About Flat Head Screws
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316 Stainless Steel Hex Drive Flat Head Screws
Undercut Profile
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.
Screws with an undercut profile have a shallow head for use in thin materials. Screws with a 100° countersink angle distribute pressure over a wide area to prevent crushing soft materials.
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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
10-24 | |||||||||||
| 1/4" | Fully Threaded | Undercut | 0.411" | 0.081" | 1/8" | Passivated | 70,000 | ASME B18.3 | 10 | 000000000 | 00000 |
10-32 | |||||||||||
| 1/4" | Fully Threaded | Undercut | 0.411" | 0.089" | 1/8" | Passivated | 70,000 | ASME B18.3, ASTM F879 | 25 | 000000000 | 0000 |
1/4"-20 | |||||||||||
| 1/4" | Fully Threaded | Undercut | 0.531" | 0.107" | 5/32" | Passivated | 70,000 | __ | 10 | 000000000 | 0000 |
1/4"-28 | |||||||||||
| 1/4" | Fully Threaded | Undercut | 0.531" | 0.107" | 5/32" | Passivated | 70,000 | ASME B18.3 | 10 | 000000000 | 00000 |
3/8"-16 | |||||||||||
| 1/2" | Fully Threaded | Standard | 0.781" | 0.234" | 7/32" | Passivated | 70,000 | ASME B18.3 | 5 | 000000000 | 0000 |
316 Stainless Steel—100° Countersink Angle | |||||||||||
4-40 | |||||||||||
| 3/16" | Fully Threaded | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
| 1/4" | Fully Threaded | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
| 5/16" | Fully Threaded | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
| 1/2" | Fully Threaded | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
6-32 | |||||||||||
| 1/4" | Fully Threaded | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
| 5/16" | Fully Threaded | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 5 | 000000000 | 00000 |
| 3/8" | Fully Threaded | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
8-32 | |||||||||||
| 3/8" | Fully Threaded | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
10-32 | |||||||||||
| 3/8" | Fully Threaded | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
1/4"-20 | |||||||||||
| 1/2" | Fully Threaded | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
5/16"-18 | |||||||||||
| 3/4" | Fully Threaded | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
Metric 316 Stainless Steel Hex Drive Flat Head Screws
Undercut Profile
Steel with 100° Countersink
More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic. Screws are angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Passivated screws have added protection against oxidation and corrosion.
Screws with an undercut profile have a shallow head for use in thin materials. They have a 100° countersink angle that distributes pressure over a wide area to prevent crushing soft materials.
For technical drawings and 3-D models, click on a part number.
| Lg., mm | Threading | Flat Head Profile | Head Dia., mm | Head Ht., mm | Drive Size, mm | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Passivated 316 Stainless Steel—100° Countersink Angle | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
M3 × 0.5 mm | ||||||||||
| 5 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | __ | 5 | 000000000 | 000000 |
| 6 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | __ | 5 | 000000000 | 00000 |
| 8 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | __ | 5 | 000000000 | 00000 |
| 10 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | __ | 5 | 000000000 | 00000 |
| 12 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | __ | 5 | 000000000 | 00000 |
M4 × 0.7 mm | ||||||||||
| 6 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 8 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 10 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 12 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 16 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | __ | 1 | 000000000 | 0000 |
M5 × 0.8 mm | ||||||||||
| 8 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | __ | 1 | 000000000 | 0000 |
| 10 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | __ | 1 | 000000000 | 0000 |
| 12 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | __ | 1 | 000000000 | 0000 |
| 16 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | __ | 1 | 000000000 | 0000 |
| 20 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | __ | 1 | 000000000 | 0000 |
M6 × 1 mm | ||||||||||
| 12 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | __ | 1 | 000000000 | 0000 |
| 16 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | __ | 1 | 000000000 | 0000 |
| 20 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | __ | 1 | 000000000 | 0000 |
| 25 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | __ | 1 | 000000000 | 0000 |
| 30 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | __ | 1 | 000000000 | 0000 |
M8 × 1.25 mm | ||||||||||
| 16 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 20 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 25 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | __ | 1 | 000000000 | 0000 |
| 30 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | __ | 1 | 000000000 | 0000 |
M10 × 1.5 mm | ||||||||||
| 16 | Fully Threaded | Undercut | 20 | 3.5 | 6 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
| 25 | Fully Threaded | Undercut | 20 | 3.5 | 6 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
| 30 | Fully Threaded | Undercut | 20 | 3.5 | 6 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
| 35 | Fully Threaded | Undercut | 20 | 3.5 | 6 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
| 50 | Fully Threaded | Undercut | 20 | 3.5 | 6 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
M12 × 1.75 mm | ||||||||||
| 25 | Fully Threaded | Undercut | 24 | 4.2 | 8 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
| 30 | Fully Threaded | Undercut | 24 | 4.2 | 8 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
| 35 | Fully Threaded | Undercut | 24 | 4.2 | 8 | 70,000 | ASTM A276 | 1 | 000000000 | 00000 |
Black-Oxide 316 Stainless Steel—100° Countersink Angle | ||||||||||
M3 × 0.5 mm | ||||||||||
| 5 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 6 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 8 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 10 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 12 | Fully Threaded | Undercut | 6 | 1.3 | 2 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
M4 × 0.7 mm | ||||||||||
| 6 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 8 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 10 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 12 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 16 | Fully Threaded | Undercut | 8 | 1.6 | 2.5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
M5 × 0.8 mm | ||||||||||
| 8 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 10 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 12 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 16 | Fully Threaded | Undercut | 10 | 1.9 | 3 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
M6 × 1 mm | ||||||||||
| 12 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 16 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 20 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 30 | Fully Threaded | Undercut | 12 | 2.2 | 4 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
M8 × 1.25 mm | ||||||||||
| 16 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 20 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
| 25 | Fully Threaded | Undercut | 16 | 2.8 | 5 | 70,000 | ASTM A276 | 1 | 000000000 | 0000 |
18-8 Stainless Steel Hex Drive Flat Head Screws
Fully Threaded
Partially Threaded
Stainless Steel with 82 Degree Countersink Angle
Undercut Profile
Stainless Steel with 100 Degree Countersink Angle
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.
Screws with an undercut profile have a shallow head for use in thin materials.
Screws with a 100° countersink angle distribute pressure over a wide area to prevent crushing soft materials.
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 | Min. Thread Lg. | 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
4-40 | ||||||||||||
| 1/8" | Fully Threaded | __ | Undercut | 0.212" | 0.047" | 1/16" | __ | 70,000 | ASME B18.3, ASTM F879 | 10 | 000000000 | 000000 |
| 3/16" | Fully Threaded | __ | Undercut | 0.255" | 0.047" | 1/16" | Passivated | 70,000 | ASME B18.3, ASTM F879 | 100 | 000000000 | 0000 |
6-32 | ||||||||||||
| 3/16" | Fully Threaded | __ | Undercut | 0.307" | 0.059" | 5/64" | Passivated | 70,000 | ASME B18.3 | 25 | 000000000 | 0000 |
10-24 | ||||||||||||
| 1/4" | Fully Threaded | __ | Undercut | 0.411" | 0.081" | 1/8" | Passivated | 70,000 | ASME B18.3 | 25 | 000000000 | 0000 |
10-32 | ||||||||||||
| 1/4" | Fully Threaded | __ | Undercut | 0.411" | 0.081" | 1/8" | Passivated | 70,000 | ASME B18.3 | 50 | 000000000 | 0000 |
1/4"-20 | ||||||||||||
| 1/4" | Partially Threaded | 0.11" | Undercut | 0.531" | 0.161" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
18-8 Stainless Steel—100° Countersink Angle | ||||||||||||
4-40 | ||||||||||||
| 3/16" | Partially Threaded | 0.12" | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/4" | Partially Threaded | 0.18" | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/16" | Partially Threaded | 0.24" | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/8" | Partially Threaded | 0.31" | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Partially Threaded | 0.43" | Undercut | 0.255" | 0.059" | 1/16" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
6-32 | ||||||||||||
| 1/4" | Partially Threaded | 0.17" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/16" | Partially Threaded | 0.23" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/8" | Partially Threaded | 0.29" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Partially Threaded | 0.42" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Partially Threaded | 0.54" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Partially Threaded | 0.67" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.54" | Undercut | 0.307" | 0.066" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
8-32 | ||||||||||||
| 1/4" | Partially Threaded | 0.16" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/16" | Partially Threaded | 0.22" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/8" | Partially Threaded | 0.28" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Partially Threaded | 0.41" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Partially Threaded | 0.53" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Partially Threaded | 0.66" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.91" | Undercut | 0.359" | 0.076" | 5/64" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
10-24 | ||||||||||||
| 3/8" | Partially Threaded | 0.26" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Partially Threaded | 0.38" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Partially Threaded | 0.51" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Partially Threaded | 0.63" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.88" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
10-32 | ||||||||||||
| 3/8" | Partially Threaded | 0.26" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Partially Threaded | 0.38" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Partially Threaded | 0.31" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Partially Threaded | 0.63" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.88" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1.38" | Undercut | 0.411" | 0.084" | 3/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
1/4"-20 | ||||||||||||
| 3/8" | Partially Threaded | 0.24" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1/2" | Partially Threaded | 0.36" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 5/8" | Partially Threaded | 0.49" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Partially Threaded | 0.61" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 7/8" | Partially Threaded | 0.74" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.86" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 1.11" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1.36" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1.61" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1.86" | Undercut | 0.531" | 0.105" | 1/8" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
5/16"-18 | ||||||||||||
| 5/8" | Partially Threaded | 0.44" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 3/4" | Partially Threaded | 0.57" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.82" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 1.07" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1.32" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1.6" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1.82" | Undercut | 0.656" | 0.127" | 5/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
3/8"-16 | ||||||||||||
| 3/4" | Partially Threaded | 0.55" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1" | Partially Threaded | 0.8" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 0.8" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1.3" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 1.55" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1.8" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 2.3" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 2.8" | Undercut | 0.781" | 0.157" | 7/32" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
1/2"-13 | ||||||||||||
| 1" | Partially Threaded | 0.74" | Undercut | 0.937" | 0.181" | 5/16" | Passivated | 70,000 | __ | 1 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 0.99" | Undercut | 0.937" | 0.181" | 5/16" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 1.24" | Undercut | 0.937" | 0.181" | 5/16" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1.74" | Undercut | 0.937" | 0.181" | 5/16" | Passivated | 70,000 | __ | 1 | 000000000 | 00000 |
Alloy Steel Hex Drive Flat Head Screws
Black Oxide
Undercut Profile
Zinc Plated
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.
