Iron Thumb Screws | McMaster-Carr

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Finish

Thread Type

Stud Length

Thread Direction

Mount Type

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Unthreaded Through Hole

Thread Spacing

Coarse

Tip Type

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Export Control Classification Number (ECCN)

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DFARS Specialty Metals

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Tensile Strength

60,000 psi to 79,999 psi

Collar Height

Hardness

149 Products

Steel and Iron Wing Thumb Screws


2	3

The wing shape on these thumb screws offers more leverage than spade head thumb screws. Use these screws to fasten panels and covers that need frequent access. They are best for areas with occasional exposure to moisture.

Length is measured from under the head.

			Head
	Style	Lg.	Dia.	Wd.	Ht.	Threading	Tensile Strength	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Iron







				10-24

				2	1/2"	3/8"	1 1/16"	1/2"	Fully Threaded	Not Rated	—	1	000000000	00000


				2	3/4"	3/8"	1 1/16"	1/2"	Fully Threaded	Not Rated	—	1	000000000	0000
				2	1"	3/8"	1 1/16"	1/2"	Fully Threaded	Not Rated	—	1	000000000	0000
				2	1 1/2"	3/8"	1 1/16"	1/2"	Fully Threaded	Not Rated	—	1	000000000	0000




						1/4"-20

						2	1/2"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000


						2	3/4"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000
						2	1"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000
						2	1 1/2"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000
						2	2"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000
						2	2 1/2"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000
						2	3"	7/16"	1 3/8"	5/8"	Fully Threaded	Not Rated	—	1	000000000	0000




								5/16"-18

								3	3/4"	5/8"	1 3/4"	3/4"	Fully Threaded	Not Rated	—	1	000000000	0000


								3	1"	5/8"	1 3/4"	3/4"	Fully Threaded	Not Rated	—	1	000000000	0000
								3	1 1/2"	5/8"	1 3/4"	3/4"	Fully Threaded	Not Rated	—	1	000000000	0000
								3	2"	5/8"	1 3/4"	3/4"	Fully Threaded	Not Rated	—	1	000000000	0000
								3	2 1/2"	5/8"	1 3/4"	3/4"	Fully Threaded	Not Rated	—	1	000000000	0000
								3	3"	5/8"	1 3/4"	3/4"	Fully Threaded	Not Rated	—	1	000000000	0000




										3/8"-16

										3	3/4"	5/8"	1 13/16"	7/8"	Fully Threaded	Not Rated	—	1	000000000	0000


										3	1"	5/8"	1 13/16"	7/8"	Fully Threaded	Not Rated	—	1	000000000	0000
										3	1 1/2"	5/8"	1 13/16"	7/8"	Fully Threaded	Not Rated	—	1	000000000	0000
										3	2"	5/8"	1 13/16"	7/8"	Fully Threaded	Not Rated	—	1	000000000	0000
										3	3"	5/8"	1 13/16"	7/8"	Fully Threaded	Not Rated	—	1	000000000	0000




												1/2"-13

												3	1"	3/4"	2 1/4"	1"	Fully Threaded	Not Rated	—	1	000000000	0000


3	2"											3/4"	2 1/4"	1"	Fully Threaded	Not Rated	—	1	000000000	0000
3	2 1/2"											3/4"	2 1/4"	1"	Fully Threaded	Not Rated	—	1	000000000	0000
3	3"											3/4"	2 1/4"	1"	Fully Threaded	Not Rated	—	1	000000000	0000




		M4 × 0.7 mm

		3	8 mm									8 mm	20 mm	10.5 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000


		3	10 mm									8 mm	20 mm	10.5 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
		3	16 mm									8 mm	20 mm	10.5 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
		3	20 mm									8 mm	20 mm	10.5 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
		3	40 mm									8 mm	20 mm	10.5 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000




				M5 × 0.8 mm

				3	10 mm							11 mm	26 mm	13 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000


				3	12 mm							11 mm	26 mm	13 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
				3	16 mm							11 mm	26 mm	13 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
				3	20 mm							11 mm	26 mm	13 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
				3	25 mm							11 mm	26 mm	13 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
				3	40 mm							11 mm	26 mm	13 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000




						M6 × 1 mm

						3	10 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000


						3	12 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
						3	16 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
						3	20 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
						3	25 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
						3	30 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
						3	50 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
						3	60 mm					13 mm	33 mm	17 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000




