3 3/8" - 1 1/2 Single Lead Stub Acme
3 3/8" - 1 1/2 Single Lead Stub Acme
This 3 3/8”-1 1/2 single lead stub 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. | SS 338 R 067 A | SS 338 L 067 A |
| Stainless steel screw part no. | SS 338 R 067 S | SS 338 L 067 S |
| Thread form | Stub Acme | |
| Screw diameter - turns/inch | 3 3/8" -1 1/2 | |
| Pitch/Lead | 0.667 in. | |
| Root diameter | 2.902 in. | |
| Screw weight (lb./ft.) | 20.1 | |
| Torque to raise 1 pound | 0.314 in.-lb. | |
| Maximum screw length | 20 feet* | |
*12 feet for stainless steel stock
Nut and Flange Specifications
| Nut specifications | RH | LH |
|---|---|---|
| Nut part number | SN 338 R 067 B | SN 338 L 067 B |
| Nut with flange | SF 338 R 067 | SF 338 L 067 |
| Dynamic load capacity (lbs.) | 40,000 | |
| Static load capacity (lbs.) | 100,000 | |
| Efficiency | 34.7% | |
| Material | Bronze | |
| Nominal Diameter "A" | 4.50 in. | |
| Nut length "B" | 4.50 in. | |
| Thread length "C" | 2.00 in. | |
| Thread size | 4.325-12 UN | |
| Flange part number | FL-4325 | |
| Flange diameter "D" | 7.38 in | |
| Flange thickness "E" | 2.020 in. | |
| Flange hole diameter "F" | 0.781 in. | |
| Number of holes in flange "G" | 6 | |
| Flange Bolt Circle "H" | 6.250 in. | |
| Flange material | black oxide coated steel | |
Custom End Conditions are available for this screw. Contact Joyce/Dayton for more information.
2D/3D Drawings
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Product Media
- 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.