Flip Caps | McMaster-Carr

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D.O.T. Compliant 49 CFR 173.301

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39 Products

Locking Drum Plug Caps


Male	Female

Prevent tampering with the contents of your drum while allowing access for filling.

	Gender	Dia.	Ht.	Lock Type	Lock Included	For Max. Shackle Dia.		Each
Iron



	2 NPT	Male	3 1/8"	2 1/4"	Padlockable	No	7/16"	4906K21	000000


	2 NPT	Female	3 1/8"	1 3/8"	Padlockable	No	5/16"	4906K23	00000
	3 NPT	Female	4 1/2"	2"	Padlockable	No	1/2"	4906K27	00000
	4 NPT	Female	5 1/4"	2 1/4"	Padlockable	No	1/2"	4906K29	000000

Battery Vent Caps

Flip open these caps to check the water level and fill a wet-cell lead-acid battery.

Connection Method	ID	Material	Includes	Dia.	Ht.	Pkg. Qty.		Pkg.
Bayonet	1"	Polypropylene	Rubber Washer	1 3/8"	1 7/8"	6	7045K8	000000

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

Lockable Breather Vents with Cap

Secure access to vented openings in pipe and tanks—the cap can be locked to prevent tampering. These breather vents allow you to add a filling port to your hydraulic tank while protecting against excess pressure and vacuum. Use them to stop debris from entering your tank. Breather vents mount on top of standard tank openings with included hardware. Padlock is not included.

Threaded NPT Male

Aluminum Body

	Max. Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Cap Material	Screen Material	For Max. Padlock Shackle Dia.		Each
Aluminum Body and Fitting



	2	Not Rated	200	4 1/2"	5 5/8"	Air, Oil, Water	Aluminum	Stainless Steel	3/8"	4906K11	000000

Gas Tank Safety Caps

Protect the valve of high-pressure gas tanks. The cap fits tanks with and without a regulator.

For Cylinder Size	Thread Size	Material	Specs. Met		Each
K, T	3 1/8"-11	Steel	D.O.T. Compliant 49 CFR 173.301, OSHA Compliant 29 CFR 1910.253	7784A32	0000000

Tethered Caps

A ring connects caps to parts so they don’t get lost when removed. Good for threaded connections you need to access frequently, they block dirt and debris from entering valves, pipe, and tubing.

Vinyl Plastic—A good all-around choice, these durable caps won’t rip or shred, even with repeated use. They also hold up to oils, mild acids, and solvents. Caps are flexible and conform to parts for a tight fit.

						Tether
	For OD	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Lg.	Hole Dia.	Pkg. Qty.		Pkg.
Vinyl Plastic



		1/2"	1/2"	Flexible	200	Black	1"	7/16"	10	2870N15	00000


		5/8"	1/2"	Flexible	200	Black	1 1/8"	5/8"	10	2870N16	0000
		3/4"	1/2"	Flexible	200	Black	1 1/8"	3/4"	10	2870N17	0000
		1"	1"	Flexible	200	Black	1 3/4"	1"	10	2870N18	0000
		1 1/4"	1"	Flexible	200	Black	2 1/16"	1 5/16"	10	2870N19	0000

Gas Cylinder Lockouts

Prohibit access to the main valve on a gas cylinder. These lockouts secure with a padlock and lockout tag. They help you comply with OSHA 29 CFR 1910.147, which requires handles on pneumatic and hydraulic systems to be locked out during maintenance to prevent injuries.

Powder-Coated Steel


C (Padlock Not Included)	C (Shown Open)

Steel lockouts are stronger than plastic lockouts. They’re also powder coated for corrosion resistance.

Style C—Style C fit most high- and low-pressure gas cylinders, including D.O.T. cylinders. When you need to use your cylinder, you can leave these lockouts on—the cover swings up and out of the way when they’re unlocked. To lock out again, snap the cover back on.

		Thread
	Style	Type	Spacing	Direction	Gender	For Max. No. of Padlocks	For Max. Padlock Shackle Dia.	Overall Lg.	Max. Temp., ° F	Color	Includes	Specs. Met		Each
For Low Pressure Gas Cylinders



		C	UNC	Coarse	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	3409A111	0000000


		C	UNF	Fine	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	3409A112	000000


		For High Pressure Gas Cylinders



				C	UNC	Coarse	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	3409A113	000000


				C	UNF	Fine	Right Hand	Female	1	1/4"	11"	200	Yellow	Padlock Three Keys	OSHA Compliant 29 CFR 1910.147	3409A114	000000

Hazardous-Location Safe-Break Pin-and-Sleeve Electrical Connector Caps

Caps are watertight to protect hazardous location safe-break plugs when not in use.

	Mfr.	Mfr. Model No.	Material	Color		Each
For Plugs



	1.4"	Meltric	22-1A426	Neoprene	Black	1590N24	000000


	1.9"	Meltric	22-3A426	Neoprene	Black	1590N54	00000
	2.1"	Meltric	22-6A426	Neoprene	Black	1590N84	00000

Safe-Break Pin-and-Sleeve Electrical Connector Caps

Caps are watertight to protect safe-break plugs when not in use.

	Mfr.	Mfr. Model No.	Material	Color	Environment	Enclosure Rating		Each
For Plugs



	1.3"	Meltric	61-1A426	Neoprene	Black	Corrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, Wet	IP66, IP67, IP69K, NEMA 4X	6737K511	000000


	1.8"	Meltric	61-3A426	Neoprene	Black	Corrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, Wet	IP66, IP67, IP69K, NEMA 4X	6737K512	00000
	2.2"	Meltric	61-6A426	Neoprene	Black	Corrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, Wet	IP66, IP67, IP69K, NEMA 4X	6737K513	00000
	2.6"	Meltric	31-6A426	Neoprene	Black	Corrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, Wet	IP66, IP67, IP69K, NEMA 4X	6737K514	00000

Washdown Plug and Socket Electrical Connector Caps


For Plugs	For Sockets

Caps can be used with straight-blade and turn-lock plugs and sockets.

					Black			Yellow
	For OD	Mfr.	Material	Enclosure Rating	Mfr. Model No.		Each	Mfr. Model No.		Each
For Plugs



		1.9"	Molex	Rubber	IP67	14WBLK	69435K321	000000	14W	69435K311	000000


		2.5"	Molex	Rubber	IP67	26WBLK	69435K361	00000	26W	69435K351	00000
		2.8"	Molex	Rubber	IP67	28WBLK	69435K411	00000	28W	69435K391	00000


		For Sockets



				1.9"	Molex	Rubber	IP67	—	———	0	50W50	69435K331	00000


				2.5"	Molex	Rubber	IP67	50W52BLK	69435K381	00000	50W52	69435K371	00000
				2.8"	Molex	Rubber	IP67	50W54BLK	69435K431	00000	50W54	69435K421	00000