UNF Grease Fittings | McMaster-Carr

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Shape

Thread Type

UN/UNF (SAE Straight)

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Pipe Size

Material

Hex Size

Screw Size

Check Valve Type

Gender

For Use With

Thread Pitch

Height

Thread Length

Overall Height

Shank Type

Shank Length

Dispensing Tip Connection Thread Type

NPT

UNF

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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Compliant with Exemptions

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DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

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

Yes

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132 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

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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

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

303 Stainless Steel—303 stainless steel fittings are more corrosion resistant than brass fittings and have good chemical 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
6-40 UNF Thread



		Zinc-Plated Steel	1/2"	9/64"	9/64"	1/4"	10,000	Without Valve	10	1095K86	00000	00000


		10-32 UNF Thread



				Zinc-Plated Steel	15/32"	7/64"	5/64"	1/4"	10,000	Without Valve	10	1095K87	0000	0000


				Zinc-Plated Steel	1/2"	1/8"	1/8"	1/4"	10,000	Without Valve	10	1095K88	0000	0000


				1/4"-28 UNF Thread



						Zinc-Plated Steel	33/64"	5/32"	5/32"	9/32"	10,000	Ball	10	1095K44	0000	0000


						Brass	17/32"	5/32"	5/32"	9/32"	10,000	Ball	5	3088K3	0000	0000
						Brass	19/32"	7/32"	7/32"	9/32"	10,000	Ball	5	3088K5	0000	0000


						5/16"-24 UNF Thread



								Zinc-Plated Steel	21/32"	5/32"	5/32"	3/8"	10,000	Ball	10	1095K51	0000	0000


								Zinc-Plated Steel	2 61/64"	7/32"	2 35/64"	11/32"	10,000	Ball	3	1095K83	00000	0000
								Brass	19/32"	7/32"	7/32"	11/32"	10,000	Ball	5	3088K11	00000	0000
								303 Stainless Steel	19/32"	7/32"	7/32"	11/32"	10,000	Ball	3	1293K44	00000	00000


								3/8"-24 UNF Thread



										Zinc-Plated Steel	5/8"	1/4"	1/4"	7/16"	8,000	Ball	10	1095K96	0000	0000


										Brass	19/32"	7/32"	7/32"	7/16"	10,000	Ball	5	3088K14	00000	00000
										303 Stainless Steel	19/32"	7/32"	7/32"	7/16"	10,000	Ball	3	1293K47	00000	00000


										1/2"-20 UNF Thread



												Zinc-Plated Steel	11/16"	1/4"	1/4"	9/16"	1,450	Ball	10	1095K101	00000	00000

90° Elbow with Male Thread

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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

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

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
1/4"-28 UNF Thread



		Brass	45/64"	7/32"	7/32"	11/32"	10,000	Ball	3	3088K9	000000	000000


		5/16"-24 UNF Thread



				Zinc-Plated Steel	23/32"	5/32"	13/64"	23/64"	8,000	Ball	10	1095K157	0000	0000


				3/8"-24 UNF Thread



						Zinc-Plated Steel	49/64"	7/32"	7/32"	7/16"	1,450	Ball	10	1095K118	00000	0000


						1/2"-20 UNF Thread



								Zinc-Plated Steel	55/64"	1/4"	1/4"	9/16"	1,450	Ball	3	1095K119	00000	00000

67° Elbow with Male Thread

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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"-24 UNF Thread



		Zinc-Plated Steel	63/64"	7/32"	7/32"	7/16"	1,450	Ball	10	1095K132	000000	000000

45° Elbow with Male Thread

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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

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

303 Stainless Steel—303 stainless steel fittings are more corrosion resistant than brass fittings and have good chemical 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
1/4"-28 UNF Thread



		Zinc-Plated Steel	39/64"	7/64"	1/8"	3/8"	10,000	Ball	10	1095K74	000000	00000


		Brass	59/64"	7/32"	7/32"	11/32"	10,000	Ball	1	3088K7	0000	0000


		5/16"-24 UNF Thread



				Zinc-Plated Steel	59/64"	7/32"	7/32"	11/32"	1,450	Ball	10	1095K137	00000	0000


				Brass	59/64"	7/32"	7/32"	11/32"	10,000	Ball	3	3088K12	00000	00000
				303 Stainless Steel	59/64"	7/32"	7/32"	11/32"	10,000	Ball	1	1293K45	00000	00000


				3/8"-24 UNF Thread



						Zinc-Plated Steel	63/64"	7/32"	7/32"	7/16"	1,450	Ball	10	1095K138	00000	00000


						1/2"-20 UNF Thread



								Zinc-Plated Steel	57/64"	1/4"	1/4"	9/16"	1,450	Ball	5	1095K139	00000	00000

Grease Fitting Size Identifiers

Take the guesswork out of determining the thread type and size of a grease fitting. Screw the shank of a grease fitting into the labeled holes of these identifiers until you find the one that fits.

