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SRA 03, 04, 06, 08

SRA Screw Rail Linear Actuator
Linear motion has traditionally required separate components to handle both drive and support/ guidance. The compact Kerk® ScrewRail® combines both functions in a single, coaxial component. By eliminating the need for external rail-to-screw alignment, the ScrewRail simplifies the design, manufacture and assembly of motion systems. The ScrewRail’s coaxial design saves as much as 80% of the space used by a two-rail system and is generally less expensive than the equivalent components purchased separately. The savings can be substantial due to lower component costs and reduced labor. An added benefit is the ability to get three-dimensional motion from a single ScrewRail.

The ScrewRail consists of a precision rolled lead screw, supported by sealed bearings and contained within a concentric steel guide rail, driving an integrated nut/bushing. Because all the alignment requirements are achieved within the ScrewRail, support and positioning of the ScrewRail is much less critical than with traditional slide assemblies. Kerkote® TFE coating and self-lubricating nut/bushing materials ensure long life without maintenance.

When mounted vertically, the ScrewRail can be used to simultaneously lift and rotate (Z-theta motion). With one motor driving the screw and a second rotating the rail, a compact, self-supporting pick and place mechanism can be created.

A standard nut for general applications where anti-backlash compensation is not required.

The SRA is recommended anywhere low drag and minimal free play is required.

Note: Right-hand/Left-hand ScrewRail® assemblies are also available.

  • Specifications +


    ScrewRail
    		 Inch Lead ** Thread Lead Code
    		 Nominal Rail Diam. Nominal Screw Diam. Max. Drag Torque Life @1/4 Design Loadx106
    		 Torque-to-Move Lead Design
    Load
    		 Screw Inertia per unit length Equivalent Diam.*
      inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 oz - in
    (NM)    		 (Non Anti-Backlash)
    inch
    (cm)    		 oz-in/lb
    (NM/Kg)    		 lbs
    (Kg)    		 oz-in sec 2/in
    (KgM2/M)    		 inch
    (mm)
    SRA 03 .050 (1.27) 0050 3/8
    (10)    		 3/16
    (5)    		 1.5
    (0.014)    		 100 to 150
    (250 to 380)    		 0.5
    (0.007)    		 10 (4.5) .1 x 10-5
    (.4 x 10-6)    		 30
    (7.6)
    SRA 03 .100 (2.54) 0100 3/8
    (10)    		 3/16
    (5)    		 2.0
    (0.018)    		 100 to 150
    (250 to 380)    		 1.0
    (0.016)    		 10 (4.5) .1 x 10-5
    (.4 x 10-6)    		 30
    (7.6)
    SRA 03 .250 (6.35) 0250 3/8
    (10)    		 3/16
    (5)    		 2.5
    (0.020)    		 100 to 150
    (250 to 380)    		 1.25
    (0.019)    		 10 (4.5) .1 x 10-5
    (.4 x 10-6)    		 30
    (7.6)
    SRA 03 .375 (9.53) 0375 3/8
    (10)    		 3/16
    (5)    		 3.0
    (0.025)    		 100 to 150
    (250 to 380)    		 2.0
    (0.030)    		 10 (4.5) .1 x 10-5
    (.4 x 10-6)    		 30
    (7.6)
    SRA 04 0.050 (1.27) 0050 1/2
    (13)    		 1/4
    (6)    		 2.0
    (0.015)    		 150 to 200
    (380 to 500)    		 0.5
    (0.007)    		 25
    (10)    		 .3 x 10-5
    (1.3 x 10-6)    		 .39
    (9.9)
    SRA 04 0.250 (6.35) 0250 1/2
    (13)    		 1/4
    (6)    		 3.0
    (0.020)    		 150 to 200
    (380 to 500)    		 1.5
    (0.023)    		 25
    (10)    		 .3 x 10-5
    (1.3 x 10-6)    		 .39
    (9.9)
    SRA 04 0.500 (12.7) 0500 1/2
    (13)    		 1/4
    (6)    		 4.0
    (0.030)    		 150 to 200
    (380 to 500)    		 2.5
    (0.039)    		 25
    (10)    		 .3 x 10-5
    (1.3 x 10-6)    		 .39
    (9.9)
    SRA 04 1.000 (25.40) 1000 1/2
    (13)    		 1/4
    (6)    		 5.0
    (0.040)    		 150 to 200
    (380 to 500)    		 4.5
    (.0.70)    		 25
    (10)    		 .3 x 10-5
    (1.3 x 10-6)    		 .39
    (9.9)
    SRA 06 0.100 (2.54) 0100 3/4
    (19)    		 3/8
    (10)    		 3.0
    (0.020)    		 180 to 280
    (450 to 710)    		 1.0
    (0.016)    		 50
    (20)    		 1.5 x 10-5
    (6.5 x 10-6)    		 .60
    (15.2)
    SRA 06 0.200 (5.08) 0200 3/4
    (19)    		 3/8
    (10)    		 4.0
    (0.030)    		 180 to 280
    (450 to 710)    		 1.5
    (0.023)    		 50
    (20)    		 1.5 x 10-5
    (6.5 x 10-6)    		 .60
    (15.2)
    SRA 06 0.500 (12.70) 0500 3/4
    (19)    		 3/8
    (10)    		 5.0
    (0.040)    		 180 to 280
    (450 to 710)    		 2.5
    (0.039)    		 50
    (20)    		 1.5 x 10-5
    (6.5 x 10-6)    		 .60
     (15.2)
    SRA 06 1.000 (25.4) 1000 3/4
    (19)    		 3/8
    (10)    		 6.0
    (0.045)    		 180 to 280
    (450 to 710)    		 4.5
    (0.070)    		 50
    (20)    		 1.5 x 10-5
    (6.5 x 10-6)    		 .60
    (15.2)
    SRA 08 0.100 (2.54) 0100 1
    (25)    		 1/2
    (13)    		 4.0
    (0.030)    		 280 to 320
    (710 to 810)    		 1.0
    (0.016)    		 100 (45) 5.2 x 10-5
    (20.0 x 10-6)    		 .81
    (20.5)
    SRA 08 0.200 (5.08) 0200 1
    (25)    		 1/2
    (13)    		 5.0
    (0.040)    		 280 to 320
    (710 to 810)    		 1.5
    (0.023)    		 100 (45) 5.2 x 10-5
    (20.0 x 10-6)    		 .81
    (20.5)
    SRA 08 0.500 (12.70) 0500 1
    (25)    		 1/2
    (13)    		 6.0
    (0.045)    		 280 to 320
    (710 to 810)    		 2.5
    (0.039)    		 100 (45) 5.2 x 10-5
    (20.0 x 10-6)    		 .81
    (20.5)
    SRA 08 1.000 (25.40) 1000 1
    (25)    		 1/2
    (13)    		 8.0
    (0.060)    		 280 to 320
    (710 to 810)    		 4.5
    (0.070)    		 100 (45) 5.2 x 10-5
    (20.0 x 10-6)    		 .81
    (20.5)
    *ScrewRail® stiffness may be modeled using Classical Beam Deflection Theory with equivalent stainless steel beam of diameter given.
    ** Other leads available as custom orders.
    Please note: Metric numbers are for reference only.

