Tri-Lobular Screws | McMaster-Carr

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Shank Cross Section

Tri-Lobe

System of Measurement

Screw Size

Length

For Use In

Drive Style

Fastener Head Type

Material

Tip Type

Thread Size

Rounded Head Style

Finish

Corrosion-Resistant Coated

Tapping Method

Drive Size

Threading

Tapping Screw Type

Drill Bit Decimal Size Equivalent

Head Height

Drill Bit Size

Thread Pitch

Flat Head Profile

RoHS

REACH

DFARS Specialty Metals

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Exempt

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Export Control Classification Number (ECCN)

EAR99

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About Tapping Screws

Strip-Resistant Screws for Sheet Metal

Also known as Fastite screws, these offer more thread engagement in 0.028" to 0.063" thick sheets to prevent overtightening and damaging threads.

Metric Thread-Forming Screws for Soft Metal

These metric screws have a triangular shank that presses tightly as it forms threads, so screws resist loosening in soft metals such as brass, aluminum, and copper.

Thread-Forming Screws for Soft Metal

The triangular shank presses tightly as it forms threads, so screws resist loosening in soft metals such as brass, aluminum, and copper.

18-8 Stainless Steel Phillips Rounded
Head Thread-Forming Screws for Plastic

These 18-8 stainless steel screws have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless
Steel Phillips Rounded Head
Thread-Forming Screws for Plastic

More corrosion resistant than 18-8 stainless steel screws, these have excellent resistance to chemicals and salt water.

Steel Phillips Rounded Head
Thread-Forming Screws for Plastic

Stainless Steel Torx Rounded Head
Thread-Forming Screws for Plastic

18-8 stainless steel screws have good chemical resistance.

Steel Torx Rounded Head
Thread-Forming Screws for Plastic

These steel screws have a black-oxide or zinc-plated finish to resist corrosion.

Stainless Steel Flat Head
Thread-Forming Screws for Plastic

18-8 stainless steel screws have good chemical resistance.

Steel Flat Head Thread-Forming Screws for Plastic

These steel screws are beveled under the head for use in countersunk holes.

Hex Head Thread-Forming Screws for Plastic

Press threads into plastic to create a strong hold. Use a wrench, hex socket bit, or nutdriver to securely grip the hex head and tighten these screws.