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)
    17 Products

    Bearing Locknuts

    Image of System. Front orientation. Contains Annotated. Bearing Nuts. Bearing Locknuts.
    Image of Product. Carbon Steel. Front orientation. Bearing Nuts. Bearing Locknuts, Chamfered Face, Carbon Steel.

    Carbon Steel

    With a nylon insert that grips your threaded shaft or spindle without damaging its threads, these locknuts—also called shaft nuts—hold bearings, bushings, gears, and pulleys prone to vibration tightly in place. They come as one piece, so you can easily clamp them onto your shaft or spindle. But, since they aren’t made entirely of metal, they don’t stand up to heat as well as all-metal locknuts. Slots in their sides mean you can tighten and loosen them with a spanner wrench or spanner socket. Their face is also chamfered to help keep the size and weight of your assembly at a minimum. All meet international standards for bearing locknut dimensions.
    Zinc-Plated Carbon Steel—Zinc-plated carbon steel locknuts resist rusting from some moisture, but you shouldn’t use them with salt water or chemicals. They are strong and resist wear, though they don’t stand up to corrosion as well as 303 stainless steel locknuts.
    Carbon Steel—All carbon steel locknuts are strong and resist wear, though they don’t stand up to corrosion as well as 303 stainless steel locknuts.
    303 Stainless Steel—303 stainless steel locknuts resist corrosion better than carbon steel locknuts but aren’t as strong. They withstand washdowns and chemicals.
    Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.
    Locknuts
    Sockets
    Thread
    Carbon Steel
    Zinc-Plated
    Carbon Steel
    303
    Stainless Steel
    Size
    Spacing
    OD,
    mm
    Wd.,
    mm
    Insert Max.
    Temp., ° F
    Specs.
    Met
    Each
    Each
    Each
    Each
    Chamfered Face
    M12 × 1 mmExtra Fine
    		217.5210————03552N14000000———0———0
    M12 × 1 mmExtra Fine
    		228160ISO 2982-26343K33000000———06343K950000005510N1450000000
    M12 × 1.5 mmFine
    		219210————03552N1500000———0———0
     

    Bearing Nuts

    Image of Product. Front orientation. Bearing Nuts. Bearing Nuts, Carbon Steel, Chamfered Face.

    Carbon Steel

    Chamfered Face

    Image of Product. Front orientation. Bearing Nuts. Bearing Nuts, Carbon Steel, Stepped Face.

    Carbon Steel

    Stepped Face

    Often paired with spring lock washers to strengthen their hold, these bearing nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket.
    Carbon Steel—Carbon steel bearing nuts are strong and resist wear.
    Chamfered Face—Chamfered-face bearing nuts weigh less and produce less heat than stepped-face nuts.
    Stepped Face—Use stepped-face bearing nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.
    ISO 2982— Some chamfered-face bearing nuts meet ISO 2982 (formerly DIN 981), an international standard for bearing locknut dimensions. Their sizes correspond to SKF KM series. Use them with DIN 5406 spring lock washers.
    Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.
    Nuts
    Bearing
    Lock Washers
    Sockets
    Thread
    Size
    Spacing
    OD,
    mm
    Wd.,
    mm
    Specs. Met
    For Lock Washer
    Specs. Met
    Each
    Each
    Each
    Carbon Steel
     
    Chamfered Face
    M12 × 1 mmExtra Fine
    		224DIN 981, ISO 2982DIN 54063554N120000090391A112000005510N1760000000
     
    Stepped Face
    M12 × 1.5 mmFine
    		286DIN 1804DIN 4623564N12000090407A1130000———0
     

    Thin-Profile Bearing Nuts

    Image of System. Front orientation. Contains Annotated. Bearing Nuts. Thin-Profile Bearing Nuts.
    Image of Product. Front orientation. Bearing Nuts. Thin-Profile Bearing Nuts.
    Used in pairs or with another bearing nut, these thin-profile nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle. Threading two nuts tightly against each other makes it harder for vibration to loosen your assembly than if you used only one nut. For the nut closer to the bearing, position the stepped face towards the bearing. These thin-profile nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. All meet DIN 1816, an international standard for bearing locknut dimensions.
    Carbon Steel—Carbon steel bearing nuts are strong and resist wear.
    Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.
    Thread
    Size
    Spacing
    OD,
    mm
    Wd.,
    mm
    Specs.
    Met
    Each
    Carbon Steel
     
    Stepped Face
    M12 × 1.5 mmFine
    		286DIN 18163549N12000000
     

    Fast-Travel Ball Screws and Nuts

    Image of ProductInUse. Front orientation. Contains Inset. Ball Screws and Nuts. Fast-Travel Ball Screws and Nuts.
    Image of Product. Front orientation. Contains Annotated. Ball Screws and Nuts. Fast-Travel Ball Screws and Nuts, Ball Nuts, Externally Threaded Nut, Style A.
    Image of Product. Front orientation. Contains Annotated. Ball Screws and Nuts. Fast-Travel Ball Screws and Nuts, Ball Nuts, Flange Nut, Style E.

