# Oil seal housing and shaft (DIN 3760): bore H8, shaft h11, lead-in chamfers, groove, roughness and hardness

> What housing bore tolerance, shaft tolerance, chamfer and surface finish does a radial shaft seal (oil seal) need?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: DICHTA's rotary shaft seal brochure and catalogue (H8 / h11 tables, chamfers, roughness, hardness, contact band), Seals-Shop's installation guide (groove and shaft-end chamfer tables), Tameson's manual and the ISO 6194-1:1982 sample, compared; numbers only
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**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

- Housing: bore tolerance H8 for metric seals (DIN 3760) in all three maker documents; the table lists the H8 band by bore range (to 250 mm). The ranges from 250 mm up are left out: DICHTA's figure for 250 to 315 mm (+0.084) and the general ISO 286 page read for comparison disagreed there. Shaft: h11 by shaft range (to 250 mm), same table source. Both tables are DICHTA's, quoting DIN 3760; the bands up to 30 mm agree with a general ISO 286 table read for comparison (cadforum.cz).
- Where the makers differ the rows show both: housing bore roughness, housing lead-in angle (10° to 20° against 5° to 10°), shaft hardness (45 or 55 HRC base) and shaft Rz. Follow the seal maker's datasheet for the seal you buy.
- Shaft-end chamfer table (Seals-Shop): headings 'Chamfer length for shaft end', d1, d3, R, with d3 given as d1 minus a value and R as 2 to 12; the page does not define d3 or R (its figure is not in the text), so they are shown as printed. DICHTA's rule is a 15° to 30° chamfer with a rounded and polished edge.
- Housing groove: Seals-Shop's table (b, b1 = 0.85 × b, b2 = b + 0.3, r2 max) for ring widths 7, 8, 10, 12, 15 and 20 mm; DICHTA prints the same b, t1 min = 0.85 × b, t2 min = b + 0.3 and r2 max 0.5 / 0.7 without saying which type it covers. Neither source says which of b1 / b2 or t1 / t2 is the depth; do not read them as one.
- Not tabulated: the width tolerance and the outside-diameter tolerance of the seal (the ISO 6194-1:1982 sample text was too scrambled to read); inch-series (TCM, CR) housings; pressure and speed limits (they depend on the seal).
- No file: every figure here is a tolerance, finish or rule; a housing drawn from them would need a choice of seat depth the sources do not fix. Seal sizes: radial-shaft-seals-din-3760-iso-6194 (with case envelopes).

## 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 |
|---|---|---|---|---|
| seat bore | Ø D, tolerance H8 | seal outside diameter D (radial-shaft-seals-din-3760-iso-6194) | press | all |
| shaft | Ø d, tolerance h11 | seal lip contact bore d | run | all |
| groove width | b2 = b + 0.3 mm, r2 max 0.5 (b 7 to 10) or 0.7 (b 12 to 20) | seal width b | designed | all |

