No. 8 Drive Screws | McMaster-Carr

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57 Products

Tamper-Resistant Drilled Spanner Stainless Steel Flat Head Screws

Image of Product. Front orientation. Contains MultipleImages. Flat Head Screws. Tamper-Resistant Drilled Spanner Stainless Steel Flat Head Screws.

The unique two-hole design deters tampering. These screws only turn with a drilled spanner driver, making them hard to force with other tools. Also known as pig-nose drives, their two contact points won't withstand much torque, so they're good for light duty tasks. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals.

Length is measured from the top of the head.

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

Standard Profile—Standard-profile heads are the most common choice for flat head screws.

Undercut Profile—About a third thinner than standard heads, the undercut profile fits into shallow holes in thin material. The thin head also has more threading on the shaft, so they're often used to keep short screws from coming loose.

Screwdriver Bits—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.

	Screws											Screwdriver Bits		Power Tool Bits
				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				8-32

				1/4"	82°	Undercut	0.312"	0.070"	Fully Threaded	70,000	ASME B18.6.3	25	94063A315	00000	52775A22	00000	7230A57	00000


				5/16"	82°	Standard	0.332"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A316	00000	52775A22	0000	7230A57	0000
				3/8"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A192	0000	52775A22	0000	7230A57	0000
				1/2"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A194	00000	52775A22	0000	7230A57	0000
				5/8"	82°	Standard	0.332"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A317	00000	52775A22	0000	7230A57	0000
				3/4"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A197	00000	52775A22	0000	7230A57	0000
				1"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A199	00000	52775A22	0000	7230A57	0000
				1 1/4"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A201	00000	52775A22	0000	7230A57	0000
				1 1/2"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A203	00000	52775A22	0000	7230A57	0000
				2"	82°	Standard	0.312"	0.100"	Fully Threaded	70,000	ASME B18.6.3	25	94063A206	00000	52775A22	0000	7230A57	0000




						M4 × 0.7 mm

						6 mm	90°	Standard	7.50 mm	2.20 mm	Fully Threaded	80,000	—	25	94063A327	0000	52775A22	0000	7230A56	0000


						8 mm	90°	Standard	7.50 mm	2.20 mm	Fully Threaded	80,000	—	25	94063A328	00000	52775A22	0000	7230A56	0000
						10 mm	90°	Standard	7.50 mm	2.20 mm	Fully Threaded	80,000	—	25	94063A329	00000	52775A22	0000	7230A56	0000
						12 mm	90°	Standard	7.50 mm	2.20 mm	Fully Threaded	80,000	—	25	94063A330	00000	52775A22	0000	7230A56	0000
						16 mm	90°	Standard	7.50 mm	2.20 mm	Fully Threaded	80,000	—	25	94063A331	00000	52775A22	0000	7230A56	0000

Bit Sets

Hex Shank

Have a range of bits ready to turn the most common screw styles and sizes.

Hex Shank—Also known as insert bits, these snap into hand tools. If you want to use them with power tools, attach a bit adapter (not included).

Steel—Best for dry environments, since moisture will cause these bits to rust.

	Adapters Included	Drive Tools Included	Material	Container Type		Each
For Hand Tools







	1/4" Hex Shank Size

	38	1 Adapter 1 Drive Tool 36 Bits	Drilled Spanner: No. 4, No. 6, No. 8, No. 10 (1" O'all Lg.) Phillips: No. 1 (1" O'all Lg.) - 1 ea. Phillips: No. 2 (1" O'all Lg.) - 2 ea. Pozidriv®: No. 0, No. 1, No. 2, No. 3 (1" O'all Lg.) Slotted: 5/16" Square: No. 1, No. 2, No. 3 (1" O'all Lg.) Tamper-Resistant Hex: 5/64", 3/32", 7/64", 1/8", 9/64", 5/32" (1" O'all Lg.) Tamper-Resistant Torx: T8, T10, T15, T20, T25, T27, T30, T40 (1" O'all Lg.) Torq-Set®: No. 6, No. 8, No. 10 (1" O'all Lg.) Tri-Wing®: No. 1, No. 2, No. 3, No. 4 (1" O'all Lg.)	1/4" Hex Drive Adapter	3 1/2" Lg. Ratchet Wrench	Steel	Plastic Case	5996A4	000000


