NPTF Grease Fittings | McMaster-Carr

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Grease Fitting Style

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Maximum Pressure

1,000 psi to 1,999 psi

4,000 psi to 9,999 psi

10,000 psi or greater

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

Yes

Dispensing Tip Connection Thread Type

NPTF

Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

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57 Products

Grease Fittings

Thread these fittings into motors, bearings, engine blocks, and other machinery to create a lubrication point. They’re also known as hydraulic grease fittings.

Straight with Male Thread

NPTF Thread—PTF-SAE and NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel fittings have mild corrosion resistance.

Ball Check Valve—Fittings with a check valve prevent grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.

										Pkg.
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
3/8 NPTF Thread



		Zinc-Plated Steel	51/64"	5/16"	5/16"	43/64"	10,000	Ball	5	1095K54	000000	000000

Straight with Female Thread

NPTF Thread—PTF-SAE and NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel fittings have mild corrosion resistance.

Ball Check Valve—Fittings with a check valve prevent grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.

										Pkg.
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
1/8 NPTF Thread



		Zinc-Plated Steel	1"	9/32"	9/32"	1/2"	10,000	Ball	10	1095K15	000000	000000

Button Head Grease Fittings

Often used on earth movers, mining equipment, and other heavy machinery, these fittings have a T-shaped top that holds the dispensing tip in place so it won’t pop off when adding grease. They're best for machinery requiring high volumes of grease because they let more grease pass through than standard grease fittings, thanks to a larger opening. An integral check valve prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.

Straight with Male Thread

Image of Product. Front orientation. Grease Fittings. Button Head Grease Fittings, Male, Straight.

NPTF Thread—PTF-SAE and NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel fittings have mild corrosion resistance.

303 Stainless Steel—303 stainless steel fittings are more corrosion resistant than zinc-plated steel fittings and have good chemical resistance.

316 Stainless Steel—316 stainless steel fittings resist corrosion and chemicals better than 303 stainless steel fittings and can be used in saltwater environments.

										Each
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Head Dia.	Max. Pressure, psi	Check Valve Type		1-9	10-Up
1/8 NPTF Thread



		303 Stainless Steel	45/64"	3/16"	9/32"	43/64"	5/8"	10,000	Ball	8900T11	000000	000000


		316 Stainless Steel	5/8"	15/64"	15/64"	19/32"	5/8"	1,450	Ball	1094K36	00000	00000


		1/4 NPTF Thread



				Zinc-Plated Steel	53/64"	13/32"	27/64"	5/8"	5/8"	6,000	Plunger	1094K43	0000	0000


				Zinc-Plated Steel	1 3/8"	33/64"	19/32"	7/8"	7/8"	14,500	Plunger	1094K76	00000	0000
				303 Stainless Steel	53/64"	1/4"	13/32"	43/64"	5/8"	10,000	Ball	8900T12	00000	00000
				316 Stainless Steel	53/64"	7/16"	7/16"	43/64"	5/8"	1,450	Ball	1094K31	00000	00000


				3/8 NPTF Thread



						Zinc-Plated Steel	61/64"	13/32"	31/64"	3/4"	5/8"	6,000	Plunger	1094K44	0000	0000


						Zinc-Plated Steel	1 5/16"	13/32"	9/16"	7/8"	7/8"	10,000	Plunger	1094K17	00000	0000
						303 Stainless Steel	59/64"	1/2"	1/2"	3/4"	5/8"	10,000	Ball	8900T13	00000	00000


						1/2 NPTF Thread



								Zinc-Plated Steel	1 1/16"	1/2"	1/2"	7/8"	7/8"	8,000	Plunger	1094K28	0000	0000


								Zinc-Plated Steel	1 1/16"	17/32"	35/64"	7/8"	5/8"	6,000	Plunger	1094K53	0000	0000

Straight with Female Thread

NPTF Thread—PTF-SAE and NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel fittings have mild corrosion resistance.

										Each
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Head Dia.	Max. Pressure, psi	Check Valve Type		1-9	10-Up
1/8 NPTF Thread



		Zinc-Plated Steel	31/32"	13/32"	13/32"	5/8"	5/8"	6,000	Plunger	1094K51	00000	00000

Leakproof Grease Fittings

Keep thin grease from leaking out—the check valve in these fittings has a Buna-N seat that creates a tighter seal than check valves in other grease fittings. The valve stays closed when not in use to keep out dirt and other contaminants. Fittings are zinc-plated steel, which has mild corrosion resistance. They're also known as hydraulic grease fittings. They have PTF-SAE and NPTF (Dryseal) threads, which are compatible with NPT threads.

Straight with Male Thread

										Pkg.
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
1/8 NPTF Thread



		Zinc-Plated Steel	1"	11/32"	33/64"	7/16"	10,000	Ball	5	2309K98	000000	000000

90° Elbow with Male Thread

Image of Product. Front orientation. Grease Fittings. Leakproof Grease Fittings, Male, 90° Elbow.

