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 SPECIFICATIONSRH LH
ALLOY STEEL SCREW PART NO.AS 088 R 050 AAS 088 L 050 A
STAINLESS STEEL SCREW PART NO.AS 088 R 050 SAS 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


NUT SPECIFICATIONSRH LH
NUT PART NO.AN 088 R 050 BAN 088 L 050 B
NUT WITH FLANGE PART NO.AF 088 R 050AF 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


Click on Product Specifications below to view Bearing Block and Screw End Conditions options available for this screw.

  • Alloy 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.

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

Screw NumberBearing Mount No.ABCDEFGHIJK
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

Screw NumberBearing Mount No.ABCDEFGHIJKL
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

Screw NumberBearing Mount No.ABCDEFGHIJKL
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

Screw NumberBearing Mount No.o S1A1A2A3A4A5A6o A7A8A9A10A11
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

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9
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

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9A10A11
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

Files must be less than 2 MB.
Allowed file types: gif jpg png tif pdf dwg jpeg jax.
Files must be less than 2 MB.
Allowed file types: gif jpg png tif pdf dwg jpeg jax.

Request a quote for products and repair parts:

  • New Product Quote: Visit the product sections on this website and select or construct a part number and quantity of the product you wish to purchase.
  • Reorder a Product: Include the previous PO or serial number along with the quantity you need.
  • Repair Parts: View the product manual or exploded view to identify the components that are needed. Locate the product serial number and include it in your correspondence with Customer Service.

If you need us to repair your product, request a Returned Goods Authorization (RGA) number by email, phone, or simply fill out the form above and mention "RGA" in message box.

sales@joycedayton.com
937-297-7173 (fax)
937-294-6261 (telephone) 800-523-5204 (toll free, U.S. & Canada)

By submitting this form, I agree to the Joyce/Dayton Website Usage Terms and ConditionsPrivacy Policy, and that a Joyce/Dayton representative may contact me.

CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.