5-44 Set Screws | McMaster-Carr

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Unified Standard Class 3A

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UNF

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Black Oxide

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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6 Products

Tip Type

Cup

Thin edges dig into surfaces for a secure hold

5 products

Flat

Less likely than other tips to mar surfaces when you reposition parts frequently

1 product

Tip Type

Hollow

Thread over pins or other set screws to hold them in place

1 product

Performance

Nonmarring

Less likely than other tips to scratch, gouge, or deform surfaces

1 product

Steel Cup-Tip Set Screws

Made of alloy steel, these screws are strong enough to hold components without wearing down. The tip has thin edges that dig into surfaces for a secure hold. They often lock gears, pulleys, and other transmission components onto shafts.

Black-Oxide Alloy Steel—These screws have a dark matte finish that offers minimal corrosion resistance, so they're best for dry environments.

	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







	5-44

	1/8"	1/16"	Rockwell C45	ASME B18.3, ASTM F912	100	91375A221	000000


	3/16"	1/16"	Rockwell C45	ASME B18.3, ASTM F912	100	91375A223	00000
	1/4"	1/16"	Rockwell C45	ASME B18.3, ASTM F912	100	91375A224	00000
	5/16"	1/16"	Rockwell C45	ASME B18.3, ASTM F912	25	91375A225	00000
	3/8"	1/16"	Rockwell C45	ASME B18.3, ASTM F912	25	91375A227	00000

Steel Hollow-Tip Set Screws

Screw Used to Adjust

Spring Tension

Image of Product. Front orientation. Set Screws. Steel Hollow-Tip Set Screws.

Thread these screws over a pin or another set screw to lock it in place, or over a spring to adjust tension. You can also peek through the hollow center to inspect locked parts. Made of alloy steel, these screws are strong enough to hold components without wearing down. Also known as jam set screws.

Black-Oxide Alloy Steel—These screws have a dark matte finish that offers minimal corrosion resistance, so they're best for dry environments.

	Lg.	Drive Size	Hardness	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel



	5-44	3/32"	1/16"	Rockwell C45	10	91301A163	000000