										Pkg.
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
1/8 NPTF Thread



		Zinc-Plated Steel	31/32"	17/64"	25/64"	7/16"	5,000	Disc	1	2309K95	00000	00000

30° Elbow with Male Thread

										Pkg.
	Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
1/8 NPTF Thread



		Zinc-Plated Steel	1 7/32"	17/64"	25/64"	7/16"	5,000	Disc	5	2309K92	000000	000000

Grease Fitting Adapters

When the size or thread type of a fitting doesn't match an existing opening, use these adapters to make the connection.

Straight

SAE-LT Thread—SAE-LT threads are tapered but designed to be installed into a _1/4"-28 straight-thread UNF hole.

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel adapters have mild corrosion resistance.

Brass—Brass adapters resist corrosion better than zinc-plated steel adapters.

303 Stainless Steel—303 stainless steel adapters are more corrosion resistant than brass adapters and have good chemical resistance.

Connection
Male	Female	Material		Each



	SAE-LT 1/4"-28	NPTF 1/8	Zinc-Plated Steel	9006T11	00000


	SAE-LT 1/4"-28	NPTF 1/8	303 Stainless Steel	9006T31	00000
	BSPT 1/8	NPTF 1/8	Brass	50785K828	0000

90° Elbow

SAE-LT Thread—SAE-LT threads are tapered but designed to be installed into a _1/4"-28 straight-thread UNF hole.

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel adapters have mild corrosion resistance.

303 Stainless Steel—303 stainless steel adapters are more corrosion resistant than brass adapters and have good chemical resistance.

Connection
Male	Female	Material		Each



	NPTF 1/8	NPTF 1/8	303 Stainless Steel	9006T36	000000


	SAE-LT 1/4"-28	NPTF 1/8	Zinc-Plated Steel	9006T13	00000
	SAE-LT 1/4"-28	NPTF 1/8	303 Stainless Steel	9006T33	00000

45° Elbow

SAE-LT Thread—SAE-LT threads are tapered but designed to be installed into a _1/4"-28 straight-thread UNF hole.

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

Zinc-Plated Steel—Zinc-plated steel adapters have mild corrosion resistance.

303 Stainless Steel—303 stainless steel adapters are more corrosion resistant than brass adapters and have good chemical resistance.

Connection
Male	Female	Material		Each



	NPTF 1/8	NPTF 1/8	303 Stainless Steel	9006T35	000000


	SAE-LT 1/4"-28	NPTF 1/8	Zinc-Plated Steel	9006T12	00000
	SAE-LT 1/4"-28	NPTF 1/8	303 Stainless Steel	9006T32	00000

Grease-Dispensing Tips


Style A	Style F	Style G

Style K	Style L	Style N

Attach dispensing tips to nozzles to deliver lubricant through grease fittings or to bare lubrication points.

		Dispensing Tip				Dispensing Tip Connection
	Style	Lg.	Style	Material	Max. Grease Outlet Pressure, psi	Thread Type	Pipe Size	Gender	Features		Each
For Standard Grease Fittings



		A	1 7/16"	Straight	Steel	10,000	NPTF	1/8	Female	—	1879K23	000000


		A	1 9/16"	Straight	Steel	10,000	NPTF	1/8	Female	—	1091K5	00000
		F	4"	Adjustable Angle	Steel	10,000	NPTF	1/8	Female	360° Rotation	1091K73	000000


		For 5/8" Button Head Grease Fittings



				G	1 5/8"	90° Angle	Steel	10,000	NPTF	1/8	Female	—	1091K42	00000


				For 7/8" Button Head Grease Fittings



						G	1 1/4"	90° Angle	Steel	15,000	NPTF	1/8	Female	—	1091K44	00000


						For Pin-Style Grease Fittings



								K	2"	Straight	Steel	10,000	NPTF	1/8	Female	—	1091K17	00000


								K	2 1/8"	Straight	Steel	10,000	NPTF	1/8	Male	—	1091K16	00000
								L	1 11/16"	Straight	Steel	10,000	NPTF	1/8	Female	—	1091K74	00000


								For Flush-Style Grease Fittings



										N	1 1/4"	Straight	Steel	10,000	NPTF	1/8	Female	—	1091K9	00000

Grease Tip Repair Kits

		Each
Repair Kit for 1091K42	1091K72	0000000
Repair Kit for 1091K44	1091K71	000000

Flush-Style Grease Fittings


Male Straight Style A	Male Straight Style B	Male Straight Style C

The nipple doesn't stick out, so these fittings fit in tight spaces and won't be damaged if something knocks into them. An integral check valve prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants.

Straight with Male Thread


Style A	Style B	Style C

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

Styles A and B—Install Styles A, B, and D with a slotted screwdriver.

Style C—Install Style C with a hex wrench.

