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SFK Short Nut CNC Ballscrew
SFK is a short-bodied flanged ball screw family covering shaft diameters from 4 mm to 25 mm. The series is useful when the nut must fit inside a narrow carriage, but its flange and body dimensions still need to be checked model by model.
Description
Product Details
The flange is the connection point between the nut and the moving machine part. Its outside profile, thickness and hole positions are given by the A, B, W, H and X columns in the specification drawing. D and L define the space occupied by the nut body.
Two housing layouts are shown. The first covers screw diameters up to 16 mm. The second is used for the 20 mm and 25 mm assemblies and adds Y and Z mounting references together with an M6 lubrication port.
The product photographs show the standard nut form. Final shaft length, bearing journals, coupling journal and threads depend on the end-machining drawing supplied with the order.
Product Description
Machine the nut pocket from the selected model row, leaving access to the flange fasteners. The carriage must not press against the cylindrical nut body after tightening.
Keep the lubricating position accessible on the larger nut sizes. If the port faces a closed side of the carriage, routine servicing will require removal of the assembly.
Nuts are supplied without seals as standard. The published sheet states that the 4 mm and 6 mm sizes have no seals. Models carrying an asterisk may also be produced with a left-hand helix.
Ca, Coa and K are reference values for dynamic load, static load and rigidity. They do not replace a check of the working load, travel rate and support arrangement.
Product Information
| Item | Specification |
|---|---|
| Series | SFK |
| Assembly | Screw shaft and flanged nut |
| Shaft Diameter | 4–25 mm |
| Lead Range | 1–5 mm |
| Nut Body Diameter | 10–50 mm |
| Nut Length | 12–55 mm |
| Lubrication Port | M6 on 20 mm and 25 mm sizes |
| Standard Seal Condition | Supplied without seals |
| Shaft End Work | Produced from the submitted drawing |
FAQ
Which drawing applies to SFK1602?
Use the (d \leq 16) drawing because SFK1602 has a 16 mm screw diameter.
What does the Q dimension represent?
Q identifies the lubrication port shown on the larger nut drawing. The listed thread is M6.
Can dimensions be measured from the product image?
No. Use the numerical row belonging to the complete SFK model.
What does the asterisk beside a model mean?
It indicates that a left-hand helix version can be produced for that designation.
Can the shaft ends be made from a machine drawing?
We build to customer drawings under OEM/ODM, and accept orders as small as a single piece for standard sizes.
About Us
Lishui Guangyuan Industry & Trade Co Ltd supplies ball screw assemblies with model-based nut dimensions and drawing-based shaft-end machining.
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