High	12.82 ft.
11ft High	13.91 ft.
12ft High	14.99 ft.

Each 2 swing position beam should be at least 9ft in width.    Schedule 40, 3 Inch ID pipe is recommended.   Schedule 40, 3" pipe is 3" inside diameter and 3.5in outside diameter.

The price below is for 1 Middle frame fitting. You normally need one Middle Frame Fitting for a free standing metal swing set for 3 to 4 swings.

3 Leg Metal Middle Frame Fitting - 2-3/8th OD - ID#:JSP-MFF-33 Mfg'd By: Jensen Swing Products Inc.  SKU#:MFF-33
Color Choice:	Red Green
Regular Price: $219.99 Sales Price: $159.95 You Save $60.04 or 27.29%	Availability: Usually ships in about 1-2 weeks.