Standard Bonded Seal
Metal washer with vulcanised elastomer element. The seal is positioned during installation.
View dimensions →
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NORWEGIAN INDUSTRIAL SUPPLIER · DISTRIBUTORS & OEMs
Bonded Seals for Distributors & OEMs
STEMA AS supplies Bonded Seals (often called Dowty seals) and self-centring sealing washers for industrial distributors, hydraulic suppliers and OEM customers. Find Standard, Self-Centring and GS seals by size, reference and dimension, and request a quotation for your purchasing requirements.
Metal washer + elastomerCompact static seal
ELASTOMER / RUBBERNBR · FKM (Viton) · HNBR · EPDM
METAL WASHERZinc-plated carbon steel · Stainless steel AISI 316
See material information →STEMA DIMENSION CATALOGUE
Bonded Seal Size Chart – BSP, Metric & GS
Search directly by size, reference or dimension.
Self-Centring BSP
Datasheet · page 4 · mm
| Ref. | BSP | Bolt | C +0.10/-0.00 | A +0.13/-0.00 | B ±0.10 | D | E | F +0.00/-0.20 | Inquiry |
|---|---|---|---|---|---|---|---|---|---|
| 820 | 1/8 | 3/8 | 10.37 | 15.88 | 11.84 | — | — | 8.56 | Request quote → |
| 821 | 1/4 | 1/2 | 13.74 | 20.57 | 15.21 | — | 2.03 | 11.45 | Request quote → |
| 823 | 3/8 | - | 17.28 | 23.80 | 18.75 | — | 2.18 | 14.96 | Request quote → |
| 825 | 1/2 | 13/16 | 21.54 | 28.58 | 23.01 | 0.35 | — | 18.64 | Request quote → |
| 826 | 5/8 | 7/8 | 23.49 | 31.75 | 24.97 | 0.51 | 2.34 | 20.60 | Request quote → |
| 827 | 3/4 | 1 | 27.05 | 34.93 | 28.53 | — | 2.60 | 24.13 | Request quote → |
| 829 | 7/8 | 1 3/16 | 30.81 | 38.10 | 32.29 | — | — | 27.89 | Request quote → |
| 830 | 1 | 1 5/16 | 33.89 | 42.80 | 36.88 | — | — | 30.30 | Request quote → |
| 832 | 1 1/4 | 1 5/8 | 42.93 | 52.38 | 45.93 | — | 3.25 | 38.96 | Request quote → |
| 833 | 1 1/2 | 1 7/8 | 48.44 | 58.60 | 51.39 | — | 3.51 | 44.86 | Request quote → |
| 836 | 2 | - | 60.58 | 73.03 | 63.63 | — | — | 56.67 | Request quote → |
Imperial Bonded Seals
Datasheet · page 5 · mm
| Ref. | BSP | Bolt | C ±0.13 | A +0.13/-0.00 | B ±0.13 | D | E | Inquiry |
|---|---|---|---|---|---|---|---|---|
| 001 | — | 6BA | 3.05 | 6.35 | 4.09 | — | — | Request quote → |
| 002 | — | 4BA | 4.12 | 7.26 | 5.26 | — | — | Request quote → |
| 003 | — | 2BA | 5.21 | 8.38 | 6.35 | — | — | Request quote → |
| 004 | — | 1/4 | 6.86 | 13.21 | 8.00 | 0.2/0.38 | 1.22/1.37 | Request quote → |
| 005 | — | 1/4 | 6.99 | 13.34 | 9.53 | — | — | Request quote → |
| 006 | — | 5/16 | 8.31 | 13.34 | 9.53 | — | — | Request quote → |
| 007 | — | 5/16 | 8.64 | 14.22 | 10.04 | — | — | Request quote → |
| 020 | 1/8 | 3/8 | 10.37 | 15.88 | 11.84 | — | — | Request quote → |
| 008 | — | 0.4 | 11.26 | 18.36 | 12.45 | — | — | Request quote → |
| 009 | — | 7/16 | 11.69 | 19.05 | 13.08 | — | — | Request quote → |
| 021 | 1/4 | 1/2 | 13.74 | 20.57 | 15.21 | — | 2.03/2.18 | Request quote → |
| 010 | — | 9/16 | 14.86 | 22.23 | 16.39 | — | — | Request quote → |
| 022 | — | 0.6 | 15.83 | 22.23 | 17.30 | — | — | Request quote → |
