Plastic Screw Caps | McMaster-Carr

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For Use With

Head Height

Maximum Temperature

For Screw Head Type

Nut Width

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Export Control Classification Number (ECCN)

EAR99

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

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DFARS Specialty Metals

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90 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	91620A100	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	91620A400	00000
	No. 8, No. 10	7/64"	35/64"	Rigid	250	Black, White	100	91620A200	00000
	1/4"	5/32"	45/64"	Rigid	250	Black, White	100	91620A300	00000
	3/8"	19/64"	61/64"	Rigid	250	Black, White	100	91620A110	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	94052A021	000000


		No. 6	3/8"	3/16"	35 to 180	Black, Gray, Red, Yellow	100	94052A023	00000
		No. 8	1/2"	7/32"	35 to 180	Black, Gray, Red, Yellow	100	94052A025	00000
		No. 10	5/8"	1/4"	35 to 180	Black, Gray, Red, Yellow	50	94052A031	00000
		1/4"	3/4"	5/16"	35 to 180	Black, Gray, Red, Yellow	50	94052A033	00000
		1/4"	1"	5/16"	35 to 180	Black, Gray, Red, Yellow	50	94052A034	00000
		5/16"	1"	13/32"	35 to 180	Black, Gray, Red, Yellow	25	94052A036	0000
		M3	10 mm	4.5 mm	35 to 180	Black, Gray, Red, Yellow	50	91175A061	00000
		M4	13 mm	5.5 mm	35 to 180	Black, Gray, Red, Yellow	50	91175A062	00000
		M5	16 mm	6.6 mm	35 to 180	Black, Gray, Red, Yellow	50	91175A063	00000
		M6	19 mm	7.8 mm	35 to 180	Black, Gray, Red, Yellow	25	91175A064	0000


		M6	26 mm	7.8 mm	35 to 180	Black, Gray, Red, Yellow	25	91175A065	0000
		M8	26 mm	9.8 mm	35 to 180	Black, Gray, Red, Yellow	25	91175A066	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	94052A014	000000


		1/4"	1"	7/16"	35 to 180	Black, Gray, Red, Yellow	50	94052A016	00000
		5/16"	1 3/16"	17/32"	35 to 180	Black, Gray, Red, Yellow	50	94052A018	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	94052A051	000000


		1/4"	1 1/4"	5/16"	35 to 180	Black, Gray, Red, Yellow	50	94052A053	00000
		5/16"	1 1/2"	13/32"	35 to 180	Black, Gray, Red, Yellow	25	94052A055	0000
		3/8"	1 3/4"	15/32"	35 to 180	Black, Gray, Red, Yellow	25	94052A057	0000
		M5	26 mm	6.6 mm	35 to 180	Black, Gray, Red, Yellow	50	91175A081	00000
		M6	30 mm	7.8 mm	35 to 180	Black, Gray, Red, Yellow	50	91175A082	00000
		M8	38 mm	10.3 mm	35 to 180	Black, Gray, Red, Yellow	50	91175A083	00000
		M10	45 mm	12.5 mm	35 to 180	Black, Gray, Red, Yellow	25	91175A084	0000


		Nylon—For Socket Head Screws



				1/4"	1 1/8"	9/16"	-15 to 150	Black	1	65035K81	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	94052A510	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	94052A620	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	94052A550	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	94052A041	00000


		5/16"	1 1/2"	13/32"	35 to 180	Black, Gray, Red, Yellow	10	94052A043	0000
		3/8"	1 1/2"	15/32"	35 to 180	Black, Gray, Red, Yellow	10	94052A046	0000
		M6	38 mm	12.2 mm	35 to 180	Black, Gray, Red, Yellow	10	91175A071	0000
		M8	38 mm	10.4 mm	35 to 180	Black, Gray, Red, Yellow	10	91175A072	0000
		M10	38 mm	12.5 mm	35 to 180	Black, Gray, Red, Yellow	10	91175A073	0000

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	91620A120	000000


	No. 6	1/8"	1/2"	Rigid	Not Rated	Black, White	25	91620A130	00000
	No. 8	7/32"	1/2"	Rigid	Not Rated	Black, White	25	91620A140	00000
	No. 10	11/64"	23/32"	Rigid	Not Rated	Black	25	91620A930	0000
	No. 12	11/64"	23/32"	Rigid	Not Rated	Black	25	91620A950	0000
	1/4"	5/16"	1 3/16"	Rigid	Not Rated	Black, White	25	91620A150	00000
	5/16"	5/16"	1 3/16"	Rigid	Not Rated	Black, White	25	91620A160	00000
	3/8"	5/16"	1 3/16"	Rigid	Not Rated	Black, White	25	91620A170	00000
	7/16"	5/16"	1 3/16"	Rigid	Not Rated	Black, White	25	91620A180	00000
	1/2"	5/16"	1 3/16"	Rigid	Not Rated	Black, White	25	91620A190	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	1048N11	000000


	5/16"	0.59"	Flexible	150	Semi-Clear White	100	1048N12	00000
	3/8"	0.69"	Flexible	150	Semi-Clear White	100	1048N13	00000
	1/2"	0.88"	Flexible	150	Semi-Clear White	100	1048N14	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	9267K55	00000


	1/2"	17/32"	Rigid	170	Black	10	9267K41	0000
	35/64"	1/2"	Rigid	170	Black	10	9267K43	0000
	43/64"	25/32"	Rigid	170	Black	10	9267K31	0000
	3/4"	27/32"	Rigid	170	Black	10	9267K45	00000
	7/8"	15/16"	Rigid	170	Black	5	9267K32	0000
	15/16"	1"	Rigid	170	Black	5	9267K47	00000
	1 1/16"	1"	Rigid	170	Black	5	9267K33	0000
	1 1/4"	1 13/32"	Rigid	170	Black	5	9267K34	00000
	1 13/32"	1 7/16"	Rigid	170	Black	5	9267K35	00000
	1 5/8"	1 23/32"	Rigid	170	Black	1	9267K36	0000


	1 13/16"	2"	Rigid	170	Black	1	9267K17	0000
	1 31/32"	2 3/32"	Rigid	170	Black	1	9267K18	00000
	2 3/16"	2 19/64"	Rigid	170	Black	1	9267K51	00000
	2 3/8"	2 5/16"	Rigid	170	Black	1	9267K52	00000
	2 9/16"	2 19/64"	Rigid	170	Black	1	9267K53	00000
	2 3/4"	2 29/64"	Rigid	170	Black	1	9267K54	00000

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	91165A880	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	91165A440	000000

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	93228A400	00000


				Six-Arm Grip







								Black Acetal

								1/4"-20	1 1/2"	1/2"	Socket	35 to 180	93228A500	0000

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	92144A110	00000	92144A130	00000	92144A150	00000	92144A170	00000


		No. 10	5/8"	1/4"	32 to 180	5	92144A210	0000	92144A230	0000	92144A250	0000	92144A270	0000
		1/4"	3/4"	5/16"	32 to 180	5	92144A310	0000	92144A330	0000	92144A350	0000	92144A370	0000
		5/16"	1"	7/16"	32 to 180	5	92144A410	0000	92144A430	0000	92144A450	0000	92144A470	0000