System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Thread Size Thread Size | Hide |
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Material Material |
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Finish Finish |
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Drive Style Drive Style |
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| External Hex | Hex | Phillips |
Threading Threading |
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 | Fully Threaded |
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Thread Direction Thread Direction |
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 | Right Hand |
Socket Head Profile Socket Head Profile |
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 | Standard |
Tensile Strength Tensile Strength |
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Flat Head Profile Flat Head Profile |
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 | Standard |
About Nuts, Materials, and Finishes
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About Set Screws
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About Rounded Head Screws
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About Flat Head Screws
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About Socket Head Screws
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About Helical Insert Length
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How to Install Helical Inserts
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Alloy Steel Socket Head Screws
With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head.
Black-oxide steel screws are mildly corrosion resistant in dry environments. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance. They are not compatible with coarse threads.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
3-56 | |||||||||||
Black-Oxide Alloy Steel | |||||||||||
| 1/8" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 10 | 000000000 | 000000 |
| 3/16" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
| 1/4" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
| 5/16" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
| 1" | Partially Threaded | 5/8" | Fine | 0.161" | 0.099" | 5/64" | 170,000 | ASTM A574 | 5 | 000000000 | 0000 |
18-8 Stainless Steel Socket Head Screws
Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Pkg. Qty. | Pkg. | |
3-56 | |||||||||
18-8 Stainless Steel | |||||||||
| 1/8" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 100 | 000000000 | 00000 |
| 3/16" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 100 | 000000000 | 0000 |
| 1/4" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 25 | 000000000 | 0000 |
| 5/16" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 50 | 000000000 | 0000 |
| 3/8" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 25 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 50 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 50 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Fine | 0.161" | 0.099" | 5/64" | 70,000 | 50 | 000000000 | 0000 |
18-8 Stainless Steel Button Head Hex Drive Screws
18-8 stainless steel button head screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head.
Passivated stainless steel screws provide added protection against oxidation and corrosion.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Finish | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
3-56 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/4" | Fully Threaded | 0.188" | 0.052" | 1/16" | Passivated | 70,000 | ASME B18.3 | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.188" | 0.052" | 1/16" | Passivated | 70,000 | ASME B18.3 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.188" | 0.052" | 1/16" | Passivated | 70,000 | ASME B18.3 | 10 | 000000000 | 0000 |
Alloy Steel Button Head Hex Drive Screws
Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws. Length is measured from under the head.
Black-oxide alloy steel screws are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Alloy Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
3-56 | |||||||||
| 1/4" | Fully Threaded | 0.188" | 0.052" | 1/16" | 120,000 | ASME B18.3, ASTM F835 | 10 | 000000000 | 00000 |
| 3/8" | Fully Threaded | 0.188" | 0.052" | 1/16" | 120,000 | ASME B18.3, ASTM F835 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.188" | 0.052" | 1/16" | 120,000 | ASME B18.3, ASTM F835 | 10 | 000000000 | 0000 |
18-8 Stainless Steel Pan Head Phillips Screws
18-8 stainless steel pan head screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head. Partially threaded screws thread length may vary from the minimum thread length published to fully threaded.
Passivated stainless steel screws provide added protection against oxidation and corrosion.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Passivated 18-8 Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
3-56 | |||||||||
| 1/8" | Fully Threaded | 0.193" | 0.071" | No. 1 | 70,000 | ASME B18.6.3 | 100 | 000000000 | 000000 |
| 3/16" | Fully Threaded | 0.193" | 0.071" | No. 1 | 70,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
| 1/4" | Fully Threaded | 0.193" | 0.071" | No. 1 | 70,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
| 5/16" | Fully Threaded | 0.193" | 0.071" | No. 1 | 70,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
| 3/8" | Fully Threaded | 0.193" | 0.071" | No. 1 | 70,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.193" | 0.071" | No. 1 | 70,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
Alloy Steel Hex Drive Flat Head Screws
Made from alloy steel, these screws are nearly twice as strong as stainless steel flat head screws. They're angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Black-oxide alloy steel screws have mild corrosion resistance in dry environments.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Flat Head Profile | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Alloy Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
3-56 | ||||||||||
| 1/4" | Fully Threaded | Standard | 0.226" | 0.073" | 1/16" | 120,000 | ASTM F835 | 10 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Standard | 0.226" | 0.073" | 1/16" | 120,000 | ASTM F835 | 10 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Standard | 0.226" | 0.073" | 1/16" | 120,000 | ASTM F835 | 10 | 000000000 | 00000 |
18-8 Stainless Steel Phillips Flat Head Screws
These screws have good chemical resistance and may be mildly magnetic. They’re angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Passivated stainless steel screws provide added protection against oxidation and corrosion.
