M6 Grease Fittings | McMaster-Carr

Filter by

System of Measurement

Thread Size

Thread Pitch

Thread Type

Shape

For Use With

Grease Fitting Style

Pipe Size

Material

Screw Size

Overall Height

Thread Length

Shank Length

Height

Hex Size

Shank Type

Gender

Maximum Pressure

1,000 psi to 1,999 psi

4,000 psi to 9,999 psi

10,000 psi or greater

Check Valve Type

Ball

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Exempt

RoHS

Compliant

Compliant with Exemptions

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

Export Control Classification Number (ECCN)

Finish

Width

38 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

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.

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

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., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M6 × 0.75 mm Metric Thread



		Zinc-Plated Steel	15	5.5	5.5	7	10,000	Ball	DIN 71412	10	1105K16	00000	00000


		Zinc-Plated Steel	24	6	14	7	10,000	Ball	DIN 71412	5	1095K106	00000	00000
		Brass	15	5.5	5.5	7	1,450	Ball	DIN 71412	5	3088K103	00000	0000
		303 Stainless Steel	15	5.5	5.5	7	10,000	Ball	DIN 71412	1	2250K25	0000	0000


		M6 × 1 mm Metric Thread



				Zinc-Plated Steel	14	5.4	5.4	7	8,000	Ball	DIN 71412	10	1105K71	0000	0000


				Zinc-Plated Steel	17.3	5.6	8.5	7	1,450	Ball	DIN 71412	10	1095K107	0000	0000
				Zinc-Plated Steel	24	6	14	7	10,000	Ball	DIN 71412	10	1105K11	00000	00000
				Zinc-Plated Steel	29	8.3	19	7	10,000	Ball	DIN 71412	5	1105K21	00000	00000
				Zinc-Plated Steel	41	6	31	7	10,000	Ball	DIN 71412	1	1105K31	0000	0000
				Brass	13.5	4	4	7	10,000	Ball	DIN 71412	5	3088K21	0000	0000
				303 Stainless Steel	13	5.2	5.2	7	8,000	Ball	—	3	2250K11	0000	0000
				316 Stainless Steel	15	5.5	5.5	7	1,450	Ball	DIN 71412	1	4315N12	0000	0000

90° Elbow with Male Thread

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.

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

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., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M6 × 0.75 mm Metric Thread



		Zinc-Plated Steel	18	5.5	5.5	9	10,000	Ball	DIN 71412	10	1105K18	000000	000000


		M6 × 1 mm Metric Thread



				Zinc-Plated Steel	18	5.5	5.5	9	8,000	Ball	DIN 71412	10	1105K76	00000	00000


				Brass	18	5.5	5.5	9	10,000	Ball	DIN 71412	5	3088K24	00000	00000
				303 Stainless Steel	18	5.6	5.6	9	8,000	Ball	—	3	2250K13	00000	00000
				316 Stainless Steel	18	5.5	5.5	9	1,450	Ball	DIN 71412	1	4315N18	00000	00000

67° Elbow with Male Thread

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., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M6 × 1 mm Metric Thread



		Zinc-Plated Steel	20.5	5.5	5.5	9	1,450	Ball	DIN 71412	10	1095K133	000000	000000

45° Elbow with Male Thread

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.

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

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., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M6 × 0.75 mm Metric Thread



		Zinc-Plated Steel	23.5	5.5	5.5	9	10,000	Ball	DIN 71412	10	1105K17	000000	000000


		M6 × 1 mm Metric Thread



				Zinc-Plated Steel	23	5.5	5.5	9	8,000	Ball	DIN 71412	10	1105K74	00000	00000


				Brass	23.5	5.5	5.5	9	10,000	Ball	DIN 71412	5	3088K23	00000	00000
				303 Stainless Steel	23	5.6	5.6	9	8,000	Ball	—	3	2250K12	00000	00000
				316 Stainless Steel	23.5	5.5	5.5	9	1,450	Ball	DIN 71412	1	4315N19	00000	00000

90° Wye with Male Thread

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., mm	Thread Lg., mm	Shank Lg., mm	Max. Pressure, psi	Square Size, mm	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M6 × 1 mm Metric Thread



		Zinc-Plated Steel	18	5.5	5.5	1,450	9	Ball	DIN 71412	5	1095K152	000000	000000

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



	Metric M6 × 1 mm	UNF 1/4"-28	Zinc-Plated Steel	9006T21	00000


	Metric M6 × 1 mm	NPT 1/8	Steel	4936K488	00000

Flush-Style Grease Fittings

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 C

Style C—Install Style C with a hex wrench.