## Sizes

| item | range / size | value | second value or R | source note |
|---|---|---|---|---|
| housing bore H8 (DIN 3760) | bore 10 to 18 mm | +0.027 / 0 mm | DICHTA brochure table | — |
| housing bore H8 (DIN 3760) | bore 18 to 30 mm | +0.033 / 0 mm | DICHTA brochure table | — |
| housing bore H8 (DIN 3760) | bore 30 to 50 mm | +0.039 / 0 mm | DICHTA brochure table | — |
| housing bore H8 (DIN 3760) | bore 50 to 80 mm | +0.046 / 0 mm | DICHTA brochure table | — |
| housing bore H8 (DIN 3760) | bore 80 to 120 mm | +0.054 / 0 mm | DICHTA brochure table | — |
| housing bore H8 (DIN 3760) | bore 120 to 180 mm | +0.063 / 0 mm | DICHTA brochure table | — |
| housing bore H8 (DIN 3760) | bore 180 to 250 mm | +0.072 / 0 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 6 to 10 mm | 0 / -0.090 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 10 to 18 mm | 0 / -0.110 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 18 to 30 mm | 0 / -0.130 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 30 to 50 mm | 0 / -0.160 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 50 to 80 mm | 0 / -0.190 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 80 to 120 mm | 0 / -0.220 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 120 to 180 mm | 0 / -0.250 mm | DICHTA brochure table | — |
| shaft h11 (DIN 3760) | shaft 180 to 250 mm | 0 / -0.290 mm | DICHTA brochure table | — |
| shaft-end chamfer table (Seals-Shop) | d1 < 10 mm | d3 = d1 - 1.5 | R = 2 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 10 to 20 mm | d3 = d1 - 2.0 | R = 2 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 20 to 30 mm | d3 = d1 - 2.5 | R = 3 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 30 to 40 mm | d3 = d1 - 3.0 | R = 3 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 40 to 50 mm | d3 = d1 - 3.5 | R = 4 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 50 to 70 mm | d3 = d1 - 4.0 | R = 4 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 70 to 95 mm | d3 = d1 - 4.5 | R = 5 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 95 to 130 mm | d3 = d1 - 5.5 | R = 6 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 130 to 240 mm | d3 = d1 - 7.0 | R = 8 | headings d1, d3, R as printed; the page does not define the letters |
| shaft-end chamfer table (Seals-Shop) | d1 over 240 to 500 mm | d3 = d1 - 11.0 | R = 12 | headings d1, d3, R as printed; the page does not define the letters |
| housing groove (Seals-Shop) | ring width b = 7 mm | b1 (0.85 × b) = 5.95; b2 (b + 0.3) = 7.3 | r2 max = 0.5 | DICHTA prints the same pattern as t1 min = 0.85 × b, t2 min = b + 0.3 with r2 max 0.5 / 0.7 |
| housing groove (Seals-Shop) | ring width b = 8 mm | b1 (0.85 × b) = 6.80; b2 (b + 0.3) = 8.3 | r2 max = 0.5 | DICHTA prints the same pattern as t1 min = 0.85 × b, t2 min = b + 0.3 with r2 max 0.5 / 0.7 |
| housing groove (Seals-Shop) | ring width b = 10 mm | b1 (0.85 × b) = 8.50; b2 (b + 0.3) = 10.3 | r2 max = 0.5 | DICHTA prints the same pattern as t1 min = 0.85 × b, t2 min = b + 0.3 with r2 max 0.5 / 0.7 |
| housing groove (Seals-Shop) | ring width b = 12 mm | b1 (0.85 × b) = 10.30; b2 (b + 0.3) = 12.3 | r2 max = 0.7 | DICHTA prints the same pattern as t1 min = 0.85 × b, t2 min = b + 0.3 with r2 max 0.5 / 0.7 |
| housing groove (Seals-Shop) | ring width b = 15 mm | b1 (0.85 × b) = 12.75; b2 (b + 0.3) = 15.3 | r2 max = 0.7 | DICHTA prints the same pattern as t1 min = 0.85 × b, t2 min = b + 0.3 with r2 max 0.5 / 0.7 |
| housing groove (Seals-Shop) | ring width b = 20 mm | b1 (0.85 × b) = 17.00; b2 (b + 0.3) = 20.3 | r2 max = 0.7 | DICHTA prints the same pattern as t1 min = 0.85 × b, t2 min = b + 0.3 with r2 max 0.5 / 0.7 |
| housing bore tolerance | metric seals | ISO H8 (press fit) | DICHTA, Seals-Shop, Tameson agree | Seals-Shop: soft or thin-walled housings may need a special fit found by trial; inch sizes follow American standards, no value given |
| housing bore roughness | — | Ra 1.6 to 6.3 µm, Rz 10 to 20 µm, Rmax 25 µm (DICHTA); Ra 1.6 to 6.3, Rz 10 to 20, Rmax 16 to 25 (Seals-Shop, citing ISO 6194/1) | Rmax max 16 µm (Tameson); Ra max 3.2, Rmax 12.5 (ISO 6194-1:1982 sample) | four values for the same quantity: use the seal maker's |
| housing lead-in chamfer | — | 10° to 20°, depth per ring thickness (DICHTA) | 5° to 10°, length not given (Tameson) | the two sources disagree; Seals-Shop gives no housing chamfer |
| shaft tolerance | — | ISO h11 (DICHTA, Tameson, ISO 6194-1:1982 sample, clause 7.2 'shall not exceed h11') | — | Seals-Shop prints no shaft tolerance |
| shaft lead-in | — | 15° to 30° chamfer, edge rounded and polished (DICHTA) | 1 mm radius, or chamfer per DIN (Tameson); table above (Seals-Shop) | no machining swirl on the running surface (Tameson, Seals-Shop) |
| shaft surface roughness | — | Ra 0.2 to 0.8 µm, Rz 1 to 5 µm, Rmax 6.3 µm (DICHTA); Ra 0.2 to 0.8, Rz 1 to 4, Rmax 6.3 (Seals-Shop) | Rt 1 to 4 µm (Tameson) | Rz upper limit 4 or 5 µm by source |
| shaft hardness | — | 45 HRC min (DIN 3760); 55 HRC at 4 m/s; 60 HRC at 10 m/s; 0.3 mm depth if not through-hardened (DICHTA) | 55 HRC or 600 HV, 0.3 mm min depth (Seals-Shop); 45 HRC, 55 HRC for contamination or above 4 m/s (Tameson) | sources disagree on the base value (45 or 55 HRC) |
| contact band width (DIN 3761 part 4) | shaft up to 50 mm | front band 1.2 mm, back band 0.5 mm | — | DICHTA |
| contact band width (DIN 3761 part 4) | shaft 50 to 120 mm | front band 1.5 mm, back band 0.8 mm | — | DICHTA |
| contact band width (DIN 3761 part 4) | shaft over 120 mm | front band 2 mm, back band 1 mm | — | DICHTA |

