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)
    Help me decide (beta)
    64 Products
    About Carriages and Guide Rails
    industrial info icon

    Stabilize your carriages against pitch, roll, and yaw forces by installing them in pairs.

    Ultra-Precision Lead Screws and Nuts

    Image of ProductInUse. Front orientation. Contains Inset. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts.
    Image of Product. Style A. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style A.
    Image of Product. Style B. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style B.
    Image of Product. Style C. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style C.

    Style A

    Style B

    Style C

    Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.
    Flange Nuts—Right-Hand Thread
    Image of Product. Style A. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style A.
    Image of Product. Style B. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style B.
    Image of Product. Style C. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style C.

    Style A

    Style B

    Style C

    Image of Attribute. Front orientation. Contains Annotated. Ultra-Precision Lead Screws and Nuts, Nuts, Flange Nut, Style B.

    Style B

    Image of Attribute. Front orientation. Contains Annotated. Ultra-Precision Lead Screws and Nuts, Nuts, Flange Nut, Style C.

    Style C

    Acetal—Acetal nuts have good wear and corrosion resistance.
    Wear-Compensating Spring—Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
    Flange
    Style
    Thread
    Size
    Lg.
    Dia.
    Dia.
    Wd.
    Ht.
    Thk.
    Thread Type
    Speed
    Ratio
    Bolt Circle
    Dia.
    No. of Thread
    Starts
    Travel Distance
    per Turn
    Mounting Hole
    Ctr.-to-Ctr.
    Hardness
    Tensile
    Strength
    Dynamic Thrust
    Load Cap., lb.
    No. of Mounting
    Holes
    Each
    Acetal
    A1/8"-20.8
    		1/2"0.4"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.048"39/64"Not Rated9,000 psi2526350K682000000
    A1/8"-41.7
    		1/2"0.4"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.024"39/64"Not Rated9,000 psi2526350K68100000
    A9/64"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.048"39/64"Not RatedNot Rated2526642K2200000
    A9/64"-41.7
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.024"39/64"Not RatedNot Rated2526642K2100000
    A7/32"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.048"39/64"Not RatedNot Rated2526642K2400000
    B1/4"-20
    		1"0.5"1"——3/16"Rounded Acme
    		1:13/4"10.05"—Not Rated9,700 psi5036350K17100000
    B1/4"-40
    		1"0.5"1"——3/16"Rounded Acme
    		1:13/4"10.025"—Not Rated9,000 psi5036350K68300000
    B3/8"-10
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		1:17/8"10.1"—Not Rated9,700 psi7536350K3300000
    B3/8"-20
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		1:17/8"10.05"—Not Rated9,700 psi7536350K17200000
    B3/8"-40
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		1:17/8"10.025"—Not Rated9,700 psi7536350K17500000
    B1/2"-8
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		1:11 1/8"10.125"—Not Rated9,700 psi15036350K16300000
    B1/2"-10
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		1:11 1/8"10.1"—Not Rated9,700 psi15036350K4100000
    B1/2"-20
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		1:11 1/8"10.05"—Not Rated9,700 psi15036350K17300000
    B5/8"-10
    		1 1/2"0.875"1 1/2"——3/16"Rounded Acme
    		1:11 3/16"10.1"—Not Rated9,700 psi22036350K16700000
    B3/4"-10
    		2"1.125"1 51/64"——1/4"Rounded Acme
    		1:11 7/16"10.1"—Not Rated9,700 psi35036350K16800000
     
    Acetal with Wear-Compensating Internal O-Ring
    A9/64"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.048"39/64"Not RatedNot Rated526642K3200000
    A9/64"-41.7
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.024"39/64"Not RatedNot Rated526642K3100000
    A7/32"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		1:1—10.048"39/64"Not RatedNot Rated526642K3400000
     
