ASME B18.13.1M Rounded Head Screws

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DFARS Specialty Metals

98 Products

Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

These corrosion-resistant screws have sharp external teeth that hold better than screws with internal teeth when vibration resistance matters. They’re less likely to come loose during vibration, but the teeth may snag on surrounding objects. Also known as Sems screws, the washer rotates freely but is permanently attached. 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, mm		Washer, mm
	Lg., mm	Dia.	Ht.	OD	Thk.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M2.5 × 0.45 mm

				4	5	2	5.5	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A400	000000


				5	5	2	5.5	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A402	00000
				6	5	2	5.5	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A404	00000
				8	5	2	5.5	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A406	00000
				10	5	2	5.5	0.45	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	25	90317A408	00000
				12	5	2	5.5	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A410	0000




						M3 × 0.5 mm

						4	5.6	2.4	5.84	0.45	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	25	90317A550	00000


						5	5.6	2.4	6.50	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A870	00000
						6	5.6	2.4	5.69	0.45	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	25	90317A523	0000
						8	5.6	2.4	5.69	0.45	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	25	90317A526	0000
						10	5.6	2.4	5.49	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A529	0000
						12	5.6	2.4	5.69	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A532	0000
						16	5.6	2.4	6.50	0.45	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	10	90317A880	0000
						20	5.6	2.4	5.85	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A711	00000




								M4 × 0.7 mm

								8	8	3.1	7.87	0.6	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	10	90317A573	0000


								10	8	3.1	7.82	0.6	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A575	0000
								12	8	3.1	7.82	0.6	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A579	0000
								20	8	3.1	8.05	0.6	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A585	0000
								25	8	3.1	8.05	0.6	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A590	0000




										M5 × 0.8 mm

										8	10	3.8	10	0.65	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A598	0000


										10	10	3.8	10	0.65	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A890	00000
										12	10	3.8	10	0.65	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A602	0000
										14	10	3.8	10	0.65	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A605	0000
										16	10	3.8	10	0.65	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A607	0000
										20	9.5	3.7	10.5	0.58	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A712	0000




M6 × 1 mm

10	12											4.6	12.1	0.75	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A713	0000


12	12											4.6	11	0.75	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A891	00000
16	12	4.6										12.1	0.75	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A714	0000
20	12	4.6	12.1									0.75	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	10	90317A715	0000
25	12	4.6	12.1									0.75	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A716	0000

Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

These corrosion-resistant screws have a washer with sharp internal teeth to keep screws in place during vibration. Unlike external-tooth lock washers, their smooth outside edge provides a finished look and won’t snag on surrounding objects. Also known as Sems screws, the washer rotates freely but is permanently attached. These screws 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, mm		Washer, mm
	Lg., mm	Dia.	Ht.	OD	Thk.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M2.5 × 0.45 mm

				4	5	2	5.59	0.38	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	25	90317A100	000000


				5	5	2	5.59	0.38	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A103	00000
				6	5	2	5.59	0.38	Fully Threaded	70,000	ASME B18.13.1M	Material Certificate	25	90317A106	00000
				8	5	2	5.7	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A810	00000
				10	5	2	5.7	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A820	00000
				12	5	2	5.59	0.38	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A109	0000




						M3 × 0.5 mm

						4	5.6	2.4	6.68	0.43	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A110	00000


						5	5.6	2.4	6.50	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	25	90317A830	00000
						16	5.6	2.4	6.50	0.45	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A840	0000




								M4 × 0.7 mm

								16	8	3.1	8.5	0.6	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A850	0000


								20	8	3.1	8.46	0.51	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A176	00000
								25	8	3.1	8.46	0.51	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A179	00000
								30	8	3.1	8.43	0.51	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A717	0000




										M5 × 0.8 mm

										8	10	3.8	9.6	0.56	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A198	0000


										10	9	3.45	10	0.6	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A860	00000
										14	10	3.8	9.6	0.56	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A208	00000
										16	10	3.8	9.6	0.56	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A211	00000
										20	9.5	3.7	9.6	0.56	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A718	0000




												M6 × 1 mm

												10	12	4.6	11.99	0.64	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A719	0000


												12	12	4.6	11.74	0.64	Fully Threaded	70,000	ASME B18.13.1M	—	5	90317A230	00000
												16	12	4.6	11.99	0.64	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A720	0000
20												12	4.6	11.99	0.64	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A721	0000
25	12											4.6	11.99	0.64	Fully Threaded	70,000	ASME B18.13.1M	—	10	90317A722	0000

Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Sharp internal teeth hold screws in place despite frequent movement and vibration. These screws have a washer with teeth that dig into surfaces to prevent loosening. Unlike external-tooth lock washers, their smooth outside edge provides a finished look and won't snag on surrounding objects. Also known as Sems screws, the washer rotates freely but is permanently attached. These screws 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.

