4-48 Set Screws | McMaster-Carr

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34 Products

Stainless Steel Cup-Tip Set Screws

These corrosion-resistant cup-tip screws grip parts tightly. Made of stainless steel, they won't rust, but they're not as strong as alloy steel. The tip has thin edges that dig into surfaces for a secure hold. They often lock gears, pulleys, and other transmission components onto shafts.

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.

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







	4-48

	1/16"	0.050"	Rockwell B80	ASME B18.3	25	92311A273	00000


	3/32"	0.050"	Rockwell B80	ASME B18.3	25	92311A274	0000
	1/8"	0.050"	Rockwell B80	ASME B18.3	25	92311A321	0000
	5/32"	0.050"	Rockwell B80	ASME B18.3	25	92311A275	0000
	3/16"	0.050"	Rockwell B80	ASME B18.3	25	92311A322	0000
	1/4"	0.050"	Rockwell B80	ASME B18.3	25	92311A323	0000
	5/16"	0.050"	Rockwell B80	ASME B18.3	25	92311A276	0000
	3/8"	0.050"	Rockwell B80	ASME B18.3	25	92311A277	0000
	7/16"	0.050"	Rockwell B80	ASME B18.3	25	92311A278	0000
	1/2"	0.050"	Rockwell B80	ASME B18.3	25	92311A324	0000
	5/8"	0.050"	Rockwell B80	ASME B18.3	10	92311A279	0000


	3/4"	0.050"	Rockwell B80	ASME B18.3	10	92311A280	0000
	1"	0.050"	Rockwell B80	ASME B18.3	10	92311A281	0000

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







	4-48

	3/32"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	10	91375A175	00000


	1/8"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	100	91375A114	00000
	3/16"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	100	91375A115	00000
	1/4"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	100	91375A116	00000
	5/16"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	25	91375A117	00000
	3/8"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	10	91375A180	0000
	1/2"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	25	91375A118	00000
	5/8"	0.050"	Rockwell C45	ASME B18.3, ASTM F912	25	91375A119	00000

Ball-Nose Spring Plungers

Align, position, and lock moving parts for most machining and assembly tasks. These spring plungers have a spring-loaded ball that compresses when a part presses against it, and then pops out into a notch or groove to hold the part in place. Unlike long-nose spring plungers, the ball rolls easily in and out of position, so they're a great fit for applications that require consistent, smooth movement, such as positioning parts in an assembly line and aligning fixtures and jigs when cutting or drilling.

Spring plungers are available with or without a threadlocker. Those with a threadlocker won't wiggle loose from vibration. Spring plungers without a threadlocker are easier to remove.

440C Stainless Steel Nose—The strongest, most wear-resistant stainless steel noses, these grind against hard metal surfaces without denting or scratching. However, they are not as corrosion resistant as 316 stainless steel.

316 Stainless Steel Nose—With the best corrosion resistance of all, 316 stainless steel stands up to harsh weather, salt water, and chemicals. The nose is strong enough for most jobs, but won't withstand stress and vibration as well as steel.

Brass Nose—Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments. Since brass is softer than other metals, these noses are less likely to dent surfaces, however, they could deform under high stress.

Nylon Nose—Extra soft to avoid scratching delicate surfaces. Nylon is best for use on soft materials, such as aluminum. It will swell and weaken when exposed to moisture, however, so it should only be used in dry environments.

		Nose		Nose Force, lbf		Body		Drive Style
	Thread Size	Extended Lg.	Dia.	Extended	Compressed	Material	Lg.	Front	Back		Each
440C Stainless Steel Nose



		4-48	0.02"	0.062"	0.1	0.5	18-8 Stainless Steel	0.19"	Spring Plunger Driver	Slotted	3408A88	00000


		4-48	0.02"	0.062"	0.1	0.5	Black-Oxide Steel	0.19"	Spring Plunger Driver	Slotted	3408A65	0000


		316 Stainless Steel Nose



				4-48	0.02"	0.062"	0.1	0.5	316 Stainless Steel	0.19"	Spring Plunger Driver	Slotted	8686A11	00000


				Brass Nose



						4-48	0.02"	0.062"	0.1	0.5	Brass	0.19"	Spring Plunger Driver	Slotted	8687A11	0000


						Nylon Nose



								4-48	0.02"	0.062"	0.1	0.5	18-8 Stainless Steel	0.19"	Spring Plunger Driver	Slotted	34085A35	0000


								4-48	0.02"	0.062"	0.1	0.5	Steel	0.19"	Spring Plunger Driver	Slotted	84805A51	0000

Steel Cone-Tip Set Screws

Permanently secure parts that you don't intend to move. The pointed tip bites down on surfaces but may scratch or gouge. Made of alloy steel, they're strong enough to hold components without wearing down.

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

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







	4-48

	1/8"	118°	0.050"	Rockwell C45	ASME B18.3, ASTM F912	25	92695A115	000000


	3/16"	90°	0.050"	Rockwell C45	ASME B18.3, ASTM F912	25	92695A120	00000
	1/4"	90°	0.050"	Rockwell C45	ASME B18.3, ASTM F912	10	92695A718	0000
	5/16"	90°	0.050"	Rockwell C45	ASME B18.3, ASTM F912	10	92695A719	0000
	3/8"	90°	0.050"	Rockwell C45	ASME B18.3, ASTM F912	10	92695A721	0000

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



	4-48	5/64"	0.050"	Rockwell C45	25	91301A100	000000

Serrated-Locking Steel Cup-Tip Set Screws

No wiggle, no wobble. Unlike standard cup tips, the knurled edges on these screws dig deeper into shafts and other materials. With a better grip, they're less likely to loosen when securing collars, gears, and pulleys that experience vibration. Made of alloy steel, they're strong enough to hold components without wearing down.

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







	4-48

	1/8"	0.050"	Rockwell C45	ASME B18.3	50	90289A130	000000