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DFARS Specialty Metals
Export Control Classification Number (ECCN)
Steel Socket Head Screws
 |
Fully Threaded |
 |
Partially Threaded |
Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.
Length is measured from under the head.
Black-Oxide Alloy Steel—Best for dry environments since moisture will cause these screws to rust. They have a dark, matte appearance.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Threading | Thread Spacing | Tensile Strength, psi | Pkg. Qty. | Pkg. | |||
Black-Oxide Alloy Steel | ||||||||||
2 1/2"-4 | ||||||||||
| 4" | 3 3/4" | 2 1/2" | Fully Threaded | Coarse | 170,000 | 1 | 90044A231 | 0000000 | ||
| 6" | 3 3/4" | 2 1/2" | Fully Threaded | Coarse | 170,000 | 1 | 90044A232 | 000000 | ||
| 8" | 3 3/4" | 2 1/2" | Partially Threaded | Coarse | 170,000 | 1 | 90044A233 | 000000 | ||
| 10" | 3 3/4" | 2 1/2" | Partially Threaded | Coarse | 170,000 | 1 | 90044A234 | 000000 | ||
Acme Lead Screws and Nuts
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Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Lead Screws—Right-Hand Thread
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Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Alloy Steel—Alloy steel components are harder and stronger than carbon steel components.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.
Thread Size | Thread Type | Lg. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Fastener Strength Grade/Class | Hardness | Tensile Strength, psi | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | ||||||||||||||
| 2 1/2"-4 | Acme | 12" | 1 | 1:1 | 0.25" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 98935A785 | 000000 | ||
| 2 1/2"-4 | Acme | 3 ft. | 1 | 1:1 | 0.25" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 64,000 | ASTM A108 | 98935A901 | 000000 | ||
| 2 1/2"-4 | Acme | 6 ft. | 1 | 1:1 | 0.25" | Acme Class 2G | SAE Grade 2 | Rockwell B61 | 53,000 | ASTM A108 | 98935A215 | 000000 | ||
Alloy Steel | ||||||||||||||
| 2 1/2"-4 | Acme | 3 ft. | 1 | 1:1 | 0.25" | Acme Class 2G | ASTM Grade B7 | Rockwell C35 | 125,000 | ASTM A193 | 93410A681 | 000000 | ||
Coupling Nuts—Right-Hand Thread
 |
Coupling nuts connect two lead screws.
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.
Thread Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | |||||||||||||
| 2 1/2"-4 | Acme | 5" | 3 1/2" | 1 | 1:1 | 0.25" | Acme Class 2G | Rockwell B75 | Not Rated | 93023A327 | 0000000 | ||
Hex Nuts—Right-Hand Thread
 |
Hex nuts fasten and position lead screw components.
Carbon Steel—Carbon steel components are easier to machine than alloy steel components.
Zinc-Plated Carbon Steel—Zinc-plated carbon steel components have mild corrosion resistance and are easier to machine than alloy steel components.
360 Brass—360 brass components have excellent machinability and good corrosion resistance.
18-8 Stainless Steel—18-8 stainless steel components have good corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.
Thread Size | Thread Type | Ht. | Wd. | No. of Thread Starts | Speed Ratio | Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon Steel | ||||||||||||||
| 2 1/2"-4 | Acme | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Acme Class 2G | Rockwell B75 | Not Rated | — | 94815A115 | 0000000 | ||
Zinc-Plated Carbon Steel | ||||||||||||||
| 2 1/2"-4 | Acme | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Acme Class 2G | Rockwell B75 | Not Rated | — | 98948A133 | 000000 | ||
360 Brass | ||||||||||||||
| 2 1/2"-4 | Acme | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Acme Class 2G | Rockwell B75 | Not Rated | ASTM B16 | 95155A179 | 000000 | ||
18-8 Stainless Steel | ||||||||||||||
| 2 1/2"-4 | Acme | 2 1/2" | 3 1/2" | 1 | 1:1 | 0.25" | Acme Class 2G | Rockwell B97 | Not Rated | — | 95066A195 | 000000 | ||
Eyebolts—For Lifting
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 |  |
With Shoulder | Without Shoulder |
With Shoulder—Use for lifting at angles up to 45° or for vertical lifting. Because angular lifting significantly reduces the eyebolt’s capacity, we recommend hoist rings for heavy loads.
