2 1/2" - 4 Single Lead Acme

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2 1/2" - 4 Single Lead Acme

2 1/2" - 4 Single Lead Acme

This 2 1/2”-4 single lead acme machine screw is available in both alloy steel and stainless steel with a corresponding aluminum bronze nut. This is available with right-hand or left-hand threads.

Machine screw specifications RH LH
Alloy steel screw part no. AS 250 R 025 A AS 250 L 025 A
Stainless steel screw part no. AS 250 R 025 S As 250 L 025 S
Thread form  Acme
Screw diameter - turns/inch 2 1/2" - 4
Pitch/Lead 0.250 in.
Root diameter 2.193 in.
Screw weight (lb./ft.) 13.4
Torque to raise 1 pound 0.294 in.-lb.
Maximum screw length 20 feet*

*12 feet for stainless steel stock

Nut and Flange Specifications

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Nut specifications RH LH
Nut part number AN 250 R 025 B AN 250 L 025 B
Nut with flange AF 250 R 025  AF 250 L 025
Dynamic load capacity (lbs.) 40,000
Static load capacity (lbs.) 100,000
Efficiency 21.2%
Material Bronze
Nominal Diameter "A" 3.38 in.
Nut length "B" 3.38 in.
Thread length "C" 1.560 in.
Thread size 3.137-12 UN
Flange part number FL-3137
Flange diameter "D" 5.38 in
Flange thickness "E" 1.580 in.
Flange hole diameter "F" 0.656 in.
Number of holes in flange "G" 6
Flange Bolt Circle "H" 4.375 in.
Flange material black oxide coated steel

2D/3D Drawings

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Product Media

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  • Alloy steel or stainless screw
  • Aluminum bronze nut
  • Steel flange with black oxide coating

Sample Part Number:

Click on the part number to reveal additional information about the screw design and shaft codes.

Model Number

Thread Form

A: Acme
S: Stub Acme

Component

A: Assembly
S: Screw - without ball nut or bearing mounts

Screw Diameter - Thread direction - TPI (English)

Dia/TPI Code
1/2 – 8 050 R 013 (Stub Acme)
5/8 – 8 * 063 R 013 (Stub Acme)
5/8 – 4 * 063 R 025 (Stub Acme)
5/8 – 2 063 R 050 (Stub Acme)
3/4 – 5 * 075 R 013
7/8 – 2 * 088 R 050
1 –10 100 R 010
1 – 4 * 100 R 025
1 – 2 100 R 050
1 – 1 100 R 100 (Stub Acme)
1 1/4 – 4 125 R 025
1 1/2 – 4 150 R 025
1 1/2 – 2 2/3 150 R 038
1 1/2 – 2 2/3 * 150 R 038 (Stub Acme)
1 1/2 – 2 150 R 050
2 – 4 200 R 025
2 – 2 * 200 R 050
2 1/4 – 4 * 225 R 025
2 1/4 – 2 * 225 R 050
2 1/2 – 4 250 R 025
2 1/2 – 2 * 250 R 050
3 3/8 – 1 1/2 338 R 067 (Stub Acme)
3 1/2 – 1 1/2 350 R 067
3 3/4 – 1 1/2 375 R 067
4 1/2 – 1 1/2 450 R 067
5 – 1 1/2 500 R 067
6 – 1 1/3 600 R 075

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
Stub Acme screws offer a larger root diameter than their Acme counterparts
*Available in stainless steel

 

Screw Material

A: Alloy Steel
S: Stainless Steel

Note: not all threads or materials are available for all sizes

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

Nut Properties

B - Bronze
X - Do Not Include Nut in Assembly

Other Options

F - Include Flange
X - Do Not Include a Flange

Screw Length 000.00"

Enter value in inches with decimal if needed
Note that available screw length varies among screw sizes.

DB Bearing Blocks

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Screw Number Bearing Mount No. A B C D E F G H I J K L
AS250R025A DB-45 8.500 5.625 2.813 1.000 3.625 3.313 6.625 0.873 3.468 .813 (6x) 1.013 Thru 1.720
AS250R050A 1.563 C'Bore
  3.500 Deep

SB Screw End Conditions

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Screw Number Bearing Mount No. o S1 A1 A2 A3 A4 A5 A6 o A7 A8 A9 A10 A11
AS250R025A NA 1.7721 1.550 .960 .80 .315 .984 2.000 3.50 1.767-18 UNS W-09 N-09 6309
AS250R050A 1.7716 .313

DB Screw End Conditions

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Screw Number Bearing Mount No. oS1 oS2 A1 A2 A3 A4 A5 A6 A7 A8 A9
AS250R025A DB-45 1.7721 1.375 6.68 4.49 3.875 .984 .063 1.767-18 UNS W-09 N-09 5/16 x 1/12
AS250R050A 1.7716 1.374

FB Screw End Conditions

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Screw Number Bearing Mount No. oS1 oS2 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11
AS250R025A  NA 1.7721 1.375 8.62 6.37 5.60 4.694 .984 2.75 .035 1.767-18 UNS W-09 N-09 5/16 x 1 1/2
AS250R050A 1.7716 1.374
 
 
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