Type S Thumb Screws | McMaster-Carr

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20,000 psi to 59,999 psi

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97 Products

Stainless Steel Flanged Spade-Head Thumb Screws

These corrosion-resistant thumb screws have a built-in flange that distributes pressure in thin and soft materials—no washer needed. It also provides extra surface area under the screw head to hold down material. The head of these thumb screws is slim and flat like a coin for extra leverage when twisting.

Length is measured from under the flange.

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

		Head
	Lg.	Wd.	Ht.	Flange Dia.	Threading	Tensile Strength	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				6-32

				3/8"	5/16"	11/32"	0.245"	Fully Threaded	Not Rated	10	91744A110	000000


				1/2"	5/16"	11/32"	0.245"	Fully Threaded	Not Rated	10	91744A120	00000




						8-32

						3/8"	23/64"	25/64"	0.281"	Fully Threaded	Not Rated	10	91744A192	00000


						1/2"	23/64"	25/64"	0.281"	Fully Threaded	Not Rated	10	91744A194	00000
						3/4"	23/64"	25/64"	0.281"	Fully Threaded	Not Rated	5	91744A197	0000
						1"	23/64"	25/64"	0.281"	Fully Threaded	Not Rated	5	91744A199	00000




								10-24

								3/8"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	10	91744A240	00000


								1/2"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A242	00000
								3/4"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A245	00000
								1"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A247	00000
								1 1/2"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A130	00000




										10-32

										3/8"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	10	91744A827	00000


										1/2"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A829	00000
										3/4"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A831	00000
										1"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A833	00000
										1 1/2"	7/16"	15/32"	0.343"	Fully Threaded	Not Rated	5	91744A140	00000




												1/4"-20

												1/2"	33/64"	19/32"	0.435"	Fully Threaded	Not Rated	5	91744A537	00000


												5/8"	33/64"	19/32"	0.435"	Fully Threaded	Not Rated	5	91744A538	00000
												3/4"	33/64"	19/32"	0.435"	Fully Threaded	Not Rated	5	91744A540	00000
												1"	33/64"	19/32"	0.435"	Fully Threaded	Not Rated	5	91744A542	00000
												1 1/4"	33/64"	19/32"	0.435"	Fully Threaded	Not Rated	5	91744A545	00000
1 1/2"												33/64"	19/32"	0.435"	Fully Threaded	Not Rated	5	91744A548	00000
2"	33/64"											19/32"	0.435"	Fully Threaded	Not Rated	1	91744A150	0000
2 1/2"	33/64"											19/32"	0.435"	Fully Threaded	Not Rated	1	91744A160	0000




		5/16"-18

		3/4"	11/16"									3/4"	0.563"	Fully Threaded	Not Rated	1	91744A581	0000


		1"	11/16"									3/4"	0.563"	Fully Threaded	Not Rated	1	91744A583	0000
		1 1/2"	11/16"									3/4"	0.563"	Fully Threaded	Not Rated	1	91744A587	0000




				3/8"-16

				1"	13/16"							15/16"	0.69"	Fully Threaded	Not Rated	1	91744A624	0000


				1 1/2"	13/16"							15/16"	0.69"	Fully Threaded	Not Rated	1	91744A628	0000
				2"	13/16"							15/16"	0.69"	Fully Threaded	Not Rated	1	91744A170	0000

Steel Flanged Spade-Head Thumb Screws

A built-in flange distributes pressure in thin and soft materials—no washer needed. It also provides extra surface area under the head to hold down material. The head of these thumb screws is slim and flat like a coin for extra leverage when twisting.

Length is measured from under the flange.

Steel—An economical choice that's strong, but rusts in moisture. They're best for dry environments.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

		Head
	Lg.	Wd.	Ht.	Flange Dia.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
Steel







				6-32

				1/4"	5/16"	11/32"	0.250"	Fully Threaded	40,000	25	90179A144	000000


				3/8"	5/16"	11/32"	0.250"	Fully Threaded	40,000	25	90179A146	00000
				1/2"	5/16"	11/32"	0.250"	Fully Threaded	40,000	25	90179A148	00000
				3/4"	5/16"	11/32"	0.250"	Fully Threaded	40,000	25	90179A151	00000
				1"	5/16"	11/32"	0.250"	Fully Threaded	40,000	25	90179A153	00000




						8-32

						3/8"	23/64"	25/64"	0.281"	Fully Threaded	40,000	25	90179A192	0000


						1/2"	23/64"	25/64"	0.281"	Fully Threaded	40,000	25	90179A194	0000




								10-24

								3/8"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A240	00000


								1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A242	00000
								3/4"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A245	00000
								1"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A247	00000
								1 1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A251	00000
								2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A253	00000




										10-32

										3/8"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A827	00000


										1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A829	00000
										3/4"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A831	00000
										1"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A833	00000
										1 1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A836	00000
										2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	90179A838	00000




