Plastic Screw Covers | McMaster-Carr

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112 Products

Hinged Caps for Screws

Flip open for frequent access to screws without misplacing the cap. These conceal screw heads to keep out dirt and prevent snags. To install, insert a screw through the base and close the top.

Polypropylene—Strong, durable, and won't absorb moisture.

	Inside Ht.	OD	Flexibility	Max. Temp., ° F	Choose a Color	Pkg. Qty.		Pkg.
Polypropylene



	No. 4, No. 5, No. 6	3/32"	15/32"	Rigid	250	Black , White	100	000000000	00000


	No. 6, No. 8, No. 10, M3, M4, M5	9/64"	9/16"	Rigid	135	Beige , Dark Blue , Dark Brown , Dark Green , Dark Red , Light Brown , Light Gray , Off-White , Silver	100	000000000	00000
	No. 8, No. 10	7/64"	35/64"	Rigid	250	Black , White	100	000000000	00000
	1/4"	5/32"	45/64"	Rigid	250	Black , White	100	000000000	00000
	3/8"	19/64"	61/64"	Rigid	250	Black , White	100	000000000	00000

Snap-On Caps for Screws

Conceal screw heads for a finished look that protects people and parts from getting snagged. To install, insert your screw through the base and snap the cap over it. When it's time to remove, use a tool such as a screwdriver to pop it off.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	Inside Ht.	OD	Flexibility	Max. Temp.	Choose a Color	Pkg. Qty.		Pkg.
Polyethylene



	No. 4	1/8"	1/2"	Rigid	Not Rated	Black , White	25	000000000	000000


	No. 6	1/8"	1/2"	Rigid	Not Rated	Black , White	25	000000000	00000
	No. 6, No. 8	13/64"	33/64"	Rigid	Not Rated	Silver	25	000000000	00000
	No. 8	7/32"	1/2"	Rigid	Not Rated	Black , White	25	000000000	00000
	No. 10	11/64"	23/32"	Rigid	Not Rated	Black	25	000000000	0000
	No. 12	11/64"	23/32"	Rigid	Not Rated	Black	25	000000000	0000
	1/4"	5/16"	1 3/16"	Rigid	Not Rated	Black , White	25	000000000	00000
	5/16"	5/16"	1 3/16"	Rigid	Not Rated	Black , White	25	000000000	00000
	3/8"	5/16"	1 3/16"	Rigid	Not Rated	Black , White	25	000000000	00000
	7/16"	5/16"	1 3/16"	Rigid	Not Rated	Black , White	25	000000000	00000
	1/2"	5/16"	1 3/16"	Rigid	Not Rated	Black , White	25	000000000	00000

Caps for Socket Head Screws

Cover screw heads to keep debris from clogging or damaging the drive. These caps fit snugly into the hex drive of socket head and button head screws. Push into place and pull to remove.

Polyethylene—Flexible and impact resistant, these caps take bumps and blows without cracking. They also won't absorb moisture, so they keep their shape in damp environments.

	Head Dia.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Polyethylene



	1/4"	1/2"	Flexible	150	Semi-Clear White	100	0000000	000000


	5/16"	0.59"	Flexible	150	Semi-Clear White	100	0000000	00000
	3/8"	0.69"	Flexible	150	Semi-Clear White	100	0000000	00000
	1/2"	0.88"	Flexible	150	Semi-Clear White	100	0000000	00000

Caps for Hex Nuts

Cap Installed on Hex

Nut

Image of Product. Front orientation. Protective Caps. Caps for Hex Nuts.

Seal out moisture and dirt to prevent corrosion and buildup on threads. These caps snap onto hex nuts for a tight fit.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Polyethylene



	7/16"	29/64"	Rigid	170	Black	10	0000000	00000


	1/2"	17/32"	Rigid	170	Black	10	0000000	0000
	35/64"	1/2"	Rigid	170	Black	10	0000000	0000
	43/64"	25/32"	Rigid	170	Black	10	0000000	0000
	3/4"	27/32"	Rigid	170	Black	10	0000000	00000
	7/8"	15/16"	Rigid	170	Black	5	0000000	0000
	15/16"	1"	Rigid	170	Black	5	0000000	00000
	1 1/16"	1"	Rigid	170	Black	5	0000000	0000
	1 1/4"	1 13/32"	Rigid	170	Black	5	0000000	00000
	1 13/32"	1 7/16"	Rigid	170	Black	5	0000000	00000
	1 5/8"	1 23/32"	Rigid	170	Black	1	0000000	0000


	1 13/16"	2"	Rigid	170	Black	1	0000000	0000
	1 31/32"	2 3/32"	Rigid	170	Black	1	0000000	00000
	2 3/16"	2 19/64"	Rigid	170	Black	1	0000000	00000
	2 3/8"	2 5/16"	Rigid	170	Black	1	0000000	00000
	2 9/16"	2 19/64"	Rigid	170	Black	1	0000000	00000
	2 3/4"	2 29/64"	Rigid	170	Black	1	0000000	00000

Screw-Head Mount Knobs


Style 1 (Front View)	Style 1 (Back View)	Style 2	Style 3	Style 4

Style 5	Style 6	Style 7 (Front View)	Style 7 (Back View)

To build a custom knob or thumb screw, pair one of these knobs with a hex or socket head screw and press the knob and screw together. All of these knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Made of plastic, they resist oil, grease, and solvents. Use color to identify equipment controls and components at a glance.

