1-800-523-5204 or 1-937-294-6261
2.500 In. Diameter - 0.500 In. Lead
This 2.500 inch diameter ball screw has a 0.500 inch lead. Corresponding standard capacity ball nuts with right-hand threads are available.
Ball screw specifications | RH |
---|---|
Ball screw part no. | BS 250 R 050 A |
Nominal ball circle diameter | 2.500 in. |
Lead | 0.500 in. |
Screw diameter | 2.540 in. |
Root diameter | 2.220 in. |
Screw weight | 14.98 lb./ft. |
Torque to raise 1 pound* | 0.089in.-lb. |
Maximum screw length | 24 ft. |
* Torque to raise 1 pound = 0.177 x inches lead x pounds load
Standard Capacity Ball Nut Specifications (S)
Ball nut specifications | RH |
---|---|
Ball nut part no. (standard capacity) | BN 250 R 050 S |
Ball nut with flange part no. | BF 250 R 050 S |
Dynamic load capacity** | 22,000 lb. |
Static load capacity | 155,500 lb. |
Ball nut weight | 12.09 lb. |
Nominal ball dia. (avg. ball qty.) | 3/8 in. (186) |
Flange part no. | FL-3625 |
Wiper kit part no. | WK-70 |
** for 1,000,000 inches
Click on Product Specifications below to view Screw End Conditions, and Wiper Kit options available for this screw. Standard Bearing Block Supports are not available for this size ball screw.
- Ball screws are made from alloy steel and case hardened to Rc56 (minimum).
- A black oxide finish is applied to prevent corrosion during shipping and for a brief storage period.
- The rust inhibiting properties of the screw lubricant offers additional corrosion resistance.
- Ball nut housings are steel with case hardened threads. A black oxide coating provides additional protection.
- Flanges are constructed of steel with a black oxide coating.
Sample Part Number:
Click on the part number to reveal additional information about the ball screw design and shaft codes.
Thread Form
B: Ball Screw
Component
A: Assembly
S: Screw - without ball nut or bearing mounts
Screw Diameter - Thread direction - TPI (English)
Dia/TPI | Code |
---|---|
5/8 - .200* | 063 R 020 |
3/4 - .200 | 075 R 020 |
3/4 - .500 | 075 R 050 |
1 - .250* | 100 R 025 |
1 - .500 | 100 R 050 |
1 - 1.000 | 100 R 100 |
1 1/2 - .500 | 150 R 050 |
1 1/2 - 1.00 | 150 R 100 |
1 1/2 - 1.875 | 150 R 188 |
2 1/4 - .500 | 225 R 050 |
2 1/2 - .500 | 250 R 050 |
3 - .660 | 300 R 066 |
4 - 1.000 | 400 R 100 |
R – Right-hand – all thread diameters/leads are available with right hand threads
L – Left-hand *- Substitute an ”L” in the part number for left hand leads
Screw Material
A: Alloy Steel
First End of Screw
(Flange or threaded end of nut always faces second end)
Bearing Mount Options | Machining Options (choose one that corresponds to the bearing block) |
---|---|
SB - Simple Single* | 1N – Threaded shaft only |
DB - Simple Double | 2K – Thd Shaft w Kwy, 2L – Thd Shaft no Kwy, 2N – Threaded shaft only |
FB - Fixed Double | 3K – Thd Shaft w Kwy, 3L – Thd Shaft no Kwy, 3N – Threaded shaft only |
XX - No Bearing | 4K – Shaft w Keyway, 4L – Shaft no Keyway, 4N – Support only, XX – No Machining |
(When selecting ”XX – No Bearing”, choose from mounting options 1K through 4N or XX, above)
* All Simple Single bearing mounts are designed for radial loads only
Second End of Screw
(Flange or threaded end of nut always faces away from second end)
Bearing Mount Options | Machining Options (choose one that corresponds to the bearing block) |
---|---|
SB - Simple Single* | 1N – Threaded shaft only |
DB - Simple Double | 2K – Thd Shaft w Kwy, 2L – Thd Shaft no Kwy, 2N – Threaded shaft only |
FB - Fixed Double | 3K – Thd Shaft w Kwy, 3L – Thd Shaft no Kwy, 3N – Threaded shaft only |
XX - No Bearing | 4K – Shaft w Keyway, 4L – Shaft no Keyway, 4N – Support only, XX – No Machining |
(When selecting ”XX – No Bearing”, choose from mounting options 1K through 4N or XX, above)
* All Simple Single bearing mounts are designed for radial loads only
Ball Nut Properties
S - Standard Capacity
H - High Capacity
U - Ultra Capacity
X - No ball nut
Other Options
F - With Flange
B - With Flange and Wipers
W - Wipers
X - No Options
Screw Length 000.00"
Enter value in inches with decimal if needed
Note that available screw length varies among screw sizes.
SB Screw End Conditions
Screw Number | Bearing Mount No. | oS1 | A1 | A2 | A3 | A4 | A5 | A6 | o A7 | A8 | A9 | A10 | A11 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
BS250R050A | 2.1659 | 1.770 | 1.120 | 0.86 | 0.315 | 1.142 | 2.225 | 4.13 | 2.157-18 UNS | W-11 | N-11 | 6311 | |
2.1653 | 0.313 |
DB Screw End Conditions
Screw Number | Bearing Mount No. | oS1 | oS2 | A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 | A9 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
BS250R050A | 2.1659 | 1.875 | 8.40 | 5.40 | 4.700 | 1.142 | 0.063 | 2.157-18 UNS | W-11 | N-11 | 1/2 x 1 1/2 | |
2.1653 | 1.874 |
FB Screw End Conditions
Screw Number | Bearing Mount No. | oS1 | oS2 | A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 | A9 | A10 | A11 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
BS250R050A | 2.1659 | 1.875 | 10.10 | 7.35 | 6.50 | 5.608 | 1.142 | 3.350 | 0.035 | 2.157-18 UNS | W-11 | N-11 | 1/2 x 1 1/2 | |
2.1653 | 1.874 |