The DLY SFU1204-4 ball screw is a compact flanged single-nut ball screw with a 12 mm nominal shaft diameter and 4 mm lead. One screw revolution produces 4 mm of linear travel, making this model suitable for compact equipment that requires a balance between positioning resolution, travel speed and installation size.
Standard supply uses a rolled S55C screw shaft with C7 accuracy and a 20CrMo ball nut. C5 ground accuracy, custom screw length, end machining and matching support units can be supplied according to the application and installation drawing.
How the SFU1204 Model Code Is Read
| Code | Meaning | SFU1204-4 Value |
|---|---|---|
| SFU | Standard flanged single-nut ball screw series | SFU structure |
| 12 | Nominal screw shaft diameter | 12 mm |
| 04 | Lead per screw revolution | 4 mm |
| -4 | Number of ball circuits | 4 circuits |
SFU1204 Ball Screw Dimensions
The following dimensions refer to the standard SFU1204-4 flanged ball nut. Check the dimension symbols against the product drawing before designing the nut mounting seat.
| Model | d | l | Da | D | A | B | L | W | X | H | N |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SFU1204-4 | 12 | 4 | 2.381 | 24/22 | 40 | 10 | 40 | 32 | 4.5 | 30 | 4 |
Dimension unit: mm. d = nominal shaft diameter; l = lead; Da = ball diameter; D = nut body reference diameter; A = flange diameter; B = flange thickness; L = nut length; W = flange width; X = mounting-hole diameter; H = mounting-hole center dimension; N = number of ball circuits.
SFU1204 Ball Screw Load Ratings
| Performance Item | Catalog Value | Converted Value | Meaning |
|---|---|---|---|
| Dynamic load rating Ca | 593 kgf | Approx. 5.82 kN | Used when calculating nominal fatigue life under repeated motion |
| Static load rating Coa | 1129 kgf | Approx. 11.07 kN | Reference rating for stationary or peak axial loading |
| Axial stiffness K | 12.5 kgf/μm | Approx. 122.6 N/μm | Reference elastic resistance in the axial direction |
The kN and N/μm values are approximate conversions from the catalog kgf values. Actual service life depends on axial load, speed, stroke, lubrication, alignment and operating duty.
SFU1204 Ball Screw Materials and Accuracy
| Item | Standard Supply |
|---|---|
| Screw shaft material | S55C |
| Ball nut material | 20CrMo |
| Manufacturing method | Cold rolled screw shaft |
| Accuracy grade | C7,C5 |
| Thread direction | Right-hand,Left-hand subject to confirmation |
| Nut structure | Standard flanged single nut |
SFU1204 Ball Nut Marking
For repeat OEM and distributor orders, the ball nut can be marked with the model, batch code or approved customer identification. Marking content and position should be confirmed before production.
SFU1204 Ball Screw FAQ
Q: What do 12 and 04 mean in SFU1204?
A: The number 12 identifies the 12 mm nominal screw-shaft diameter, while 04 identifies the 4 mm lead. The nut therefore travels 4 mm for each complete screw revolution.
Q: What is the standard accuracy of the SFU1204 ball screw?
A: DLY commonly supplies the rolled SFU1204 in C7 accuracy. A precision-ground C5 version can be quoted when the application requires a higher accuracy grade.
Q: What are the load ratings of SFU1204-4?
A: The catalog dynamic load rating Ca is 593 kgf, approximately 5.82 kN. The static load rating Coa is 1129 kgf, approximately 11.07 kN. These ratings are reference values, not recommended continuous working loads.
Q: Can DLY machine the SFU1204 screw ends?
A: Yes. DLY can machine bearing seats, locknut threads, coupling journals, flats, keyways, grooves and other features according to a confirmed drawing.
Q: Which support units fit an SFU1204 ball screw?
A: BK/BF, FK/FF and EK/EF support arrangements are available, but the exact size must match the finished shaft-end dimensions. Send the support-unit model or shaft-end drawing for confirmation.
Q: Can SFU1204 be supplied with a left-hand thread?
A: Right-hand thread is the standard configuration. A left-hand version may be supplied subject to specification, quantity and production confirmation.
Request an SFU1204 Ball Screw Quote
Send the required screw length, effective stroke, quantity, accuracy grade, support-unit model and shaft-end drawing. DLY will confirm the SFU1204-4 specification before quotation.
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