	100	4 Adapters 96 Bits	Drilled Spanner: No. 4, No. 6, No. 8, No. 10, No. 12, 1/4" (1" O'all Lg.)—1 ea. Hex (Inch): 0.050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8" (1" O'all Lg.)—1 ea. Hex (Metric): 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm (1" O'all Lg.)—1 ea. Phillips: No. 0 (1" O'all Lg.)—1 ea. Phillips: No. 1, No. 3 (1" O'all Lg.)—2 ea. Phillips: No. 2 (1" O'all Lg.)—4 ea. Pozidriv®: No. 1, No. 2, No. 3 (1" O'all Lg.)—1 ea. Screw-In Hook Driver Bit—1 ea. Slotted: 3/32", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 3/8" (1" O'all Lg.)—1 ea. Square: No. 0, No. 1, No. 2, No. 3, No. 4 (1" O'all Lg.)—1 ea. Tamper-Resistant Hex (Inch): 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" (1" O'all Lg.)—1 ea. Tamper-Resistant Hex (Metric): 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm (1" O'all Lg.)—1 ea. Tamper-Resistant Torx: T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40 (1" O'all Lg.)—1 ea. Torx: T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40, T45, T50, T55 (1" O'all Lg.)—1 ea.	1/4" Male Square Drive × 1/4" Hex Shank Adapter (1" O'all Lg.) 1/4" Male Square Drive × 1/4" Hex Shank Adapter (2" O'all Lg.) 2 1/2" Lg. Bit Adapter for Power Tools Bit Adapter for Square Drive Tools	—	Steel	Plastic Case	2599N1	00000

Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws

The unique two-hole design inhibits tampering. These screws only turn with a drilled spanner driver, making them hard to force with other tools. Also known as pig-nose drives, their two contact points won't withstand much torque, so they're good for light duty tasks. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals. Pan heads have a moderate height and width profile, offering a middle ground between narrower button heads and wider truss heads.

Length is measured from under the head.

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

Screwdriver Bits—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.

	Screws									Screwdriver Bits		Power Tool Bits
		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				8-32

				1/4"	0.322"	0.096"	Fully Threaded	80,000	—	25	94066A851	000000	52775A22	00000	7230A57	00000


				3/8"	0.322"	0.096"	Fully Threaded	80,000	ASME B18.6.3	25	94066A192	00000	52775A22	0000	7230A57	0000
				1/2"	0.322"	0.096"	Fully Threaded	80,000	ASME B18.6.3	25	94066A195	00000	52775A22	0000	7230A57	0000
				5/8"	0.322"	0.096"	Fully Threaded	80,000	—	25	94066A852	00000	52775A22	0000	7230A57	0000
				3/4"	0.322"	0.096"	Fully Threaded	80,000	ASME B18.6.3	25	94066A197	00000	52775A22	0000	7230A57	0000
				1"	0.322"	0.096"	Fully Threaded	80,000	ASME B18.6.3	25	94066A199	00000	52775A22	0000	7230A57	0000
				1 1/4"	0.322"	0.096"	Fully Threaded	80,000	ASME B18.6.3	25	94066A201	00000	52775A22	0000	7230A57	0000
				1 1/2"	0.322"	0.096"	Fully Threaded	80,000	ASME B18.6.3	25	94066A203	00000	52775A22	0000	7230A57	0000




						M4 × 0.7 mm

						6 mm	8 mm	2.4 mm	Fully Threaded	80,000	—	25	94066A611	00000	52775A22	0000	7230A56	0000


						8 mm	8 mm	2.4 mm	Fully Threaded	80,000	—	25	94066A612	00000	52775A22	0000	7230A56	0000
						10 mm	8 mm	2.4 mm	Fully Threaded	80,000	—	25	94066A613	00000	52775A22	0000	7230A56	0000
						12 mm	8 mm	2.4 mm	Fully Threaded	80,000	—	25	94066A614	00000	52775A22	0000	7230A56	0000
						16 mm	8 mm	2.4 mm	Fully Threaded	80,000	—	25	94066A615	00000	52775A22	0000	7230A56	0000

Tamper-Resistant Drilled Spanner Stainless Steel Truss Head Screws

These screws have a wide head that distributes weight and a two-hole design that deters tampering. They only turn with a drilled spanner driver, making them hard to force with other tools. Also known as pig-nose drives, their two contact points won't withstand much torque, so they're good for light duty tasks. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals. Their wide head spreads out pressure without adding a washer to reduce the risk of crushing thin material, such as sheet metal.

