1-64 Screws | McMaster-Carr

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74 Products

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Steel Socket Head Screws

Fully Threaded

Partially Threaded

Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.

Length is measured from under the head.

Black-Oxide Alloy Steel—Best for dry environments since moisture will cause these screws to rust. They have a dark, matte appearance.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				1-64

				1/8"	0.118"	0.073"	Fully Threaded	Coarse	170,000	10	90044A280	00000


				3/16"	0.118"	0.073"	Fully Threaded	Coarse	170,000	10	90044A281	00000
				1/4"	0.118"	0.073"	Fully Threaded	Coarse	170,000	10	90044A282	00000
				3/8"	0.118"	0.073"	Fully Threaded	Coarse	170,000	10	90044A283	00000
				1/2"	0.118"	0.073"	Fully Threaded	Coarse	170,000	10	90044A284	00000
				5/8"	0.118"	0.073"	Fully Threaded	Coarse	170,000	5	90044A285	00000
				3/4"	0.118"	0.073"	Fully Threaded	Coarse	170,000	5	90044A286	00000
				1"	0.118"	0.073"	Partially Threaded	Coarse	170,000	5	90044A287	00000

Stainless Steel Button Head Hex-Drive Screws

These button head screws won't corrode from moisture and chemicals, but they aren't as strong as alloy steel screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver.

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.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/8"	0.129"	0.033"	Fully Threaded	70,000	25	92949A314	00000


				3/16"	0.129"	0.033"	Fully Threaded	70,000	25	92949A315	0000
				1/4"	0.129"	0.033"	Fully Threaded	70,000	100	92949A316	0000
				3/8"	0.129"	0.033"	Fully Threaded	70,000	100	92949A889	0000
				1/2"	0.129"	0.033"	Fully Threaded	70,000	100	92949A890	0000
				3/4"	0.129"	0.033"	Fully Threaded	70,000	50	92949A891	0000

Stainless Steel Socket Head Screws

Fully Threaded

These screws won't rust or corrode when exposed to moisture and chemicals. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

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 screws can.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/8"	0.118"	0.073"	Fully Threaded	Coarse	70,000	50	92196A451	00000


				3/16"	0.118"	0.073"	Fully Threaded	Coarse	70,000	50	92196A061	0000
				1/4"	0.118"	0.073"	Fully Threaded	Coarse	70,000	50	92196A459	0000
				5/16"	0.118"	0.073"	Fully Threaded	Coarse	70,000	50	92196A062	0000
				3/8"	0.118"	0.073"	Fully Threaded	Coarse	70,000	50	92196A064	0000
				1/2"	0.118"	0.073"	Fully Threaded	Coarse	70,000	100	92196A424	00000
				5/8"	0.118"	0.073"	Fully Threaded	Coarse	70,000	25	90696A156	0000

Stainless Steel Pan Head Phillips Screws

These stainless steel pan head Phillips screws won't rust or corrode when exposed to moisture and chemicals. They have a moderate height and width profile, offering a middle ground between narrower button heads and wider truss heads. The Phillips drive easily aligns with drivers and withstands more torque than slotted drives, but drivers slip when you apply too much force.

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.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/4"	0.142"	0.053"	Fully Threaded	70,000	100	91772A166	00000


				5/16"	0.142"	0.053"	Fully Threaded	70,000	100	91772A502	00000
				3/8"	0.142"	0.053"	Fully Threaded	70,000	100	91772A168	0000
				1/2"	0.142"	0.053"	Fully Threaded	70,000	100	91772A170	00000

Stainless Steel Phillips Flat Head Screws

These screws are made of stainless steel, so they won't rust or corrode when exposed to moisture and chemicals. The Phillips drive has a cross-shaped opening in which a driver fits snugly for easy alignment. With four contact points, they withstand more torque than slotted drives, but drivers slip when you apply too much force.

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.

