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)
    100 Products

    Partially Grooved Dowel Pins with Notch

    Slip a spring into the notch at the end of the pin. Often used in automated machinery such as conveyors and robotic arms, the pin anchors the spring in place to create tension between components. The grooved section pinches shut when installed to lock the pin in place. Grooved pins have a tighter fit than standard dowel pins and resist pulling from movement and vibration.
    For the best fit, drill your hole slightly larger than the nominal diameter shown.
    Half Grooved
    Image of ProductInUse. Front orientation. Dowel Pins. Partially Grooved, Standard Tolerance, Notch Head, Half Grooved.
    Image of Product. Front orientation. Dowel Pins. Partially Grooved, Standard Tolerance, Notch Head, Half Grooved.
    Also known as type G pins.
    Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.
    Parallel Groove—Fit tighter than pins with tapered grooves to stay in place under severe vibration. However, they require more force to insert.
    Nominal
    Max.
    Lg.
    Dia.
    Dia.
    Tolerance
    Dia.
    Dia. Tolerance
    Groove
    Type
    Double Shear Breaking
    Strength, lbf
    Min.
    Hardness
    Groove
    Lg.
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Carbon Steel
     
    3/32" Diameter
    1/4"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/8"25000000000000000
    1/2"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/4"2500000000000000
     
    1/8" Diameter
    1/2"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated1/4"2500000000000000
    3/4"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated3/8"2500000000000000
    1"0.125"-0.002" to 0"0.133"-0.003" to 0.003"Parallel1,600Not Rated1/2"2500000000000000
     
    5/32" Diameter
    1/2"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated1/4"2500000000000000
    3/4"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated3/8"2500000000000000
    1"0.156"-0.002" to 0"0.165"-0.003" to 0.003"Parallel2,300Not Rated1/2"2500000000000000
     
    3/16" Diameter
    1/2"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/4"2500000000000000
    3/4"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated3/8"2500000000000000
    1"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/2"100000000000000
    1 1/2"0.188"-0.002" to 0"0.197"-0.003" to 0.003"Parallel3,300Not Rated3/4"1000000000000000
     
    1/4" Diameter
    3/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated3/8"2500000000000000
    1"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated1/2"2500000000000000
    1 1/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated5/8"100000000000000
    1 1/2"0.25"-0.002" to 0"0.262"-0.003" to 0.003"Parallel5,800Not Rated3/4"1000000000000000
     
    5/16" Diameter
    3/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated3/8"100000000000000
    1"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated1/2"100000000000000
    1 1/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated5/8"100000000000000
     
    3/8" Diameter
    1"0.375"-0.002" to 0"0.394"-0.003" to 0.003"Parallel11,000Not Rated1/2"1000000000000000
     

    Fully Grooved Dowel Pins

    With a tighter fit than standard dowel pins, these resist pulling from movement and vibration, even in imperfect holes. Three grooves pinch shut when installed, creating tension to lock in place. Also known as Type A pins.
    For the best fit, drill your hole slightly larger than the nominal diameter shown.
    Steel
    Image of Product. Front orientation. Dowel Pins. Plain Head, Standard Tolerance, Fully Grooved, Tapered Groove.

    Tapered Groove

    Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.
    Tapered Groove—Easier to install than pins with parallel grooves but less secure in high-vibration applications.
    Nominal
    Max.
    Lg.
    Dia.
    Dia.
    Tolerance
    Dia.
    Dia. Tolerance
    Groove
    Type
    Double Shear Breaking
    Strength, lbf
    Min.
    Hardness
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Carbon Steel
     
    3/32" Diameter
    1/4"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Tapered850Not Rated25000000000000000
    1/2"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Tapered850Not Rated2500000000000000
     
    1/8" Diameter
    1/2"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Tapered1,600Not Rated2500000000000000
    3/4"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Tapered1,600Not Rated2500000000000000
    1"0.125"-0.002" to 0"0.133"-0.003" to 0.003"Tapered1,600Not Rated2500000000000000
     
    5/32" Diameter
    1/2"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Tapered2,300Not Rated2500000000000000
    3/4"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Tapered2,300Not Rated2500000000000000
    1"0.156"-0.002" to 0"0.165"-0.003" to 0.003"Tapered2,300Not Rated2500000000000000
     
    3/16" Diameter
    1/2"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Tapered3,300Not Rated2500000000000000
    3/4"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Tapered3,300Not Rated2500000000000000
    1"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Tapered3,300Not Rated100000000000000
    1 1/2"0.188"-0.002" to 0"0.197"-0.003" to 0.003"Tapered3,300Not Rated1000000000000000
     
