Hex Head Covers | McMaster-Carr

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138 Products

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

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. 6, No. 8	13/64"	33/64"	Rigid	Not Rated	Silver	25	91620A600	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

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

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

Fully-Threaded Standoff Caps

Give open-ended standoffs a finished look and protect them from dirt and debris.

18-8 Stainless Steel—Stainless steel caps have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

Aluminum—Aluminum caps have good corrosion resistance, are lightweight, and are nonmagnetic.

Steel—Steel caps are stronger than aluminum.

Choose a Thread Size		Each







For 1/4" Standoff OD

18-8 Stainless Steel	1/4"	3/8"	4-40 , 6-32 , 8-32 , 10-32	93558A710	00000


Aluminum	1/4"	3/8"	4-40 , 6-32 , 8-32 , 10-32	93558A715	0000
Zinc-Plated Steel	1/4"	3/8"	4-40 , 6-32 , 8-32 , 10-32	93558A720	0000
Zinc-Plated Brass	1/4"	3/8"	4-40 , 6-32 , 8-32 , 10-32	93558A725	0000

Low-Profile Fully-Threaded Standoff Caps

Standoff Cap

Installation Tools

A thin head means these caps sit nearly flush with your surface for a clean look. All caps are aluminum and have good corrosion resistance, are lightweight, and are nonmagnetic.

Standoff Cap Installation Tools—Installation tools (sold separately) make gripping and tightening easy.

	Standoff Caps								Standoff Cap Installation Tools
	Set Screw
	Thread Lg.	Material	Cap Ht.	Cap Material	For Min. Panel Thk.	For Mounting Hole Dia.		Each		Each
For 1/4"-20 Standoff Thread Size







				For 1" Standoff OD

				1/2"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N33	000000	4394N81	00000


				3/4"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N34	00000	4394N81	0000
				7/8"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N24	00000	4394N81	0000
				1"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N35	00000	4394N81	0000
				1 1/4"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N36	00000	4394N81	0000
				1 5/16"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N25	00000	4394N81	0000
				1 1/2"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N37	00000	4394N81	0000
				1 13/16"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N26	00000	4394N81	0000
				3 1/16"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N27	00000	4394N81	0000




						For 1 1/4" Standoff OD

						1/2"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N38	00000	4394N81	0000


						3/4"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N39	00000	4394N81	0000
						7/8"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N28	00000	4394N81	0000
						1"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N41	00000	4394N81	0000
						1 1/4"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N42	00000	4394N81	0000
						1 5/16"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N29	00000	4394N81	0000
						1 1/2"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N43	00000	4394N81	0000
						1 13/16"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N31	00000	4394N81	0000
						3 1/16"	Steel	1/8"	Aluminum	1/4"	9/16"	4394N32	00000	4394N81	0000


						For 5/16"-18 Standoff Thread Size







										For 1" Standoff OD

										1/2"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N11	00000	4394N81	0000


										5/8"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N12	00000	4394N81	0000
										3/4"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N13	00000	4394N81	0000
										7/8"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N14	00000	4394N81	0000
										1"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N15	00000	4394N81	0000
										1 1/4"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N16	00000	4394N81	0000




												For 1 1/4" Standoff OD

												1/2"	Stainless Steel	1/8"	Aluminum	1/4"	9/16"	4394N17	00000	4394N81	0000


5/8"	Stainless Steel											1/8"	Aluminum	1/4"	9/16"	4394N18	00000	4394N81	0000
3/4"	Stainless Steel											1/8"	Aluminum	1/4"	9/16"	4394N19	00000	4394N81	0000
7/8"	Stainless Steel											1/8"	Aluminum	1/4"	9/16"	4394N21	00000	4394N81	0000
1"	Stainless Steel	1/8"										Aluminum	1/4"	9/16"	4394N22	00000	4394N81	0000
1 1/4"	Stainless Steel	1/8"	Aluminum									1/4"	9/16"	4394N23	00000	4394N81	0000

Tamper-Resistant Fully-Threaded Standoff Caps

Standoff Cap

Security Tools

Pin holes on the side of these caps let you insert a security tool (sold separately) for increased leverage when tightening, making them difficult to remove. All caps are aluminum and have good corrosion resistance, are lightweight, and are nonmagnetic.

	Standoff Caps							Standoff Cap Security Tools
	Set Screw
	Thread Lg.	Material	Cap Ht.	Cap Material	For Mounting Hole Dia.		Each		Each
For 1/4"-20 Standoff Thread Size







				For 3/4" Standoff OD

				7/8"	Steel	5/16"	Aluminum	3/8"	4348N31	00000	4348N81	00000


				1 5/16"	Steel	5/16"	Aluminum	3/8"	4348N32	0000	4348N81	0000
				1 13/16"	Steel	5/16"	Aluminum	3/8"	4348N33	0000	4348N81	0000
				3 1/16"	Steel	5/16"	Aluminum	3/8"	4348N34	0000	4348N81	0000




						For 1" Standoff OD

						7/8"	Steel	5/16"	Aluminum	3/8"	4348N35	0000	4348N81	0000


						1 5/16"	Steel	5/16"	Aluminum	3/8"	4348N36	0000	4348N81	0000
						1 13/16"	Steel	5/16"	Aluminum	3/8"	4348N37	0000	4348N81	0000
						3 1/16"	Steel	5/16"	Aluminum	3/8"	4348N38	0000	4348N81	0000




