McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    8 Products

    Grease Fitting Size Identifiers

    Image of Product. Front orientation. Thread Size Identifiers. 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 Use With
    For Thread Type
    For Thread
    Location
    For Thread Size
    For Screw
    Size
    For Pipe
    Size
    Wd.
    Ht.
    Thk.
    Each
    Inch/Metric
     
    Aluminum
    Grease FittingsNPT, SAE-LT, BSW, UNF, BSPT, BSF, MetricExternal3/16"-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"0000000000000
     

    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
    Image of Product. Front orientation. Grease Fittings. Grease Fittings, Straight, Male.
    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
    3/8"-24 UNF Thread
    Zinc-Plated Steel5/8"1/4"1/4"7/16"8,000Ball1000000000000000000
    Brass19/32"7/32"7/32"7/16"10,000Ball500000000000000000
    303 Stainless Steel19/32"7/32"7/32"7/16"10,000Ball300000000000000000
     
    90° Elbow with Male Thread
    Image of Product. Front orientation. Grease Fittings. Grease Fittings, 90° Elbow, Male.
    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 Steel51/64"7/32"7/32"7/16"1,450Ball100000000000000000000
     
    67° Elbow with Male Thread
    Image of Product. Front orientation. Grease Fittings. Grease Fittings, Male, 67° 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.
    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 Steel63/64"7/32"7/32"7/16"1,450Ball1000000000000000000000
     
    45° Elbow with Male Thread
    Image of Product. Front orientation. Grease Fittings. Grease Fittings, 45° Elbow, Male.
    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 Steel63/64"7/32"7/32"7/16"1,450Ball1000000000000000000000
     

    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, Straight, Male.
    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
    3/8"-24 UNF Thread
    Zinc-Plated Steel5/8"15/64"15/64"19/32"5/8"1,450Ball00000000000000000
     
    back to top