Material Material |
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Screw Features Screw Features |
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| With Washer | Flanged |
Threading Threading |
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 | Fully Threaded |
 | Partially Threaded |
Washer Type Washer Type |
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| Flat | External-Tooth Lock |
Washer Material Washer Material |
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Hardness Hardness |
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Tensile Strength Tensile Strength |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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About Tapping Screws
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About Hex Head Screws and Bolts
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Hex Head Screws with Flat Washer
A freely rotating but permanently attached washer distributes pressure over a wider area than a flange, preventing damage to your material's surface. Also known as Sems 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.
For technical drawings and 3-D models, click on a part number.
Head | Washer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Wd. | Ht. | OD | Thick. | Material | Tensile Strength, psi | Each | |
18-8 Stainless Steel | ||||||||||
1/4"-20 | ||||||||||
| 1/2" | Fully Threaded | Coarse | 7/16" | 5/32" | 0.749" | 0.064" | Stainless Steel | 100,000 | 000000000 | 00000 |
| 3/4" | Fully Threaded | Coarse | 7/16" | 5/32" | 0.749" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 7/16" | 5/32" | 0.749" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
5/16"-18 | ||||||||||
| 1/2" | Fully Threaded | Coarse | 1/2" | 13/64" | 0.89" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 1/2" | 13/64" | 0.89" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 1/2" | 13/64" | 0.89" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
3/8"-16 | ||||||||||
| 3/4" | Fully Threaded | Coarse | 9/16" | 15/64" | 1.015" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 9/16" | 15/64" | 1.015" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | 9/16" | 15/64" | 1.015" | 0.064" | Stainless Steel | 100,000 | 000000000 | 0000 |
1/2"-13 | ||||||||||
| 1" | Fully Threaded | Coarse | 3/4" | 5/16" | 1.243" | 0.101" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | 3/4" | 5/16" | 1.243" | 0.101" | Stainless Steel | 100,000 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | 3/4" | 5/16" | 1.243" | 0.101" | Stainless Steel | 100,000 | 000000000 | 0000 |
Hex Head Screws with Lock Washer
Also known as Sems screws, these screws have a permanently attached but freely rotating tooth lock washer that bites into the mating surface for vibration resistance. The zinc plating provides corrosion resistance in wet environments. Length is measured from under the head.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Fine threads are closely spaced to prevent loosening from vibration.
For technical drawings and 3-D models, click on a part number.
Head | Washer | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Wd. | Ht. | OD | Thick. | Material | Tensile Strength, psi | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||||
6-32 | |||||||||||
| 1/4" | Fully Threaded | Coarse | 1/4" | 3/32" | 0.285" | 0.022" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 000000 |
| 3/8" | Fully Threaded | Coarse | 1/4" | 3/32" | 0.285" | 0.022" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Coarse | 1/4" | 3/32" | 0.285" | 0.022" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
8-32 | |||||||||||
| 1/4" | Fully Threaded | Coarse | 5/16" | 7/64" | 0.317" | 0.023" | Zinc-Plated Steel | 60,000 | 50 | 000000000 | 0000 |
| 3/8" | Fully Threaded | Coarse | 5/16" | 7/64" | 0.317" | 0.023" | Zinc-Plated Steel | 60,000 | 50 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 5/16" | 7/64" | 0.317" | 0.023" | Zinc-Plated Steel | 60,000 | 50 | 000000000 | 0000 |
10-24 | |||||||||||
| 3/8" | Fully Threaded | Coarse | 5/16" | 1/8" | 0.381" | 0.024" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Coarse | 5/16" | 1/8" | 0.381" | 0.024" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
10-32 | |||||||||||
| 3/8" | Fully Threaded | Fine | 5/16" | 1/8" | 0.381" | 0.024" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Fine | 5/16" | 1/8" | 0.381" | 0.024" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
1/4"-20 | |||||||||||
| 3/8" | Fully Threaded | Coarse | 7/16" | 3/16" | 0.475" | 0.028" | Zinc-Plated Steel | 60,000 | 100 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Coarse | 7/16" | 3/16" | 0.475" | 0.028" | Zinc-Plated Steel | 60,000 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | Coarse | 7/16" | 3/16" | 0.475" | 0.028" | Zinc-Plated Steel | 60,000 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 7/16" | 3/16" | 0.475" | 0.028" | Zinc-Plated Steel | 60,000 | 25 | 000000000 | 0000 |
Steel Vibration-Damping Hex Head Screws for Sheet Metal
These steel screws are zinc plated to resist corrosion in wet environments. A rubber washer cushions the screw to resist loosening from vibration. They have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. Screws penetrate 0.025" and thinner sheet metal. Length is measured from under the washer.
For technical drawings and 3-D models, click on a part number.