  • Dimensional Drawings +


    Please note: Metric numbers are for reference only.



    		 A
    Diam.    		 B C
    Diam.    		 D
    Diam.    		 E F G
    Diam.    		 H
    (B.C.D.)    		 I L1 L2
    inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)
    SRA 03 .364/.367
    (9.24/9.32)    		 .38
    (9.56)    		 .1245/.1250
    (3.16/3.18)    		 .98
    (24.9)    		 1
    (25.4)    		 .28
    (7.2)    		 .562
    (14.3)    		 .75
    (19.1)    		 .094
    (2.39)    		 .37
    (9.4)    		 .38
    (9.66)
    SRA 04 .489/.492
    (12.42/12.5)    		 0.62
    (15.75)    		 .1870/.1875
    (4.75/4.76)    		 1.25
    (31.8)    		 1.4
    (36)    		 .38
    (9.5)    		 .750
    (19.1)    		 1.03
    (26.2)    		 0.14
    (3.56)    		 0.26
    (6.6)    		 0.36
    (9.1)
    SRA 06 .739/.742
    (18.77/18.85)    		 0.75
    (19.05)    		 .2490/.2495
    (6.33/6.34)    		 1.75
    (44.5)    		 2
    (51)    		 .50
    (12.7)    		 1.12
    (28.4)    		 1.48
    (37.6)    		 0.173
    (4.39)    		 0.38
    (9.7)    		 0.7
    (17.8)
    SRA 08 .989/.992
    (25.12/25.2)    		 0.75
    (19.05)    		 .2490/.2495
    (6.33/6.34)    		 2.23
    (56.6)    		 2.5
    (64)    		 .63
    (15.9)    		 1.495
    (38.0)    		 1.92
    (48.8)    		 0.2
    (5.08)    		 0.48
    (12.2)    		 0.77
    (19.6)

  • End Supports +


    As an additional option for all Kerk® ScrewRails, standard End Supports offer the convenience of simple and compact mounting for the ScrewRail. The End Supports are designed to slide over the outside diameter of each end of the rail and “key” off the slot in the ScrewRail. The Kerkite® composite polymer End Supports come standard with three hex nuts that are captured in the flange for easy assembly. The End Supports are also supplied with a brass threaded insert and a set screw to fasten to the outside diameter of the rail.

