Undercut Head Socket Cap Screws

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169 Products

Drive Style

Hex

Six contact points securely grip your driver without stripping the drive

166 products

Tamper-Resistant Hex

A pin in the drive deters unauthorized access

3 products

Performance

Tamper Resistant

Prevent unauthorized access, damage, and vandalism

3 products

Corrosion Resistant

Resist corrosion from moisture, chemicals, and harsh weather

154 products

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.

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 in just about any environment, including salt water and most chemicals.

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







				4-40

				1/8"	82°	Undercut	0.212"	0.047"	Fully Threaded	70,000	—	10	000000000	000000


				3/16"	82°	Undercut	0.255"	0.047"	Fully Threaded	70,000	ASME B18.3, ASTM F879	100	000000000	0000
				3/16"	100°	Undercut	0.255"	0.059"	Partially Threaded	70,000	—	1	000000000	0000
				1/4"	100°	Undercut	0.255"	0.059"	Partially Threaded	70,000	—	1	000000000	0000
				5/16"	100°	Undercut	0.255"	0.059"	Partially Threaded	70,000	—	1	000000000	0000
				3/8"	100°	Undercut	0.255"	0.059"	Partially Threaded	70,000	—	1	000000000	0000
				1/2"	100°	Undercut	0.255"	0.059"	Partially Threaded	70,000	—	1	000000000	0000




						6-32

						3/16"	82°	Undercut	0.307"	0.059"	Fully Threaded	70,000	ASME B18.3	25	000000000	0000


						1/4"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000
						5/16"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000
						3/8"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000
						1/2"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000
						5/8"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000
						3/4"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000
						1"	100°	Undercut	0.307"	0.066"	Partially Threaded	70,000	—	1	000000000	0000




								8-32

								1/4"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000


								5/16"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000
								3/8"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000
								1/2"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000
								5/8"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000
								3/4"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000
								1"	100°	Undercut	0.359"	0.076"	Partially Threaded	70,000	—	1	000000000	0000




										10-24

										1/4"	82°	Undercut	0.411"	0.081"	Fully Threaded	70,000	ASME B18.3	25	000000000	0000


										3/8"	100°	Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
										1/2"	100°	Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
										5/8"	100°	Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
										3/4"	100°	Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
										1"	100°	Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000




										10-32

		1/4"								82°	Undercut	0.411"	0.081"	Fully Threaded	70,000	ASME B18.3	50	000000000	0000


		3/8"	100°							Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
		1/2"	100°							Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
		5/8"	100°							Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
		3/4"	100°							Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
		1"	100°							Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000
		1 1/2"	100°							Undercut	0.411"	0.084"	Partially Threaded	70,000	—	1	000000000	0000




										1/4"-20

				1/4"						82°	Undercut	0.531"	0.161"	Partially Threaded	70,000	—	1	000000000	0000


				3/8"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				1/2"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				5/8"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				3/4"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				7/8"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				1"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				1 1/4"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				1 1/2"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	0000
				1 3/4"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	00000
				2"	100°					Undercut	0.531"	0.105"	Partially Threaded	70,000	—	1	000000000	00000




						5/16"-18

						5/8"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	0000


						3/4"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	0000
						1"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	0000
						1 1/4"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	0000
						1 1/2"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	0000
						1 3/4"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	00000
						2"	100°			Undercut	0.656"	0.127"	Partially Threaded	70,000	—	1	000000000	00000




								3/8"-16

								3/4"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	0000


								1"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	0000
								1 1/4"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	0000
								1 1/2"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	00000
								1 3/4"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	00000
								2"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	00000
								2 1/2"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	00000
								3"	100°	Undercut	0.781"	0.157"	Partially Threaded	70,000	—	1	000000000	00000




