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 specificationsRH
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 specificationsRH
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

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   2.500" x .500" Data Sheet

 

   SB Bearing Blocks and Screw Ends

 

   DB Bearing Blocks and Screw Ends

 

   FB Bearing Blocks and Screw Ends

 

   Standard Ball Nut, Flange, Wiper Kit

 

   Effect of Change in Parameter

 

   2D/3D Drawings


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. 

Construction

  • 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.

Ordering Information

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.

 

Product Specifications

SB Screw End Conditions

Screw NumberBearing Mount No.oS1A1A2A3A4A5A6o A7A8A9A10A11
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 NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9
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 NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9A10A11
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

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