| 011 | — | 5/8 | 16.51 | 25.40 | 18.75 | — | — | Request quote → |
| 023 | 3/8 | — | 17.28 | 23.80 | 18.75 | — | — | Request quote → |
| 012 | — | 11/16 | 18.16 | 25.40 | 19.69 | — | — | Request quote → |
| 024 | — | 3/4 | 19.69 | 26.92 | 21.21 | — | — | Request quote → |
| 025 | 1/2 | 13/16 | 21.54 | 28.58 | 23.01 | — | — | Request quote → |
| 026 | 5/8 | 7/8 | 23.49 | 31.75 | 24.97 | — | — | Request quote → |
| 013 | — | 15/16 | 24.26 | 33.27 | 26.04 | 0.25/0.51 | 2.34/2.60 | Request quote → |
| 027 | 3/4 | 1 | 27.05 | 34.93 | 28.53 | — | — | Request quote → |
| 028 | — | 1 1/16 | 27.82 | 38.61 | 30.61 | — | — | Request quote → |
| 014 | — | 1 1/8 | 29.33 | 36.58 | 30.86 | — | — | Request quote → |
| 029 | 7/8 | 1 3/16 | 30.81 | 38.10 | 32.29 | — | — | Request quote → |
| 015 | — | 1 1/4 | 32.64 | 41.40 | 35.69 | — | — | Request quote → |
| 030 | 1 | 1 5/16 | 33.89 | 42.80 | 36.88 | — | — | Request quote → |
| 031 | 1 | 1 5/16 | 33.89 | 42.80 | 36.88 | — | — | Request quote → |
| 016 | — | 1 3/8 | 35.94 | 44.45 | 38.99 | — | — | Request quote → |
| 017 | — | 1 1/2 | 38.96 | 47.75 | 42.04 | — | — | Request quote → |
| 032 | 1 1/4 | 1 5/8 | 42.93 | 52.38 | 45.93 | — | — | Request quote → |
| 018 | — | 1 3/4 | 45.34 | 57.15 | 48.39 | — | — | Request quote → |
| 033 | 1 1/2 | 1 7/8 | 48.44 | 58.60 | 51.39 | — | 3.25/3.51 | Request quote → |
| 019 | — | 2.0 | 51.69 | 63.50 | 54.74 | — | — | Request quote → |
| 034 | 1 3/4 | 2 1/8 | 54.89 | 69.85 | 58.30 | — | — | Request quote → |
| 035 | — | 2 1/4 | 58.04 | 70.36 | 61.09 | — | — | Request quote → |
| 036 | 2 | — | 60.58 | 73.03 | 63.63 | — | — | Request quote → |
| 037 | — | 2 1/2 | 64.39 | 77.72 | 67.44 | — | — | Request quote → |
| 038 | 2 1/4 | — | 66.68 | 79.50 | 69.98 | — | — | Request quote → |
| 039 | 2 1/2 | — | 76.08 | 90.17 | 79.38 | — | — | Request quote → |
| 079 | 3 | — | 89.09 | 101.47 | 92.84 | — | — | Request quote → |
German metric
Datasheet · page 6 · mm
| Thread ref. | Size ref. | C +0.10 | A +0.13/-0.00 | B ±0.13 | D +0.25/-0.00 | E | Inquiry |
|---|---|---|---|---|---|---|---|
| M4 | 202 | 4.5 | 7.00 | 5.40 | — | — | Request quote → |
| M5 | 203 | 5.70 | 9.00 | 6.80 | — | — | Request quote → |
| M5.5 | 205 | 6.20 | 9.2 | 7.20 | — | — | Request quote → |
| M6 | 206 | 6.70 | 10.00 | 8.00 | 0.30 | 0.90 | Request quote → |
| M6 | 207 | 6.70 | 11.00 | 8.20 | — | 1.10 | Request quote → |
| M8 | 212 | 8.70 | 13.00 | 10.00 | — | — | Request quote → |
| M8 | 213 | 8.70 | 14.00 | 10.40 | — | — | Request quote → |
| M10 | 217 | 10.70 | 16.00 | 12.40 | — | — | Request quote → |
| M10 | 218 | 10.70 | 18.00 | 12.40 | — | — | Request quote → |
| M11 | 221 | 11.80 | 19.10 | 13.50 | — | — | Request quote → |
| M12 | 222 | 12.70 | 18.00 | 14.40 | — | — | Request quote → |
| M12 | 223 | 12.70 | 20.00 | 14.00 | — | — | Request quote → |
| M13 | 225 | 13.70 | 22.00 | 15.40 | — | 1.40 | Request quote → |
| M14 | 227 | 14.70 | 22.00 | 16.40 | — | 1.60 | Request quote → |
