5-40 Set Screws | McMaster-Carr

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62 Products

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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.

	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







	5-40

	3/32"	1/16"	Rockwell C45	25	91375A120	00000


	1/8"	1/16"	Rockwell C45	100	91375A121	00000
	3/16"	1/16"	Rockwell C45	100	91375A123	00000
	1/4"	1/16"	Rockwell C45	100	91375A124	00000
	5/16"	1/16"	Rockwell C45	100	91375A125	00000
	3/8"	1/16"	Rockwell C45	100	91375A126	00000
	7/16"	1/16"	Rockwell C45	10	91375A181	0000
	1/2"	1/16"	Rockwell C45	100	91375A128	00000
	5/8"	1/16"	Rockwell C45	50	91375A130	00000
	3/4"	1/16"	Rockwell C45	50	91375A131	00000
	7/8"	1/16"	Rockwell C45	25	91375A133	00000


	1"	1/16"	Rockwell C45	25	91375A134	00000

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.

	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	5-40

	1/8"	1/16"	Rockwell B80	100	92311A121	00000


	3/16"	1/16"	Rockwell B80	100	92311A123	0000
	1/4"	1/16"	Rockwell B80	100	92311A124	0000
	5/16"	1/16"	Rockwell B80	100	92311A325	0000
	3/8"	1/16"	Rockwell B80	100	92311A126	00000
	7/16"	1/16"	Rockwell B80	100	92311A282	00000
	1/2"	1/16"	Rockwell B80	100	92311A128	00000
	5/8"	1/16"	Rockwell B80	100	92311A326	00000
	3/4"	1/16"	Rockwell B80	50	92311A327	0000
	1"	1/16"	Rockwell B80	25	92311A328	0000

Steel Flat-Tip Set Screws

Spread out holding power and protect surfaces from damage. Unlike cup and cone tip screws, the flat tip on these distributes pressure evenly, reducing marring but not holding as tightly. They're a good choice for repositioning parts frequently on jigs, fixtures, and other applications where the tip presses against a flat surface. Made of alloy steel, these screws are 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.

	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







	5-40

	1/8"	1/16"	Rockwell C45	50	94105A120	00000


	3/16"	1/16"	Rockwell C45	50	94105A312	00000
	1/4"	1/16"	Rockwell C45	50	94105A313	00000
	5/16"	1/16"	Rockwell C45	50	94105A326	00000
	3/8"	1/16"	Rockwell C45	25	94105A327	0000
	1/2"	1/16"	Rockwell C45	10	94105A328	0000

Stainless Steel Flat-Tip Set Screws

These corrosion-resistant screws spread out holding power and protect surfaces from damage. Made of stainless steel, they won't rust, but they're not as strong as alloy steel. Unlike cup and cone tips, the flat tip distributes pressure evenly, reducing marring but not holding as tightly. They're a good choice for repositioning parts frequently on jigs, fixtures, and other applications where the tip presses against a flat surface.

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.

	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	5-40

	5/32"	1/16"	Rockwell B80	50	94355A218	000000

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	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







	5-40

	1/8"	90°	1/16"	Rockwell C45	25	92695A626	00000


	3/16"	90°	1/16"	Rockwell C45	50	92695A126	0000
	1/4"	90°	1/16"	Rockwell C45	50	92695A125	00000
	5/16"	90°	1/16"	Rockwell C45	25	92695A627	0000
	3/8"	90°	1/16"	Rockwell C45	10	92695A127	0000
	1/2"	90°	1/16"	Rockwell C45	10	92695A628	0000
	3/4"	90°	1/16"	Rockwell C45	5	92695A724	0000

Stainless Steel Extended-Tip Set Screws

Our most corrosion-resistant extended-tip set screws. Made of stainless steel, they won't rust, but they're not as strong as alloy steel. Like a dowel pin, the tip slides into mating holes to locate and hold components on shafts, tubing, and other surfaces. Also known as half dog-point set screws.

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.

		Tip
	Lg.	Dia.	Lg.	Drive Size	Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				5-40

				1/8"	0.083"	0.033"	1/16"	Rockwell B80	5	92845A717	000000


				3/16"	0.083"	0.033"	1/16"	Rockwell B80	5	92845A718	0000
				1/4"	0.083"	0.033"	1/16"	Rockwell B80	5	92845A719	0000
				5/16"	0.083"	0.033"	1/16"	Rockwell B80	5	92845A721	0000
				3/8"	0.083"	0.033"	1/16"	Rockwell B80	5	92845A722	0000
				1/2"	0.083"	0.033"	1/16"	Rockwell B80	5	92845A723	0000

Steel Extended-Tip Set Screws

Like a dowel pin, the tip slides into mating holes to locate and hold components on shafts, tubing, and other surfaces. Made of alloy steel, these screws are strong enough to hold components without wearing down. Also known as half dog-point 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.

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







				5-40

				1/8"	0.083"	0.033"	1/16"	Rockwell C45	25	92505A080	00000


				3/16"	0.083"	0.033"	1/16"	Rockwell C45	25	92505A083	0000
				1/4"	0.083"	0.033"	1/16"	Rockwell C45	25	92505A085	0000
				3/8"	0.083"	0.033"	1/16"	Rockwell C45	25	92505A090	0000

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



		5-40	0.02"	0.062"	0.3	0.8	18-8 Stainless Steel	0.25"	Spring Plunger Driver	Slotted	3408A89	00000


		5-40	0.02"	0.062"	0.3	0.8	Black-Oxide Steel	0.25"	Spring Plunger Driver	Slotted	3408A66	0000


		316 Stainless Steel Nose



				5-40	0.02"	0.062"	0.3	0.8	316 Stainless Steel	0.25"	Spring Plunger Driver	Slotted	8686A12	00000


				Brass Nose



						5-40	0.02"	0.062"	0.3	0.8	Brass	0.25"	Spring Plunger Driver	Slotted	8687A12	0000


						Nylon Nose



								5-40	0.02"	0.062"	0.3	0.8	18-8 Stainless Steel	0.25"	Spring Plunger Driver	Slotted	34085A36	0000


								5-40	0.02"	0.062"	0.3	0.8	Steel	0.25"	Spring Plunger Driver	Slotted	84805A52	0000

Stainless Steel Cone-Tip Set Screws

Our most corrosion-resistant cone-tip set screws. Made of stainless steel, they won't rust, but they're not as strong as alloy steel. The pointed tip bites down on surfaces but may scratch or gouge. They're a good choice to permanently secure parts that you don't intend to move.

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.

	Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	5-40

	1/4"	90°	1/16"	Rockwell B80	25	92785A123	00000


	3/8"	90°	1/16"	Rockwell B80	50	92785A509	00000
	1/2"	90°	1/16"	Rockwell B80	25	92785A510	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



	5-40	3/32"	1/16"	Rockwell C45	10	91301A006	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.

	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







	5-40

	1/8"	1/16"	Rockwell C45	100	90289A121	000000


	3/16"	1/16"	Rockwell C45	100	90289A123	00000
	1/4"	1/16"	Rockwell C45	100	90289A124	00000
	5/16"	1/16"	Rockwell C45	100	90289A125	00000

Thread-Locking Steel Cup-Tip Set Screws

These screws grip parts tightly and give you extra protection against mild vibration. They have a nylon-patch threadlocker bonded to the threads, saving you the time and mess of adding it yourself. 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.

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







				5-40

				3/16"	1/16"	Nylon Patch	-50° F to 250° F	Rockwell C45	10	91385A123	00000


				1/4"	1/16"	Nylon Patch	-50° F to 250° F	Rockwell C45	10	91385A124	0000