    Ball Nuts,

    Externally

    Threaded Nut,

    Style A

    Ball Nuts

    Flange Nut

    Style E

    Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. To ensure compatibility, select components that have the same thread size and number of thread starts. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.
    Ball Screws—Right-Hand Threaded
    Image of Product. Front orientation. Ball Screws and Nuts. Fast-Travel Ball Screws and Nuts, Ball Screws.
    Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ball Screws and Nuts.
    Carbon Steel—Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
    Root Diameter—Root diameter indicates the diameter the ball screw will be after machining away the threads.
    Thread
    Size
    Lg.,
    mm
    No. of Thread
    Starts
    Travel Distance
    per Turn, mm
    Accuracy for Travel
    Distance per Turn
    Root Dia.,
    mm
    Hardness
    Tensile Strength,
    psi
    Temp. Range,
    ° F
    Each
    Carbon Steel
    M12
    		500210±0.05 mm/300 mm9.6Rockwell C5695,00032 to 1504566N1010000000
    M12
    		1,000210±0.05 mm/300 mm9.6Rockwell C5695,00032 to 1504566N102000000
     
    Externally Threaded Ball Nuts—Right-Hand Threaded
    Image of Product. Front orientation. Contains Annotated. Ball Screws and Nuts. Fast-Travel Ball Screws and Nuts, Ball Nuts, Externally Threaded Nut, Style A.

    Style A

    Carbon Steel—Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
    Style
    Thread
    Size
    Lg.,
    mm
    Dia.,
    mm
    No. of Thread
    Starts
    Travel Distance
    per Turn, mm
    External
    Thread Size
    Hardness
    Dynamic Thrust
    Load Cap., lb.
    Max. Backlash,
    mm
    Temp. Range,
    ° F
    Each
    Carbon Steel
    AM12
    		5030110M25
    		Rockwell C561,0000.0232 to 1504566N3010000000
     
    Flange Ball Nuts—Right-Hand Threaded
    Image of Product. Front orientation. Contains Annotated. Ball Screws and Nuts. Fast-Travel Ball Screws and Nuts, Ball Nuts, Flange Nut, Style E.

    Style E

    Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ball Screws and Nuts.
    Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ball Screws and Nuts.
    Carbon Steel—Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
    Flange,
    mm
    Style
    Thread
    Size
    Lg.,
    mm
    Dia.,
    mm
    Dia.
    Thk.
    No. of Thread
    Starts
    Travel Distance
    per Turn, mm
    Bolt Circle
    Dia., mm
    Hardness
    Dynamic Thrust
    Load Cap., lb.
    Max. Backlash,
    mm
    Temp. Range,
    ° F
    Each
    Carbon Steel
    EM12
    		4323401021032Rockwell C561,1000.0232 to 1504566N4010000000
     

    Ball Screws and Nuts

    Image of ProductInUse. Front orientation. Contains Inset. Ball Screws and Nuts. Ball Screws and Nuts .
    Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, they have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread direction and size. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.
    Ball Screws with Flange Ball Nut—Right-Hand Threaded
    Image of ProductInUse. Front orientation. Contains Annotated. Ball Screws and Nuts. Ball Screws and Nuts , Ball Screws.
    Image of Attribute. Front orientation. Contains Annotated. Ball Screws and Nuts .
    Root diameter indicates the diameter the ball screw will be after machining away the threads.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
    Ball Screw
    Flange Ball
    Nut, mm
    Thread
    Size
    Lg.,
    mm
    Root Dia.,
    mm
    Tensile Strength,
    psi
    Lg.
    Dia.
    Lg. Tolerance
    Type
    No. of Thread
    Starts
    Travel Distance
    per Turn, mm
    Accuracy for Travel
    Distance per Turn
    Hardness
    Dynamic Thrust
    Load Cap., lb.
    Max. Backlash,
    mm
    Temp. Range,
    ° F
    Each
    Carbon Steel Ball Screw with Alloy Steel Flange Ball Nut
    M12
    		20010.621,0003025Plus12±0.210 mm/300 mmRockwell C585600.055 to 1756638K90000000
    M12
    		30010.621,0003025Plus12±0.210 mm/300 mmRockwell C585600.055 to 1756638K11000000
     
    back to top