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    20 Products

    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 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 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.
    Lead Screws—Right-Hand Thread
    Image of Product. Front orientation. Precision Lead Screws and Nuts. Ultra-Precision Lead Screws and Nuts, Lead Screws—Right-Hand Thread.
    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.
    Thread
    Size
    Lg.,
    ft.
    Thread Type
    Speed
    Ratio
    No. of Thread
    Starts
    Travel Distance
    per Turn
    Accuracy for Travel
    Distance per Turn
    Hardness
    Tensile Strength,
    psi
    Each
    303 Stainless Steel
    1/2"-20
    		3Rounded Acme
    		1:110.05"±0.0006"/1"Brinell 16090,0006350K7110000000
    1/2"-20
    		6Rounded Acme
    		1:110.05"±0.0006"/1"Brinell 16090,0006350K135000000
     
    Flange Nuts—Right-Hand Thread
    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 B

    Style C

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

    Style B

    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.
    Thk.
    Thread Type
    Speed
    Ratio
    Bolt Circle
    Dia.
    No. of Thread
    Starts
    Travel Distance
    per Turn
    Hardness
    Tensile Strength,
    psi
    Dynamic Thrust
    Load Cap., lb.
    No. of Mounting
    Holes
    Each
    Acetal
    B1/2"-20
    		1 1/2"0.75"1 1/2"3/16"Rounded Acme
    		1:11 1/8"10.05"Not Rated9,70015036350K173000000
     
    Acetal with Wear-Compensating Spring
    C1/2"-20
    		2"0.891"1 39/64"17/64"Rounded Acme
    		1:11 1/4"10.05"Not Rated9,7002536350K21100000
     

    Acme Screw Jacks

    Image of Product. Front orientation. Contains Annotated. Jacks. Acme Screw Jacks, Upright Screw Jack.
    Image of Product. Front orientation. Contains Annotated. Jacks. Acme Screw Jacks, Inverted Screw Jack.
    Image of Attribute. Top View. Top orientation. Contains Annotated. Jacks. Acme Screw Jacks.

    Upright Screw Jack

    Inverted Screw Jack

    Top View

    Broad, strong Acme threads make these screw jacks better than ball screw jacks for heavy loads, intermittent positioning applications, and where vibration is present. Screw jacks come assembled, threaded, and ready for hookup. Connect a motor or hand-crank shaft to the screw jack shaft to lift, hold, position, and level loads.
    Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a load moves with one revolution of the shaft.
    Keyway
    Body
    Tube
    Attachment
    Thread
    Travel
    Lg.
    Lifting Screw
    Thread Size
    Travel Distance
    per Turn
    Shaft
    Dia.
    Lg.
    Wd.
    Dp.
    Lg.
    Wd.
    Dp.
    Lg.
    Dia.
    Bearing
    Thk.
    Lg.
    Size
    Input Starting Torque
    @ Input Speed
    Each
    Upright Screw Jack
     
    250 lb. Capacity—Carbon Steel Lifting Screw
    3"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"3 7/16"27/32"—1 1/2"1/2"-20
    		7 in·lbf @ 500 rpm5945K110000000
    6"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"6 7/16"27/32"—1 1/2"1/2"-20
    		7 in·lbf @ 500 rpm5945K12000000
    9"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"9 7/16"27/32"—1 1/2"1/2"-20
    		7 in·lbf @ 500 rpm5945K13000000
    12"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"12 7/16"27/32"—1 1/2"1/2"-20
    		7 in·lbf @ 500 rpm5945K14000000
     
    500 lb. Capacity—304 Stainless Steel Lifting Screw
    3"5/8"-40.05"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"3 7/16"27/32"—1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K15000000
    6"5/8"-40.05"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"6 7/16"27/32"—1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K16000000
    9"5/8"-40.05"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"9 7/16"27/32"—1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K17000000
    12"5/8"-40.05"3/8"3/4"1/8"1/16"2 3/8"4"2 27/32"12 7/16"27/32"—1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K18000000
     
    Inverted Screw Jack
     
    250 lb. Capacity—Carbon Steel Lifting Screw
    3"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"3 7/16"27/32"1/4"1 5/8"1/2"-20
    		7 in·lbf @ 500 rpm5945K24000000
    6"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"6 7/16"27/32"1/4"1 5/8"1/2"-20
    		7 in·lbf @ 500 rpm5945K25000000
    9"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"9 7/16"27/32"1/4"1 5/8"1/2"-20
    		7 in·lbf @ 500 rpm5945K26000000
    12"1/2"-8
    		0.025"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"12 7/16"27/32"1/4"1 5/8"1/2"-20
    		7 in·lbf @ 500 rpm5945K27000000
     
    500 lb. Capacity—304 Stainless Steel Lifting Screw
    3"5/8"-40.05"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"3 7/16"27/32"1/4"1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K28000000
    6"5/8"-40.05"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"6 7/16"27/32"1/4"1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K29000000
    9"5/8"-40.05"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"9 7/16"27/32"1/4"1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K31000000
    12"5/8"-40.05"3/8"3/4"1/8"1/16"2 5/16"4"2 27/32"12 7/16"27/32"1/4"1 1/2"1/2"-20
    		21 in·lbf @ 500 rpm5945K32000000
     
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