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.

												Pkg.
	Style	Material	Overall Ht., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M6 × 0.75 mm Metric Thread



		C	Zinc-Plated Steel	9	6	6	7	1,450	Ball	DIN 3405	5	10595K36	00000	00000


		M6 × 1 mm Metric Thread



				C	Zinc-Plated Steel	9	6	6	7	10,000	Ball	DIN 3405	5	2421K31	0000	0000


				C	303 Stainless Steel	9	6	6	7	1,450	Ball	DIN 3405	1	10595K37	0000	0000

Self-Tapping Grease Fittings for Unthreaded Holes

To fit securely in unthreaded holes, these fittings cut threads as they’re installed. Use a hex wrench to install. Fittings can be driven in, but then are not pressure rated. They're zinc-plated steel for mild corrosion resistance. All have an integral 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. These fittings are also known as hydraulic grease fittings.

Straight with Male Thread

											Pkg.
	For Hole Dia., mm	Material	Overall Ht., mm	Shank Lg., mm	Thread Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
M6 × 1 mm Metric Thread



		5.6 to 5.7	Zinc-Plated Steel	14	5.5	5.5	7	8,000	Ball	10	8742T31	00000	00000


		5.6 to 5.7	Zinc-Plated Steel	15	5.5	5.5	7	10,000	Ball	10	8742T11	0000	0000

90° Elbow with Male Thread

											Pkg.
	For Hole Dia., mm	Material	Overall Ht., mm	Shank Lg., mm	Thread Lg., mm	Square Size, mm	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
M6 × 1 mm Metric Thread



		5.6 to 5.7	Zinc-Plated Steel	18	5.5	5.5	9	10,000	Ball	10	8742T17	000000	000000

45° Elbow with Male Thread

											Pkg.
	For Hole Dia., mm	Material	Overall Ht., mm	Shank Lg., mm	Thread Lg., mm	Square Size, mm	Max. Pressure, psi	Check Valve Type	Pkg. Qty.		1-9	10-Up
M6 × 1 mm Metric Thread



		5.6 to 5.7	Zinc-Plated Steel	20	5.5	5.5	9	10,000	Ball	10	8742T14	000000	000000

Self-Tapping Flush-Style Grease Fittings for Unthreaded Holes

Ensure a secure fit in unthreaded holes—these fittings cut threads as they’re installed. Use them in tight spaces where protruding fittings won't work. Install with a hex wrench. Fittings can be driven in, but then are not pressure rated. They’re zinc-plated steel for mild corrosion resistance. 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.

												Pkg.
	For Hole Dia., mm	Material	Overall Ht., mm	Shank Lg., mm	Thread Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
Straight with Male Thread







				M6 × 1 mm Metric Thread

				5.6 to 5.7	Zinc-Plated Steel	8.5	5.5	5.5	7	10,000	Ball	DIN 3405	5	2421K37	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.

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.

											Each
	Material	Overall Ht., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Head Dia., mm	Max. Pressure, psi	Check Valve Type	Specs. Met		1-9	10-Up
M6 × 1 mm Metric Thread



		Zinc-Plated Steel	14	6	6	11	10	1,450	Ball	DIN 3404	1094K72	00000	00000


		Zinc-Plated Steel	17	6	6	17	16	10,000	Ball	DIN 3404	2443K39	0000	0000
		303 Stainless Steel	17	6	6	17	16	10,000	Ball	DIN 3404	2443K56	00000	0000