Combination Drive Machine Screws

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Unified Standard Class 2A

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184 Products

Rounded Head Style

Pan

The most common rounded head style

120 products

Round

The domed top gives a smooth, finished appearance

64 products

Performance

Corrosion Resistant

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

120 products

Chemical Resistant

Maintain their strength when exposed to most chemicals

27 products

Steel Round Head Combination Phillips/Slotted Screws

With two common drive styles in a single screw, you'll always have a compatible driver on hand. A Phillips driver easily aligns with the cross-shaped opening on these screws, while a slotted driver works in a pinch. However, the combination drive won't handle as much torque as a dedicated Phillips drive can. The round head has a domed profile that gives a smooth, decorative look to brackets and architectural features.

Length is measured from under the head.

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

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				2-56

				1/4"	0.162"	0.069"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	00000


				3/8"	0.162"	0.069"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000




						4-40

						1/4"	0.211"	0.086"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000


						3/8"	0.211"	0.086"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000
						1/2"	0.211"	0.086"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000




								6-32

								1/4"	0.26"	0.103"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000


								3/8"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								1/2"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								5/8"	0.26"	0.103"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000
								3/4"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								1"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								1 1/4"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								1 1/2"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								2"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
								3"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
								4"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	50	000000000	0000




										8-32

										1/4"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000


										3/8"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
										1/2"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
										5/8"	0.309"	0.12"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000
										3/4"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
										1"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
										1 1/4"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
										1 1/2"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
										2"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
										2 1/2"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
										3"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000




										10-24

										3/8"	0.359"	0.137"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000


		1/2"	0.359"							0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
		5/8"	0.359"							0.137"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000
		3/4"	0.359"							0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
		1"	0.359"							0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
		1 1/4"	0.359"							0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
		1 1/2"	0.359"							0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
		2"	0.359"							0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
		3"	0.359"							0.137"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	00000
		4"	0.359"	0.137"						Fully Threaded	60,000	ASME B18.6.3	50	000000000	00000
		5"	0.359"	0.137"	Fully Threaded					60,000	ASME B18.6.3	25	000000000	00000




				10-32

				3/8"	0.359"					0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000


				1/2"	0.359"					0.137"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
				5/8"	0.359"	0.137"				Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000
				3/4"	0.359"	0.137"	Fully Threaded			60,000	ASME B18.6.3	100	000000000	0000
				1"	0.359"	0.137"	Fully Threaded			60,000	ASME B18.6.3	100	000000000	0000
				1 1/4"	0.359"	0.137"	Fully Threaded			60,000	ASME B18.6.3	100	000000000	0000
				1 1/2"	0.359"	0.137"	Fully Threaded			60,000	ASME B18.6.3	100	000000000	00000
				2"	0.359"	0.137"	Fully Threaded			60,000	ASME B18.6.3	100	000000000	00000
				3"	0.359"	0.137"	Fully Threaded			Not Rated	ASME B18.6.3	100	000000000	00000




						1/4"-20

						3/8"	0.472"			0.175"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000


						1/2"	0.472"			0.175"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
						5/8"	0.472"			0.175"	Fully Threaded	Not Rated	ASME B18.6.3	100	000000000	0000
						3/4"	0.472"			0.175"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	0000
						1"	0.472"			0.175"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
						1 1/4"	0.472"	0.175"		Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
						1 1/2"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
						1 3/4"	0.472"	0.175"	Fully Threaded	Not Rated	ASME B18.6.3	25	000000000	0000
						2"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	100	000000000	00000
						2 1/2"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	50	000000000	00000
						3"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	50	000000000	00000


						4"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	25	000000000	00000
						5"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	25	000000000	00000
						6"	0.472"	0.175"	Fully Threaded	60,000	ASME B18.6.3	25	000000000	00000




								3/8"-16

4"								0.708"	0.256"	Fully Threaded	60,000	ASME B18.6.3	5	000000000	00000


5"	0.708"							0.256"	Fully Threaded	Not Rated	ASME B18.6.3	10	000000000	0000
6"	0.708"							0.256"	Fully Threaded	Not Rated	ASME B18.6.3	10	000000000	0000

Stainless Steel Pan Head Combination Phillips/Slotted Screws

Our most corrosion-resistant combination Phillips/slotted screws. A Phillips driver easily aligns with the cross-shaped opening, while a slotted driver works in a pinch. However, the combination drive won't handle as much torque as a standard Phillips drive can. The pan head has 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.

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.

