# 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?

- Category: Hardware › Bearings, rails & motion
- Kind: 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
- Page: https://xemstudio.com/objects/jaw-spider-couplings-l-series/ · JSON: https://xemstudio.com/api/geometry?object=jaw-spider-couplings-l-series · Plain text: https://xemstudio.com/objects/jaw-spider-couplings-l-series/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.** True size, with no tolerance added.

## 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.

## Sizes

| size | pilot bore, mm | max bore, mm | overall Ø, mm | assembled length, mm | hub width, mm | hub Ø, mm | set screw |
|---|---|---|---|---|---|---|---|
| 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 |

## Where the files are

- 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](https://bepltd.com/cdn/shop/files/LOVEJOY-COUPLING.pdf) — web — Publisher's page; dimensions are facts
- Qtec Technology: [Jaw coupling hubs L050 to L190 (inch): OD and overall length, bores](https://www.qtec-technology.com/uploads/society/download/catalog/3/124.pdf) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Jaw (spider) couplings (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/jaw-couplings/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Jaw coupling hubs (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/jaw-coupling-hubs) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## 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.

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