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    THK FK Support Unit, Fixed Side, Round Flange (Bore 4-30)

    THK FK Support Unit, Fixed Side, Round Flange (Bore 4-30)

    Round-flange fixed-side support unit with spigot (g6) housing for ball screws, fitted with DF angular contact bearings and lock nut.

    Key features

    • Fixed-side unit with DF-arranged 30 deg contact angle angular ball bearings (P5 class)
    • Flanged round housing with g6 spigot for bore-mounting in a wall or bracket
    • Two mounting directions (mounting method A or B); finished-shaft BNK screws use method A only
    • FK4/5/6 use miniature bearings developed for miniature ball screws
    • Pairs with FF support-side unit; use recommended shaft end H (H1/H2/H3)
    • Supplied with collars, seal(s), lock nut and set screw with set piece

    Specifications

    Brand THK
    Series FK
    Side Fixed side
    Housing Round flange, spigot Dg6
    Bore range 4 - 30 mm
    Bearing Angular contact, DF set, P5
    Matching support side FF
    Recommended shaft end H1 / H2 / H3
    Dimensions L x flange A / spigot D
    Source THK General Catalog Ball Screw (Korean ed. 515-2K), p. A15-354-357
    FK4 Shaft dia d: 4 mm | L x A / D: 15 x 32 / 18 mm | Bearing: 704 equiv. (DF, P5) | Axial Ca / perm. load: 0.93 / 1.1 kN | Axial rigidity: 27 N/um | Mass: 0.05 kg
    FK5 Shaft dia d: 5 mm | L x A / D: 16.5 x 34 / 20 mm | Bearing: 705 equiv. (DF, P5) | Axial Ca / perm. load: 1 / 1.24 kN | Axial rigidity: 29 N/um | Mass: 0.06 kg
    FK6 Shaft dia d: 6 mm | L x A / D: 20 x 36 / 22 mm | Bearing: 706 equiv. (DF, P5) | Axial Ca / perm. load: 1.38 / 1.76 kN | Axial rigidity: 35 N/um | Mass: 0.08 kg
    FK8 Shaft dia d: 8 mm | L x A / D: 23 x 43 / 28 mm | Bearing: 798 equiv. (DF, P5) | Axial Ca / perm. load: 2.93 / 2.15 kN | Axial rigidity: 49 N/um | Mass: 0.15 kg
    FK10 Shaft dia d: 10 mm | L x A / D: 27 x 52 / 34 mm | Bearing: 7000 equiv. (DF, P5) | Axial Ca / perm. load: 6.08 / 3.1 kN | Axial rigidity: 65 N/um | Mass: 0.21 kg
    FK12 Shaft dia d: 12 mm | L x A / D: 27 x 54 / 36 mm | Bearing: 7001 equiv. (DF, P5) | Axial Ca / perm. load: 6.66 / 3.25 kN | Axial rigidity: 88 N/um | Mass: 0.22 kg
    FK15 Shaft dia d: 15 mm | L x A / D: 32 x 63 / 40 mm | Bearing: 7002 equiv. (DF, P5) | Axial Ca / perm. load: 7.6 / 4 kN | Axial rigidity: 100 N/um | Mass: 0.39 kg
    FK20 Shaft dia d: 20 mm | L x A / D: 52 x 85 / 57 mm | Bearing: 7204 equiv. (DF, P5) | Axial Ca / perm. load: 17.9 / 9.5 kN | Axial rigidity: 170 N/um | Mass: 1.09 kg
    FK25 Shaft dia d: 25 mm | L x A / D: 57 x 98 / 63 mm | Bearing: 7205 equiv. (DF, P5) | Axial Ca / perm. load: 20.2 / 11.5 kN | Axial rigidity: 190 N/um | Mass: 1.49 kg
    FK30 Shaft dia d: 30 mm | L x A / D: 62 x 117 / 75 mm | Bearing: 7206 equiv. (DF, P5) | Axial Ca / perm. load: 28 / 16.3 kN | Axial rigidity: 195 N/um | Mass: 2.32 kg
    Ball Screw Support UnitsTHK
    10 product codes available in this family
    Sourced direct from KoreaExport-ready supplyCompetitive pricing
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    THK FK Support Unit, Fixed Side, Round Flange (Bore 4-30)

    Brand THK·Ball Screw Support Units

    Available part numbers (10)

    FK4, FK5, FK6, FK8, FK10, FK12, FK15, FK20, FK25, FK30

    How to order

    Send the THK part numbers and quantities through our RFQ form or to info@prosourcemro.com. We confirm price, availability and lead time within 1 business day — no account needed.

    RFQ List 0 →
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    Product codes & specifications
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    RFQ List (0)
    Product codeSpec
    FK4Shaft dia d: 4 mm | L x A / D: 15 x 32 / 18 mm | Bearing: 704 equiv. (DF, P5) | Axial Ca / perm. load: 0.93 / 1.1 kN | Axial rigidity: 27 N/um | Mass: 0.05 kg
    FK5Shaft dia d: 5 mm | L x A / D: 16.5 x 34 / 20 mm | Bearing: 705 equiv. (DF, P5) | Axial Ca / perm. load: 1 / 1.24 kN | Axial rigidity: 29 N/um | Mass: 0.06 kg
    FK6Shaft dia d: 6 mm | L x A / D: 20 x 36 / 22 mm | Bearing: 706 equiv. (DF, P5) | Axial Ca / perm. load: 1.38 / 1.76 kN | Axial rigidity: 35 N/um | Mass: 0.08 kg
    FK8Shaft dia d: 8 mm | L x A / D: 23 x 43 / 28 mm | Bearing: 798 equiv. (DF, P5) | Axial Ca / perm. load: 2.93 / 2.15 kN | Axial rigidity: 49 N/um | Mass: 0.15 kg
    FK10Shaft dia d: 10 mm | L x A / D: 27 x 52 / 34 mm | Bearing: 7000 equiv. (DF, P5) | Axial Ca / perm. load: 6.08 / 3.1 kN | Axial rigidity: 65 N/um | Mass: 0.21 kg
    FK12Shaft dia d: 12 mm | L x A / D: 27 x 54 / 36 mm | Bearing: 7001 equiv. (DF, P5) | Axial Ca / perm. load: 6.66 / 3.25 kN | Axial rigidity: 88 N/um | Mass: 0.22 kg
    FK15Shaft dia d: 15 mm | L x A / D: 32 x 63 / 40 mm | Bearing: 7002 equiv. (DF, P5) | Axial Ca / perm. load: 7.6 / 4 kN | Axial rigidity: 100 N/um | Mass: 0.39 kg
    FK20Shaft dia d: 20 mm | L x A / D: 52 x 85 / 57 mm | Bearing: 7204 equiv. (DF, P5) | Axial Ca / perm. load: 17.9 / 9.5 kN | Axial rigidity: 170 N/um | Mass: 1.09 kg
    FK25Shaft dia d: 25 mm | L x A / D: 57 x 98 / 63 mm | Bearing: 7205 equiv. (DF, P5) | Axial Ca / perm. load: 20.2 / 11.5 kN | Axial rigidity: 190 N/um | Mass: 1.49 kg
    FK30Shaft dia d: 30 mm | L x A / D: 62 x 117 / 75 mm | Bearing: 7206 equiv. (DF, P5) | Axial Ca / perm. load: 28 / 16.3 kN | Axial rigidity: 195 N/um | Mass: 2.32 kg

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