								M8 × 1.25 mm

								3	12 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000


								3	16 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
								3	20 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
								3	25 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
								3	30 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
								3	40 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
								3	50 mm			16 mm	39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000
								3	80 mm	16 mm		39 mm	20 mm	Fully Threaded	Not Rated	DIN 316	1	000000000	0000

Steel Four-Arm Extended-Tip Thumb Screws

Four arms and an extended tip help you guide these screws into holes with greater control. The arms of the head have more surface area to grip than knurled-head thumb screws. The extended tip acts like a dowel—it fits into mating holes, aligns and holds parts together, and prevents cross-threading. Use these screws for workpieces that you regularly reposition or align. Also known as dog-point and pilot-point thumb screws.

Length is measured from under the collar.

Black-Oxide 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			Collar, mm		Tip, mm
	Lg., mm	Wd., mm	Ht., mm	Material	Dia.	Ht.	Dia.	Lg.	Threading	Tensile Strength, psi		Each
Black-Oxide Steel







				M6 × 1 mm

				26	38	22	Zinc-Plated Cast Iron	16	12.5	4.5	3	Fully Threaded	70,000	000000000	000000


				38	38	22	Zinc-Plated Cast Iron	16	12.5	4.5	3	Fully Threaded	70,000	000000000	00000




						M8 × 1.25 mm

						44.5	38	22	Zinc-Plated Cast Iron	16	12.5	6	4.5	Fully Threaded	70,000	000000000	00000




								M10 × 1.5 mm

								38	51	22	Zinc-Plated Cast Iron	19	16	7	4.5	Fully Threaded	70,000	000000000	00000


								51	51	22	Zinc-Plated Cast Iron	19	16	7	4.5	Fully Threaded	70,000	000000000	00000




										M12 × 1.75 mm

										38	63.5	38	Zinc-Plated Cast Iron	28.5	25.5	10	6.5	Fully Threaded	70,000	000000000	00000


										63.5	63.5	38	Zinc-Plated Cast Iron	28.5	25.5	10	6.5	Fully Threaded	70,000	000000000	00000

Steel and Iron Spade-Head Thumb Screws

Our most popular spade-head thumb screws. The head is slim and flat like a coin for extra leverage when twisting.

Length is measured from under the head.

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

		Head, mm
	Lg., mm	Wd.	Ht.	Threading	Tensile Strength	Pkg. Qty.		Pkg.
Zinc-Plated Iron







				M5 × 0.8 mm

				10	20.5	15.5	Fully Threaded	Not Rated	5	000000000	000000


				16	20.5	15.5	Fully Threaded	Not Rated	5	000000000	00000
				20	20.5	15.5	Fully Threaded	Not Rated	5	000000000	00000




						M6 × 1 mm

						10	23.5	16	Fully Threaded	Not Rated	1	000000000	0000


						16	23.5	16	Fully Threaded	Not Rated	5	000000000	00000
						20	23.5	16	Fully Threaded	Not Rated	5	000000000	00000
						30	23.5	16	Fully Threaded	Not Rated	1	000000000	0000




								M8 × 1.25 mm

								16	27.5	19	Fully Threaded	Not Rated	1	000000000	0000


								20	27.5	19	Fully Threaded	Not Rated	1	000000000	0000

Threaded-Stud Knobs


Style 1	Style 14

Mount these knobs into a threaded hole. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 1—Knurled-Head Grip

Style 1

Zinc-Plated Iron—Zinc-plated iron knobs have mild rust resistance.

			Head		Hub				Each
	Thread Size	Stud Lg.	Dia.	Ht.	Dia.	Ht.	Stud Material		1-9	10-99	100-Up
Zinc-Plated Iron



		1/4"-20	1 3/4"	1 1/2"	3/8"	5/8"	1/2"	Steel	0000000	000000	00000	00000


		1/4"-20	3"	1 1/2"	3/8"	5/8"	1/2"	Steel	0000000	00000	00000	0000
		5/16"-18	1 3/4"	2"	3/8"	3/4"	1/2"	Steel	0000000	00000	00000	0000
		5/16"-18	3"	2"	3/8"	3/4"	1/2"	Steel	0000000	00000	00000	0000
		3/8"-16	1 3/4"	2"	3/8"	3/4"	1/2"	Steel	0000000	00000	00000	0000
		3/8"-16	3"	2"	3/8"	3/4"	1/2"	Steel	000000	00000	00000	00000
		1/2"-13	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000	00000
		1/2"-13	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000	00000
		5/8"-11	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000	00000
		5/8"-11	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000	00000

