About Flat Head Screws
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About Rounded Head Screws
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About Socket Head Screws
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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.
Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality. Screws that meet ASME B18.3, ASME B18.3.1M, ISO 21269, and ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.
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. | |
6-40 | |||||||||||
Black-Oxide Alloy Steel | |||||||||||
| 3/16" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 10 | 000000000 | 00000 |
| 1/4" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 100 | 000000000 | 00000 |
| 5/16" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 100 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 100 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 100 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 100 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASME B18.3, ASTM A574 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 10 | 000000000 | 0000 |
| 1 1/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 10 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 3/4" | Fine | 0.226" | 0.138" | 7/64" | 170,000 | ASTM A574 | 25 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 3/4" | Fine | 0.226" | 0.138" | 7/64" | 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.
Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.
Screws that meet ASME B1.1, ASME B18.3, ISO 21269, and ISO 4762 (formerly DIN 912) comply with standards for dimensions. Screws that meet ASTM B456 and ASTM F837 comply with standards for materials.
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. | |
6-40 | |||||||||||
18-8 Stainless Steel | |||||||||||
| 1/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 50 | 000000000 | 00000 |
| 3/16" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 100 | 000000000 | 0000 |
| 1/4" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 50 | 000000000 | 0000 |
| 5/16" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 50 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 50 | 000000000 | 00000 |
| 1/2" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3, ASTM F837 | 50 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 10 | 000000000 | 0000 |
| 7/8" | Partially Threaded | 3/4" | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 25 | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 10 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 3/4" | Fine | 0.226" | 0.138" | 7/64" | 70,000 | ASME B18.3 | 25 | 000000000 | 0000 |
Plastic Socket Head Screws
These screws are chemical and oil resistant, nonconductive, and lightweight. Length is measured from under the head.
Nylon screws may expand when exposed to moisture. 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 | Temp. Range, °F | Choose a Color | Pkg. Qty. | Pkg. | |
Nylon Plastic | ||||||||||
6-40 | ||||||||||
| 1/4" | Fully Threaded | Fine | 0.226" | 0.138" | 7/64" | -40° to 140° | 100 | 000000000 | 000000 | |
| 3/8" | Fully Threaded | Fine | 0.226" | 0.138" | 7/64" | -40° to 140° | 100 | 000000000 | 00000 | |
| 3/4" | Fully Threaded | Fine | 0.226" | 0.138" | 7/64" | -40° to 140° | 100 | 000000000 | 00000 | |
| 1" | Fully Threaded | Fine | 0.226" | 0.138" | 7/64" | -40° to 140° | 100 | 000000000 | 00000 | |
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.
Zinc-plated alloy steel screws resist corrosion in wet 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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
6-40 | ||||||||||
| 1/4" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 25 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASME B18.3;ASTM F835 | 25 | 000000000 | 00000 |
| 5/8" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASME B18.3;ASTM F835 | 50 | 000000000 | 00000 |
Zinc-Plated Alloy Steel | ||||||||||
6-40 | ||||||||||
| 1/4" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 50 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 50 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | 130,000 | ASTM F835 | 50 | 000000000 | 00000 |
18-8 Stainless Steel Hex Drive Flat Head Screws
These 18-8 stainless steel 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 have 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 | Finish | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel—82° Countersink Angle | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
6-40 | |||||||||||
| 1/4" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3 | 100 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3 | 100 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3 | 100 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3 | 100 | 000000000 | 0000 |
| 1" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3 | 100 | 000000000 | 0000 |
316 Stainless Steel Hex Drive Flat Head Screws
More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They 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 have 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 | Finish | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel—82° Countersink Angle | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
6-40 | |||||||||||
| 1/4" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3, ASTM F879 | 10 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3, ASTM F879 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Standard | 0.307" | 0.097" | 5/64" | Passivated | 70,000 | ASME B18.3, ASTM F879 | 10 | 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. | |
6-40 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3/16" | Fully Threaded | 0.262" | 0.073" | 5/64" | Passivated | 70,000 | ASME B18.3 | 10 | 000000000 | 00000 |
| 1/4" | Fully Threaded | 0.262" | 0.073" | 5/64" | Passivated | 70,000 | ASME B18.3 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | 0.262" | 0.073" | 5/64" | Passivated | 70,000 | ASME B18.3 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | 0.262" | 0.073" | 5/64" | __ | 70,000 | __ | 1 | 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
6-40 | |||||||||
| 1/4" | Fully Threaded | 0.262" | 0.073" | 5/64" | 120,000 | ASME B18.3;ASTM F835 | 25 | 000000000 | 000000 |
| 3/8" | Fully Threaded | 0.262" | 0.073" | 5/64" | 120,000 | ASME B18.3;ASTM F835 | 25 | 000000000 | 00000 |
| 1/2" | Fully Threaded | 0.262" | 0.073" | 5/64" | 120,000 | ASME B18.3;ASTM F835 | 25 | 000000000 | 00000 |
Brass Button Head Hex Drive Screws
Brass button head screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.