Head | Washer | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | OD | Thick. | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||
No. 14 | |||||||||
| 5/8" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 25 | 000000000 | 00000 |
| 3/4" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 50 | 000000000 | 00000 |
| 1" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 50 | 000000000 | 00000 |
| 1 1/4" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 50 | 000000000 | 00000 |
| 1 1/2" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 50 | 000000000 | 00000 |
| 2" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 25 | 000000000 | 00000 |
| 2 1/2" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 25 | 000000000 | 00000 |
| 3" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 25 | 000000000 | 00000 |
| 4" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 10 | 000000000 | 00000 |
| 5" | 0.375" | 0.181" | 5/8" | 0.101" | 5.5 mm | 10 | 5 | 000000000 | 00000 |
No. 17 | |||||||||
| 3/4" | 0.375" | 0.181" | 5/8" | 0.101" | 1/4" | 10 | 25 | 000000000 | 00000 |
| 1" | 0.375" | 0.181" | 5/8" | 0.101" | 1/4" | 10 | 25 | 000000000 | 00000 |
Stainless Steel Vibration-Damping Hex Head Screws for Sheet Metal
Made from 18-8 stainless steel, these screws are chemical resistant and may be mildly magnetic. A rubber washer cushions the screw to resist loosening from vibration. They have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. Screws penetrate 0.025" and thinner sheet metal. Length is measured from under the washer.
For technical drawings and 3-D models, click on a part number.
Head | Washer | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | OD | Thick. | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
No. 14 | |||||||||
| 3/4" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 10 | 000000000 | 000000 |
| 1" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 10 | 000000000 | 00000 |
| 1 1/2" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 10 | 000000000 | 00000 |
| 2" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 10 | 000000000 | 00000 |
| 2 1/2" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 5 | 000000000 | 00000 |
| 3" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 5 | 000000000 | 00000 |
| 4" | 0.375" | 0.181" | 0.625" | 0.101" | 5.5 mm | 10 | 1 | 000000000 | 0000 |
No. 17 | |||||||||
| 3/4" | 0.375" | 0.181" | 0.625" | 0.101" | 1/4" | 10 | 10 | 000000000 | 00000 |
| 1" | 0.375" | 0.181" | 0.625" | 0.101" | 1/4" | 10 | 10 | 000000000 | 00000 |
High-Strength 410 Stainless Steel Flanged Hex Head Screws for Sheet Metal
Stronger and more wear resistant than 18-8 and 316 stainless steel, these screws are magnetic and mildly chemical resistant. They're not for use with aluminum sheet metal. All have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. Screws penetrate 0.025" and thinner sheet metal. Length is measured from under the flange. Head height includes the flange.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
410 Stainless Steel | ||||||||
No. 6 | ||||||||
| 3/8" | 0.25" | 0.118" | 0.328" | No. 32 | 18 | 100 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.118" | 0.328" | No. 32 | 18 | 100 | 000000000 | 0000 |
| 5/8" | 0.25" | 0.118" | 0.328" | No. 32 | 18 | 100 | 000000000 | 0000 |
| 3/4" | 0.25" | 0.118" | 0.328" | No. 32 | 18 | 100 | 000000000 | 0000 |
No. 8 | ||||||||
| 3/8" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 100 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 100 | 000000000 | 00000 |
| 5/8" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 100 | 000000000 | 00000 |
| 3/4" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 100 | 000000000 | 00000 |
| 1" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 100 | 000000000 | 00000 |
| 1 1/4" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 50 | 000000000 | 0000 |
| 1 1/2" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 50 | 000000000 | 0000 |
No. 10 | ||||||||
| 3/8" | 0.313" | 0.151" | 0.414" | No. 21 | 12 | 100 | 000000000 | 00000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 21 | 12 | 100 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.151" | 0.414" | No. 21 | 12 | 100 | 000000000 | 00000 |
| 1" | 0.313" | 0.151" | 0.414" | No. 21 | 12 | 50 | 000000000 | 0000 |
| 1 1/2" | 0.313" | 0.151" | 0.414" | No. 21 | 12 | 25 | 000000000 | 0000 |
Stainless Steel Flanged Piercing Screws for Sheet Metal
Made from 410 stainless steel, these screws are strong, wear resistant, mildly chemical resistant, and magnetic. They're not for use with aluminum sheet metal. Also known as needle point screws, they're designed with a pointed tip to pierce a starter hole in sheets up to 0.050" thick. All have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. Length is measured from under the flange. Head height includes the flange.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
410 Stainless Steel | ||||||||
No. 6 | ||||||||
| 3/8" | 0.25" | 0.118" | 0.328" | No. 32 | 18 | 50 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.118" | 0.328" | No. 32 | 18 | 50 | 000000000 | 0000 |
No. 8 | ||||||||
| 1/2" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 50 | 000000000 | 00000 |
| 3/4" | 0.25" | 0.141" | 0.348" | No. 29 | 15 | 50 | 000000000 | 00000 |
No. 10 | ||||||||
| 1" | 0.25" | 0.142" | 0.343" | No. 21 | 12 | 25 | 000000000 | 00000 |
| 1 1/2" | 0.25" | 0.142" | 0.343" | No. 21 | 12 | 25 | 000000000 | 00000 |
| 2" | 0.25" | 0.142" | 0.343" | No. 21 | 12 | 25 | 000000000 | 00000 |