    Acetal with Wear-Compensating Spring
    B3/4"-10
    		2 45/64"1.563"2 13/32"——5/16"Rounded Acme
    		1:12"10.1"—Not Rated9,700 psi15036350K206000000
    C1/4"-20
    		1"0.5"1"——3/16"Rounded Acme
    		1:13/4"10.05"—Not Rated9,700 psi536350K20800000
    C3/8"-10
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		1:11 1/8"10.1"—Not Rated9,700 psi1036350K5300000
    C3/8"-20
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		1:11 1/8"10.05"—Not Rated9,700 psi1036350K20900000
    C3/8"-40
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		1:11 1/8"10.025"—Not Rated9,700 psi1036350K21300000
    C1/2"-8
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		1:11 1/4"10.125"—Not Rated9,700 psi2536350K20100000
    C1/2"-10
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		1:11 1/4"10.1"—Not Rated9,700 psi2536350K6100000
    C1/2"-20
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		1:11 1/4"10.05"—Not Rated9,700 psi2536350K21100000
    C5/8"-10
    		2"1.063"1 51/64"——17/64"Rounded Acme
    		1:11 3/8"10.1"—Not Rated9,700 psi3536350K20500000
     

    Fast-Travel Ultra-Precision Lead Screws and Nuts

    Image of ProductInUse. Front orientation. Contains Inset. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts.
    Image of Product. Style A. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style A.
    Image of Product. Style B. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style B.
    Image of Product. Style C. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style C.

    Style A

    Style B

    Style C

    Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.
    Flange Nuts—Right-Hand Thread
    Image of Product. Style A. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style A.
    Image of Product. Style B. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style B.
    Image of Product. Style C. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Ultra-Precision Lead Screws and Nuts, Flange Nuts—Right-Hand Thread, Style C.

    Style A

    Style B

    Style C

    Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ultra-Precision Lead Screws and Nuts, Nuts, Flange Nut, Style B.

    Style B

    Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ultra-Precision Lead Screws and Nuts, Nuts, Flange Nut, Style C.

    Style C

    Acetal—Acetal nuts have good wear and corrosion resistance.
    Wear-Compensating Internal O-Ring and Wear-Compensating Spring—Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.
    Flange
    Style
    Thread
    Size
    Lg.
    Dia.
    Dia.
    Wd.
    Ht.
    Thk.
    Thread Type
    Speed
    Ratio
    Bolt Circle
    Dia.
    No. of Thread
    Starts
    Travel Distance
    per Turn
    Mounting Hole
    Ctr.-to-Ctr.
    Hardness
    Tensile
    Strength
    Dynamic Thrust
    Load Cap., lb.
    No. of Mounting
    Holes
    Each
    Acetal
    A9/64"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		2:1—20.096"39/64"Not RatedNot Rated2526642K23000000
    A5/32"-21.3
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		2:1—20.094"39/64"Not RatedNot Rated2526642K2500000
    A3/16"-42.7
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		16:1—160.375"39/64"Not RatedNot Rated2526642K5700000
    A7/32"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		4:1—40.192"39/64"Not RatedNot Rated2526642K2600000
    B1/4"-8
    		1"0.5"1"——3/16"Rounded Acme
    		8:13/4"81"—Not Rated9,700 psi5036350K3200000
    B1/4"-16
    		1"0.5"1"——3/16"Rounded Acme
    		4:13/4"40.25"—Not Rated9,700 psi5036350K3100000
    B1/4"-20
    		1"0.5"1"——3/16"Rounded Acme
    		2:13/4"20.1"—Not Rated9,700 psi5036350K16600000
    B3/8"-5
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		5:17/8"51"—Not Rated9,700 psi7536350K3600000
    B3/8"-8
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		4:17/8"40.5"—Not Rated9,700 psi7536350K3500000
    B3/8"-10
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		2:17/8"20.2"—Not Rated9,700 psi7536350K3400000
    B3/8"-12
    		1"0.625"1 7/64"——3/16"Rounded Acme
    		3:17/8"30.25"—Not Rated9,700 psi7536350K15100000
    B1/2"-8
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		2:11 1/8"20.25"—Not Rated9,700 psi15036350K15300000
    B1/2"-8
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		4:11 1/8"40.5"—Not Rated9,700 psi15036350K4300000
    B1/2"-8
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		8:11 1/8"81"—Not Rated9,700 psi15036350K4400000
    B1/2"-10
    		1 1/2"0.75"1 1/2"——3/16"Rounded Acme
    		2:11 1/8"20.2"—Not Rated9,700 psi15036350K4200000
    B5/8"-6
    		1 1/2"0.875"1 1/2"——3/16"Rounded Acme
    		12:11 3/16"122"—Not Rated9,700 psi22036350K13900000
    B5/8"-8
    		1 1/2"0.875"1 1/2"——3/16"Rounded Acme
    		4:11 3/16"40.5"—Not Rated9,700 psi22036350K14500000
    B3/4"-8
    		2"1.125"1 3/4"——1/4"Rounded Acme
    		8:11 7/16"81"—Not Rated9,000 psi35036350K68400000
    B3/4"-8
    		2"1.125"1 51/64"——1/4"Rounded Acme
    		2:11 7/16"20.25"—Not Rated9,700 psi35036350K4500000
     
