7/8" - 2 Double Lead Acme

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7/8" - 2 Double Lead Acme

7/8" - 2 Double Lead Acme

This 7/8 – 2 Double lead acme machine screw is available in both alloy steel and stainless steel with a corresponding aluminum bronze nut. Choose from right-hand or left-hand threads.

MACHINE SCREW SPECIFICATIONS RH LH
ALLOY STEEL SCREW PART NO. AS 088 R 050 A AS 088 L 050 A
STAINLESS STEEL SCREW PART NO. AS 088 R 050 S AS 088 L 050 S
THREAD FORM ACME
SCREW DIAMETER (TURNS / INCH) 7/8" - 2
PITCH / LEAD 0.250 IN./0.500 IN.
ROOT DIAMETER 0.574 IN.
SCREW WEIGHT (LBS. / FOOT) 1.7
TORQUE TO RAISE 1 POUND 0.132 IN.- LB.
MAXIMUM SCREW LENGTH 12 FEET

Nut and Flange Specifications

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NUT SPECIFICATIONS RH LH
NUT PART NO. AN 088 R 050 B AN 088 L 050 B
NUT WITH FLANGE PART NO. AF 088 R 050 AF 088 L 050
DYNAMIC LOAD CAPACITY (LBS.) 3,828
STATIC LOAD CAPACITY (LBS.) 12,250
EFFICIENCY 61.5%
MATERIAL BRONZE
NOMINAL DIAMETER "A" 1.50 IN.
NUT LENGTH "B" 1.50 IN.
THREAD LENGTH "C" 0.50 IN.
THREAD SIZE 1.375-16 UN
FLANGE PART NO. FL-1375
FLANGE DIAMETER "D" 2.75 IN.
FLANGE THICKNESS "E" 0.52 IN.
FLANGE HOLE DIAMETERr "F" 0.266 IN.
NUMBER OF HOLES IN FLANGE "G" 4
FLANGE BOLT CIRCLE "H" 2.260 IN.
FLANGE MATERIAL BLACK OXIDE COATED STEEL

2D/3D Drawings

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Product Media

2D/3D DRAWINGS1"-1 DATA SHEET SB BEARING BLOCKS AND SCREW ENDS DB BEARING BLOCKS AND SCREW ENDS FB BEARING BLOCKS AND SCREW ENDS EFFECT OF CHANGE IN PARAMETERS SCREW & NUT CALCULATOR
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  • Alloy steel or stainless steel 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.

SB Bearing Blocks

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Screw Number Bearing Mount No. A B C D E F G H I J K
AS075R020A SB-12 3.000 1.875 1.000 0.375 1.125 1.125 2.250 0.672 1.344 .281 (4x) .406 Thru
AS088R050A .625 C'Bore
  .875 Deep

DB Bearing Blocks

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Screw Number Bearing Mount No. A B C D E F G H I J K L
AS075R020A DB-12 3.000 1.875 1.000 0.375 1.125 1.125 2.250 0.672 1.344 .281 (4x) .406 Thru N/A
AS088R050A .625 C'Bore
  .875 Deep

FB Bearing Blocks

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Screw Number Bearing Mount No. A B C D E F G H I J K L
AS075R020A FB-12 3.000 1.875 1.000 1.125 4.262 0.438 2.250 1.688 1.063 2.125 .250 Thru .406 Thru
AS088R050A .375 C'Bore .625 C'Bore
  #5 Taper Pin 1.130 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
AS075R020A SB-12 0.4726 0.890 0.450 0.56 0.127 0.472 1.029 1.25 .469-32 UNS W-01 N-01 6301
AS088R050A 0.4723 0.125

DB Screw End Conditions

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Screw Number Bearing Mount No. oS1 oS2 A1 A2 A3 A4 A5 A6 A7 A8 A9
AS075R020A DB-12 0.4726 0.406 3.29 2.00 1.566 0.472 0.000 .469-32 UNS W-01 N-01 1/8 x 5/8
AS088R050A 0.4723 0.405

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
AS075R020A FB-12 0.4726 0.406 4.30 3.00 2.35 1.850 0.472 0.923 0.038 .469-32 UNS W-01 N-01 1/8 x 5/8
AS088R050A 0.4723 0.405
 
 
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