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Jaw (spider) couplings L035 to L225: bore range, overall diameter, length, hub width, set screw

What are the dimensions of L050, L070, L075, L090, L095 and L100 jaw couplings: bore range, outside diameter, length and hub width? · Standard part · basis: BEP metric jaw coupling table, compared with McMaster-Carr's jaw coupling sizes and Qtec's inch table; McMaster-Carr linked for CAD

Also called: 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

Exact dimensions. True size, with no tolerance added.

sizes
11 in table

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.

Jaw (spider) couplings L035 to L225: bore range, overall diameter… size chart

sizepilot bore, mmmax bore, mmoverall Ø, mmassembled length, mmhub width, mmhub Ø, mmset screw
L035381620 (McMaster 21)716M3
L05061427.5 (McMaster 27)441627.5M6
L07091935511935M6
L07592444.5 (McMaster 45)542144.5M6
L09092454542154M6
L09592854642554M8
L100123565893565M8
L110154284 (McMaster 85)1084384M10
L1501548961154596M10
L1901955115133 (McMaster 124)54102M12
L2251960127153 (McMaster 137)64108M12

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

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 screwwebPublisher's page; dimensions are facts
Qtec TechnologyJaw coupling hubs L050 to L190 (inch): OD and overall length, boreswebPublisher's page; dimensions are facts
McMaster-CarrJaw (spider) couplings (free STEP/IGES per part, for your own design use; no redistribution)STEP, IGES, PDFMcMaster-Carr site terms: personal design use, no redistribution verify
McMaster-CarrJaw coupling hubs (free STEP/IGES per part, for your own design use; no redistribution)STEP, IGES, PDFMcMaster-Carr site terms: personal design use, no redistribution verify

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

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Plain text: sheet.txt · JSON: /api/geometry?object=jaw-spider-couplings-l-series

length
Schematic, not to scale.

Fits with

Flexible shaft couplers, 5–10 mm bores, isometric render of a generated part
Flexible shaft couplers, 5–10 mm bores6 sizes★ 6 files
Bellows couplings (GN 2244 and common sizes): outside diameter, length, clamp screw, rated torque, misalignment11 sizes★ sheet
NEMA 23 stepper motor: 56.4 mm face, 47.14 mm hole pattern, isometric render of a generated part
NEMA 23 stepper motor: 56.4 mm face, 47.14 mm hole pattern6 sizes★ 2 files
T8 lead screw Tr8×8 envelope, 100 to 400 mm, isometric render of a generated part
T8 lead screw Tr8×8 envelope, 100 to 400 mm6 sizes★ 6 files
Ball screw nuts SFU1204, SFU1605, SFU1610, SFU2005: flange diameter, bolt circle, hole size, flats and length (SFU2010 length)5 sizes★ sheet
Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long, isometric render of a generated part
Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long10 sizes★ 70 files

Questions

What are the dimensions of an L070 jaw coupling?

Overall Ø35, assembled length 51, hub width 19, bore 9 (pilot) to 19 (max), M6 set screw.

What are the dimensions of an L090?

Overall Ø54, length 54, hub width 21, bore 9 to 24, M6 set screw.

What is the largest bore of an L100?

35 mm (pilot 12), overall Ø65, length 89.

What is the difference between a jaw coupling and a helical coupler?

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.