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







				2-56

				3/16"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000


				1/4"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
				5/16"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
				3/8"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
				1/2"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
				5/8"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
				3/4"	0.167"	0.063"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000




						4-40

						3/16"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000


						1/4"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
						5/16"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
						3/8"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
						1/2"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
						5/8"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
						3/4"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
						1"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000




								6-32

								3/16"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000


								1/4"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								5/16"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								3/8"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								1/2"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								5/8"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								3/4"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								1"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								1 1/4"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
								1 1/2"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000




										8-32

										1/4"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000


										5/16"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
										3/8"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
										1/2"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
5/8"										0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
3/4"	0.322"									0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
1"	0.322"									0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
1 1/4"	0.322"									0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
1 1/2"	0.322"									0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
1 3/4"	0.322"	0.115"								Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
2"	0.322"	0.115"	Fully Threaded							100,000	ASME B18.6.3	50	000000000	0000




		10-24

		5/16"	0.448"							0.128"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000


		3/8"	0.373"							0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
		1/2"	0.373"							0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
		5/8"	0.448"							0.128"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
		3/4"	0.373"							0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
		1"	0.373"							0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
		1 1/4"	0.373"	0.133"						Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
		1 1/2"	0.373"	0.133"	Fully Threaded					100,000	ASME B18.6.3	50	000000000	0000
		1 3/4"	0.373"	0.133"	Fully Threaded					100,000	ASME B18.6.3	50	000000000	0000
		2"	0.373"	0.133"	Fully Threaded					100,000	ASME B18.6.3	50	000000000	0000
		2 1/2"	0.373"	0.133"	Fully Threaded					100,000	ASME B18.6.3	50	000000000	00000


		3"	0.373"	0.133"	Fully Threaded					100,000	ASME B18.6.3	25	000000000	00000




				10-32

				1/4"	0.373"					0.133"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000


				5/16"	0.373"	0.133"				Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
				3/8"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	0000
				1/2"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	0000
				5/8"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	0000
				3/4"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	0000
				1"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	00000
				1 1/4"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	100	000000000	00000
				1 1/2"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	00000
				1 3/4"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	50	000000000	0000
				2 1/2"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	25	000000000	00000


				3"	0.373"	0.133"	Fully Threaded			100,000	ASME B18.6.3	25	000000000	00000




						12-24

						3/8"	0.511"	0.134"		Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000


						1/2"	0.511"	0.134"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000




								1/4"-20

								1/4"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000


								3/8"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
								1/2"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
								5/8"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
3/4"								0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	0000
1"	0.492"							0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	0000
1 1/4"	0.492"							0.175"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
1 1/2"	0.492"							0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	00000
1 3/4"	0.492"							0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	0000
2 1/2"	0.492"							0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	00000
3"	0.492"							0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	00000




								M3 × 0.5 mm

								6 mm	6 mm	2.52 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000


								8 mm	6 mm	2.52 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000
								10 mm	6 mm	2.52 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000
								12 mm	6 mm	2.52 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000
								20 mm	6 mm	2.52 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000
								25 mm	6 mm	2.52 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000




								M4 × 0.7 mm

								8 mm	8 mm	3.25 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000


								10 mm	8 mm	3.25 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000
								12 mm	8 mm	3.25 mm	Fully Threaded	80,000	DIN 7985	100	000000000	0000
								25 mm	8 mm	3.25 mm	Fully Threaded	80,000	DIN 7985	100	000000000	00000
								30 mm	8 mm	3.25 mm	Fully Threaded	80,000	DIN 7985	50	000000000	0000




										M5 × 0.8 mm

										10 mm	10 mm	4 mm	Fully Threaded	80,000	DIN 7985	100	000000000	00000


										12 mm	10 mm	3.95 mm	Fully Threaded	80,000	DIN 7985	100	000000000	00000
				20 mm						10 mm	4 mm	Fully Threaded	80,000	DIN 7985	50	000000000	00000
				25 mm	10 mm					4 mm	Fully Threaded	80,000	DIN 7985	50	000000000	00000
				30 mm	10 mm					4 mm	Fully Threaded	80,000	DIN 7985	50	000000000	00000




										M6 × 1 mm

										12 mm	12 mm	4.75 mm	Fully Threaded	80,000	DIN 7985	50	000000000	00000


						20 mm	12 mm			4.75 mm	Fully Threaded	80,000	DIN 7985	25	000000000	0000
						25 mm	12 mm			4.75 mm	Fully Threaded	80,000	DIN 7985	25	000000000	0000
						30 mm	12 mm			4.75 mm	Fully Threaded	80,000	DIN 7985	25	000000000	0000


						Highly Corrosion-Resistant 316 Stainless Steel







												4-40

												1/4"	0.219"	0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000


3/8"	0.219"											0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
1/2"	0.219"											0.08"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000




												6-32

												1/4"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000


												3/8"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
												1/2"	0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	0000
		3/4"										0.27"	0.097"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000




												8-32

												1/4"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000


												3/8"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
												1/2"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	100	000000000	00000
												3/4"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
												1"	0.322"	0.115"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000




												10-24

												3/8"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000


												1/2"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
												5/8"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
												3/4"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
				1"								0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000




												10-32

												3/8"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000


												1/2"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	0000
												5/8"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
												3/4"	0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000
						1"						0.373"	0.133"	Fully Threaded	100,000	ASME B18.6.3	50	000000000	00000




										1/4"-20

										1/2"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	0000


										3/4"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	00000
										1"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	00000
										1 1/4"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	25	000000000	00000
										1 1/2"	0.492"	0.175"	Fully Threaded	100,000	ASME B18.6.3	10	000000000	0000