Without Shoulder—For vertical lifting only.
Zinc-Plated Steel
 |  |
With Shoulder | Without Sholder |
Zinc-plated steel eyebolts offer good corrosion resistance.
With Shoulder—Use for lifting at angles up to 45° or for vertical lifting. Because angular lifting significantly reduces the eyebolt’s capacity, we recommend hoist rings for heavy loads.
Without Shoulder—For vertical lifting only.
Precision Acme Lead Screws and Nuts
 |
Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.
Lead Screws—Right-Hand Thread
|  |
Right-Hand Threads |
1018 Low-Carbon Steel—Carbon steel lead screws and flanges have good machinability.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
Thread Size | Lg., ft. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Accuracy for Travel Distance per Turn | Thread Fit | Hardness | Tensile Strength, psi | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1018 Low-Carbon Steel | |||||||||||||
| 2 1/2"-4 | 3 | Acme | 1:1 | 1 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 126 | 64,000 | 99030A065 | 0000000 | ||
| 2 1/2"-4 | 6 | Acme | 1:1 | 1 | 0.25" | ±0.009"/1 ft. | Acme Class 2C | Brinell 126 | 64,000 | 99030A165 | 000000 | ||
Externally Threaded Nuts—Right-Hand Thread
 |
Combine externally threaded nuts with a flange to create a custom flange nut.
673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
External Thread | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Dia. | Thread Type | Speed Ratio | No. of Thread Starts | Travel Distance per Turn | Size | Lg. | Thread Fit | Hardness | Tensile Strength | Dynamic Thrust Load Cap. | Each | |||
673 Bronze | ||||||||||||||||
| 2 1/2"-4 | 3 3/8" | 3.375" | Acme | 1:1 | 1 | 0.25" | 3 9/64"-12 | 1 9/16" | Acme Class 2C | Brinell 70 | Not Rated | Not Rated | 95072A123 | 0000000 | ||
Flanges
 |  |
Flange Thread Size | Flange Dia. | Flange Thk. | Bolt Circle Dia. | Flange Hardness | Each | |||
|---|---|---|---|---|---|---|---|---|
1117 Carbon Steel | ||||||||
| 3 9/64"-12 | 5 3/8" | 1 37/64" | 4 3/8" | Brinell 156 | 95082A647 | 0000000 | ||
Hoist Rings—For Lifting
 |
 |
180° Pivot |
 |
360° Swivel |
Designed for angular lifting, hoist rings resist stresses that would bend or break an eyebolt. They have a lifting ring that pivots 180° front to back and a base that swivels 360° to compensate for pitch, roll, and sway when lifting heavy or unbalanced loads. Install the base of the hoist ring flush to the mounting surface and tighten to the recommended torque that is stamped on the ring. Torque wrenches are sold separately.
Note: Capacities listed are for vertical lifting only. As the lift angle changes from vertical, the amount of weight the hoist ring can lift is significantly reduced. For example, when lifting a 1,000 lb. load at a 45° angle, you must choose a hoist ring with a capacity of at least 1,400 lbs. Do not use at an angle less than 30°.
Warning: Never use to lift people or items over people.
Machined—Machined hoist rings have a smooth finish to protect slings and hooks from damage and excess wear during lifting.
Black-Oxide Steel—Black-oxide steel hoist rings have mild corrosion resistance.
CE Marked—Hoist rings that are CE marked meet European safety standards.
Each | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Lg. | Inside Wd. | Overall Ht. | Vert. Cap., lb. | Movement | Specs. Met | Certification | Mil. Spec. | 1-9 | 10-Up | |||
Machined Black-Oxide Steel | |||||||||||||
| 2 1/2"-4 | 4" | 6" | 20 7/8" | 50,000 | 180° Pivot and 360° Swivel | ASME B30.26 | CE Marked, Mil. Spec. | MIL-STD-1365, MIL-STD-209 | 3052T75 | 000000000 | 000000000 | ||