| M16 | 229 | 16.70 | 24.00 | 18.40 | — | — | Request quote → |
| M17 | 230 | 17.40 | 24.00 | 19.20 | 0.40 | — | Request quote → |
| M17.5 | 231 | 18.00 | 24.70 | 20.10 | — | — | Request quote → |
| M18 | 232 | 18.70 | 26.00 | 20.40 | — | — | Request quote → |
| M20 | 233 | 20.70 | 28.00 | 22.50 | — | — | Request quote → |
| M21 | 234 | 21.50 | 28.70 | 23.30 | — | 2.35/2.65 | Request quote → |
| M22 | 236 | 22.70 | 30.00 | 24.40 | — | 1.90/2.10 | Request quote → |
| M24 | 238 | 24.70 | 32.00 | 26.40 | — | — | Request quote → |
| M26 | 239 | 26.70 | 35.00 | 28.40 | — | 1.90 | Request quote → |
| M27 | 240 | 27.20 | 36.00 | 29.00 | — | 2.10 | Request quote → |
| M33 | 243 | 33.70 | 42.00 | 35.80 | — | — | Request quote → |
| M33 | 244 | 34.30 | 43.00 | 36.40 | — | — | Request quote → |
| M42 | 247 | 42.70 | 53.00 | 44.00 | — | 2.85 | Request quote → |
| M48 | 248 | 48.70 | 59.00 | 50.80 | — | 3.15 | Request quote → |
French metric
Datasheet · page 7 · mm
| Thread ref. | Size ref. | C +0.10 | A +0.13/-0.00 | B ±0.10 | D +0.25/-0.00 | E | Inquiry |
|---|---|---|---|---|---|---|---|
| M4 | 302 | 4.60 | 9 | 6.00 | — | — | Request quote → |
| M5 | 303 | 5.60 | 10 | 7.00 | — | 0.90 | Request quote → |
| M6 | 304 | 6.60 | 11 | 8.00 | — | 1.10 | Request quote → |
| M6 | 306 | 7.00 | 11.4 | 8.40 | 0.30 | — | Request quote → |
| M8 | 307 | 8.60 | 13 | 10.00 | — | — | Request quote → |
| M10 | 310 | 10.70 | 17 | 12.10 | — | — | Request quote → |
| M12 | 313 | 12.70 | 19 | 14.10 | — | 1.40 | Request quote → |
| M13 | 315 | 13.80 | 20.10 | 15.20 | 0.40 | 1.60 | Request quote → |
| M14 | 316 | 14.70 | 21 | 16.10 | — | — | Request quote → |
| M16 | 317 | 16.70 | 23 | 18.10 | 0.30 | — | Request quote → |
| M18 | 320 | 18.70 | 27 | 20.40 | — | — | Request quote → |
| M20 | 321 | 20.70 | 29 | 22.40 | — | — | Request quote → |
| M21 | 323 | 21.70 | 30 | 23.40 | — | — | Request quote → |
| M22 | 324 | 22.70 | 31 | 24.40 | — | 1.90 | Request quote → |
| M24 | 326 | 24.70 | 33 | 26.40 | — | 2.10 | Request quote → |
| M26 | 327 | 27.00 | 35.30 | 28.70 | — | — | Request quote → |
| M27 | 328 | 27.70 | 36 | 29.40 | — | — | Request quote → |
| M28 | 329 | 28.60 | 36 | 30.30 | 0.40 | — | Request quote → |
| M30 | 331 | 30.70 | 39 | 32.40 | — | — | Request quote → |
| M33 | 332 | 33.70 | 42 | 35.40 | — | — | Request quote → |
| M36 | 333 | 37.00 | 48 | 39.60 | — | — | Request quote → |
| M39 | 334 | 40.00 | 51 | 42.60 | — | — | Request quote → |
| M42 | 335 | 43.00 | 54 | 45.60 | — | 2.40 | Request quote → |
| M45 | 336 | 46.00 | 57 | 48.60 | — | 2.60 | Request quote → |
| M48 | 337 | 49.00 | 60 | 51.60 | — | — | Request quote → |
BSPF pipe connections
Datasheet · page 7 · mm
| BSPF thread | Size ref. | C +0.2 | A -0.2 | B +0.2 | D +0.25/-0.00 | E ±0.15 | Inquiry |
|---|---|---|---|---|---|---|---|
| 1/16 | 519 | 8.3 | 12.7 | 9.9 | — | — | Request quote → |
| 1/8 | 510 | 10.4 | 14.7 | 12 | — | — | Request quote → |
| 1/4 | 511 | 13.85 | 18.7 | 15.75 | — | 1.25 | Request quote → |
