McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Size
    Industrial Info Compare
    Thread Spacing
    Industrial Info Snippet
    Tip Type
    Fastener Head Type
    Industrial Info Compare
    Threaded Insert Type
    Drive Size
    Attribute Image
    Tip Diameter
    Head Diameter
    Attribute Image
    Thread Direction
    Thread Type
    Drive Style
    Industrial Info Snippet
    Thumb Screw Head Profile
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Tip Material
    Head Height
    Attribute Image
    Drill Bit Size
    Attribute Image
    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)
    17 Products

    Precision-Adjust Stainless Steel Ball-Tip Set Screws

    Image of Product. Front orientation. Set Screws. Precision-Adjust Stainless Steel Ball-Tip Set Screws.
    These set screws make the finest adjustments of any we sell. With ultra-fine threads, these screws are found on measuring devices and photonic equipment, where minute adjustments and tight tolerances are critical. They also fine-tune sensors on automated equipment and ensure repeatable positioning on jigs and fixtures. Generally used in dry, controlled environments, the alloy steel tip can oxidize in wet or outdoor environments.
    Lg.
    Tip
    Dia.
    Drive
    Size
    Ball
    Movement
    Hardness
    Each
    18-8 Stainless Steel with Alloy Steel Tip
     
    3/16"-100
    3/8"0.156"3/32"FixedNot Rated98625A11000000
    1/2"0.156"3/32"FixedNot Rated98625A1300000
    3/4"0.156"3/32"FixedNot Rated98625A16000000
    1"0.156"3/32"FixedNot Rated98625A19000000
    1 1/4"0.156"3/32"FixedNot Rated98625A22000000
    1 1/2"0.156"3/32"FixedNot Rated98625A23000000
    1 3/4"0.156"3/32"FixedNot Rated98625A25000000
    2"0.156"3/32"FixedNot Rated98625A28000000
     
    Threaded Inserts
    Install these inserts with ultra-fine threads into unthreaded holes to create a secure mounting point for your precision-adjust set screws.
    Flange
    Installed
    Lg.
    Dia.
    Thk.
    For Max.
    Hole Dia.
    Drill Bit
    Size
    Each
    Brass
     
    3/16"-100
    0.313"0.29"0.01"0.250"1/4"
    		98625A32000000
    0.438"0.29"0.01"0.250"1/4"
    		98625A3300000
    0.625"0.29"0.01"0.250"1/4"
    		98625A3400000
    0.750"0.29"0.01"0.250"1/4"
    		98625A3500000
     

    Ultra-Fine-Thread Press-In Threaded Inserts For Plastic

    Image of Product. Bottom orientation. Threaded Inserts. Ultra-Fine-Thread Press-In Threaded Inserts For Plastic.
    Transform an existing hole in plastic into a precision adjustment point. These inserts mate with ultra-fine-threaded screws for machining setups and other equipment where accuracy matters. Install in a drilled hole using an arbor press or similar pressure tool, and friction keeps inserts in place.
    Flanged Profile—Flanges on the insert create a load-bearing surface that prevents cracks or deformation in the base material. They also curb overtightening and keep inserts from getting pulled out or through.
    Brass—Conductive and nonmagnetic, these inserts are useful for electrical applications. They resist moisture but aren't as strong as steel inserts.
    Flange
    Thread
    Size
    Installed
    Lg.
    Dia.
    Thick.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Each
    Flanged Profile
     
    Brass
    3/16"-100
    		0.313"0.29"0.01"1/4"
    		0.250"98625A32000000
    3/16"-100
    		0.438"0.29"0.01"1/4"
    		0.250"98625A3300000
    3/16"-100
    		0.625"0.29"0.01"1/4"
    		0.250"98625A3400000
    3/16"-100
    		0.750"0.29"0.01"1/4"
    		0.250"98625A3500000
     

    Precision-Adjust Ball-Tip Thumb Screws

    Image of Product. Back orientation. Thumb Screws. Precision-Adjust Ball-Tip Thumb Screws.
    Make precise adjustments where tight tolerances are critical. With ultra-fine threads, these thumb screws are often found on measuring devices and photonic equipment. The rolling ball tip maintains contact and swivels 360° so you can make adjustments without loosening the screw. The narrow width of the head allows these thumb screws to fit in spaces with limited clearance. The knurled texture creates extra grip as you twist. These thumb screws combine the strength of stainless steel with a lightweight plastic head that won’t rust.
    Length is measured from under the head.
    18-8 Stainless Steel with Acetal Head—With a stainless steel body and an acetal head, these screws resist moisture and are chemical resistant.
    Head
    Lg.
    Dia.
    Ht.
    Color
    Tip
    Dia.
    Threading
    Tensile Strength,
    psi
    Each
    18-8 Stainless Steel with Acetal Head
     
    3/16"-100
    3/4"3/8"7/16"Black1/8"Fully Threaded60,00097424A110000000
    1"3/8"7/16"Black1/8"Fully Threaded60,00097424A14000000
    1 1/4"3/8"7/16"Black1/8"Fully Threaded60,00097424A17000000
    1 1/2"3/8"7/16"Black1/8"Fully Threaded60,00097424A20000000
    1 3/4"3/8"7/16"Black1/8"Fully Threaded60,00097424A23000000
     
    Threaded Inserts
    Image of Product. Front orientation. Threaded Inserts.
    Install in unthreaded holes to create a secure mounting point for your precision-adjust thumb screws.
    Flange
    Installed
    Lg.
    Dia.
    Thk.
    For Max.
    Hole Dia.
    Drill Bit
    Size
    Each
    Brass
     
    3/16"-100
    0.313"0.29"0.01"0.250"1/4"
    		98625A32000000
    0.438"0.29"0.01"0.250"1/4"
    		98625A3300000
    0.625"0.29"0.01"0.250"1/4"
    		98625A3400000
    0.750"0.29"0.01"0.250"1/4"
    		98625A3500000
     
    back to top