												1/4"-20

												1/2"	33/64"	19/32"	0.438"	Fully Threaded	40,000	25	90179A537	00000


												3/4"	33/64"	19/32"	0.438"	Fully Threaded	40,000	25	90179A540	00000
1"												33/64"	19/32"	0.438"	Fully Threaded	40,000	25	90179A542	00000
1 1/4"	33/64"											19/32"	0.438"	Fully Threaded	40,000	25	90179A544	00000
1 1/2"	33/64"											19/32"	0.438"	Fully Threaded	40,000	25	90179A546	00000
2"	33/64"											19/32"	0.438"	Fully Threaded	40,000	25	90179A550	00000
2 1/2"	33/64"											19/32"	0.438"	Fully Threaded	40,000	10	90179A552	0000




		5/16"-18

		1/2"	11/16"									3/4"	0.563"	Fully Threaded	40,000	25	90179A578	00000


		3/4"	11/16"									3/4"	0.563"	Fully Threaded	40,000	10	90179A581	00000
		1"	11/16"									3/4"	0.563"	Fully Threaded	40,000	10	90179A583	0000
		1 1/2"	11/16"									3/4"	0.563"	Fully Threaded	40,000	10	90179A587	0000
		2"	11/16"									3/4"	0.563"	Fully Threaded	40,000	10	90179A591	0000
		2 1/2"	11/16"									3/4"	0.563"	Fully Threaded	40,000	10	90179A593	00000




				3/8"-16

				3/4"	13/16"							15/16"	0.688"	Fully Threaded	40,000	10	90179A622	00000


				1"	13/16"							15/16"	0.688"	Fully Threaded	40,000	10	90179A624	00000
				1 1/4"	13/16"							15/16"	0.688"	Fully Threaded	40,000	10	90179A626	00000
				1 1/2"	13/16"	15/16"						0.688"	Fully Threaded	40,000	10	90179A628	00000
				2"	13/16"	15/16"	0.688"					Fully Threaded	40,000	10	90179A632	00000
				2 1/2"	13/16"	15/16"	0.688"					Fully Threaded	40,000	10	90179A634	00000
				3"	13/16"	15/16"	0.688"					Fully Threaded	40,000	10	90179A636	00000


				Zinc-Plated Steel







												6-32

								1/4"	5/16"			11/32"	0.250"	Fully Threaded	40,000	10	97008A110	00000


								3/8"	5/16"			11/32"	0.250"	Fully Threaded	40,000	10	97008A113	0000




												8-32

												3/8"	23/64"	25/64"	0.281"	Fully Threaded	40,000	25	97008A140	0000


										1/2"		23/64"	25/64"	0.281"	Fully Threaded	40,000	25	97008A143	0000




												10-24

												1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A210	0000


												3/4"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A213	0000
												1"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A216	0000




												10-32

												3/8"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A250	0000


												1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A253	0000
												3/4"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A256	0000
												1"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A259	0000
												1 1/2"	7/16"	15/32"	0.344"	Fully Threaded	40,000	25	97008A262	00000




												1/4"-20

												1/2"	33/64"	19/32"	0.438"	Fully Threaded	40,000	25	97008A612	00000


												3/4"	33/64"	19/32"	0.438"	Fully Threaded	40,000	25	97008A614	00000
												1"	33/64"	19/32"	0.438"	Fully Threaded	40,000	25	97008A616	00000
												1 1/4"	33/64"	19/32"	0.438"	Fully Threaded	40,000	10	97008A618	0000
												1 1/2"	33/64"	19/32"	0.438"	Fully Threaded	40,000	10	97008A620	0000
												2"	33/64"	19/32"	0.438"	Fully Threaded	40,000	10	97008A622	0000
												2 1/2"	33/64"	19/32"	0.438"	Fully Threaded	40,000	10	97008A625	0000




												5/16"-18

												1/2"	11/16"	3/4"	0.563"	Fully Threaded	40,000	10	97008A722	0000


						3/4"	11/16"					3/4"	0.563"	Fully Threaded	40,000	10	97008A724	0000
						1"	11/16"					3/4"	0.563"	Fully Threaded	40,000	10	97008A726	0000
						1 1/2"	11/16"					3/4"	0.563"	Fully Threaded	40,000	10	97008A728	0000
						2"	11/16"					3/4"	0.563"	Fully Threaded	40,000	10	97008A730	0000




								3/8"-16

								3/4"	13/16"			15/16"	0.688"	Fully Threaded	40,000	10	97008A812	0000


								1"	13/16"			15/16"	0.688"	Fully Threaded	40,000	10	97008A816	0000
								1 1/2"	13/16"			15/16"	0.688"	Fully Threaded	40,000	10	97008A820	00000
								2"	13/16"			15/16"	0.688"	Fully Threaded	40,000	10	97008A825	00000