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1/2" - 8 Single Lead Stub Acme

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

MACHINE SCREW SPECIFICATIONS	RH
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 SPECIFICATIONS	RH
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.

2D/3D Drawings

Product Media

2D/3D DRAWINGS 1/2"-8 DATA SHEET EFFECT OF CHANGE IN PARAMETERS ONLINE SCREW AND NUT CALCULATOR

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 Screw End Conditions

jack

Screw Number	Bearing Mount No.	o S1	A1	A2	A3	A4	A5	A6	o A7	A8	A9	A10	A11
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
	NA	0.3541	0.750	0.290	N/A	N/A	0.315	0.875	0.88	5/16-24 UNF	N/A	N/A	629

DB Screw End Conditions

jack

Screw Number	Bearing Mount No.	oS1	oS2	A1	A2	A3	A4	A5	A6	A7	A8	A9
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
	NA	0.3541	0.249	2.45	1.82	1.320	0.315	0.035	5/16-24 UNF	N/A	N/A	3/32 x 1/2

FB Screw End Conditions

jack

Screw Number	Bearing Mount No.	oS1	oS2	A1	A2	A3	A4	A5	A6	A7	A8	A9	A10	A11
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
	NA	0.3541	0.249	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

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