# Rubber buffers GN 351 / GN 451 (cylindrical rubber-metal mounts): diameter, height, thread M3 to M16, stud length, male-male and female forms + STEP/STL

> What are the dimensions of a cylindrical rubber buffer or vibration mount such as GN 351: diameter, height, thread size, stud length and thread depth?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: Ganter GN 351 table (read from its ordering codes), five reseller product pages (four agree on every column, one differs on stud length), GN 451 from a single Winco listing
- Page: https://xemstudio.com/objects/rubber-buffers-gn-351-gn-451/ · JSON: https://xemstudio.com/api/geometry?object=rubber-buffers-gn-351-gn-451 · Plain text: https://xemstudio.com/objects/rubber-buffers-gn-351-gn-451/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.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- GN 351 rubber buffers are cylindrical rubber-to-metal anti-vibration mounts (rubber bumper, rubber foot, vibration isolator, cylindrical mount): a natural rubber body bonded to steel cover plates, with a threaded stud or a threaded hole on each end. Form SS has a stud on both ends (male-male, 'external thread both sides'), ES has a hole on one end and a stud on the other (female-male), EE has a hole on both ends (female-female). Natural rubber, 40 / 55 / 70 Shore A (soft, medium, hard); GN 451 is the same family in stainless steel with a different part number and is listed on Ganter's own page, not in the table read here.
- Table: Ganter's GN 351 page, read from its ordering codes (the grid is flattened, so the heights per form are rebuilt from the codes GN 351-d1-h-thread-form-hardness). Check: five SS-70 reseller product pages (Elsinghorst) agree with Ganter on d1, h, thread, l, s and t for 20 × 15 (M6), 40 × 20 (M8), 50 × 40 (M10) and 100 × 40 (M16). One disagreement: 70 × 45 M10: the reseller prints l 27, Ganter's table row for d1 70 prints l 28 (s 3, t 10 on both). Both are shown; the file set does not include that size.
- Where the table has two M-rows for the same d1 (40 mm with M8 and M10), the thread is part of the row. The 16 mm size has only EE heights (15, 20) and no stud length printed. Hardness does not change dimensions: every code is offered in 40, 55 and 70 Shore A.
- GN 451.1 (stainless, inch thread): only one listing was read (J.W. Winco, 1/4-20, 1.26 in diameter, 3/4 in high, 0.51 in stud). Treat it as a single-source example, not a table.
- Files: four SS (male-male) envelope models at the sizes confirmed by a reseller's product page: rubber body Ø d1 × h with an Mx stud of length l on each end (plain cylinders at the nominal major diameter). Cover plate thickness s is inside the body, not drawn separately. The female forms (ES, EE) have a threaded hole of depth t; the hole is not modelled. Mass, stiffness and load capacity are in Ganter's catalog (not read), so none are claimed.
- Left out: weights, spring rates and the full height range for ES and EE as separate files; GN 351 variants with a through hole (the Ganter quick-finder lists 'GN 351 ... with through-hole and cover plate'); other makers' mounts (Paulstra, Misumi).

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| stud d2 | M3 to M16 (per diameter) | tapped hole of the same thread (ISO coarse), depth at least the stud length l | designed | rubber-buffer* |
| thread depth t (female forms) | 3 to 16 mm | stud or screw of the same thread, engagement not over t | designed | all |
| rubber body d1 | Ø6 to Ø125 | plate or frame: keep the body free (the rubber bulges under load) | designed | rubber-buffer* |

## Sizes

| d1 rubber Ø, mm | thread d2 | stud length l, mm | cover plate s, mm | thread depth t (female), mm | height h, form EE (female-female), mm | height h, form ES (female-male), mm | height h, form SS (male-male), mm |
|---|---|---|---|---|---|---|---|
| 6 | M3 | 6 | 0.8 | 3 | — | 7 | — |
| 8 | M3 | 6 | 1 | 3 | 8, 13 | 8, 13 | 8, 13 |
| 10 | M4 | 10 | 1.2 | 4 | 10, 15, 20 | 10, 15, 20 | 10, 15, 20 |
| 15 | M4 | 10 | 1.4 | 4 | 10, 15, 20 | 10, 15, 20, 25, 30 | 8, 10, 15, 20, 25 |
| 16 | M5 | — | 1.7 | 5 | 15, 20 | — | — |
| 20 | M6 | 18 | 2 | 6 | 15, 20, 25 | 15, 20, 25, 30 | 8.5, 15, 20, 25, 30 |
| 25 | M6 | 18 | 2 | 6 | 20, 25, 30 | 15, 20, 30 | 10, 15, 20, 25, 30 |
| 30 | M8 | 20 | 2 | 8 | 20, 25, 30, 40 | 15, 20, 25, 30, 40 | 15, 20, 25, 30, 40 |
| 40 | M8 | 23 | 2 | 8 | 20, 30, 40 | 20, 30, 40 | 20, 30, 40, 45 |
| 40 | M10 | 23 | 2 | 8 | — | 20, 28, 35, 40 | 20, 25 |
| 50 | M10 | 28 | 2 | 10 | 30, 35, 40, 50 | 20, 25, 30, 35, 40, 45, 50 | 20, 25, 30, 35, 40, 45, 50 |
| 60 | M10 | 28 | 2 | 10 | 30, 40, 50 | 30, 35, 40, 50 | 30, 40, 50 |
| 70 | M10 | 28 | 3 | 10 | 30, 35, 45, 50 | 30, 45, 50, 70 | 30, 35, 45 |
| 75 | M12 | 37 | 3 | 12 | 30, 40, 50, 55 | 25, 40, 45, 50, 55 | 25, 40, 50, 55 |
| 100 | M16 | 41 | 3 | 16 | 40, 55, 60, 75 | 40, 55, 60, 75 | 40, 55, 60, 75 |
| 125 | M16 | 41 | 3 | 16 | 55, 75 | 55, 75 | 55, 75 |
| 32 (1.26 in), GN 451.1 stainless, inch thread | 1/4-20 | 0.51 in (13 mm) stud | — | — | — | — | 19 mm (3/4 in) high; single source (Winco listing) |