Style 14—Four-Arm Grip

Style 14

			Head		Hub				Each
	Thread Size	Stud Lg.	Dia.	Ht.	Dia.	Ht.	Stud Material		1-9	10-99	100-Up
Iron



		1/4"-20	1 3/4"	1 1/2"	3/8"	5/8"	1/2"	Steel	00000000	00000	00000	00000


		1/4"-20	3"	1 1/2"	3/8"	5/8"	1/2"	Steel	00000000	00000	00000	0000
		5/16"-18	1 3/4"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	0000	0000
		5/16"-18	3"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	00000	0000
		3/8"-16	1 3/4"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	0000	0000
		3/8"-16	3"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	00000	0000
		1/2"-13	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000	00000
		1/2"-13	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000	00000
		5/8"-11	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000	00000
		5/8"-11	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000	00000

Threaded Through-Hole Knobs


Style 7	Style 8	Style 9	Style 10	Style 11	Style 12

Long shafts can thread through these knobs for mounting versatility. The knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 7—Four-Arm Grip

Style 7

	Thread		Head		Hub			Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		1/4"-20	11/16"	1 1/8"	5/16"	9/16"	3/8"	0000000	000000	00000


		5/16"-18	1"	1 1/2"	7/16"	5/8"	9/16"	0000000	00000	0000
		3/8"-16	1"	2"	7/16"	3/4"	9/16"	0000000	00000	00000
		1/2"-13	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	0000000	00000	00000
		5/8"-11	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	0000000	00000	00000

Style 8—Four-Arm Grip

Style 8

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Set Screw Thread Size	Set Screw Included		1-9	10-Up
Iron



		3/8"-16	1"	2"	7/16"	3/4"	9/16"	1/4"-20	Yes	0000000	000000	000000


		1/2"-13	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	1/4"-20	Yes	0000000	00000	00000
		5/8"-11	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	1/4"-20	Yes	0000000	00000	00000

Style 9—Five-Arm Grip

Style 9

	Thread		Head		Hub			Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		5/8"-11	1 3/4"	3"	1/2"	1 1/4"	1 1/4"	0000000	000000	000000


		3/4"-10	1 3/4"	3 1/4"	1/2"	1 1/2"	1 1/4"	0000000	00000	00000

Style 10—Five-Arm Grip

Style 10

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Set Screw Thread Size	Set Screw Included		1-9	10-Up
Iron



		5/8"-11	1 3/4"	3"	1/2"	1 1/4"	1 1/4"	1/4"-20	Yes	0000000	000000	000000


		3/4"-10	1 3/4"	3 1/4"	1/2"	1 1/2"	1 1/4"	1/4"-20	Yes	0000000	00000	00000

Style 11—Six-Arm Grip

Style 11

	Thread		Head		Hub			Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		3/8"-16	1"	2"	1/2"	7/8"	1/2"	00000000	000000	000000


		3/8"-16	2"	1 1/2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		3/8"-16	2"	2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		1/2"-13	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	0000000	00000	00000
		1/2"-13	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	0000000	00000	00000
		3/4"-10	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	0000000	00000	00000

Style 12—Six-Arm Grip

Style 12

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Set Screw Thread Size	Set Screw Included		1-9	10-Up
Iron



		3/8"-16	2"	2"	1/2"	7/8"	1 1/2"	1/4"-20	Yes	0000000	000000	000000


		1/2"-13	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	1/4"-20	Yes	0000000	00000	00000
		1/2"-13	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	1/4"-20	Yes	0000000	00000	00000
		3/4"-10	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	1/4"-20	Yes	0000000	00000	00000

Wing Nuts


Style 4	Style 5	Style 8

The easiest nuts to twist on and off by hand, these are commonly used to fasten parts that need to be frequently disassembled, such as access panels and covers. The wings give you more leverage than knurled-head nuts, so you can apply greater torque and achieve a tighter fit.

Iron

Style 4

Style 5

Style 8

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

Iron—Best for dry environments since moisture will cause these nuts to rust.