For technical drawings and 3-D models, click on a part number.
| Lg. | Threading | Flat Head Profile | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Passivated 18-8 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
3-56 | ||||||||||
| 3/16" | Fully Threaded | Standard | 0.187" | 0.059" | No. 1 | 80,000 | ASME B18.6.3 | 100 | 000000000 | 00000 |
| 1/4" | Fully Threaded | Standard | 0.187" | 0.059" | No. 1 | 80,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
| 3/8" | Fully Threaded | Standard | 0.187" | 0.059" | No. 1 | 80,000 | ASME B18.6.3 | 100 | 000000000 | 0000 |
18-8 Stainless Steel Cup-Point Set Screws
Made from 18-8 stainless steel, these set screws are chemical resistant and may be mildly magnetic. They have a thin edge that digs into the contact surface for a secure hold. Length listed is the overall length.
For technical drawings and 3-D models, click on a part number.
| Lg. | Drive Size | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
3-56 | ||||||
| 1/16" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 00000 |
| 3/32" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 0000 |
| 1/8" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 0000 |
| 3/16" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 0000 |
| 1/4" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 0000 |
| 5/16" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 0000 |
| 3/8" | 0.050" | Rockwell B80 | ASME B18.3 | 10 | 000000000 | 0000 |
18-8 Stainless Steel Extended-Tip Set Screws
Made from 18-8 stainless steel, these set screws are chemical resistant and may be mildly magnetic. They have a protruding tip that locks within a mating hole or slot to keep parts aligned. They're also known as half dog-point set screws. Length listed is the overall length.
For technical drawings and 3-D models, click on a part number.
Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Lg. | Drive Size | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
3-56 | ||||||||
| 1/8" | 0.066" | 0.027" | 0.050" | Rockwell B80 | ASME B18.3 | 25 | 000000000 | 00000 |
Low-Strength Steel Hex Nuts
About half the strength of medium-strength steel nuts, these nuts are for light duty fastening applications, such as securing access panels.
Zinc-plated steel nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 3-56 | 3/16" | 1/16" | ASME B18.6.3 | 50 | 000000000 | 00000 |
18-8 Stainless Steel Hex Nuts
These nuts have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||
|---|---|---|---|---|---|
| 3-56 | 3/16" | 1/16" | 100 | 000000000 | 00000 |
Aluminum Hex Nuts
One-third the weight of steel, these aluminum nuts are corrosion resistant in wet environments and nonmagnetic. All meet ASME B18 dimensional standards.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
6061 Aluminum | ||||||
|---|---|---|---|---|---|---|
| 3-56 | 3/16" | 1/16" | ASME B18.6.3 | 5 | 000000000 | 00000 |
Brass Hex Nuts
These nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Brass | |||||
|---|---|---|---|---|---|
| 3-56 | 3/16" | 1/16" | 100 | 000000000 | 00000 |
18-8 Stainless Steel Cap Nuts
These cap nuts have good chemical resistance and may be mildly magnetic. Also known as acorn nuts, they have a smooth rounded head that covers and protects threads while providing a finished appearance.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Dp. | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||
| 3-56 | 5/64" | 1/4" | 1/4" | 1 | 000000000 | 00000 |
Super-Corrosion-Resistant 316 Stainless Steel Cap Nuts
These cap nuts have excellent resistance to chemicals and salt water. Also known as acorn nuts, they have a smooth rounded head that covers and protects threads while providing a finished appearance. They may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Dp. | Wd. | Ht. | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||
| 3-56 | 5/64" | 1/4" | 1/4" | 1 | 000000000 | 00000 |
Stainless Steel Helical Inserts
Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | Prong Break-Off Tools | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel—Right-Hand Threaded | |||||||||||||||
| 3-56 | 0.099" | No. 36 | 0.1065" | MS124-670 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 000000 |
| 3-56 | 0.148" | No. 36 | 0.1065" | MS124-710 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
Stainless Steel Screw-Locking Helical Inserts
A distorted thread grips the screw to resist loosening. Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | Prong Break-Off Tools | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | |||||||||||||||
| 3-56 | 0.099" | No. 36 | 0.1065" | MS21209-F0310 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 000000 |
| 3-56 | 0.148" | No. 36 | 0.1065" | MS21209-F0315, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |