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About Tapping Screws
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Compare drilling, pointed, thread-forming, and thread-cutting tips to find the best choice for your material.
Stainless Steel Flanged Hex Head Drilling Screws
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These corrosion-resistant screws save time and effort by drilling and fastening in one step. The hex head gives you a firm, high-torque grip with a nutdriver or socket. Screws have a flange under the head that spreads the load to prevent crushing thin metal.
Length is measured from under the flange. Head height includes the flange.
Galvanic-Barrier-Coated 18-8 Stainless Steel with Hardened Steel Tip—Penetrate metal and resist corrosion from contact between dissimilar metals. The coating has been tested to extreme standards, including at least 500 hours of salt spray resistance, to hold up in wet and outdoor environments. The hardened tip pierces metal for secure fastening.
Drill Tip | Head | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Point Size | Lg. | Wd. | Ht. | Flange Dia. | Max. Drilling Thk. | Tapping Screw Type Designation | Approx. Threads per In. | Pkg. Qty. | Pkg. | |||
Galvanic-Barrier-Coated 18-8 Stainless Steel with Hardened Steel Tip | |||||||||||||
No. 10 Screw Size | |||||||||||||
| 3/4" | No. 2 | 13/64" | 0.313" | 0.16" | 0.4" | 0.106" | BSD | 16 | 10 | 90420A401 | 00000 | ||
| 1" | No. 2 | 7/32" | 0.313" | 0.157" | 0.4" | 0.11" | BSD | 16 | 10 | 97246A116 | 0000 | ||
| 1 1/2" | No. 2 | 13/64" | 0.313" | 0.16" | 0.414" | 0.106" | BSD | 16 | 10 | 90420A405 | 0000 | ||
| 2" | No. 2 | 7/32" | 0.313" | 0.163" | 0.432" | 0.177" | BSD | 16 | 10 | 97246A117 | 00000 | ||
No. 12 Screw Size | |||||||||||||
| 1" | No. 2 | 1/4" | 0.313" | 0.2" | 0.415" | 0.14" | BSD | 14 | 10 | 90420A511 | 0000 | ||
| 1 1/2" | No. 2 | 1/4" | 0.313" | 0.2" | 0.415" | 0.14" | BSD | 14 | 10 | 90420A520 | 0000 | ||
| 2" | No. 2 | 1/4" | 0.313" | 0.2" | 0.415" | 0.14" | BSD | 14 | 10 | 90420A525 | 00000 | ||
| 2 1/2" | No. 3 | 9/32" | 0.313" | 0.2" | 0.415" | 0.187" | BSD | 14 | 10 | 90420A590 | 00000 | ||
1/4" Screw Size | |||||||||||||
| 1" | No. 2 | 5/16" | 0.375" | 1/4" | 1/2" | 0.155" | BSD | 14 | 10 | 90420A614 | 00000 | ||
| 1" | No. 3 | 5/16" | 0.375" | 1/4" | 1/2" | 0.21" | CSD | 20 | 10 | 90420A650 | 00000 | ||
| 1 1/2" | No. 2 | 5/16" | 0.375" | 1/4" | 1/2" | 0.155" | BSD | 14 | 10 | 90420A516 | 00000 | ||
| 1 1/2" | No. 3 | 5/16" | 0.375" | 1/4" | 1/2" | 0.21" | CSD | 20 | 10 | 90420A655 | 00000 | ||
| 1 1/2" | No. 5 | 19/32" | 0.375" | 0.247" | 1/2" | 1/2" | CSD | 20 | 5 | 97246A111 | 0000 | ||
| 2" | No. 2 | 5/16" | 0.375" | 1/4" | 1/2" | 0.155" | BSD | 14 | 10 | 90420A518 | 00000 | ||
| 2" | No. 3 | 5/16" | 0.375" | 0.237" | 0.52" | 0.21" | CSD | 20 | 10 | 90420A659 | 00000 | ||
| 2" | No. 5 | 45/64" | 0.375" | 0.237" | 0.52" | 1/2" | CSD | 20 | 10 | 90420A681 | 00000 | ||
| 2 1/2" | No. 3 | 5/16" | 0.375" | 1/4" | 1/2" | 0.21" | CSD | 20 | 5 | 90420A662 | 00000 | ||
| 3" | No. 3 | 5/16" | 0.375" | 0.237" | 0.52" | 0.21" | CSD | 20 | 5 | 90420A665 | 00000 | ||
| 3" | No. 5 | 19/32" | 0.375" | 0.247" | 1/2" | 1/2" | CSD | 20 | 5 | 97246A112 | 00000 | ||
| 4" | No. 3 | 5/16" | 0.375" | 0.237" | 0.52" | 0.21" | CSD | 20 | 5 | 90420A667 | 00000 | ||
| 4" | No. 5 | 19/32" | 0.375" | 0.247" | 1/2" | 1/2" | CSD | 20 | 5 | 97246A113 | 00000 | ||
| 5" | No. 5 | 19/32" | 0.375" | 0.247" | 1/2" | 1/2" | CSD | 20 | 1 | 97246A114 | 0000 | ||
| 6" | No. 5 | 19/32" | 0.375" | 0.247" | 1/2" | 1/2" | CSD | 20 | 1 | 97246A115 | 0000 | ||
Stainless Steel Flanged Hex Head Drilling Screws for Aluminum
 |  |
In a single step, these corrosion-resistant screws drill and fasten aluminum to aluminum framing. The hex head gives you a firm, high-torque grip with a nutdriver or socket. These screws have a flange under the head that spreads the load to prevent crushing thin metal.
Length is measured from the flange. Head height includes the flange.
Galvanic-Barrier-Coated 18-8 Stainless Steel—A protective layer prevents corrosion from contact between dissimilar metals. These screws also won’t rust in wet and outdoor environments.
Drill Tip | Head | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Point Size | Lg. | Wd. | Ht. | Flange Dia. | Max. Drilling Thk. | Tapping Screw Type Designation | Approx. Threads per In. | Pkg. Qty. | Pkg. | |||
Galvanic-Barrier-Coated 18-8 Stainless Steel | |||||||||||||
No. 8 Screw Size | |||||||||||||
| 1/2" | No. 2 | 3/16" | 0.25" | 0.141" | 0.348" | 0.098" | BSD | 18 | 25 | 90821A330 | 000000 | ||
| 3/4" | No. 2 | 3/16" | 0.25" | 0.141" | 0.348" | 0.098" | BSD | 18 | 25 | 90821A350 | 00000 | ||
No. 10 Screw Size | |||||||||||||
| 3/4" | No. 3 | 1/4" | 0.313" | 0.151" | 0.414" | 0.15" | BSD | 16 | 25 | 90821A357 | 00000 | ||
| 1" | No. 3 | 1/4" | 0.313" | 0.151" | 0.414" | 0.15" | BSD | 16 | 25 | 90821A359 | 00000 | ||
No. 12 Screw Size | |||||||||||||
| 3/4" | No. 3 | 9/32" | 0.313" | 0.194" | 0.432" | 0.187" | BSD | 14 | 25 | 90821A374 | 00000 | ||
| 1" | No. 3 | 9/32" | 0.313" | 0.194" | 0.432" | 0.187" | BSD | 14 | 25 | 90821A377 | 00000 | ||
| 1 1/4" | No. 3 | 9/32" | 0.313" | 0.194" | 0.432" | 0.187" | BSD | 14 | 10 | 90821A380 | 00000 | ||
| 1 1/2" | No. 3 | 9/32" | 0.313" | 0.194" | 0.432" | 0.187" | BSD | 14 | 25 | 90821A390 | 00000 | ||
| 2" | No. 3 | 9/32" | 0.313" | 0.194" | 0.432" | 0.187" | BSD | 14 | 5 | 90821A420 | 0000 | ||
| 3" | No. 3 | 9/32" | 0.313" | 0.194" | 0.432" | 0.187" | BSD | 14 | 5 | 90821A510 | 00000 | ||
1/4" Screw Size | |||||||||||||
| 3/4" | No. 3 | 5/16" | 0.375" | 0.24" | 0.52" | 0.21" | BSD | 14 | 25 | 90821A550 | 00000 | ||
| 1" | No. 3 | 5/16" | 0.375" | 0.24" | 0.52" | 0.21" | BSD | 14 | 25 | 90821A553 | 00000 | ||
| 1" | No. 4 | 5/16" | 0.375" | 0.24" | 0.52" | 0.236" | CSD | 20 | 10 | 90821A610 | 00000 | ||
| 1 1/2" | No. 3 | 5/16" | 0.375" | 0.24" | 0.52" | 0.21" | BSD | 14 | 10 | 90821A559 | 00000 | ||
| 1 1/2" | No. 4 | 5/16" | 0.375" | 0.24" | 0.52" | 0.236" | CSD | 20 | 10 | 90821A613 | 00000 | ||
Aluminum Phillips Rounded Head Screws for Sheet Metal
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Our lightest sheet metal screws reduce weight in aluminum assemblies. They have a pointed tip to start a hole in sheets up to 0.025" thick, but for thicker material you’ll need to drill first. The Phillips drive handles enough torque to keep drivers from slipping and the rounded head creates a finished look.