Style 1—Knurled-Head Grip

Style 1

(Front

View)

Style 1

(Back View)

		Head
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		Pkg.
Acetal—For Socket Head Screws



		No. 4	5/16"	11/64"	35 to 180	Black , Gray , Red , Yellow	100	000000000	000000


		No. 6	3/8"	3/16"	35 to 180	Black , Gray , Red , Yellow	100	000000000	00000
		No. 8	1/2"	7/32"	35 to 180	Black , Gray , Red , Yellow	100	000000000	00000
		No. 10	5/8"	1/4"	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		1/4"	3/4"	5/16"	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		1/4"	1"	5/16"	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		5/16"	1"	13/32"	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000
		M3	10 mm	4.5 mm	35 to 180	Black , Gray , Red , Yellow	50	000000000	0000
		M4	13 mm	5.5 mm	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		M5	16 mm	6.6 mm	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		M6	19 mm	7.8 mm	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000


		M6	26 mm	7.8 mm	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000
		M8	26 mm	9.8 mm	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000

Style 2—Single-Arm Grip

Style 2

		Head
	For Screw Size	Wd.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		Pkg.
Acetal—For Socket Head Screws



		No. 10	13/16"	11/32"	35 to 180	Black , Gray , Red , Yellow	50	000000000	000000


		1/4"	1"	7/16"	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		5/16"	1 3/16"	17/32"	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000

Style 3—Two-Arm Grip

Style 3

		Head
	For Screw Size	Wd.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		Pkg.
Acetal—For Socket Head Screws



		No. 10	1"	1/4"	35 to 180	Black , Gray , Red , Yellow	50	000000000	000000


		1/4"	1 1/4"	5/16"	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		5/16"	1 1/2"	13/32"	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000
		3/8"	1 3/4"	15/32"	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000
		M5	26 mm	6.6 mm	35 to 180	Black , Gray , Red , Yellow	50	000000000	0000
		M6	30 mm	7.8 mm	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		M8	38 mm	10.3 mm	35 to 180	Black , Gray , Red , Yellow	50	000000000	00000
		M10	45 mm	12.5 mm	35 to 180	Black , Gray , Red , Yellow	25	000000000	0000


		Nylon—For Socket Head Screws



				1/4"	1 1/8"	9/16"	-15 to 150	Black	1	00000000	0000

Style 4—Three-Arm Grip

Style 4

		Head
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Color	Pkg. Qty.		Pkg.
Polypropylene—For Socket Head Screws



		No. 10	3/4"	1/4"	-40 to 125	Black	10	000000000	00000

Style 5—Four-Arm Grip

Style 5

		Head
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Color	Pkg. Qty.		Pkg.
Polypropylene—For Hex Head Screws



		3/8"	2 1/4"	1"	-40 to 125	Black	10	000000000	000000

Style 6—Five-Arm Grip

Style 6

		Head
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Color	Pkg. Qty.		Pkg.
Polypropylene—For Hex Head Screws



		No. 10	1 1/4"	3/4"	-40 to 125	Black	10	000000000	000000

Style 7—Six-Arm Grip


Style 7 (Front View)	Style 7 (Back View)

		Head
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		Pkg.
Acetal—For Socket Head Screws



		1/4"	1 1/2"	15/32"	35 to 180	Black , Gray , Red , Yellow	10	000000000	00000


		5/16"	1 1/2"	13/32"	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		3/8"	1 1/2"	15/32"	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		M6	38 mm	12.2 mm	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		M8	38 mm	10.4 mm	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		M10	38 mm	12.5 mm	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000

Cap Nuts

Conceal and protect protruding screw threads while fastening parts together. These nuts help prevent damage to surrounding materials and reduce injuries. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Plastic

Image of Product. Front orientation. Cap Nuts. Cap Nuts.

Nylon 6/6—Slippery and abrasion resistant, these nuts thread on smoothly and stand up to daily wear and tear. Nylon will swell and weaken when exposed to moisture, so it's best for dry environments.