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

		Head, mm		Washer, mm
	Lg., mm	Dia.	Ht.	OD	Thk.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				M2 × 0.4 mm

				4	4	1.6	4.7	0.33	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A856	000000


				5	4	1.6	4.7	0.33	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A857	00000
				6	4	1.6	4.7	0.33	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A858	00000
				8	4	1.6	4.7	0.33	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A859	00000
				10	4	1.6	4.7	0.33	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A860	00000




						M4 × 0.7 mm

						6	8	3.1	8.58	0.51	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A861	00000


						8	8	3.1	8.58	0.51	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90403A862	00000
						10	8	3.1	8.58	0.51	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A863	00000
						12	8	3.1	8.58	0.51	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A864	00000
						16	8	3.1	8.58	0.51	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A865	00000




								M5 × 0.8 mm

								8	9.5	3.7	9.73	0.56	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A866	00000


								10	9.5	3.7	9.73	0.56	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A867	00000
								12	9.5	3.7	9.73	0.56	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A868	00000
								16	9.5	3.7	9.73	0.56	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A869	00000
								20	9.5	3.7	9.73	0.56	Fully Threaded	60,000	ASME B18.13.1M	—	25	90403A870	00000




										M6 × 1 mm

										10	12	4.6	12.14	0.64	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A871	0000


										12	12	4.6	12.14	0.64	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A872	0000
										16	12	4.6	12.14	0.64	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A873	0000
										20	12	4.6	12.14	0.64	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A874	0000
										25	12	4.6	12.14	0.64	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A875	0000




												M8 × 1.25 mm

												12	16	6	15.5	0.85	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A876	0000


16												16	6	15.5	0.85	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A877	0000
20	16											6	15.5	0.85	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A878	0000
25	16											6	15.5	0.85	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	10	90403A879	0000
30	16											6	15.5	0.85	Fully Threaded	60,000	ASME B18.13.1M	—	10	90403A880	0000

Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Sharp external teeth provide a stronger grip than internal-tooth lock washers during frequent vibration. These screws are less likely to come loose, but the teeth may snag on surrounding objects. Also known as Sems screws, the washer rotates freely but is permanently attached. These screws 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.

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

		Head, mm		Washer, mm
	Lg., mm	Dia.	Ht.	OD	Thk.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				M3 × 0.5 mm

				5	5.6	2.4	5.84	0.45	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A701	000000


				6	5.6	2.4	5.84	0.45	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A702	00000
				8	5.6	2.4	5.84	0.45	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A703	00000
				10	5.6	2.4	5.84	0.45	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A704	00000
				12	5.6	2.4	5.84	0.45	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A705	00000




						M4 × 0.7 mm

						6	8	3.1	8.25	0.6	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A706	00000


						8	8	3.1	8.25	0.6	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A707	00000
						10	8	3.1	8.25	0.6	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A708	00000
						12	8	3.1	8.25	0.6	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A709	00000
						16	8	3.1	8.25	0.6	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A710	00000




								M5 × 0.8 mm

								8	9.5	3.7	10.5	0.65	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A711	00000


								10	9.5	3.7	10.5	0.65	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A712	00000
								12	9.5	3.7	10.5	0.65	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A713	00000
								16	9.5	3.7	10.5	0.65	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A714	00000
								20	9.5	3.7	10.5	0.65	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A715	00000




										M6 × 1 mm

										10	12	4.6	12.1	0.75	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A716	00000


										12	12	4.6	12.1	0.75	Fully Threaded	60,000	ASME B18.13.1M	Material Certificate	25	90402A717	00000
										16	12	4.6	12.1	0.75	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A718	00000
										20	12	4.6	12.1	0.75	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A719	00000
										25	12	4.6	12.1	0.75	Fully Threaded	60,000	ASME B18.13.1M	—	25	90402A720	00000