| 3/8 | 512 | 17.35 | 22.7 | 19.25 | — | — | Request quote → |
| 1/2 | 513 | 21.65 | 26.7 | 23.55 | 0.25 | — | Request quote → |
| 3/4 | 514 | 27.3 | 32.5 | 29.2 | — | — | Request quote → |
| 1 | 515 | 34.2 | 39.5 | 36.1 | — | — | Request quote → |
| 1 1/4 | 516 | 42.8 | 49.5 | 44.7 | — | 2 | Request quote → |
| 1 1/2 | 517 | 48.7 | 55.5 | 50.6 | — | — | Request quote → |
| 2 | 518 | 60.5 | 68.5 | 62.4 | — | — | Request quote → |
Metric GS · ISO 6162-2
Datasheet · page 1 · mm
| Size | STD Part No. | SS Part No. | H (mm) | OD (mm) | ID (mm) | Inquiry |
|---|---|---|---|---|---|---|
| 1/2" | 0823 | 0823SS | 2.03 | 23.80 | 17.28 | Request quote → |
| 3/4" | 1213 | 1213SS | 2.34 | 33.27 | 24.26 | Request quote → |
| 1" | 1629 | 1629SS | 2.34 | 34.93 | 27.05 | Request quote → |
| 1 1/4" | 2030 | 2030SS | 3.25 | 42.80 | 33.89 | Request quote → |
| 1 1/2" | 2432 | 2432SS | 3.25 | 52.38 | 42.93 | Request quote → |
| 2" | 3219 | 3219SS | 3.25 | 63.50 | 51.69 | Request quote → |
| 2 1/2" | 4037 | 4037SS | 3.25 | 75.00 | 64.39 | Request quote → |
| 3" | 4839 | 4839SS | 3.25 | 90.17 | 76.08 | Request quote → |
ANSI GS · ISO 6162-2
Datasheet · page 1 · mm
| Size | STD Part No. | SS Part No. | H (mm) | OD (mm) | ID (mm) | Inquiry |
|---|---|---|---|---|---|---|
| 1/2" | 0821 | 0821SS | 2.00 | 15.88 | 10.37 | Request quote → |
| 3/4" | 0823 | 0823SS | 2.03 | 23.80 | 17.28 | Request quote → |
| 1" | 1633 | 1633SS | 2.34 | 28.58 | 21.54 | Request quote → |
| 1 1/4" | 2042 | 2042SS | 2.34 | 39.00 | 31.00 | Request quote → |
| 1 1/2" | 2448 | 2448SS | 3.25 | 44.45 | 35.94 | Request quote → |
| 2" | 3260 | 3260SS | 3.25 | 55.50 | 46.50 | Request quote → |
| 2 1/2" | 4073 | 4073SS | 3.25 | 69.85 | 54.89 | Request quote → |
| 3" | 4888 | 4888SS | 4.00 | 83.80 | 70.00 | Request quote → |
Metric GS · ISO 6164
Datasheet · page 2 · mm
| Size | STD Part No. | SS Part No. | H (mm) | OD (mm) | ID (mm) | Inquiry |
|---|---|---|---|---|---|---|
| 2" | 3219 | 3219SS | 3.25 | 63.50 | 51.69 | Request quote → |
| 2 1/2" | 4037 | 4037SS | 3.25 | 75.00 | 64.39 | Request quote → |
| 3" | 4839 | 4839SS | 3.25 | 90.17 | 76.08 | Request quote → |
| 4" | 5644 | 5644SS | 4.00 | 110.00 | 95.00 | Request quote → |
| 4 1/2" | 6000 | 6000SS | 4.00 | 126.00 | 108.00 | Request quote → |
| 5" | 6455 | 6455SS | 5.00 | 143.70 | 127.00 | Request quote → |
| 6" | 8001 | 8001SS | 8.00 | 181.00 | 155.00 | Request quote → |
| 8" | 9600 | 9600SS | 9.00 | 240.00 | 205.00 | Request quote → |
ANSI GS · ISO 6164
Datasheet · page 2 · mm
| Size | STD Part No. | SS Part No. | H (mm) | OD (mm) | ID (mm) | Inquiry |
|---|---|---|---|---|---|---|
| 2" | 3260 | 3260SS | 3.25 | 55.50 | 46.50 | Request quote → |
| 2 1/2" | 4073 | 4073SS | 3.25 | 69.85 | 54.89 | Request quote → |
| 3" | 4888 | 4888SS | 4.00 | 83.80 | 70.00 | Request quote → |
| 4" | 5644 | 5644SS | 4.00 | 110.00 | 95.00 | Request quote → |
Blank cells may share a value in the PDF. Confirm dimensions for the supplied item before ordering.