Length is measured from under the head.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Tapping Screw Type Designation | Drive Size | Approx. Threads per In. | Drill Bit Size | Pkg. Qty. | Pkg. | |||
Lightweight 2024 Aluminum | |||||||||||
No. 6 Screw Size | |||||||||||
| 3/8" | 0.27" | 0.097" | AB | No. 2 | 18 | 32 Ga. | 50 | 93080A310 | 000000 | ||
| 1/2" | 0.27" | 0.097" | AB | No. 2 | 18 | 32 Ga. | 25 | 93080A330 | 00000 | ||
| 1" | 0.27" | 0.097" | AB | No. 2 | 18 | 32 Ga. | 25 | 93080A390 | 00000 | ||
No. 8 Screw Size | |||||||||||
| 3/8" | 0.322" | 0.115" | AB | No. 2 | 15 | 29 Ga. | 10 | 93080A420 | 0000 | ||
| 1" | 0.322" | 0.115" | AB | No. 2 | 15 | 29 Ga. | 25 | 93080A480 | 00000 | ||
| 1 1/2" | 0.322" | 0.115" | AB | No. 2 | 15 | 29 Ga. | 25 | 93080A520 | 00000 | ||
Aluminum Serrated-Flange Hex Head Drilling Screws for Aluminum
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Fasten lightweight aluminum components without worrying about galvanic corrosion. They’re also corrosion resistant and nonmagnetic. A serrated flange spreads the load to prevent crushing material and grips surfaces to resist mild vibration. The hex head gives you a firm, high-torque grip with a nutdriver or socket.
Length is measured from the flange. Head height includes the flange.
Drill Tip | Head | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Point Size | Lg. | Wd. | Ht. | Flange Dia. | Max. Drilling Thk. | Tapping Screw Type Designation | Approx. Threads per In. | Pkg. Qty. | Pkg. | |||
Lightweight 7075 Aluminum | |||||||||||||
No. 8 Screw Size | |||||||||||||
| 1/2" | No. 2 | 3/16" | 0.25" | 0.141" | 0.348" | 0.098" | BSD | 18 | 10 | 98248A220 | 000000 | ||
| 3/4" | No. 2 | 3/16" | 0.25" | 0.141" | 0.348" | 0.098" | BSD | 18 | 10 | 98248A250 | 00000 | ||
| 1" | No. 2 | 3/16" | 0.25" | 0.141" | 0.348" | 0.098" | BSD | 18 | 10 | 98248A270 | 00000 | ||
No. 10 Screw Size | |||||||||||||
| 1/2" | No. 2 | 13/64" | 0.313" | 0.151" | 0.414" | 0.106" | BSD | 16 | 10 | 98248A430 | 00000 | ||
| 3/4" | No. 2 | 13/64" | 0.313" | 0.151" | 0.414" | 0.106" | BSD | 16 | 10 | 98248A470 | 00000 | ||
| 1" | No. 2 | 13/64" | 0.313" | 0.151" | 0.414" | 0.106" | BSD | 16 | 10 | 98248A490 | 00000 | ||