							Pkg.
	Thread Size	Wd.	Ht.	Base Dia.	Pkg. Qty.		1-9	10-49	50-Up
Zinc-Plated Iron







				Style 5

				3/8"-16	1 5/8"	7/8"	5/8"	5	000000000	000000	000000	000000


				M5 × 0.8 mm	28.6 mm	12.7 mm	9.53 mm	5	000000000	00000	00000	00000
				M10 × 1.5 mm	41.3 mm	20.6 mm	16 mm	1	000000000	0000	0000	0000


				Iron







								Style 4

								1/4"-20	1 1/8"	5/8"	7/16"	5	000000000	00000	00000	00000




										Style 8

										1/4"-20	3"	3/4"	1"	1	000000000	0000	0000	0000


										5/16"-18	3"	3/4"	1"	1	000000000	0000	0000	0000

Unthreaded Through-Hole Knobs


Style 4	Style 7

Create custom threads or secure with a set screw to provide a firm grip to position, tighten, and hold fixtures, equipment, and machinery. Long shafts can pass through these knobs for mounting versatility.

Style 4—Four-Arm Grip

Style 4

	Hole		Head		Hub			Each
	Dia.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		1/4"	11/16"	1 1/8"	5/16"	9/16"	3/8"	0000000	000000	00000


		5/16"	1"	1 1/2"	7/16"	5/8"	9/16"	0000000	00000	0000
		3/8"	1"	2"	7/16"	3/4"	9/16"	0000000	00000	00000
		1/2"	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	0000000	00000	00000
		5/8"	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	0000000	00000	00000

Style 7—Six-Arm Grip

Style 7

	Hole		Head		Hub			Each
	Dia.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		3/8"	1"	2"	1/2"	7/8"	1/2"	00000000	000000	000000


		3/8"	2"	1 1/2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		3/8"	2"	2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		1/2"	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	0000000	00000	00000
		1/2"	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	0000000	00000	00000
		3/4"	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	0000000	00000	00000

Threaded Through-Hole Bar Knobs

Install these knobs on a threaded stud. Insert a bar between the arms and twist. The bar provides maximum leverage to tighten knobs securely. Made of iron, these knobs have a zinc-plated finish for corrosion resistance.

Four-Arm Grip

	Thread			Head		Hub			Each
	Sz.	Dp.	For Max. Bar Dia.	Wd.	Ht.	Dia.	Ht.		1-9	10-Up
Zinc-Plated Iron



		3/8"-16	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	0000000	000000	000000


		1/2"-13	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	0000000	00000	00000
		1/2"-13	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	0000000	00000	00000
		5/8"-11	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	0000000	00000	00000
		5/8"-11	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	0000000	00000	00000
		3/4"-10	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	0000000	00000	00000

Machinable-Hub Knobs


Style 4	Style 6	Style 7

Mill specific holes or keyways in the hub to meet your specifications, or weld in place. These knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 4—Four-Arm Grip

Style 4

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		1 1/8"	5/16"	9/16"	3/8"	0000000	00000	00000


		1 1/2"	7/16"	5/8"	9/16"	0000000	0000	0000
		2"	7/16"	3/4"	9/16"	0000000	0000	0000
		2 1/2"	1/2"	1"	1 3/4"	0000000	00000	00000
		2 9/16"	1/2"	1 1/8"	1"	0000000	0000	0000

Style 6—Five-Arm Grip

Style 6

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		3"	1/2"	1 1/4"	1 1/4"	0000000	000000	000000


		3 1/4"	1/2"	1 1/2"	1 1/4"	0000000	00000	00000

Style 7—Six-Arm Grip

Style 7

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		1 1/2"	1/2"	7/8"	1 1/2"	0000000	00000	00000


		2"	1/2"	7/8"	1/2"	0000000	0000	0000
		2"	1/2"	7/8"	1 1/2"	0000000	00000	0000
		2 3/4"	1/2"	1 1/4"	3/4"	0000000	00000	00000
		2 3/4"	1/2"	1 1/4"	1 1/2"	0000000	00000	00000
		3 1/2"	5/8"	1 5/8"	7/8"	0000000	00000	00000

Machinable-Hub Bar Knobs

Mill specific holes or keyways in the hub to meet your specifications, or weld in place. Insert a bar between the arms and twist. The bar provides maximum leverage to tighten knobs securely. Made of iron, these knobs have a zinc-plated finish for corrosion resistance.

Four-Arm Grip

		Head		Hub			Each
	For Max. Bar Dia.	Wd.	Ht.	Dia.	Ht.		1-9	10-Up
Zinc-Plated Iron



		7/16"	2"	1 1/4"	1 1/4"	7/8"	000000	000000	000000


		11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	000000	00000	00000