				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/8"	82°	Undercut	0.137"	0.031"	Fully Threaded	80,000	100	91771A063	00000


				3/16"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	100	91771A065	0000
				1/4"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	100	91771A066	0000
				3/8"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	100	91771A068	0000
				1/2"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	100	91771A070	00000
				3/4"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	50	91771A176	0000

Steel Hex-Drive Flat Head Screws

Our strongest hex-drive flat head screws. They're made of alloy steel, so they have nearly twice the tensile strength of other screws. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver without slipping and stripping the drive.

Length is measured from the top of the head.

Black-Oxide Alloy Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

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

				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				1-64

				1/8"	82°	Undercut	0.168"	0.031"	Fully Threaded	130,000	10	91253A486	000000


				3/16"	82°	Standard	0.168"	0.054"	Fully Threaded	130,000	10	91253A971	00000
				1/4"	82°	Standard	0.168"	0.054"	Fully Threaded	130,000	10	91253A972	00000

Stainless Steel Hex-Drive Flat Head Screws

The most corrosion-resistant hex-drive flat head screws we offer. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals, but they're not as strong as alloy steel. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver without slipping and stripping the drive.

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.

				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				3/16"	82°	Standard	0.168"	0.054"	Fully Threaded	70,000	50	92210A358	00000


				1/4"	82°	Standard	0.168"	0.054"	Fully Threaded	70,000	50	92210A361	0000
				3/8"	82°	Standard	0.168"	0.054"	Fully Threaded	70,000	50	92210A364	0000

Stainless Steel Round Head Phillips Screws

The most corrosion-resistant round head Phillips screws we offer. The round head has a domed profile that gives a smooth, decorative look to brackets and architectural features. The Phillips drive easily aligns with drivers and withstands more torque than slotted drives, but drivers slip when you apply too much force.

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.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				3/16"	0.137"	0.061"	Fully Threaded	100,000	100	91773A165	00000


				1/4"	0.137"	0.061"	Fully Threaded	100,000	100	91773A166	00000
				3/8"	0.137"	0.061"	Fully Threaded	100,000	100	91773A168	00000
				1/2"	0.137"	0.061"	Fully Threaded	100,000	100	91773A170	00000
				1"	0.137"	0.061"	Fully Threaded	100,000	50	91773A175	0000

Sealing Socket Head Screws

Fully Threaded

Keep out dust and contaminants and lock in air and fluid. As you tighten these corrosion-resistant screws, a rubber O-ring under the head compresses to form a tight seal. The deep, six-point socket keeps hex keys from slipping out and damaging the drive.

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 screws can.

Buna-N O-Ring—These seals won't swell or soften when they touch oil, grease, or fuel.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Max. Pressure, psi	O-Ring Temp. Range, ° F		Each
18-8 Stainless Steel with Buna-N O-Ring







				1-64

				1/4"	0.116"	0.073"	Fully Threaded	Coarse	100,000	1,500	-40 to 225	95198A256	00000

Steel Cup-Tip Set Screws

Made of alloy steel, these screws are strong enough to hold components without wearing down. The tip has thin edges that dig into surfaces for a secure hold. They often lock gears, pulleys, and other transmission components onto shafts.

Black-Oxide Alloy Steel—These screws have a dark matte finish that offers minimal corrosion resistance, so they're best for dry environments.

	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







	1-64

	1/8"	0.035"	Rockwell C45	10	91375A018	00000


	3/16"	0.035"	Rockwell C45	10	91375A019	0000
	1/4"	0.035"	Rockwell C45	10	91375A020	00000

Steel Button Head Hex-Drive Screws

Made of alloy steel, these screws have nearly twice the tensile strength of other steel screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver.

Length is measured from under the head.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				1-64

				1/4"	0.139"	0.039"	Fully Threaded	120,000	10	91255A013	00000

Stainless Steel Hex-Drive Shoulder Screws

These screws hold up against moisture and chemicals better than their steel counterparts, but they aren't as strong.

Check out our Made-to-Order Stainless Steel Hex-Drive Shoulder Screws if you don't see the shoulder length you need.

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

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these screws won't degrade when exposed to harsh weather, salt water, and most chemicals.

Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. Even if the coating wears off, these screws will hold up against corrosive agents in most environments, including salt water and most chemicals.