Screws with an undercut profile have a shallow head for use in thin materials.
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
1-64 | ||||||||||
| 1/8" | Fully Threaded | Undercut | 0.168" | 0.031" | 0.050" | 130,000 | ASME B18.3;ASTM F835 | 10 | 000000000 | 000000 |
3-48 | ||||||||||
| 3/16" | Fully Threaded | Undercut | 0.187" | 0.042" | 1/16" | 130,000 | ASTM F835 | 25 | 000000000 | 0000 |
4-40 | ||||||||||
| 1/8" | Fully Threaded | Undercut | 0.255" | 0.047" | 1/16" | 130,000 | ASTM F835 | 25 | 000000000 | 00000 |
5-40 | ||||||||||
| 1/8" | Fully Threaded | Undercut | 0.281" | 0.053" | 5/64" | 130,000 | ASTM F835 | 10 | 000000000 | 00000 |
6-32 | ||||||||||
| 1/8" | Fully Threaded | Undercut | 0.262" | 0.059" | 5/64" | 130,000 | ASTM F835 | 10 | 000000000 | 00000 |
| 5/32" | Fully Threaded | Undercut | 0.262" | 0.059" | 5/64" | 130,000 | ASTM F835 | 5 | 000000000 | 0000 |
| 3/16" | Fully Threaded | Undercut | 0.262" | 0.059" | 5/64" | 130,000 | ASTM F835 | 25 | 000000000 | 00000 |
8-32 | ||||||||||
| 5/32" | Fully Threaded | Undercut | 0.312" | 0.07" | 3/32" | 130,000 | ASTM F835 | 10 | 000000000 | 00000 |
| 3/16" | Fully Threaded | Undercut | 0.359" | 0.07" | 3/32" | 130,000 | ASTM F835 | 25 | 000000000 | 00000 |
10-32 | ||||||||||
| 3/16" | Fully Threaded | Undercut | 0.362" | 0.081" | 1/8" | 130,000 | ASTM F835 | 5 | 000000000 | 00000 |
1/4"-20 | ||||||||||
| 1/4" | Fully Threaded | Undercut | 0.531" | 0.107" | 5/32" | 130,000 | ASTM F835 | 10 | 000000000 | 00000 |
1/4"-28 | ||||||||||
| 1/4" | Fully Threaded | Undercut | 0.477" | 0.107" | 5/32" | 130,000 | ASTM F835 | 5 | 000000000 | 00000 |
3/8"-16 | ||||||||||
| 3/8" | Fully Threaded | Undercut | 0.717" | 0.161" | 7/32" | 130,000 | ASTM F835 | 5 | 000000000 | 00000 |
Zinc-Plated Alloy Steel | ||||||||||
6-32 | ||||||||||
| 3/16" | Fully Threaded | Undercut | 0.307" | 0.078" | 5/64" | 130,000 | ASTM F835 | 25 | 000000000 | 00000 |
8-32 | ||||||||||
| 1/4" | Fully Threaded | Undercut | 0.359" | 0.099" | 3/32" | 130,000 | ASTM F835 | 100 | 000000000 | 00000 |
Tamper-Resistant Hex Drive Flat Head Screws
Undercut Profile
A tamper-resistant hex drive (also known as a pin-in hex drive) makes these screws difficult to remove without special tools. For installation tools, see tamper-resistant hex drivers and bits. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. All are passivated for added protection against oxidation and corrosion. They’re angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Screws with an undercut profile have a shallow head for use in thin materials.
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. | |
18-8 Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
6-32 | ||||||||||
| 1/4" | Fully Threaded | Undercut | 0.307" | 0.059" | 1/8" | 70,000 | ASME B18.3 | 25 | 000000000 | 00000 |