								For 1 1/4" Standoff OD

								7/8"	Steel	5/16"	Aluminum	3/8"	4348N39	00000	4348N81	0000


								1 5/16"	Steel	5/16"	Aluminum	3/8"	4348N41	0000	4348N81	0000
								1 13/16"	Steel	5/16"	Aluminum	3/8"	4348N42	0000	4348N81	0000
								3 1/16"	Steel	5/16"	Aluminum	3/8"	4348N43	00000	4348N81	0000


								For 5/16"-18 Standoff Thread Size







												For 3/4" Standoff OD

												1/2"	Stainless Steel	5/16"	Aluminum	3/8"	4348N11	0000	4348N81	0000


												5/8"	Stainless Steel	5/16"	Aluminum	3/8"	4348N12	0000	4348N81	0000
												3/4"	Stainless Steel	5/16"	Aluminum	3/8"	4348N13	0000	4348N81	0000
												7/8"	Stainless Steel	5/16"	Aluminum	3/8"	4348N14	0000	4348N81	0000
												1"	Stainless Steel	5/16"	Aluminum	3/8"	4348N15	0000	4348N81	0000
												1 1/4"	Stainless Steel	5/16"	Aluminum	3/8"	4348N16	0000	4348N81	0000




														For 1" Standoff OD

1/2"	Stainless Steel													5/16"	Aluminum	3/8"	4348N17	0000	4348N81	0000


5/8"	Stainless Steel													5/16"	Aluminum	3/8"	4348N18	0000	4348N81	0000
3/4"	Stainless Steel	5/16"												Aluminum	3/8"	4348N19	0000	4348N81	0000
7/8"	Stainless Steel	5/16"	Aluminum											3/8"	4348N21	0000	4348N81	0000
1"	Stainless Steel	5/16"	Aluminum											3/8"	4348N22	0000	4348N81	0000
1 1/4"	Stainless Steel	5/16"	Aluminum											3/8"	4348N23	0000	4348N81	0000




		For 1 1/4" Standoff OD

		1/2"	Stainless Steel											5/16"	Aluminum	3/8"	4348N24	0000	4348N81	0000


		5/8"	Stainless Steel	5/16"										Aluminum	3/8"	4348N25	0000	4348N81	0000
		3/4"	Stainless Steel	5/16"	Aluminum									3/8"	4348N26	0000	4348N81	0000
		7/8"	Stainless Steel	5/16"	Aluminum									3/8"	4348N27	0000	4348N81	0000
		1"	Stainless Steel	5/16"	Aluminum									3/8"	4348N28	0000	4348N81	0000
		1 1/4"	Stainless Steel	5/16"	Aluminum									3/8"	4348N29	0000	4348N81	0000

Stainless Steel Socket Head Screws


Fully Threaded	Partially Threaded

These screws won't rust or corrode when exposed to moisture and chemicals. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

Silver-Plated 18-8 Stainless Steel—The silver plating helps these screws thread on smoothly during installation. They also won't rust in wet and outdoor environments.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
Silver-Plated 18-8 Stainless Steel







				2-56

				1/8"	0.14"	0.086"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A221	00000


				3/16"	0.14"	0.086"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A231	0000
				1/4"	0.14"	0.086"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A241	0000
				3/8"	0.14"	0.086"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A251	0000
				1/2"	0.14"	0.086"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A261	0000




						4-40

						1/4"	0.183"	0.112"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A421	0000


						3/8"	0.183"	0.112"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A431	0000
						1/2"	0.183"	0.112"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A441	0000
						5/8"	0.183"	0.112"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A451	00000
						3/4"	0.183"	0.112"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A461	0000




								6-32

								1/4"	0.226"	0.138"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A621	0000


								3/8"	0.226"	0.138"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A631	0000
								1/2"	0.226"	0.138"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A641	0000
								5/8"	0.226"	0.138"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A651	0000
								3/4"	0.226"	0.138"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A661	0000
								1"	0.226"	0.138"	Partially Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A671	0000




										8-32

										3/8"	0.27"	0.164"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A821	0000


										1/2"	0.27"	0.164"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A831	0000
										5/8"	0.27"	0.164"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A841	00000
										3/4"	0.27"	0.164"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A851	00000
										1"	0.27"	0.164"	Partially Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A861	00000




												10-24

												1/2"	5/16"	0.19"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A321	00000


3/4"	5/16"											0.19"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A331	00000
1"	5/16"											0.19"	Partially Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A341	00000




		10-32

		3/8"	5/16"									0.19"	Fully Threaded	Fine	70,000	ASME B18.3, ASTM F837	5	90008A521	0000


		1/2"	5/16"									0.19"	Fully Threaded	Fine	70,000	ASME B18.3, ASTM F837	5	90008A531	00000
		5/8"	5/16"									0.19"	Fully Threaded	Fine	70,000	ASME B18.3, ASTM F837	5	90008A541	00000
		3/4"	5/16"									0.19"	Fully Threaded	Fine	70,000	ASME B18.3, ASTM F837	5	90008A551	00000
		1"	5/16"									0.19"	Partially Threaded	Fine	70,000	ASME B18.3, ASTM F837	5	90008A561	00000




				1/4"-20

				1/2"	3/8"							1/4"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A711	00000


				5/8"	3/8"							1/4"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A721	00000
				3/4"	3/8"							1/4"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A731	00000
				1"	3/8"							1/4"	Fully Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A741	00000
				1 1/4"	3/8"							1/4"	Partially Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A751	00000
				1 1/2"	3/8"							1/4"	Partially Threaded	Coarse	70,000	ASME B18.3, ASTM F837	5	90008A761	00000