Length is measured from under the head.

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

Screwdriver Bits—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.

	Screws									Screwdriver Bits		Power Tool Bits
		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				8-32

				1/4"	0.384"	0.102"	Fully Threaded	70,000	—	25	94135A816	000000	52775A22	00000	7230A57	00000


				3/8"	0.384"	0.102"	Fully Threaded	70,000	—	25	94135A817	00000	52775A22	0000	7230A57	0000
				1/2"	0.384"	0.102"	Fully Threaded	70,000	ASME B18.6.3	10	94135A121	0000	52775A22	0000	7230A57	0000
				3/4"	0.384"	0.102"	Fully Threaded	70,000	ASME B18.6.3	10	94135A123	0000	52775A22	0000	7230A57	0000
				1"	0.384"	0.102"	Fully Threaded	70,000	ASME B18.6.3	10	94135A125	0000	52775A22	0000	7230A57	0000
				1 1/4"	0.384"	0.102"	Fully Threaded	70,000	ASME B18.6.3	10	94135A127	0000	52775A22	0000	7230A57	0000
				1 1/2"	0.384"	0.102"	Fully Threaded	70,000	ASME B18.6.3	10	94135A130	0000	52775A22	0000	7230A57	0000
				2 1/2"	0.384"	0.102"	Partially Threaded	70,000	ASME B18.6.3	10	94135A135	0000	52775A22	0000	7230A57	0000

Bit Screwdrivers

Magnet Bit Holder

Don't lug around a toolbox full of drivers—just swap out the bit to drive multiple screw sizes and styles with one tool. The ultimate space savers, these bit screwdrivers are a smart solution for on-the-go jobs.

					Shaft		Bit
No. of Sizes	Sizes Included	For Bit Hex Shank Size	Overall Lg.	Material	Lg.	Overall Wd.	Material	Holding Mechanism	Grip Style		Each
26	Drilled Spanner: No. 4, No. 6, No. 8, No. 10 Tamper-Resistant Hex: 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 2 mm, 2.5 mm, 3 mm, 5 mm Tamper-Resistant Torx: T7, T8, T10, T15, T20, T25, T27, T30, T40 Torq-Set®: No. 6, No. 8, No. 10	1/4"	8 1/2"	Stainless Steel	3 3/8"	5/16"	Steel	Magnet	Cushion	7262A49	000000

Tamper-Resistant Drilled Spanner Stainless Steel Rounded Head Screws for Sheet Metal

Image of Product. Front orientation. Contains MultipleImages. Tapping Screws. Tamper-Resistant Drilled Spanner Stainless Steel Rounded Head Screws for Sheet Metal.

A two-hole drive deters tampering and a rounded head creates a finished look. Also known as pig-nose screws, these turn only with a drilled spanner driver. The two contact points won’t withstand much torque, so they’re best for light duty fastening. The pointed tip starts a hole in sheet metal up to 0.025" thick, but for thicker material you’ll need to drill first. These screws resist corrosion.

Length is measured from under 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.

Screwdriver Bits—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tools Bits—Pair with your power tools to turn screws more quickly than manual tools.

	Tapping Screws										Screwdriver Bits		Power Tools Bits
		Head
	Lg.	Dia.	Ht.	Tapping Screw Type	Drive Size	Approx. Threads per In.	Drill Bit Size	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				No. 8 Screw Size

				3/8"	0.322"	0.096"	AB	No. 8	15	29 Ga.	25	94065A192	00000	52775A22	00000	7230A57	00000


				1/2"	0.322"	0.096"	AB	No. 8	15	29 Ga.	25	94065A194	0000	52775A22	0000	7230A57	0000
				3/4"	0.322"	0.096"	AB	No. 8	15	29 Ga.	25	94065A197	0000	52775A22	0000	7230A57	0000
				1"	0.322"	0.096"	AB	No. 8	15	29 Ga.	25	94065A199	0000	52775A22	0000	7230A57	0000
				1 1/2"	0.322"	0.096"	AB	No. 8	15	29 Ga.	25	94065A203	00000	52775A22	0000	7230A57	0000
				2"	0.322"	0.096"	AB	No. 8	15	29 Ga.	25	94065A205	00000	52775A22	0000	7230A57	0000

Tamper-Resistant Drilled-Spanner Stainless Steel Flat Head Screws for Sheet Metal

Image of Product. Front orientation. Contains MultipleImages. Tapping Screws. Tamper-Resistant Drilled-Spanner Stainless Steel Flat Head Screws for Sheet Metal.

