$377 to $593.30 (Sportaid)
Carbon Fiber Solid Seat Base
Solid seat inserts. Flat carbon fiber seat pan with aluminium mounting hardware that replaces a sling seat on rigid frames.
Therafin
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Therafin · Solid seat inserts · AC-273
Therafin Drop Seat Insert solid seat board
The Therafin Drop Seat Insert is a solid seat board for wheelchairs that replaces the sling and can be hung below the seat rails on drop hooks. It is cut from half-inch nine-ply birch, painted black, and arrives pre-drilled, including holes for an abductor and for hinges. Sixteen quarter-twenty T-nuts are supplied to place where the hardware needs them. Drop hooks, rail locks and swing tabs are ordered separately.
- Material
- 9-ply birch plywood
- Thickness
- 1/2 in
- Finish
- Painted black
- Included
- 16 quarter-20 T-nuts
Therafin Drop Seat Insert key features
- Half-inch 9-ply birch plywood, painted black
- Pre-drilled, including abductor and hinge holes
- 16 quarter-20 T-nuts supplied
- Versions for chair widths from 10 to 20 in
- X-Long versions for 14, 16 and 18 in chairs
- Drop hooks and rail hardware ordered separately
Who the Therafin Drop Seat Insert suits
Suits seating technicians and therapists who build a solid or lowered seat on a wheelchair, for example to gain foot-propelling height or a stable base under a contoured cushion. Selection and setup should be done with a clinician.
Therafin Drop Seat Insert specifications
| Material | 9-ply birch plywood |
|---|---|
| Thickness | 1/2 in |
| Finish | Painted black |
| Included | 16 quarter-20 T-nuts |
| Chair widths | 10, 12, 13, 14, 15, 16, 17, 18, 19 and 20 in |
| X-Long versions | 14, 16 and 18 in |
| Not included | Drop hooks, rail locks, swing tabs |
| SKU (16 in) | 31651 |
| Maker country | USA |
| Brand | Therafin |
| Category | Seat cushions, Solid seat inserts |
| Catalog ID | AC-273 |
Compared with the source page on 5 October 2026. Details can change, so we confirm them in your quote. Open the source page.
Therafin Drop Seat Insert: common questions
Are the drop hooks included?
No. Drop hooks, rail locks and swing tabs are sold separately.
What is it made of?
Half-inch nine-ply birch plywood with a black painted finish.
Which sizes are available?
Versions are listed for chairs from 10 to 20 inches wide, plus extra-long versions for 14, 16 and 18 inch chairs.
How to get a quote for the Therafin Drop Seat Insert
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