    1/4" Diameter
    3/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Tapered5,800Not Rated2500000000000000
    1"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Tapered5,800Not Rated2500000000000000
    1 1/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Tapered5,800Not Rated100000000000000
    1 1/2"0.25"-0.002" to 0"0.262"-0.003" to 0.003"Tapered5,800Not Rated1000000000000000
     
    5/16" Diameter
    3/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Tapered7,600Not Rated100000000000000
    1"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Tapered7,600Not Rated100000000000000
    1 1/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Tapered7,600Not Rated100000000000000
     
    3/8" Diameter
    1"0.375"-0.002" to 0"0.394"-0.003" to 0.003"Tapered11,000Not Rated1000000000000000
     

    Partially Grooved Dowel Pins

    The grooved section secures these pins while the smooth portion is free to act as a pivot or hinge. The grooves pinch shut when installed, creating tension to lock in place. They fit tighter than standard dowel pins and resist pulling from movement and vibration, even in imperfect holes.
    For the best fit, drill your hole slightly larger than the nominal diameter shown.
    Half Grooved
    Image of ProductInUse. Front orientation. Dowel Pins. Plain Head, Standard Tolerance, Partially Grooved, Half Grooved.
    Image of Product. Back orientation. Dowel Pins. Plain Head, Standard Tolerance, Partially Grooved, Half Grooved, Parallel Groove.

    Parallel Groove

    The most versatile partially grooved pins, these are used in a range of applications, including as rod end linkages, stop pins, and locators. Also known as type H pins.
    Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.
    Parallel Groove—Fit tighter than pins with tapered grooves to stay in place under severe vibration. However, they require more force to insert.
    Nominal
    Max.
    Lg.
    Dia.
    Dia.
    Tolerance
    Dia.
    Dia. Tolerance
    Groove
    Type
    Double Shear Breaking
    Strength, lbf
    Min.
    Hardness
    Groove
    Lg.
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Carbon Steel
     
    3/32" Diameter
    1/4"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/8"25000000000000000
    1/2"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/4"2500000000000000
     
    1/8" Diameter
    1/2"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated1/4"2500000000000000
    3/4"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated3/8"2500000000000000
    1"0.125"-0.002" to 0"0.133"-0.003" to 0.003"Parallel1,600Not Rated1/2"2500000000000000
     
    5/32" Diameter
    1/2"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated1/4"2500000000000000
    3/4"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated3/8"2500000000000000
    1"0.156"-0.002" to 0"0.165"-0.003" to 0.003"Parallel2,300Not Rated1/2"2500000000000000
     
    3/16" Diameter
    1/2"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/4"2500000000000000
    3/4"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated3/8"2500000000000000
    1"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/2"100000000000000
    1 1/2"0.188"-0.002" to 0"0.197"-0.003" to 0.003"Parallel3,300Not Rated3/4"1000000000000000
     
    1/4" Diameter
    3/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated3/8"2500000000000000
    1"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated1/2"2500000000000000
    1 1/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated5/8"100000000000000
    1 1/2"0.25"-0.002" to 0"0.262"-0.003" to 0.003"Parallel5,800Not Rated3/4"1000000000000000
     
    5/16" Diameter
    3/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated3/8"100000000000000
    1"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated1/2"100000000000000
    1 1/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated5/8"100000000000000
     
    3/8" Diameter
    1"0.375"-0.002" to 0"0.394"-0.003" to 0.003"Parallel11,000Not Rated1/2"1000000000000000
     
    Center Grooved
    Image of ProductInUse. Front orientation. Dowel Pins. Plain Head, Standard Tolerance, Partially Grooved, Center Grooved.
    Image of Product. Front orientation. Dowel Pins. Plain Head, Standard Tolerance, Partially Grooved, Center Grooved, Parallel Groove.