								1/2"-13

								1"	100°	Undercut	0.937"	0.181"	Partially Threaded	70,000	—	1	000000000	0000


								1 1/4"	100°	Undercut	0.937"	0.181"	Partially Threaded	70,000	—	1	000000000	00000
								1 1/2"	100°	Undercut	0.937"	0.181"	Partially Threaded	70,000	—	1	000000000	00000
								2"	100°	Undercut	0.937"	0.181"	Partially Threaded	70,000	—	1	000000000	00000


								Highly-Corrosion-Resistant 316 Stainless Steel







										4-40

										3/16"	100°	Undercut	0.255"	0.059"	Fully Threaded	70,000	—	5	000000000	00000


										1/4"	100°	Undercut	0.255"	0.059"	Fully Threaded	70,000	—	5	000000000	00000
										5/16"	100°	Undercut	0.255"	0.059"	Fully Threaded	70,000	—	5	000000000	00000
										3/8"	100°	Undercut	0.255"	0.059"	Fully Threaded	70,000	—	5	000000000	00000
										1/2"	100°	Undercut	0.255"	0.059"	Fully Threaded	70,000	—	5	000000000	00000




				6-32

				1/4"	100°							Undercut	0.307"	0.066"	Fully Threaded	70,000	—	5	000000000	00000


				5/16"	100°							Undercut	0.307"	0.066"	Fully Threaded	70,000	—	5	000000000	00000
				3/8"	100°							Undercut	0.307"	0.066"	Fully Threaded	70,000	—	1	000000000	0000
				1/2"	100°							Undercut	0.307"	0.066"	Fully Threaded	70,000	—	1	000000000	0000
				3/4"	100°							Undercut	0.307"	0.066"	Fully Threaded	70,000	—	1	000000000	0000




												8-32

												3/8"	100°	Undercut	0.359"	0.076"	Fully Threaded	70,000	—	1	000000000	0000


						1/2"	100°					Undercut	0.359"	0.076"	Fully Threaded	70,000	—	1	000000000	0000
						3/4"	100°					Undercut	0.359"	0.076"	Fully Threaded	70,000	—	1	000000000	0000




												10-24

												1/4"	82°	Undercut	0.411"	0.081"	Fully Threaded	70,000	ASME B18.3	10	000000000	0000




10-32

1/4"	82°													Undercut	0.411"	0.089"	Fully Threaded	70,000	ASME B18.3, ASTM F879	25	000000000	0000


3/8"	100°													Undercut	0.411"	0.084"	Fully Threaded	70,000	—	1	000000000	0000
1/2"	100°													Undercut	0.411"	0.084"	Fully Threaded	70,000	—	1	000000000	0000
5/8"	100°													Undercut	0.411"	0.084"	Fully Threaded	70,000	—	1	000000000	0000
3/4"	100°													Undercut	0.411"	0.084"	Fully Threaded	70,000	—	1	000000000	0000
1"	100°													Undercut	0.411"	0.084"	Fully Threaded	70,000	—	1	000000000	0000




														1/4"-20

		1/4"						82°						Undercut	0.531"	0.107"	Fully Threaded	70,000	—	10	000000000	0000


		1/2"	100°					Undercut						0.531"	0.105"	Fully Threaded	70,000	—	1	000000000	0000
		5/8"	100°					Undercut						0.531"	0.105"	Fully Threaded	70,000	—	1	000000000	0000
		3/4"	100°					Undercut	0.531"					0.105"	Fully Threaded	70,000	—	1	000000000	0000
		1"	100°					Undercut	0.531"					0.105"	Fully Threaded	70,000	—	1	000000000	0000
		1 1/4"	100°					Undercut	0.531"					0.105"	Fully Threaded	70,000	—	1	000000000	0000
		1 1/2"	100°					Undercut	0.531"					0.105"	Fully Threaded	70,000	—	1	000000000	0000




								1/4"-28

								1/4"	82°					Undercut	0.531"	0.107"	Fully Threaded	70,000	ASME B18.3	10	000000000	0000




