{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "jaw-spider-couplings-l-series", "name": "Jaw (spider) couplings L035 to L225: bore range, overall diameter, length, hub width, set screw", "kind": "standard", "category": "Hardware", "group": "Bearings, rails & motion", "year": null, "question": "What are the dimensions of L050, L070, L075, L090, L095 and L100 jaw couplings: bore range, outside diameter, length and hub width?", "tags": [ "jaw coupling", "spider coupling", "l050", "l070", "l090", "l100", "shaft coupler", "lovejoy", "module" ], "aliases": [ "l050 coupling dimensions", "l070 coupling dimensions", "l075 coupling dimensions", "l090 coupling dimensions", "l095 coupling dimensions", "l100 coupling dimensions", "l110 coupling dimensions", "l035 coupling", "jaw coupling dimensions", "spider coupling dimensions", "l070 jaw coupling bore", "l100 jaw coupling 12mm 35mm", "jaw coupling cad", "l090 54 diameter coupling" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "not-scanned", "les": false, "free_files": 0, "url": "https://xemstudio.com/objects/jaw-spider-couplings-l-series/", "sheet_txt": "https://xemstudio.com/objects/jaw-spider-couplings-l-series/sheet.txt", "sheet": { "basis": "BEP metric jaw coupling table, compared with McMaster-Carr's jaw coupling sizes and Qtec's inch table; McMaster-Carr linked for CAD", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "Jaw couplings (spider couplings, L-series, 'lovejoy' style) join two shafts with two metal hubs with interlocking jaws and an elastomer spider between them: they absorb small misalignment and damp vibration but are not torsionally stiff. The L number names the size (L050, L070, L090 and L100 are the common ones for steppers, servos and small motors); hubs come pilot-bored or finished to a bore up to the maximum listed.", "Numbers: BEP's metric table (pilot bore, maximum bore, overall Ø, assembled length, hub width, hub Ø, set screw), compared with McMaster-Carr's jaw coupling listing (overall Ø × length) and a Qtec inch table. Where McMaster differs the McMaster value is shown in brackets: the overall Ø agrees within 1 mm (L050 27.5 / 27, L075 44.5 / 45, L110 84 / 85), the length agrees for 9 of the 11 sizes and differs for L035 (20 against 21), L190 (133 against 124, Qtec inch 4-7/8) and L225 (153 against 137).", "Where the lengths disagree the sources are for different hub/spider assemblies (hub widths and spider thickness vary between makers): use the maker's drawing for a length-critical design. McMaster also lists an L099 (65 × 73) which the BEP table does not have.", "Files: none. The hub profile (jaw teeth, spider lobes, clamp or set-screw boss) is not in the tables.", "Left out: keyways, spider hardness grades, torque ratings, taper-lock and clamp-style hubs, inch metric bore lists." ], "table": { "columns": [ "size", "pilot bore, mm", "max bore, mm", "overall Ø, mm", "assembled length, mm", "hub width, mm", "hub Ø, mm", "set screw" ], "rows": [ [ "L035", "3", "8", "16", "20 (McMaster 21)", "7", "16", "M3" ], [ "L050", "6", "14", "27.5 (McMaster 27)", "44", "16", "27.5", "M6" ], [ "L070", "9", "19", "35", "51", "19", "35", "M6" ], [ "L075", "9", "24", "44.5 (McMaster 45)", "54", "21", "44.5", "M6" ], [ "L090", "9", "24", "54", "54", "21", "54", "M6" ], [ "L095", "9", "28", "54", "64", "25", "54", "M8" ], [ "L100", "12", "35", "65", "89", "35", "65", "M8" ], [ "L110", "15", "42", "84 (McMaster 85)", "108", "43", "84", "M10" ], [ "L150", "15", "48", "96", "115", "45", "96", "M10" ], [ "L190", "19", "55", "115", "133 (McMaster 124)", "54", "102", "M12" ], [ "L225", "19", "60", "127", "153 (McMaster 137)", "64", "108", "M12" ] ] } }, "sheet_text": "Jaw (spider) couplings L035 to L225: bore range, overall diameter, length, hub width, set screw — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/jaw-spider-couplings-l-series/ (sheet CC BY 4.0)\nBasis: BEP metric jaw coupling table, compared with McMaster-Carr's jaw coupling sizes and Qtec's inch table; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Jaw couplings (spider couplings, L-series, 'lovejoy' style) join two shafts with two metal hubs with interlocking jaws and an elastomer spider between them: they absorb small misalignment and damp vibration but are not torsionally stiff. The L number names the size (L050, L070, L090 and L100 are the common ones for steppers, servos and small motors); hubs come pilot-bored or finished to a bore up to the maximum listed.