## Where the files are

- Ganter Norm: [GN 351 rubber buffers, steel: d1, h by form (EE, ES, SS), d2, l, s, t, hardness 40 / 55 / 70 Shore A](https://www.ganternorm.com/en/products/quick-finder/GN-351-Rubber-buffers-Steel?q=GN+351) — web — Publisher's page; dimensions are facts
- Elsinghorst (Ganter reseller): [GN 351-20-15-M6-SS-70: d1 20, h 15, l 18, s 2, t 6](https://www.ehorst.de/en/Gummipuffer-GN-351-20-15-M6-SS-70-Aussengewinde-beidseitig-70-Shore-A-1200983.html) — web — Publisher's page; dimensions are facts
- Elsinghorst (Ganter reseller): [GN 351-40-20-M8-SS-70: d1 40, h 20, l 23, s 2, t 8](https://www.ehorst.de/en/Gummipuffer-GN-351-40-20-M8-SS-70-Aussengewinde-beidseitig-70-Shore-A-1201043.html) — web — Publisher's page; dimensions are facts
- Elsinghorst (Ganter reseller): [GN 351-50-40-M10-SS-70: d1 50, h 40, l 28, s 2, t 10](https://www.ehorst.de/en/Gummipuffer-GN-351-50-40-M10-SS-70-Aussengewinde-beidseitig-70-Shore-A-1201098.html) — web — Publisher's page; dimensions are facts
- Elsinghorst (Ganter reseller): [GN 351-70-45-M10-SS-70: d1 70, h 45, l 27, s 3, t 10 (Ganter's own table: l 28)](https://www.ehorst.de/en/Gummipuffer-GN-351-70-45-M10-SS-70-Aussengewinde-beidseitig-70-Shore-A-1201134.html) — web — Publisher's page; dimensions are facts
- Elsinghorst (Ganter reseller): [GN 351-100-40-M16-SS-70: d1 100, h 40, l 41, s 3, t 16](https://www.ehorst.de/en/Gummipuffer-GN-351-100-40-M16-SS-70-Aussengewinde-beidseitig-70-Shore-A-1200914.html) — web — Publisher's page; dimensions are facts
- Zoro (J.W. Winco listing): [GN 451.1-32-19-1/4x20-55 stainless buffer: 1.26 in diameter, 3/4 in height, stud 0.51 in, 1/4-20](https://www.zoro.com/jw-winco-gn4511-32-19-14x20-55-rubber-bumper-stainless-threaded-studs-4511-32-19-14-55/i/G4672817/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (4 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/index.json

- rubber-buffer-gn-351-ss-d20x15-m6: [STEP](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d20x15-m6.step) · [STL](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d20x15-m6.stl) — GN 351 rubber buffer, form SS (male thread both ends): rubber body Ø20 × 15 mm, studs M6 × 18 mm each end (plain cylinders at the nominal major diameter); cover plates (2 mm thick) are inside the body envelope, not separate; nominal values; overall length h + 2 l = 51 mm (stud length l is Ganter's printed value, the drawing's exact stud/plate split is not published as numbers)
- rubber-buffer-gn-351-ss-d40x20-m8: [STEP](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d40x20-m8.step) · [STL](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d40x20-m8.stl) — GN 351 rubber buffer, form SS (male thread both ends): rubber body Ø40 × 20 mm, studs M8 × 23 mm each end (plain cylinders at the nominal major diameter); cover plates (2 mm thick) are inside the body envelope, not separate; nominal values; overall length h + 2 l = 66 mm (stud length l is Ganter's printed value, the drawing's exact stud/plate split is not published as numbers)
- rubber-buffer-gn-351-ss-d50x40-m10: [STEP](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d50x40-m10.step) · [STL](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d50x40-m10.stl) — GN 351 rubber buffer, form SS (male thread both ends): rubber body Ø50 × 40 mm, studs M10 × 28 mm each end (plain cylinders at the nominal major diameter); cover plates (2 mm thick) are inside the body envelope, not separate; nominal values; overall length h + 2 l = 96 mm (stud length l is Ganter's printed value, the drawing's exact stud/plate split is not published as numbers)
- rubber-buffer-gn-351-ss-d100x40-m16: [STEP](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d100x40-m16.step) · [STL](https://xemstudio.com/files/hardware/rubber-buffers-gn-351-gn-451/rubber-buffer-gn-351-ss-d100x40-m16.stl) — GN 351 rubber buffer, form SS (male thread both ends): rubber body Ø100 × 40 mm, studs M16 × 41 mm each end (plain cylinders at the nominal major diameter); cover plates (3 mm thick) are inside the body envelope, not separate; nominal values; overall length h + 2 l = 122 mm (stud length l is Ganter's printed value, the drawing's exact stud/plate split is not published as numbers)

## Questions

**What size is a GN 351 20 × 15 M6 rubber buffer?**

Rubber Ø20 × 15 high, M6 stud 18 mm long each end (form SS), cover plate 2 mm, thread depth 6 mm on the female forms.

**What does SS / ES / EE mean?**

SS: studs both ends (male-male); ES: hole one end, stud the other (female-male); EE: holes on both ends (female-female).

**What thread does a Ø50 rubber buffer have?**

M10, stud length 28 mm, thread depth 10 mm; heights 20 to 50 mm depending on form.

**What shore hardness is available?**

40, 55 and 70 Shore A, natural rubber; the dimensions are the same for all three.

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