# SK shaft supports SK8–SK60: centre height, base, bolt spacing and hole size for linear rods > What are the SK8 to SK60 shaft support dimensions: centre height, width, base, bolt spacing and bolt hole? - Category: Hardware › Bearings, rails & motion - Kind: Standard part - Basis: Wangong's SK series table (manufacturer datasheet, hosted by Phidgets) checked against the Motion-and-Drives and Handsontec SK tables, which carry identical values - Page: https://xemstudio.com/objects/sk-shaft-supports/ · JSON: https://xemstudio.com/api/geometry?object=sk-shaft-supports · Plain text: https://xemstudio.com/objects/sk-shaft-supports/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license - Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/) **Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. ## Notes - Dimensions are exact nominal, true size, no tolerance added. Shaft axis horizontal, base flat on the mounting surface. h = shaft centre height above the base (±0.02 on Wangong's drawing), A = width, B = length along the shaft, C = overall height, E = base thickness, F = width of the upright clamp body, R = bolt spacing, T = bolt hole diameter. A/2 is the datum from the side face to the shaft centre (±0.05). - SK8 and SK10 share one housing (42 wide, 20 centre height, 32 bolt spacing); so do SK12 and SK13. Only the bore differs. - The files model the base plate, the upright clamp body, the shaft bore at h and the two vertical bolt holes. Not modelled: the clamp slit and pinch screw (position not tabled) and the rounded top corners (radius not published), so the top is drawn square. - Wangong's table also prints a column S (5 to 14 mm) that its text does not define; it is listed as printed and not used in the files. - Files: sk-shaft-supports--sk8, sk-shaft-supports--sk10, sk-shaft-supports--sk12, sk-shaft-supports--sk16, sk-shaft-supports--sk20, sk-shaft-supports--sk25, sk-shaft-supports--sk30. ## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn) | feature | exact | mates with | fit | files | |---|---|---|---|---| | bore | d (SK8 8, SK12 12, SK20 20) | linear shaft of the same nominal diameter | clamp | all | | bolt holes | T on R (SK8 5.5 on 32, SK20 6.6 on 45) | M5 / M6 / M8 bolts into the frame or extrusion | designed | all | | centre height | h (SK8 20, SK16 27) | matching bearing block centre height on the carriage | designed | all | ## Sizes | size | shaft d | h centre height | A width | B length | C height | E base | F upright | R bolt spacing | T hole | S (undefined) | clamp bolt | mounting bolt | mass g | |---|---|---|---|---|---|---|---|---|---|---|---|---|---| | SK8 | 8 | 20 | 42 | 14 | 32.8 | 6 | 18 | 32 | 5.5 | 5 | M4 | M5 | 24 | | SK10 | 10 | 20 | 42 | 14 | 32.8 | 6 | 18 | 32 | 5.5 | 5 | M4 | M5 | 24 | | SK12 | 12 | 23 | 42 | 14 | 37.5 | 6 | 20 | 32 | 5.5 | 5 | M4 | M5 | 30 | | SK13 | 13 | 23 | 42 | 14 | 37.5 | 6 | 20 | 32 | 5.5 | 5 | M4 | M5 | 30 | | SK16 | 16 | 27 | 48 | 16 | 44 | 8 | 25 | 38 | 5.5 | 5 | M4 | M5 | 40 | | SK20 | 20 | 31 | 60 | 20 | 51 | 10 | 30 | 45 | 6.6 | 7.5 | M5 | M6 | 70 | | SK25 | 25 | 35 | 70 | 24 | 60 | 12 | 38 | 56 | 6.6 | 7 | M6 | M6 | 130 | | SK30 | 30 | 42 | 84 | 28 | 70 | 12 | 44 | 64 | 9 | 10 | M6 | M8 | 180 | | SK35 | 35 | 50 | 98 | 32 | 82 | 15 | 50 | 74 | 11 | 12 | M8 | M10 | 270 | | SK40 | 40 | 60 | 114 | 36 | 96 | 15 | 60 | 90 | 11 | 12 | M8 | M10 | 420 | | SK50 | 50 | 70 | 126 | 40 | 120 | 18 | 74 | 100 | 14 | 13 | M12 | M12 | 750 | | SK60 | 60 | 80 | 148 | 45 | 136 | 18 | 90 | 120 | 14 | 14 | M12 | M12 | 1100 | ## Where the files are - Wangong (manufacturer datasheet, hosted by Phidgets): [Linear guide products: SHF and SK series shaft supports (LMN4221_0 datasheet)](https://phidgets.com/productfiles/LMN4221/LMN4221_0/Documentation/LMN4221_0_DataSheet.pdf) — web — Publisher's page; dimensions are facts - Motion-and-Drives: [SK steel shaft supports technical specification](https://cdn.shopify.com/s/files/1/0509/9690/4105/files/SK_supports_technical_specification.pdf) — web — Publisher's page; dimensions are facts - Handsontec: [SK shaft holder data sheet](https://handsontec.com/dataspecs/sk-shaft-holder.pdf) — web — Publisher's page; dimensions are facts ## Free STEP/STL (7 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/sk-shaft-supports/index.json - sk-shaft-supports--sk10: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk10.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk10.stl) — SK10 shaft support for Ø10 mm rod (Wangong SK series, mounting reference) - sk-shaft-supports--sk12: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk12.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk12.stl) — SK12 shaft support for Ø12 mm rod (Wangong SK series, mounting reference) - sk-shaft-supports--sk16: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk16.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk16.stl) — SK16 shaft support for Ø16 mm rod (Wangong SK series, mounting reference) - sk-shaft-supports--sk20: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk20.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk20.stl) — SK20 shaft support for Ø20 mm rod (Wangong SK series, mounting reference) - sk-shaft-supports--sk25: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk25.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk25.stl) — SK25 shaft support for Ø25 mm rod (Wangong SK series, mounting reference) - sk-shaft-supports--sk30: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk30.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk30.stl) — SK30 shaft support for Ø30 mm rod (Wangong SK series, mounting reference) - sk-shaft-supports--sk8: [STEP](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk8.step) · [STL](https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk8.stl) — SK8 shaft support for Ø8 mm rod (Wangong SK series, mounting reference) ## Questions **What is the SK8 centre height?** 20 mm from the base to the shaft centre; SK8 is 42 wide, 14 long, 32.8 tall, with two 5.5 mm holes 32 mm apart for M5. **Are SK8 and SK10 the same size?** Yes, same 42 × 14 × 32.8 housing, 20 mm centre height and 32 mm bolt spacing; only the bore changes (8 or 10 mm). **What are the SK20 dimensions?** Centre height 31, width 60, length 20, height 51, base 10 thick, two 6.6 mm holes 45 mm apart for M6, M5 clamp screw. ## Fits with - [Linear ball bushings LM..UU and LM..LUU (LM8UU, LM10UU, LM12UU, LM16UU, LM20UU, long LUU): bore, OD, length, ring-groove numbers](https://xemstudio.com/objects/linear-ball-bushings-lm-uu-luu/) - [LM8UU linear bearing Ø8 × Ø15 × 24](https://xemstudio.com/objects/lm8uu-bearing/) - [Pillow block KP08 envelope with a 608 pocket](https://xemstudio.com/objects/pillow-block-kp08/) - [Flanged linear bushings LMF, LMK, LMH (and long LUU): bore, OD, length, flange size, bolt circle, hole + counterbore, 6 to 60 mm + STEP/STL (8 to 20 mm)](https://xemstudio.com/objects/flanged-linear-bushings-lmf-lmk-lmh/) - [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)