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.
Zinc-plated steel fittings have mild corrosion resistance. Brass fittings resist corrosion better than zinc-plated steel fittings. 303 stainless steel fittings are more corrosion resistant than brass fittings and have good chemical resistance.
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.
UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.
For technical drawings and 3-D models, click on a part number.
Male
Threads
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 Threads | ||||||||||
| Zinc-Plated Steel | 51/64" | 7/32" | 7/32" | 7/16" | 1,450 | Ball | 10 | 00000000 | 00000 | 00000 |
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 Threads | ||||||||||
| Zinc-Plated Steel | 63/64" | 7/32" | 7/32" | 7/16" | 1,450 | Ball | 10 | 00000000 | 000000 | 000000 |
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 Threads | ||||||||||
| Zinc-Plated Steel | 63/64" | 7/32" | 7/32" | 7/16" | 1,450 | Ball | 10 | 00000000 | 000000 | 00000 |
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.
Zinc-plated steel fittings have mild corrosion resistance. UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.
For technical drawings and 3-D models, click on a part number.
Each | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Material | Overall Ht. | Thread Lg. | Shank Lg. | Hex Size | Head Dia. | Max. Pressure, psi | Check Valve Type | 1-9 | 10-Up | |
3/8"-24 UNF Threads | ||||||||||
| Zinc-Plated Steel | 5/8" | 15/64" | 15/64" | 19/32" | 5/8" | 1,450 | Ball | 0000000 | 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 Type | For Thread Location | For Thread Size  | For Screw Size | For Pipe Size | Wd. | Ht. | Thick. | Each | |
Inch, Metric | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Aluminum | |||||||||
| 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" | 0000000 | 000000 |