										5/16"-18

										3/4"	100°			Undercut	0.656"	0.127"	Fully Threaded	70,000	—	1	000000000	0000


										1"	100°			Undercut	0.656"	0.127"	Fully Threaded	70,000	—	1	000000000	0000
										1 1/4"	100°			Undercut	0.656"	0.127"	Fully Threaded	70,000	—	1	000000000	0000
										1 1/2"	100°			Undercut	0.656"	0.127"	Fully Threaded	70,000	—	1	000000000	0000




										3/8"-16

										1/2"	82°			Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	5	000000000	0000




														M3 × 0.5 mm

						5 mm	100°							Undercut	6 mm	1.3 mm	Fully Threaded	70,000	—	5	000000000	00000


						6 mm	100°							Undercut	6 mm	1.3 mm	Fully Threaded	70,000	—	5	000000000	00000
						8 mm	100°							Undercut	6 mm	1.3 mm	Fully Threaded	70,000	—	5	000000000	00000
						10 mm	100°							Undercut	6 mm	1.3 mm	Fully Threaded	70,000	—	5	000000000	00000
						12 mm	100°							Undercut	6 mm	1.3 mm	Fully Threaded	70,000	—	5	000000000	00000




												M4 × 0.7 mm

												6 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	—	1	000000000	0000


												8 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	—	1	000000000	0000
												10 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	—	1	000000000	0000
												12 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	—	1	000000000	0000
16 mm												100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	—	1	000000000	0000




												M5 × 0.8 mm

												8 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	—	1	000000000	0000


												10 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	—	1	000000000	0000
												12 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	—	1	000000000	0000
												16 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	—	1	000000000	0000
												20 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	—	1	000000000	0000




												M6 × 1 mm

												12 mm	100°	Undercut	12 mm	2.2 mm	Fully Threaded	70,000	—	1	000000000	0000


								16 mm	100°			Undercut	12 mm	2.2 mm	Fully Threaded	70,000	—	1	000000000	0000
								20 mm	100°			Undercut	12 mm	2.2 mm	Fully Threaded	70,000	—	1	000000000	0000
								25 mm	100°			Undercut	12 mm	2.2 mm	Fully Threaded	70,000	—	1	000000000	0000
								30 mm	100°			Undercut	12 mm	2.2 mm	Fully Threaded	70,000	—	1	000000000	0000




												M8 × 1.25 mm

												16 mm	100°	Undercut	16 mm	2.8 mm	Fully Threaded	70,000	—	1	000000000	0000


				20 mm	100°							Undercut	16 mm	2.8 mm	Fully Threaded	70,000	—	1	000000000	0000
				25 mm	100°							Undercut	16 mm	2.8 mm	Fully Threaded	70,000	—	1	000000000	0000
				30 mm	100°							Undercut	16 mm	2.8 mm	Fully Threaded	70,000	—	1	000000000	0000




										M10 × 1.5 mm

										16 mm	100°	Undercut	20 mm	3.5 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000


										25 mm	100°	Undercut	20 mm	3.5 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000
										30 mm	100°	Undercut	20 mm	3.5 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000
										35 mm	100°	Undercut	20 mm	3.5 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000
										50 mm	100°	Undercut	20 mm	3.5 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000




										M12 × 1.75 mm

										25 mm	100°	Undercut	24 mm	4.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000


										30 mm	100°	Undercut	24 mm	4.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000
										35 mm	100°	Undercut	24 mm	4.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	00000


										Highly-Corrosion-Resistant Black-Oxide 316 Stainless Steel







												M3 × 0.5 mm

												5 mm	100°	Undercut	6 mm	1.3 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000


												6 mm	100°	Undercut	6 mm	1.3 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
												8 mm	100°	Undercut	6 mm	1.3 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
		10 mm										100°	Undercut	6 mm	1.3 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
		12 mm	100°									Undercut	6 mm	1.3 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000