    Acetal with Wear-Compensating Internal O-Ring
    A9/64"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		2:1—20.096"39/64"Not RatedNot Rated526642K3300000
    A5/32"-21.3
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		2:1—20.094"39/64"Not RatedNot Rated526642K3500000
    A3/16"-42.7
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		16:1—160.375"39/64"Not RatedNot Rated526642K6700000
    A7/32"-20.8
    		1/2"0.406"—3/4"13/32"1/8"Rounded Acme
    		4:1—40.192"39/64"Not RatedNot Rated526642K3600000
     
    Acetal with Wear-Compensating Spring
    B3/4"-8
    		2 45/64"1.563"2 13/32"——5/16"Rounded Acme
    		2:12"20.25"—Not Rated9,700 psi15036350K65000000
    C1/4"-8
    		1"0.5"1"——3/16"Rounded Acme
    		8:13/4"81"—Not Rated9,700 psi536350K5200000
    C1/4"-16
    		1"0.5"1"——3/16"Rounded Acme
    		4:13/4"40.25"—Not Rated9,700 psi536350K5100000
    C1/4"-20
    		1"0.5"1"——3/16"Rounded Acme
    		2:13/4"20.1"—Not Rated9,700 psi536350K20400000
    C3/8"-5
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		5:11 1/8"51"—Not Rated9,700 psi1036350K5600000
    C3/8"-8
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		4:11 1/8"40.5"—Not Rated9,700 psi1036350K5500000
    C3/8"-10
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		2:11 1/8"20.2"—Not Rated9,700 psi1036350K5400000
    C3/8"-12
    		1 29/32"0.703"1 1/2"——3/16"Rounded Acme
    		3:11 1/8"30.25"—Not Rated9,700 psi1036350K18800000
    C1/2"-8
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		2:11 1/4"20.25"—Not Rated9,700 psi2536350K19100000
    C1/2"-8
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		4:11 1/4"40.5"—Not Rated9,700 psi2536350K6300000
    C1/2"-8
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		8:11 1/4"81"—Not Rated9,700 psi2536350K6400000
    C1/2"-10
    		2"0.891"1 39/64"——17/64"Rounded Acme
    		2:11 1/4"20.2"—Not Rated9,700 psi2536350K6200000
    C5/8"-6
    		2"1.063"1 51/64"——17/64"Rounded Acme
    		12:11 3/8"122"—Not Rated9,700 psi3536350K17700000
    C5/8"-8
    		2"1.063"1 51/64"——17/64"Rounded Acme
    		4:11 3/8"40.5"—Not Rated9,700 psi3536350K18300000
     
    back to top