1/2" - 8 Single Lead Stub Acme

This 1/2 - 8 stub acme machine screw is available in both alloy steel and stainless steel with a corresponding aluminum bronze nut. Right hand threads are available.

MACHINE SCREW SPECIFICATIONSRH
ALLOY STEEL SCREW PART NO.SS 050 R 013 A
STAINLESS STEEL SCREW PART NO.SS 050 R 013 S
THREAD FORM STUB ACME
SCREW DIAMETER-TURNS / INCH 1/2 - 8
PITCH / LEAD 0.125 IN.
ROOT DIAMETER 0.38 IN.
SCREW WEIGHT (LB. / FT.) 0.53
TORQUE TO RAISE 1 POUND 0.050 IN - LB
MAXIMUM SCREW LENGTH 12 FEET

 

Nut and Flange Specifications

NUT SPECIFICATIONSRH
NUT PART NO.SN 050 R 013 B
NUT WITH FLANGE PART NO.SF 050 R 013
DYNAMIC LOAD CAPACITY (LBS) 1,250
STATIC LOAD CAPACITY (LBS) 4,000
EFFICIENCY 40.5%
MATERIAL BRONZE
NOMINAL DIAMETER "A" 1.12 iIN.
NUT LENGTH "B" 0.75 IN.
THREAD LENGTH "C" 0.50 IN.
THREAD SIZE 0.937-16 UN
FLANGE PART NO.FL-0937
FLANGE DIAMETER "D" 2.60 IN.
FLANGE THICKNESS "E" 0.53 IN.
FLANGE HOLE DIAMETER "F" 0.266 IN.
NUMBER OF HOLES IN FLANGE "G" 4
FLANGE BOLT CIRCLE "H" 2.090 IN.
FLANGE MATERIAL STEEL

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

 Bearing Blocks are not 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 Screw End Conditions

Screw NumberBearing Mount No.o S1A1A2A3A4A5A6o A7A8A9A10A11
SS050R013A  NA 0.3544 0.750 0.290 N/A N/A 0.315 0.875 0.88 5/16-24 UNF N/A N/A 629
  0.3541

DB Screw End Conditions

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9
SS050R013A  NA 0.3544 0.250 2.45 1.82 1.320 0.315 0.035 5/16-24 UNF N/A N/A 3/32 x 1/2
  0.3541 0.249

FB Screw End Conditions

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9A10A11
SS050R013A  NA 0.3544 0.250 3.23 2.60 1.98 1.240 0.315 0.063 0.035 5/16-24 UNF N/A N/A 3/32 x 1/2
  0.3541 0.249

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