												M4 × 0.7 mm

												6 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000


												8 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
												10 mm	100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
								12 mm				100°	Undercut	8 mm	1.6 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
								16 mm	100°			Undercut	8 mm	1.6 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000




												M5 × 0.8 mm

												8 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000


												10 mm	100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
				12 mm								100°	Undercut	10 mm	1.9 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
				16 mm	100°							Undercut	10 mm	1.9 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000




												M6 × 1 mm

												12 mm	100°	Undercut	12 mm	2.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000


												16 mm	100°	Undercut	12 mm	2.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
												20 mm	100°	Undercut	12 mm	2.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
						30 mm						100°	Undercut	12 mm	2.2 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000




												M8 × 1.25 mm

												16 mm	100°	Undercut	16 mm	2.8 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000


												20 mm	100°	Undercut	16 mm	2.8 mm	Fully Threaded	70,000	ASTM A276	1	000000000	0000
												25 mm	100°	Undercut	16 mm	2.8 mm	Fully Threaded	70,000	ASTM A276	1	000000000	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.

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

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







				1-64

				1/8"	82°	Undercut	0.168"	0.031"	Fully Threaded	130,000	ASME B18.3, ASTM F835	10	000000000	000000




						3-48

						3/16"	82°	Undercut	0.187"	0.042"	Fully Threaded	130,000	ASTM F835	25	000000000	0000




								4-40

								1/8"	82°	Undercut	0.255"	0.047"	Fully Threaded	130,000	ASTM F835	25	000000000	00000




										5-40

										1/8"	82°	Undercut	0.281"	0.053"	Fully Threaded	130,000	ASTM F835	10	000000000	00000




												6-32

												1/8"	82°	Undercut	0.262"	0.059"	Fully Threaded	130,000	ASTM F835	10	000000000	00000


												5/32"	82°	Undercut	0.262"	0.059"	Fully Threaded	130,000	ASTM F835	5	000000000	0000
												3/16"	82°	Undercut	0.262"	0.059"	Fully Threaded	130,000	ASTM F835	25	000000000	00000




														8-32

														5/32"	82°	Undercut	0.312"	0.07"	Fully Threaded	130,000	ASTM F835	10	000000000	00000


														3/16"	82°	Undercut	0.359"	0.07"	Fully Threaded	130,000	ASTM F835	25	000000000	00000




																10-32

																3/16"	82°	Undercut	0.362"	0.081"	Fully Threaded	130,000	ASTM F835	5	000000000	00000




																		1/4"-20

1/4"	82°																	Undercut	0.531"	0.107"	Fully Threaded	130,000	ASTM F835	10	000000000	00000




		1/4"-28

		1/4"	82°															Undercut	0.477"	0.107"	Fully Threaded	130,000	ASTM F835	5	000000000	00000




				3/8"-16

				3/8"	82°													Undercut	0.717"	0.161"	Fully Threaded	130,000	ASTM F835	5	000000000	00000


				Zinc-Plated Alloy Steel







																		6-32

																		3/16"	82°	Undercut	0.307"	0.078"	Fully Threaded	130,000	ASTM F835	25	000000000	00000




																		8-32

																		1/4"	82°	Undercut	0.359"	0.099"	Fully Threaded	130,000	ASTM F835	100	000000000	00000

Tamper-Resistant Hex-Drive Stainless Steel Flat Head Screws

Image of Product. Front orientation. Contains Annotated, MultipleImages. Flat Head Screws. Tamper-Resistant Hex-Drive Stainless Steel Flat Head Screws.

Prevent unauthorized access and damage to components. These screws have a security pin in the drive that you can only turn with a tamper-resistant hex driver. Also known as pin-in-hex and pin-in-socket drives, the deep six-point opening helps them withstand torque without damaging the drive. 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.

L-Keys—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											L-Keys		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







				6-32

				1/4"	82°	Undercut	0.307"	0.059"	Fully Threaded	70,000	ASME B18.3	25	000000000	00000	0000000	00000	0000000	00000