    Parallel Groove

    These pins lock in the middle, leaving two smooth ends free. They're often used to create a T-handle, such as on a valve stem to open and close it by hand. Also known as type E pins.
    Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.
    Parallel Groove—Fit tighter than pins with tapered grooves to stay in place under severe vibration. However, they require more force to insert.
    Nominal
    Max.
    Lg.
    Dia.
    Dia.
    Tolerance
    Dia.
    Dia. Tolerance
    Groove
    Type
    Double Shear Breaking
    Strength, lbf
    Min.
    Hardness
    Groove
    Lg.
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Carbon Steel
     
    3/32" Diameter
    1/4"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/8"25000000000000000
    1/2"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/4"2500000000000000
     
    1/8" Diameter
    1/2"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated1/4"2500000000000000
    3/4"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated3/8"2500000000000000
    1"0.125"-0.002" to 0"0.133"-0.003" to 0.003"Parallel1,600Not Rated1/2"2500000000000000
     
    5/32" Diameter
    1/2"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated1/4"2500000000000000
    3/4"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated3/8"2500000000000000
    1"0.156"-0.002" to 0"0.165"-0.003" to 0.003"Parallel2,300Not Rated1/2"2500000000000000
     
    3/16" Diameter
    1/2"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/4"2500000000000000
    3/4"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated3/8"2500000000000000
    1"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/2"100000000000000
    1 1/2"0.188"-0.002" to 0"0.197"-0.003" to 0.003"Parallel3,300Not Rated3/4"1000000000000000
     
    1/4" Diameter
    3/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated3/8"2500000000000000
    1"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated1/2"2500000000000000
    1 1/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated5/8"100000000000000
    1 1/2"0.25"-0.002" to 0"0.262"-0.003" to 0.003"Parallel5,800Not Rated3/4"1000000000000000
     
    5/16" Diameter
    3/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated3/8"100000000000000
    1"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated1/2"100000000000000
    1 1/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated5/8"100000000000000
     
    3/8" Diameter
    1"0.375"-0.002" to 0"0.394"-0.003" to 0.003"Parallel11,000Not Rated1/2"1000000000000000
     
    Quarter Grooved
    Image of ProductInUse. Front orientation. Dowel Pins. Plain Head, Standard Tolerance, Partially Grooved, Quarter Grooved.
    Image of Product. Front orientation. Dowel Pins. Plain Head, Standard Tolerance, Partially Grooved, Quarter Grooved, Parallel Groove.

    Parallel

    Groove

    With a longer smooth end than half-grooved dowel pins, these are often used for thicker pivoting parts, such as levers and hinges. Also known as type C pins.
    Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.
    Parallel Groove—Fit tighter than pins with tapered grooves to stay in place under severe vibration. However, they require more force to insert.
    Nominal
    Max.
    Lg.
    Dia.
    Dia.
    Tolerance
    Dia.
    Dia. Tolerance
    Groove
    Type
    Double Shear Breaking
    Strength, lbf
    Min.
    Hardness
    Groove
    Lg.
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Carbon Steel
     
    3/32" Diameter
    1/4"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/16"25000000000000000
    1/2"0.094"-0.002" to 0"0.101"-0.003" to 0.003"Parallel850Not Rated1/8"2500000000000000
     
    1/8" Diameter
    1/2"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated1/8"2500000000000000
    3/4"0.125"-0.002" to 0"0.134"-0.003" to 0.003"Parallel1,600Not Rated3/16"2500000000000000
    1"0.125"-0.002" to 0"0.133"-0.003" to 0.003"Parallel1,600Not Rated1/4"2500000000000000
     
    5/32" Diameter
    1/2"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated1/8"2500000000000000
    3/4"0.156"-0.002" to 0"0.166"-0.003" to 0.003"Parallel2,300Not Rated3/16"2500000000000000
    1"0.156"-0.002" to 0"0.165"-0.003" to 0.003"Parallel2,300Not Rated1/4"2500000000000000
     
    3/16" Diameter
    1/2"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/8"2500000000000000
    3/4"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated3/16"2500000000000000
    1"0.188"-0.002" to 0"0.198"-0.003" to 0.003"Parallel3,300Not Rated1/4"100000000000000
    1 1/2"0.188"-0.002" to 0"0.197"-0.003" to 0.003"Parallel3,300Not Rated3/8"1000000000000000
     
    1/4" Diameter
    3/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated3/16"2500000000000000
    1"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated1/4"2500000000000000
    1 1/4"0.25"-0.002" to 0"0.263"-0.003" to 0.003"Parallel5,800Not Rated5/16"100000000000000
    1 1/2"0.25"-0.002" to 0"0.262"-0.003" to 0.003"Parallel5,800Not Rated3/8"1000000000000000
     
    5/16" Diameter
    3/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated3/16"100000000000000
    1"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated1/4"100000000000000
    1 1/4"0.313"-0.002" to 0"0.329"-0.003" to 0.003"Parallel7,600Not Rated5/16"100000000000000
     
    3/8" Diameter
    1"0.375"-0.002" to 0"0.394"-0.003" to 0.003"Parallel11,000Not Rated1/4"1000000000000000
     
    back to top