## Where the files are

- DICHTA (rotary shaft seals brochure, distributed by MM Intercom): [Rotary shaft seals: H8 and h11 tolerance tables by diameter range, chamfer angles, shaft roughness and hardness, contact band width (DIN 3761 part 4)](https://mmintercom.com/upload/catalog/product/51441/dichta rotary shaft seals.pdf) — web — Publisher's page; dimensions are facts
- DICHTA (catalogue, distributed by MM Intercom): [Technical and sealing product catalogue: rotary shaft seals to DIN 3760, installation (housing H8, shaft h11, chamfers, roughness, hardness, groove)](https://mmintercom.com/upload/publish/130/DICHTA Technical and Sealing Product Catalogue.pdf) — web — Publisher's page; dimensions are facts
- Seals-Shop GmbH: [Installation guide, radial oil seal: housing dimensions, shaft-end chamfer table, shaft surface and hardness, installation rules](https://www.seals-shop.com/content/medias/installation_guides/en/IG_Radial%20oil%20seal_EN.pdf) — web — Publisher's page; dimensions are facts
- Tameson: [Rotary shaft seals: installation (housing H8, shaft h11, lead-in, roughness, hardness)](https://storage.tameson.com/asset/Products/Manuals/EN/rotary-shaft-seals.pdf) — web — Publisher's page; dimensions are facts
- ISO / iTeh Standards: [ISO 6194-1:1982 Rotary shaft lip type seals, Part 1: nominal dimensions and tolerances (free sample pages)](https://cdn.standards.iteh.ai/samples/12453/30d2071c361441c4a5e8efc405fdf859/ISO-6194-1-1982.pdf) — web — Standard sample pages; dimensions are facts

## Questions

**What bore tolerance does an oil seal housing need?**

ISO H8 for metric seals (DIN 3760): +0.027 / 0 mm for a 10 to 18 mm bore, +0.033 for 18 to 30, +0.039 for 30 to 50, +0.046 for 50 to 80 mm (DICHTA); Seals-Shop and Tameson also name H8.

**What shaft tolerance and finish for a radial shaft seal?**

Shaft h11 (for example 0 / -0.130 mm for 18 to 30 mm), Ra 0.2 to 0.8 µm, Rmax 6.3 µm, no machining swirl. Hardness is 45 HRC or more in DIN 3760 per DICHTA, 55 HRC per Seals-Shop; both sources agree on a 0.3 mm hardness depth.

**What chamfer should a shaft have for an oil seal?**

DICHTA: 15° to 30°, edge rounded and polished. Seals-Shop's table gives the end diameter d3 = d1 - 1.5 for shafts under 10 mm up to d1 - 11 over 240 mm (letters as printed). Tameson: 1 mm radius or a DIN chamfer.

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