As listed
| Field | Value |
|---|---|
| Seller | Yardstore |
| Seller's item # | 12490 |
| Maker | Sioux |
| Model | SDR4A27S8L |
| Speed | 2,700 RPM |
| Power | 0.4 hp |
| Air consumption | 21 CFM |
| Bits | 1/4"-28 threaded |
| Length | 9 1/2" |
| Weight | 1.92 lb |
| Made in | USA |
| Listing checked | 2026-09-29 |
Taken from Yardstore's product page on 2026-09-29. Where the listing does not state a figure, this table does not either.
What it is for
The head unscrews and swaps for 45°, 360°, low-profile 90° or heavy-duty 90° heads on the same motor, per the listing. The 21 CFM figure is the one to check against your compressor.
It takes the same 1/4"-28 thread as the countersink cutters and the Wescon microstop listed here. Hole sizes: drill chart.
Where to buy
The link opens Yardstore's own page for this item, so the price and stock you see are theirs and current. We do not copy prices.
The Aviation Point links to third-party manufacturer and distributor websites. We may earn a commission on purchases made through these links, at no additional cost to you. The Aviation Point has no partnership or affiliate agreement with Yardstore, and these links carry no tracking parameters.
Sources
- Yardstore — Sioux 90° 2700 RPM SDR4A27S8L Drill — product listing, item 12490, checked 2026-09-29.