								Pkg.
	Thread Size	Wd.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		1-9	10-49	50-Up
Nylon 6/6



		4-40	1/4"	9/32"	-40 to 185	Black , Off-White	100	000000000	000000	000000	000000


		6-32	19/64"	11/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		8-32	21/64"	3/8"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		10-24	23/64"	13/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		10-32	23/64"	13/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		1/4"-20	27/64"	15/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		1/4"-28	27/64"	15/32"	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		5/16"-18	1/2"	17/32"	-40 to 185	Black , Off-White	50	000000000	00000	00000	00000
		5/16"-24	1/2"	17/32"	-40 to 185	Black , Off-White	50	000000000	00000	00000	00000
		3/8"-16	9/16"	5/8"	-40 to 185	Black , Off-White	25	000000000	00000	00000	0000
		3/8"-24	9/16"	5/8"	-40 to 185	Black , Off-White	25	000000000	00000	0000	0000


		7/16"-14	3/4"	13/16"	-40 to 185	Black , Off-White	10	000000000	0000	0000	0000
		1/2"-13	3/4"	13/16"	-40 to 185	Black , Off-White	25	000000000	00000	00000	00000
		1/2"-20	3/4"	13/16"	-40 to 185	Black , Off-White	10	000000000	0000	0000	0000
		5/8"-11	15/16"	31/32"	-40 to 185	Black , Off-White	20	000000000	00000	00000	00000
		M4 × 0.7 mm	7 mm	8 mm	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		M5 × 0.8 mm	8 mm	10 mm	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		M6 × 1 mm	10 mm	12 mm	-40 to 185	Black , Off-White	100	000000000	00000	00000	00000
		M8 × 1.25 mm	13 mm	15 mm	-40 to 185	Black , Off-White	50	000000000	00000	00000	00000
		M10 × 1.5 mm	17 mm	18 mm	-40 to 185	Black , Off-White	25	000000000	00000	00000	00000
		M12 × 1.75 mm	19 mm	20.5 mm	-40 to 185	Black , Off-White	25	000000000	00000	00000	00000

Screw-Head Mount Precise-Control Indicating Knobs

Knurled-Head

Grip

Six-Arm

Grip

To build a custom precise-control knob or thumb screw, pair one of these knobs with a socket head screw. Press the knob and screw together using a bench vise or an arbor press. Then, turn the knob to move the screw 0.005" per graduation and make precise adjustments. Made of acetal, these knobs resist oil, grease, and solvents.

		Head
	For Thread Size	Dia.	Ht.	For Screw Head Type	Temp. Range, ° F		Each
Knurled-Head Grip







				Black Acetal

				1/4"-20	1"	5/16"	Socket	35 to 180	000000000	00000


				Six-Arm Grip







								Black Acetal

								1/4"-20	1 1/2"	1/2"	Socket	35 to 180	000000000	0000

Screw-Head Mount Knob Assortments


Inch Assortment	Metric Assortment

Keep a convenient selection of knobs on hand. To build a custom knob or thumb screw, pair one of these knobs with a socket head screw. Press the knob and screw together using a bench vise or an arbor press. Use these knobs to provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Made of plastic, they resist oil, grease, and solvents.

	For Screw Size	Temp. Range, ° F		Each
Black Acetal







	For Socket Head Screws

	295	Knurled Head Single Arm Two Arm Six Arm	140 15 80 60	No. 4, No. 6, No. 8, No. 10, 1/4", 5/16" No. 10, 1/4", 5/16" No. 10, 1/4", 5/16", 3/8" 1/4", 5/16", 3/8"	35 to 180	000000000	0000000


	260	Knurled Head Two Arm Six Arm	120 80 60	M3, M4, M5, M6, M8 M5, M6, M8, M10 M6, M8, M10	35 to 180	000000000	000000

Screw-Head Mount Knobs with Messages

Use these knobs to display important messages. To build a custom knob or thumb screw, pair one of these knobs with a socket head screw. Press the knob and screw together using a bench vise or an arbor press. All of these knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Made of plastic, they resist oil, grease, and solvents.

Knurled-Head Grip


				Back View

		Head				Caution		Do Not Remove		Lock/Unlock		Service Access
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Pkg. Qty.		Pkg.		Pkg.		Pkg.		Pkg.
Black—For Socket Head Screws



		No. 8	1/2"	1/4"	32 to 180	5	000000000	00000	000000000	00000	000000000	00000	000000000	00000


		No. 10	5/8"	1/4"	32 to 180	5	000000000	0000	000000000	0000	000000000	0000	000000000	0000
		1/4"	3/4"	5/16"	32 to 180	5	000000000	0000	000000000	0000	000000000	0000	000000000	0000
		5/16"	1"	7/16"	32 to 180	5	000000000	0000	000000000	0000	000000000	0000	000000000	0000