A two-hole drive deters tampering with screws that install in countersunk holes. Also known as pig-nose screws, these require a drilled spanner driver to turn them. However, the two contact points won’t withstand much torque, so they’re best for light duty fastening. They have a flat, beveled head to sit flush with surfaces. The pointed tip starts a hole in sheet metal up to 0.025" thick, but for thicker material you’ll need to drill first. Made of stainless steel, these screws resist corrosion.

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.

Screwdriver Bits—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tools Bits—Pair with your power tools to turn screws more quickly than manual tools.

	Tapping Screws												Screwdriver Bits		Power Tools Bits
		Head
	Lg.	Dia.	Ht.	Tapping Screw Type	Drive Size	Approx. Threads per In.	Countersink Angle	Flat Head Profile	Drill Bit Size	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				No. 8 Screw Size

				1/2"	0.332"	0.1"	AB	No. 8	15	82°	Standard	29 Ga.	25	95115A120	00000	52775A22	00000	7230A57	00000


				3/4"	0.332"	0.1"	AB	No. 8	15	82°	Standard	29 Ga.	25	95115A122	0000	52775A22	0000	7230A57	0000
				1"	0.332"	0.1"	AB	No. 8	15	82°	Standard	29 Ga.	25	95115A124	0000	52775A22	0000	7230A57	0000
				1 1/4"	0.332"	0.1"	AB	No. 8	15	82°	Standard	29 Ga.	25	95115A125	00000	52775A22	0000	7230A57	0000
				1 1/2"	0.332"	0.1"	AB	No. 8	15	82°	Standard	29 Ga.	25	95115A205	00000	52775A22	0000	7230A57	0000

Torq-Set® Bit Sets


Hex Shank	Quick-Change Hex Shank

Similar to Phillips bits, but with offset wings for a better grip. The bits in these sets are less likely to slip out of the screw head and damage the fastener.

Hex Shank—Also known as insert bits, these snap into hand tools. If you want to use them with power tools, attach a bit adapter (not included).

Quick-Change Hex Shank—Lock these bits directly into power tools. They won't wobble as much as bits paired with an adapter, so they are the best choice for high-precision tasks.

Steel—Best for dry environments, since moisture will cause these bits to rust.

	Container Type		Each
For Hand Tools







	1/4" Hex Shank Size

	10 Bits	Torq-Set®: No. 4, No. 6, No. 8, No. 10, 1/4" (1" O'all Lg.)—2 ea.	Steel	—	36735A75	000000


	For Power Tools







					1/4" Quick-Change Hex Shank Size

					10 Bits	Torq-Set®: No. 4, No. 6, No. 8, No. 10, 1/4" (1 1/4" O'all Lg.)—2 ea.	Steel	Plastic Caddy	56075A53	00000

Tri-Wing® Bits

Hex Shank

Use these bits to turn Tri-Wing® screws, which are commonly found on electronics. They have offset wings that withstand high torque without slipping and damaging the drive.

Hex Shank—Also known as insert bits, these snap into hand tools. If you want to use them with power tools, attach a bit adapter (not included).

Steel—Best for dry environments, since moisture will cause these bits to rust.

	Material		Each
For Hand Tools







	1/4" Hex Shank Size

	No. 8	3/8"	1 1/4"	Steel	7175A54	000000

Plain-Grip Screwdrivers

Ideal for industrial maintenance, these no-frills screwdrivers withstand years of heavy use in the shop and on the jobsite. The hard plastic handle won't crack or wear out from drops and scrapes. It's also easy to wipe down and won't get sticky or gummy when exposed to oils or chemicals, unlike a soft handle.

Premium—The best screwdrivers available, with tips machined to tight tolerances for the tightest possible fit in fastener recesses. The snug fit means they'll turn screws quickly without slippage, which would wear on screw heads and the driver's tip.

Standard Length—The most common screwdriver length for a specific drive size.

				Shaft
	Drive Size	Relative Lg.	Overall Lg.	Lg.	Overall Wd.	Material	Mfr.		Each
Drilled Spanner







				Premium

				No. 8	Standard	8"	4"	1/4"	Steel	Allegheny Bolt & Screw	94062A116	000000