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RAM-style mount ball sizes: A 0.56, B 1, C 1.5, D 2.25 and E 3.38 in
What size is a RAM mount ball? · Standard part · basis: RAM Mounts: the letter after RAM names the ball size, A 0.56 in, B 1 in, C 1.5 in, D 2.25 in, E 3.38 in
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 5 in table
Notes
- RAM mounts join with a rubber ball on the base and a double-socket arm that clamps two balls. The letter in a RAM part number is the ball size; C-size parts carry no letter.
- Files: each ball as a sphere at the published diameter. The ball is the interface; the neck and base under it differ from part to part and are not drawn. Union a ball onto your own base to mate with a RAM arm of that size.
- Ball diameters are given in inches by RAM; the mm figures are the exact conversions. The rubber ball is drawn as a rigid sphere at its published size.
Sizes
| size | ball (in) | ball (mm) | used for (RAM) |
|---|---|---|---|
| A | 0.56 | 14.224 | action cameras and other very light gear |
| B | 1 | 25.400 | phones, GPS units, small tablets |
| C | 1.5 | 38.100 | large tablets, fish finders, rough rides |
| D | 2.25 | 57.150 | rugged tablets, laptops, heavy equipment |
| E | 3.38 | 85.852 | large displays, aviation and industrial use |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| ball | Ø14.224 / 25.4 / 38.1 / 57.15 / 85.852 (A–E) | RAM-style double-socket arm of the same size | socket | ram-ball-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| RAM Mounts | Ball sizes by letter: A 0.56 in, B 1 in, C 1.5 in, D 2.25 in, E 3.38 in (RAM-D-202U page) | web | manufacturer page verify |
Free files
★ Free files 5 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| ram-ball-a-0.56in | RAM-style A size ball: Ø0.56 in = Ø14.224 mm sphere (the ball only; the base or arm it sits on differs per part) | STEP · STL |
| ram-ball-b-1in | RAM-style B size ball: Ø1 in = Ø25.400 mm sphere (the ball only; the base or arm it sits on differs per part) | STEP · STL |
| ram-ball-c-1.5in | RAM-style C size ball: Ø1.5 in = Ø38.100 mm sphere (the ball only; the base or arm it sits on differs per part) | STEP · STL |
| ram-ball-d-2.25in | RAM-style D size ball: Ø2.25 in = Ø57.150 mm sphere (the ball only; the base or arm it sits on differs per part) | STEP · STL |
| ram-ball-e-3.38in | RAM-style E size ball: Ø3.38 in = Ø85.852 mm sphere (the ball only; the base or arm it sits on differs per part) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=ram-mount-ball-sizes
How it fits
Connects to
Handlebar clamp ringsa ball unioned onto a bar clampAlternatives
17 mm ball joint for phone mounts17 mm ball of clip-on phone holdersYou might also need
Questions
What size is a RAM B ball?
1 in (25.4 mm). A is 0.56 in, C 1.5 in, D 2.25 in, E 3.38 in.
Do RAM B and C parts fit each other?
Not directly: a B arm clamps 1 in balls, a C arm 1.5 in balls.
Is a RAM B ball the same as a phone holder ball?
No: clip-on phone holders use a 17 mm ball; RAM B is 25.4 mm.