M12 Grease Fittings | McMaster-Carr

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17 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.

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., mm	Thread Lg., mm	Shank Lg., mm	Hex Size, mm	Max. Pressure, psi	Check Valve Type	Specs. Met	Pkg. Qty.		1-9	10-Up
M12 × 1 mm Metric Thread



		Zinc-Plated Steel	18	6.5	6.5	14	10,000	Ball	DIN 71412	10	0000000	000000	000000


		M12 × 1.25 mm Metric Thread



				Zinc-Plated Steel	17.5	6.5	6.5	14	1,450	Ball	DIN 71412	10	00000000	00000	00000


				M12 × 1.5 mm Metric Thread



						Zinc-Plated Steel	18	6.5	6.5	14	10,000	Ball	DIN 71412	5	0000000	00000	00000


						303 Stainless Steel	17.5	6.5	6.5	14	1,450	Ball	DIN 71412	1	0000000	0000	0000


						M12 × 1.75 mm Metric Thread



								Zinc-Plated Steel	17.5	6.5	6.5	14	1,450	Ball	DIN 71412	5	00000000	0000	0000

90° 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
M12 × 1 mm Metric Thread



		Zinc-Plated Steel	22	6.5	6.5	14	10,000	Ball	DIN 71412	5	0000000	000000	00000


		M12 × 1.5 mm Metric Thread



				Zinc-Plated Steel	22	6.5	6.5	14	10,000	Ball	DIN 71412	5	0000000	00000	00000


				M12 × 1.75 mm Metric Thread



						Zinc-Plated Steel	22	6.5	6.5	14	1,450	Ball	DIN 71412	5	00000000	00000	00000

45° 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
M12 × 1 mm Metric Thread



		Zinc-Plated Steel	22.5	6.5	6.5	14	1,450	Ball	DIN 71412	5	00000000	000000	000000


		M12 × 1.5 mm Metric Thread



				Zinc-Plated Steel	23	6.5	6.5	14	10,000	Ball	DIN 71412	5	0000000	00000	0000


				M12 × 1.75 mm Metric Thread



						Zinc-Plated Steel	22.5	6.5	6.5	14	1,450	Ball	DIN 71412	5	00000000	00000	00000

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

Connection
Male	Female	Material		Each



	Metric M12 × 1 mm	NPT 1/8	Steel	00000000	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
M12 × 1 mm Metric Thread



		Zinc-Plated Steel	17	6	6	17	16	1,450	Ball	DIN 3404	0000000	00000	00000


		M12 × 1.5 mm Metric Thread



				Zinc-Plated Steel	17	6	6	17	16	10,000	Ball	DIN 3404	0000000	0000	0000


				303 Stainless Steel	17	6	6	17	16	10,000	Ball	DIN 3404	0000000	00000	00000


				M12 × 1.75 mm Metric Thread



						Zinc-Plated Steel	17	6	6	17	16	1,450	Ball	DIN 3404	0000000	0000	0000

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.

												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
M12 × 1.5 mm Metric Thread



		C	Zinc-Plated Steel	14	9.5	9.5	14	1,450	Ball	DIN 3405	5	00000000	000000	00000