	For Thread Size	For Screw Size	For Pipe Size	Wd.	Ht.	Thk.		Each
Inch/Metric







	Aluminum

	Grease Fittings	NPT, SAE-LT, BSW, UNF, BSPT, BSF, Metric	External	3/16"-32, 1/4"-20, 1/4"-26, 1/4"-28, 5/16"-18, 5/16"-22, 5/16"-24, 3/8"-20, 3/8"-24, 1/2"-12, M6 × 0.75 mm, M6 × 1 mm, M8 × 1 mm, M8 × 1.25 mm, M10 × 1 mm, M10 × 1.5 mm	1/8", 1/4"	1/8, 1/4, 3/8	8 1/2"	3"	1/4"	6672N11	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

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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

Connection
Male	Female	Material		Each



	UNF 1/4"-28	NPT 1/8	Steel	1303K21	00000


	Metric M6 × 1 mm	UNF 1/4"-28	Zinc-Plated Steel	9006T21	0000
	Metric M8 × 1 mm	UNF 1/4"-28	Zinc-Plated Steel	9006T22	0000
	Metric M10 × 1 mm	UNF 1/4"-28	Zinc-Plated Steel	9006T23	0000

65° Elbow

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

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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

Connection
Male	Female	Material	Pkg. Qty.		Pkg.



	SAE-LT 1/4"-28	UNF 1/4"-28	Zinc-Plated Steel	5	9006T37	00000

45° Elbow

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

Connection
Male	Female	Material		Each



	UNF 1/4"-28	NPT 1/8	Steel	1303K22	000000

Flush-Style Grease Fittings


Male Straight Style A	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 C

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

Style A—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
10-32 UNF Thread



		A	Zinc-Plated Steel	23/64"	3/16"	7/32"	1/4"	—	8,000	Ball	5	10595K331	00000	00000


		1/4"-28 UNF Thread



				C	Zinc-Plated Steel	13/32"	19/64"	19/64"	—	5/16"	10,000	Ball	5	10595K14	0000	0000

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.

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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
1/4"-28 UNF Thread



		Zinc-Plated Steel	5/8"	15/64"	15/64"	19/32"	5/8"	1,450	Ball	1094K37	00000	00000


		3/8"-24 UNF Thread



				Zinc-Plated Steel	5/8"	15/64"	15/64"	19/32"	5/8"	1,450	Ball	1094K38	0000	0000

Precision Grease-Dispensing Tips


45° Angle	90° Angle	Straight

Penetrate gaskets, sealed bearings, and joints to deliver grease to precise locations. Attach dispensing tips to nozzles.

	Tips																Replacement Needles
	Dispensing Tip			Needle		Dispensing Tip Connection			Needle Connection			Each		Package
	Style	Lg.	Material	Lg.	Material	Thread Type	Pipe Size	Gender	Thread Type	Thread Size	Gender		Each	Pkg. Qty.		Pkg.		Each
0.035" OD Needle (20 Gauge)



		45° Angle	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K914	00000	5	10475K934	000000	10475K214	00000


		90° Angle	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K924	0000	5	10475K944	00000	10475K314	0000
		Straight	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K814	0000	5	10475K854	00000	10475K114	0000
		Straight	1 13/16"	Brass	3/4"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K824	0000	5	10475K864	00000	10475K124	0000
		Straight	2 1/16"	Brass	1"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K834	0000	5	10475K874	00000	10475K134	0000
		Straight	3 1/16"	Brass	2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K844	0000	5	10475K884	00000	10475K144	0000


		0.05" OD Needle (18 Gauge)



				45° Angle	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K912	0000	5	10475K932	00000	10475K212	0000


				90° Angle	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K922	0000	5	10475K942	00000	10475K312	0000
				Straight	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K812	0000	5	10475K852	00000	10475K112	0000
				Straight	1 13/16"	Brass	3/4"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K822	0000	5	10475K862	00000	10475K122	0000
				Straight	2 1/16"	Brass	1"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K832	0000	5	10475K872	00000	10475K132	0000
				Straight	3 1/16"	Brass	2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K842	0000	5	10475K882	00000	10475K142	0000


				0.058" OD Needle (17 Gauge)



						45° Angle	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K911	0000	5	10475K931	00000	10475K211	0000


						90° Angle	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K921	0000	5	10475K941	00000	10475K311	0000
						Straight	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K811	0000	5	10475K851	00000	10475K111	0000
						Straight	1 13/16"	Brass	3/4"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K821	0000	5	10475K861	00000	10475K121	0000
						Straight	2 1/16"	Brass	1"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K831	0000	5	10475K871	00000	10475K131	0000
						Straight	3 1/16"	Brass	2"	Stainless Steel	NPT	1/8	Female	UNF	1/4"-28	Female	10475K841	0000	5	10475K881	00000	10475K141	0000

Replacement Thread Adapters

		Each
Fitting	10475K52	00000

Grease Fitting Repair Tools for Threaded Holes

Remove worn fittings and repair threaded holes.