\n- Numbers: BEP's metric table (pilot bore, maximum bore, overall Ø, assembled length, hub width, hub Ø, set screw), compared with McMaster-Carr's jaw coupling listing (overall Ø × length) and a Qtec inch table. Where McMaster differs the McMaster value is shown in brackets: the overall Ø agrees within 1 mm (L050 27.5 / 27, L075 44.5 / 45, L110 84 / 85), the length agrees for 9 of the 11 sizes and differs for L035 (20 against 21), L190 (133 against 124, Qtec inch 4-7/8) and L225 (153 against 137).\n- Where the lengths disagree the sources are for different hub/spider assemblies (hub widths and spider thickness vary between makers): use the maker's drawing for a length-critical design. McMaster also lists an L099 (65 × 73) which the BEP table does not have.\n- Files: none. The hub profile (jaw teeth, spider lobes, clamp or set-screw boss) is not in the tables.\n- Left out: keyways, spider hardness grades, torque ratings, taper-lock and clamp-style hubs, inch metric bore lists.\n\nsize pilot bore, mm max bore, mm overall Ø, mm assembled length, mm hub width, mm hub Ø, mm set screw\nL035 3 8 16 20 (McMaster 21) 7 16 M3\nL050 6 14 27.5 (McMaster 27) 44 16 27.5 M6\nL070 9 19 35 51 19 35 M6\nL075 9 24 44.5 (McMaster 45) 54 21 44.5 M6\nL090 9 24 54 54 21 54 M6\nL095 9 28 54 64 25 54 M8\nL100 12 35 65 89 35 65 M8\nL110 15 42 84 (McMaster 85) 108 43 84 M10\nL150 15 48 96 115 45 96 M10\nL190 19 55 115 133 (McMaster 124) 54 102 M12\nL225 19 60 127 153 (McMaster 137) 64 108 M12\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- BEP Ltd (L-series coupling table): Jaw coupling L035 to L225: pilot and max bore, overall diameter B, assembled length L, hub width C, hub diameter D, position F, set screw — web — Publisher's page; dimensions are facts — https://bepltd.com/cdn/shop/files/LOVEJOY-COUPLING.pdf\n- Qtec Technology: Jaw coupling hubs L050 to L190 (inch): OD and overall length, bores — web — Publisher's page; dimensions are facts — https://www.qtec-technology.com/uploads/society/download/catalog/3/124.pdf\n- McMaster-Carr: Jaw (spider) couplings (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/jaw-couplings/\n- McMaster-Carr: Jaw coupling hubs (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/jaw-coupling-hubs\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=jaw-spider-couplings-l-series\n", "sources": [ { "publisher": "BEP Ltd (L-series coupling table)", "title": "Jaw coupling L035 to L225: pilot and max bore, overall diameter B, assembled length L, hub width C, hub diameter D, position F, set screw", "url": "https://bepltd.com/cdn/shop/files/LOVEJOY-COUPLING.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Qtec Technology", "title": "Jaw coupling hubs L050 to L190 (inch): OD and overall length, bores", "url": "https://www.qtec-technology.com/uploads/society/download/catalog/3/124.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Jaw (spider) couplings (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/products/jaw-couplings/", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Jaw coupling hubs (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/products/jaw-coupling-hubs", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false } ], "xem": { "status": "not-scanned", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "shaft-couplers", "bellows-couplings", "nema-23-stepper", "t8-lead-screw", "ball-screw-nuts-sfu", "linear-shafts-h6" ], "fits": [], "dimensions": "exact (nominal, no tolerance added)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/", "mating": [], "faq": [ { "q": "What are the dimensions of an L070 jaw coupling?", "a": "Overall Ø35, assembled length 51, hub width 19, bore 9 (pilot) to 19 (max), M6 set screw." }, { "q": "What are the dimensions of an L090?", "a": "Overall Ø54, length 54, hub width 21, bore 9 to 24, M6 set screw." }, { "q": "What is the largest bore of an L100?", "a": "35 mm (pilot 12), overall Ø65, length 89." }, { "q": "What is the difference between a jaw coupling and a helical coupler?", "a": "A jaw coupling has a rubber spider between two hubs (damping, but backlash-free only when preloaded); a helical coupler is a single piece cut into a spiral. The helical sizes are on the shaft-couplers page." } ], "files_license": null, "offers": [], "markdown": "https://xemstudio.com/objects/jaw-spider-couplings-l-series/index.md" }