Xem Studiomeasured geometry

Library › Tools & garage › Trailer balls ·

CURT 40085 trailer ball (2-5/16 in ball, 1-1/4 × 2-5/8 in shank, 30,000 lb)

What are the dimensions of the CURT 40085 trailer ball? · Modern device · basis: Manufacturer specifications (Lippert (CURT))

Also called: curt 40085, 2-5/16 inch trailer ball dimensions, 2-5/16 hitch ball 1-1/4 inch shank, 2-5/16 inch ball size mm, 2-5/16 ball coupler fit, trailer ball shank size, 2-5/16 inch hitch ball cover, hitch ball sizes chart, bola de remolque 2-5/16, Kugelkopf 2-5/16 Zoll, bola de engate medidas

Exact dimensions. True size, with no printing tolerance added.

length
58.74 mm
width
58.74 mm

Notes

  • CURT part 40085 is a 2-5/16 in trailer ball on a 1-1/4 in diameter × 2-5/8 in long shank, rated 30,000 lb GTW.
  • Ball and shank sizes are from the product title; rise, flat size and thread are not published.
  • Ball-mount hole must match the shank diameter; shank length must cover the mount thickness plus washer and nut.
  • True size, no printing tolerance added. Only published numbers are used; anything not published is said so.

CURT 40085 trailer ball size chart

dimensionvalue
Ball diameter2 5/16 in (58.74 mm)
Shank diameter1 1/4 in (31.75 mm)
Shank length2 5/8 in (66.67 mm)
Gross trailer weight rating30,000 lb
FinishRaw steel
Part number40085

Where the files are

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

Lippert (CURT)CURT 2-5/16" Trailer Ball (1-1/4" x 2-5/8" Shank, 30,000 lbs.) #40085webPublisher's page; dimensions are facts

Free files

★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

curt-trailer-ball-40085-ballBall Ø58.74 mmSTEP · STL
curt-trailer-ball-40085-shankShank Ø31.75 × 66.67 mm (collar, rise and thread not published, not modelled)STEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=curt-trailer-ball-40085

CURT 40085 trailer ball (2-5/16 in ball, 1-1/4 × 2-5/8 in shank, 30,000 lb), isometric render of a generated part
Render of curt-trailer-ball-40085-shank from the free STEP; not to scale.

Fits with

CURT 40015 trailer ball (1-7/8 in ball, 3/4 × 2-1/8 in shank, 2,000 lb), isometric render of a generated part
CURT 40015 trailer ball (1-7/8 in ball, 3/4 × 2-1/8 in shank, 2,000 lb)47.62×47.62 mm★ 2 files
CURT 40161 trailer ball (1-7/8 in ball, 3/4 × 1-5/8 in shank, 2,000 lb), isometric render of a generated part
CURT 40161 trailer ball (1-7/8 in ball, 3/4 × 1-5/8 in shank, 2,000 lb)47.62×47.62 mm★ 2 files
CURT 40002 trailer ball (1-7/8 in ball, 1 × 2-1/8 in shank, 3,500 lb), isometric render of a generated part
CURT 40002 trailer ball (1-7/8 in ball, 1 × 2-1/8 in shank, 3,500 lb)47.62×47.62 mm★ 2 files
CURT 40072 trailer ball (1-7/8 in ball, 1 × 3 in shank, 3,500 lb), isometric render of a generated part
CURT 40072 trailer ball (1-7/8 in ball, 1 × 3 in shank, 3,500 lb)47.62×47.62 mm★ 2 files

Questions

What size is CURT trailer ball 40085?

2-5/16 in ball (58.74 mm), 1-1/4 in × 2-5/8 in shank (31.75 mm × 66.67 mm), 30,000 lb.