6-40 Thread Rounded Head Screws

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DFARS Specialty Metals

Rounded Head Profile

Tensile Strength

60,000 psi to 79,999 psi

80,000 psi to 99,999 psi

120,000 psi or greater

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22 Products

Rounded Head Style

Pan

The most common rounded head style

12 products

Button

The low, compact profile takes up little space

10 products

Performance

Corrosion Resistant

Stay strong when exposed to moisture, chemicals, and harsh weather

19 products

Conductive

Conduct electricity better than other screws

3 products

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.

Military Specification—These screws are manufactured and tested to meet strict U.S. military standards for material and construction.

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







				6-40

				3/16"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	25	000000000	00000


				1/4"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	25	000000000	0000
				1/4"	0.27"	0.097"	Fully Threaded	80,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, NASM51958	MS51958-26	25	000000000	00000
				5/16"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	25	000000000	0000
				5/16"	0.27"	0.097"	Fully Threaded	80,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, NASM51958	MS51958-27	25	000000000	00000
				3/8"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	25	000000000	0000
				3/8"	0.27"	0.097"	Fully Threaded	80,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, NASM51958	MS51958-28	25	000000000	00000
				7/16"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	25	000000000	0000
				1/2"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	25	000000000	0000
				5/8"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	100	000000000	0000
				3/4"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	100	000000000	0000


				1"	0.27"	0.097"	Fully Threaded	70,000	ASME B18.6.3	—	100	000000000	0000

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	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				6-40

				3/16"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	10	000000000	00000


				1/4"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	10	000000000	0000
				3/8"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	10	000000000	0000
				1/2"	0.262"	0.073"	Fully Threaded	70,000	—	1	000000000	0000

Brass Button Head Hex-Drive Screws

These button head 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. 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.
Brass







				6-40

				3/16"	0.262"	0.073"	Fully Threaded	50,000	1	000000000	00000


				1/4"	0.262"	0.073"	Fully Threaded	50,000	1	000000000	0000
				3/8"	0.262"	0.073"	Fully Threaded	50,000	1	000000000	0000

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.

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.

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







				6-40

				1/4"	0.262"	0.073"	Fully Threaded	120,000	ASME B18.3, ASTM F835	25	000000000	000000


				3/8"	0.262"	0.073"	Fully Threaded	120,000	ASME B18.3, ASTM F835	25	000000000	00000
				1/2"	0.262"	0.073"	Fully Threaded	120,000	ASME B18.3, ASTM F835	25	000000000	00000