For Grease Fitting
Thread Type	Thread Size	Shape	Material	Lg.		Each
UNF	1/4"-28	Straight, Elbow	Steel	1 3/4"	2906K98	00000

Grease Gun Nozzles with Precision Dispensing Tip


45° Angle	90° Angle	Straight

Penetrate gaskets, sealed bearings, and joints to deliver grease to precise locations. Nozzles thread directly into a grease gun.

	Nozzles																	Replacement Needles
	Dispensing Tip		Nozzle		Needle		Nozzle Connection			Dispensing Tip Connection			Each		Package
	Style	Material	Lg.	Material	Lg.	Material	Thread Type	Pipe Size	Gender	Thread Type	Thread Size	Gender		Each	Pkg. Qty.		Pkg.		Each
0.035" OD Needle (20 Gauge)



		45° Angle	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K714	00000	5	10475K734	000000	10475K214	00000


		90° Angle	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K724	0000	5	10475K744	00000	10475K314	0000
		Straight	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K614	0000	5	10475K654	00000	10475K114	0000
		Straight	Brass	1 13/16"	Brass	3/4"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K624	0000	5	10475K664	00000	10475K124	0000
		Straight	Brass	2 1/16"	Brass	1"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K634	0000	5	10475K674	00000	10475K134	0000
		Straight	Brass	3 1/16"	Brass	2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K644	0000	5	10475K684	00000	10475K144	0000


		0.05" OD Needle (18 Gauge)



				45° Angle	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K712	0000	5	10475K732	00000	10475K212	0000


				90° Angle	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K722	0000	5	10475K742	00000	10475K312	0000
				Straight	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K612	0000	5	10475K652	00000	10475K112	0000
				Straight	Brass	1 13/16"	Brass	3/4"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K622	0000	5	10475K662	00000	10475K122	0000
				Straight	Brass	2 1/16"	Brass	1"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K632	0000	5	10475K672	00000	10475K132	0000
				Straight	Brass	3 1/16"	Brass	2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K642	0000	5	10475K682	00000	10475K142	0000


				0.058" OD Needle (17 Gauge)



						45° Angle	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K711	0000	5	10475K731	00000	10475K211	0000


						90° Angle	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K721	0000	5	10475K741	00000	10475K311	0000
						Straight	Brass	1 9/16"	Brass	1/2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K611	0000	5	10475K651	00000	10475K111	0000
						Straight	Brass	1 13/16"	Brass	3/4"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K621	0000	5	10475K661	00000	10475K121	0000
						Straight	Brass	2 1/16"	Brass	1"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K631	0000	5	10475K671	00000	10475K131	0000
						Straight	Brass	3 1/16"	Brass	2"	Stainless Steel	NPT	1/8	Male	UNF	1/4"-28	Female	10475K641	0000	5	10475K681	00000	10475K141	0000

Replacement Tip Adapters

		Each
Replacement Nozzle	10475K51	00000

Oil Fittings

Note: Fittings do not hold oil; any oil dispensed into the fittings passes into the part to be lubricated.

90° Elbow with Self-Closing Hinged Cover

Image of Product. Front orientation. Contains Annotated. Oil Fittings. Oil Fittings, Self-Closing Hinged Cover, 90° Elbow.

Image of Attribute. Back orientation. Contains Annotated. Oil Fittings, Self-Closing Hinged Cover, 90° Elbow.

Fittings with a self-closing hinged cover block contaminants from entering equipment.

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

Zinc—Zinc alloy fittings have mild corrosion resistance.

							Each
	Material	Overall Ht.	Shank Lg.	Thread Lg.	Installation Clearance		1-9	10-Up
10-32 Male UNF Thread



		Zinc	19/32"	5/32"	5/32"	1 1/16"	1227K11	000000	000000

Straight with Self-Closing Hinged Cover


Male

Fittings with a self-closing hinged cover block contaminants from entering equipment.

UNF Thread—UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.

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

							Each
	Material	Overall Ht.	Shank Lg.	Thread Lg.	Installation Clearance		1-9	10-Up
10-32 Male UNF Thread



		Zinc-Plated Steel	9/16"	3/16"	3/16"	3/4"	1229K12	000000	000000