    With the End Supports, the Kerk ScrewRail can be easily mounted to your assembly. However, if the End Supports are not utilized it is recommended to center the clamping force on each end at the L3 dimension as shown in the drawing below.
    A
    Diam.    		 D F H
    Diam.    		 L3 L4 Q R S T
    (HexNut)    		 U W Diam.
    (BrassInsert)    		 X Y
    inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)    		 inch
    (mm)
    SRA 04 .624/.626
    (15.85/15.90)    		 1.35
    (34.3)    		 0.2
    (5.08)    		 0.15
    (3.81)    		 0.39
    (9.91)    		 .720
    (18.29)    		 0.08
    (2.03)    		 0.06
    (1.52)    		 #6-32
    ( * )    		 1.03
    (26.2)    		 #8-32 0.47
    (12.0)    		 0.46
    (11.68)    		 0.5
    (12.70)
    SRA 06 .749/.751
    (19.03/19.08)    		 1.6
    (40.6)    		 0.25
    (6.35)    		 0.173
    (4.39)    		 0.603
    (15.32)    		 0.9
    (22.86)    		 0.1
    (2.54)    		 0.1
    (2.54)    		 #8-32
    ( * )    		 1.31
    (33.3)
    #10-32    		 0.6
    (15.3)    		 0.594
    (15.09)    		 0.645
    (16.38)
    SRA 08 .999/1.001
    (25.38/25.43)    		 2.2
    (55.9)    		 0.375
    (9.53)    		 0.2
    (5.08)    		 0.92
    (23.37)    		 1.2
    (30.48)    		 0.125
    (3.18)    		 0.175
    (4.45)    		 #10-32
    ( * )    		 1.82
    (46.2)
    #10-32    		 0.82
    (20.9)    		 0.8
    (20.32)    		 0.82
    (20.83)
    * metric available as requested


    Please note: Metric numbers are for reference only.

  • Customize +


    Haydon Kerk can custom-design and manufacture unique motorized RGS linear rails solutions to your equipment requirements. Special motor attributes, rail lengths, multiple carriages, alternate lead screws, lubrication, encoders and integrated drives are just some of the typical adaptations engineered to customer needs. Every Haydon Kerk linear rail product is supported by an experienced technical team recognized for innovation, customization, and dedicated customer service.

  • Part Number Guide +


    SR

    Z

    06

    K

    -

    A

    0100

    -

    XXX

    Prefix

    Nut Style

    Nominal Rail Diam.

    Coating

     

    Drive/

    Mounting

    Nominal Thread Lead Code

     

    Unique Identifier

    SR=

    Screw Rail

    A=Free Wheeling Nut
    Z=Anti-Backlash Nut

    03=3/8-in
    (10)
    04*=1/2-in (13)
    06*=3/4-in (19)
    08* = 1-in
    (25)

    S=Uncoated
    K=Kerkote

     

    A=None

    SRA/SRZ03:
    0050=.050-in
    (1.27)
    0100=.100-in
    (2.54)
    0250=.250-in
    (6.35)
    0375=.375-in
    (9.53)
    SRA/SRZ04:
    0050=.050-in
    (1.27)
    0250=.250-in
    (6.35)
    0500=.500-in
    (12.7)
    1000=1.00-in
    (25.40)
    SRA/SRZ06:
    0100=.100-in
    (2.54)
    0200=.200-in
    (5.08)
    0500=.500-in
    (12.7)
    1000=1.00-in
    (25.40)
    SRA/SRZ08:
    0100=.100-in
    (2.54)
    0200=.200-in
    (5.08)
    0500=.500-in
    (12.7)
    1000=1.00-in
    (25.40)

     

    Proprietary suffix assigned to a specific customer application. The identifier can apply to either a standard or custom part

    *End Supports available

    NOTE: Right-hand/Left-hand ScrewRail assemblies are also available

    NOTE: Dashes must be included in Part Number (–) as shown above. For assistance call our Engineering Team at 203 756 7441.

    End Support part number guide

    SR

    04

    ES

    -

    Z00

    Prefix

    Nominal Size Diameter

    Coating

    Identifier

    SR=

    Screw Rail

    04=1/2-in (13)
    06=3/4-in (19)
    08 = 1-in (25)

    ES=End Support

    Standard