T20 Wood Screws | McMaster-Carr

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Corrosion-Resistant Coated

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Countersink Angle

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0.266"

0.323"

0.385"

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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5 Products

Fastener Head Type

Flat

Screws that sit flush, so you won't need to worry about snags

4 products

Rounded

Sit just above the surface for a low-profile finish and tight hold

1 product

Performance

Corrosion Resistant

Resist corrosion from moisture, chemicals, and harsh weather

2 products

Distortion-Free

Reverse threads pull stray material inward to avoid bulging on surface

1 product

Steel Torx Flat Head Wood Screws

Turn up the torque without slipping and stripping drives. Also known as star drives, these Torx screws withstand more torque than screws with a slotted, Phillips, square, or hex drive. The flat head sits flush, so you won't need to worry about snags.

Drill a pilot hole slightly smaller than the screw to prevent splitting. Length is measured from the top of the head.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

		Head
	Lg.	Dia.	Ht.	Softwood Drill Bit Size	Hardwood Drill Bit Size	Countersink Angle	Flat Head Profile	Approx. Threads per In.	Threading	Tapping Method	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				No. 10

				3/4"	0.385"	0.116"	3/32"	7/64"	82°	Standard	12	Partially Threaded	Thread Forming	100	3597N18	000000


				1"	0.385"	0.116"	3/32"	7/64"	82°	Standard	12	Partially Threaded	Thread Forming	100	3597N19	00000
				2"	0.385"	0.116"	3/32"	7/64"	82°	Standard	12	Partially Threaded	Thread Forming	100	3597N21	00000

Steel Torx Flat Head Screws for Wood and Composite Wood

The thin head reduces surface damage and leaves a smooth, near-invisible finish on decking and trim. These screws are also known as trim head screws. With a deep six-lobe opening, their Torx drive handles more torque than slotted, Phillips, and hex drives. The flat head creates a discreet look in countersunk holes and deters snags.

Drill a pilot hole slightly smaller than the screw to prevent splitting. Length is measured from the top of the head.

Green Corrosion-Resistant-Coated Steel—The coating has been tested to extreme standards, including 1,500 hours of salt spray resistance, to hold up in wet and outdoor environments.

		Head
	Lg.	Dia.	Ht.	Drill Bit Size	Flat Head Profile	Approx. Threads per In.	Threading	Tapping Method	Pkg. Qty.		Pkg.
Green Corrosion-Resistant-Coated Steel







				No. 8

				2"	0.323"	0.125"	5/32"	Narrow	10	Partially Threaded	Thread Cutting	50	91520A323	000000

Distortion-Free Screws for Composite Wood

Reverse threads pull stray material inward when fastening composite wood instead of letting it bulge out to the surface. The flat underside of the pancake head creates a strong hold without the need for a countersunk hole. The Torx drive handles more torque than slotted, Phillips, and hex drives.

The screw drill tip acts as a built-in pilot, though pilot holes are still recommended near edges to avoid splitting. Length is measured from the top of the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head
	Lg.	Dia.	Ht.	Drill Bit Size	Rounded Head Profile	Approx. Threads per In.	Threading	Tapping Method	Tapping Screw Type Designation	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				No. 10

				2 3/4"	0.266"	0.11"	3/32"	Narrow	13	Fully Threaded	Thread Cutting	17	25	98419A440	000000