				Head				Certificate			Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Type	Form		1-4	5-Up
18-8 Stainless Steel







				3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				1/8"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97832A249	00000	00000


				5/32"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A250	0000	0000
				1/4"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A251	0000	0000


				Highly Corrosion-Resistant 316 Stainless Steel







								3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

								1/8"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A133	0000	0000


								5/32"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A138	00000	0000
								1/4"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A158	00000	0000
								5/16"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A180	00000	0000


								Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel







												3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

												1/8"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A162	00000	00000


												5/32"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A159	00000	00000
												1/4"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A161	00000	00000
												5/16"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A163	00000	00000

Made-to-Order Shoulder Screws

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

				Head						Each
	Choose a Shoulder Length	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Material Certificate Form		1-4	5-9	10-Up
18-8 Stainless Steel







				3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				0.13" to 1.99"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Digital	92183A111	000000	000000	00000

Stainless Steel Slotted Flat Head Screws

The most corrosion-resistant slotted flat head screws we offer. Made of stainless steel, they won't rust or corrode when exposed to moisture or chemicals. With only two contact points, the slotted drive is the most basic drive style. The slot can't withstand much torque, so it's best to hand-tighten them instead of using power tools.

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.

				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/8"	82°	Undercut	0.137"	0.031"	Fully Threaded	80,000	50	91781A063	00000


				3/16"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	50	91781A065	0000
				1/4"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	50	91781A066	0000
				1"	82°	Standard	0.137"	0.043"	Fully Threaded	80,000	50	91781A177	00000

Brass Pan Head Phillips Screws

These pan head Phillips screws have a shiny look and won't rust in damp environments. Made of brass, they're also conductive and nonmagnetic, making them useful for electrical applications. Pan heads have a moderate height and width profile, offering a middle ground between narrower button heads and wider truss heads. The Phillips drive easily aligns with drivers and withstands more torque than slotted drives, but drivers slip when you apply too much force.

Length is measured from under the head.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
Brass







				1-64

				1/4"	0.142"	0.053"	Fully Threaded	50,000	50	94070A043	00000


				3/8"	0.142"	0.053"	Fully Threaded	50,000	50	94070A047	0000
				1/2"	0.142"	0.053"	Fully Threaded	50,000	50	94070A051	00000

Stainless Steel Pan Head Slotted Screws

The most corrosion-resistant pan head slotted screws we offer. They have a moderate height and width profile, offering a middle ground between narrower button heads and wider truss heads. With only two contact points, the slotted drive can't withstand much torque, so it's best to hand-tighten them.

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.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/4"	0.142"	0.046"	Fully Threaded	100,000	50	91792A166	00000


				3/8"	0.142"	0.046"	Fully Threaded	100,000	50	91792A168	0000
				1/2"	0.142"	0.046"	Fully Threaded	100,000	50	91792A170	0000

Stainless Steel Round Head Slotted Screws

Our most corrosion-resistant round head slotted screws. The round head has a domed profile that gives a smooth, decorative look to brackets and architectural features. With only two contact points, the slotted drive can't withstand much torque, so it's best to hand-tighten them.

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.

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1-64

				1/8"	0.138"	0.061"	Fully Threaded	100,000	50	91783A063	00000


				3/16"	0.138"	0.061"	Fully Threaded	100,000	50	91783A165	0000
				1/4"	0.138"	0.061"	Fully Threaded	100,000	50	91783A166	0000
				1"	0.138"	0.061"	Fully Threaded	100,000	50	91783A175	00000

Made-to-Order Stainless Steel Hex-Drive Shoulder Screws

Specify the exact shoulder length you need in screws that won't rust. These are ideal for replacing fasteners in older machines or for testing prototypes.

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

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

				Head				Certificate			Each
	Choose a Shoulder Length	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Type	Form		1-4	5-9	10-Up
18-8 Stainless Steel







				3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				0.13" to 1.99"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	92183A111	000000	000000	00000


				2.00" to 3.99"	1-64	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	92183A121	00000	00000	0000