Zinc-Plated Steel—Zinc-plated steel fittings have mild corrosion resistance.

												Pkg.
	Style	Material	Overall Ht.	Thread Lg.	Shank Lg.	Slot Lg.	Hex Size	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
1/8 NPTF Thread



		A	Zinc-Plated Steel	23/64"	19/64"	23/64"	13/32"	—	10,000	Ball	5	10595K11	00000	00000


		B	Zinc-Plated Steel	17/32"	17/32"	17/32"	3/8"	—	10,000	Ball	3	10595K12	0000	0000


		1/4 NPTF Thread



				B	Zinc-Plated Steel	9/16"	9/16"	9/16"	35/64"	—	10,000	Ball	1	10595K13	0000	0000


				3/8 NPTF Thread



						C	Zinc-Plated Steel	49/64"	31/64"	39/64"	—	3/4"	10,000	Ball	1	10595K21	00000	00000


						3/4 NPTF Thread



								C	Zinc-Plated Steel	7/8"	29/64"	39/64"	—	1 1/16"	10,000	Ball	1	10595K23	00000	00000

Compact Pressure-Relief Valves

Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.

Steel Body—For Grease and Oil

	Inlet							Each
	Pipe Size	Location	Max. Pressure, psi	Relief Port Location	Overall Ht.	Set Pressure		1-9	10-Up
NPTF Male Inlet and Relief Vent



		1/8	Bottom	5	Top	1/2"	1 psi	1093K1	00000	00000


		1/8	Bottom	15	Top	1/2"	7.5 psi	1093K2	0000	0000
		1/8	Bottom	25	Top	1/2"	15 psi	1093K3	0000	0000
		1/8	Bottom	80	Top	17/32"	45 psi	1093K4	0000	0000
		1/8	Bottom	140	Top	9/16"	80 psi	1093K53	0000	0000
		1/8	Bottom	200	Top	1/2"	100 psi	1093K64	0000	0000
		1/8	Bottom	650	Top	1/2"	400 psi	1093K65	0000	0000

Pin-Style Grease Fittings

The pins on these fittings lock with dispensing tips for pin-style fittings to create a tight seal. Their brass bodies resist corrosion. They have a check valve that prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants. They have PTF-SAE and NPTF (Dryseal) threads, which are compatible with NPT threads.

Straight with Male Thread

Brass Body—Brass fittings are more corrosion resistant than zinc-plated steel fittings.

										Each
	Body Material	Pin Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type		1-9	10-Up
1/4 NPTF Thread



		Brass	Zinc-Plated Steel	1 3/32"	17/64"	5/16"	17/32"	8,000	Ball	1089K13	00000	00000

45° Elbow with Male Thread

Image of Product. Front orientation. Grease Fittings. Pin-Style Grease Fittings, 45° Elbow, Male.

Brass Body—Brass fittings are more corrosion resistant than zinc-plated steel fittings.

Zinc-Plated Steel Body—Zinc-plated steel fittings have mild corrosion resistance.

										Each
	Body Material	Pin Material	Overall Ht.	Thread Lg.	Shank Lg.	Hex Size	Max. Pressure, psi	Check Valve Type		1-9	10-Up
1/8 NPTF Thread



		Brass, Zinc-Plated Steel	Zinc-Plated Steel	1 1/2"	7/32"	7/16"	7/16"	8,000	Ball	1089K14	00000	00000

Rigid Grease Gun Nozzles with Dispensing Tip


Style A

These nozzles come with a dispensing tip and have threads on one end for connecting to a grease gun.

		Nozzle		Dispensing Tip				Nozzle Connection
	Style	Lg.	Material	Lg.	Style	Material	Max. Grease Outlet Pressure, psi	Thread Type	Pipe Size	Gender		Each
For Standard Grease Fittings



		A	5 1/2"	Steel	1 9/16"	Straight	Steel	10,000	NPT	1/8	Male	1090K22	000000


		A	6 1/2"	Steel	1 7/16"	Straight	Steel	10,000	NPT	1/8	Male	1090K13	00000
		A	12"	Steel	1 7/16"	Straight	Steel	10,000	NPT	1/8	Male	1090K15	00000
		A	21"	Steel	1 9/16"	Straight	Steel	10,000	NPT	1/8	Male	1090K11	000000

Flexible Grease Gun Nozzles with Dispensing Tip


Straight

These nozzles come with a dispensing tip and have threads on one end for connecting to a grease gun.

	Nozzle		Dispensing Tip				Nozzle Connection
	Lg.	Material	Lg.	Style	Material	Max. Grease Outlet Pressure, psi	Thread Type	Pipe Size	Gender		Each
For Pin-Style Grease Fittings



		12"	Synthetic Rubber	1 1/2"	Straight	Steel	4,800	NPT	1/8	Male	2162K13	000000


		18"	Synthetic Rubber	1 1/2"	Straight	Steel	4,800	NPT	1/8	Male	2162K14	000000