DESIGNS
Standard or Self-Centring
Self-Centring has an additional elastomer membrane that helps keep the seal correctly positioned during installation. The design is intended for connections with a thread undercut.
Self-Centring Bonded Seal
Additional centring membrane for easier positioning and reduced risk of displacement during installation.
View dimensions →PRINCIPLE
Controlled compression.
The elastomer is vulcanised to the inside diameter of the metal washer. When the connection is tightened, the elastomer is compressed between the contact surfaces. The metal washer provides mechanical support and limits deformation.
Material, dimensions and seal type are selected according to the connection and operating conditions.
MATERIALS
Same dimension – several material options.
Bonded Seals are available in different combinations of elastomer and metal. Select materials according to media, temperature, environment and corrosion-resistance requirements.
ELASTOMER / RUBBERNBR · FKM (Viton) · HNBR · EPDM
METAL WASHERZinc-plated carbon steel · Stainless steel AISI 316
Common combinations: NBR / standard steel · FKM / standard steel · NBR / AISI 316 · FKM / AISI 316
Available combinations depend on type and dimension. For critical applications, compound, material grade and relevant documentation are confirmed with the inquiry.
NBR86 Shore A
ASTM D471: tested against reference oils, water and reference fuels.
FKM76 Shore A
Documented heat ageing, compression set and fluid resistance.
HNBR88.9 Shore A
RGD test on O-ring specimens to ISO 23936-2:2011 Annex B. Not a qualification of the complete Bonded Seal.
EPDM72.4 Shore A
Documented water, ozone and low-temperature properties.
EPDM / AISI 316
EPDM Bonded Seals / Dowty seals
STEMA can supply Bonded Seals with EPDM elastomer and an AISI 316 stainless steel washer on request. Sizes and configurations are confirmed for the specified item.
Selection depends on the medium, temperature, pressure and connection. EPDM material selection and oxygen cleaning are assessed separately.
EPDM material guide →O₂ / OXYGEN CLEANING
Oxygen-cleaned Bonded Seals
Oxygen cleaning with a cleaning certificate is available on request for specified Bonded Seals. Cleaning to ASTM G93 Level B has been offered for FKM / AISI 316 configurations.
Cleaning requirements, inspection and packaging are agreed per order. Cleaning alone does not establish suitability for oxygen service.
Oxygen cleaning and documentation →NORWEGIAN INDUSTRIAL SUPPLIER
Technical enquiries and documentation
STEMA AS is a Norwegian supplier of Bonded Seals for industry, hydraulics and OEM applications. The catalogue covers Standard, Self-Centring and GS. Specify series, thread size, reference and dimensions from the drawing.
What should I include in a B2B enquiry?
Send reference or dimensions, material, quantity, medium, temperature, pressure and static or dynamic duty. Stock, delivery time and suitability are confirmed in the quotation.
Can I request a 3.1 certificate?
Specify requirements for EN 10204 3.1, traceability or other certificates in your enquiry. Available documentation is confirmed for the specific item and order; catalogue inclusion does not mean every product is supplied with a 3.1 certificate.
B2B PROCUREMENT & PRODUCT INQUIRIES
Request a Bonded Seal quotation
We welcome enquiries from distributors, OEMs and industrial buyers. Send size or reference, elastomer, metal grade, quantity, expected annual volume and delivery country. Include media, temperature, pressure and any documentation or packaging requirements. Most of our range is in stock. We supply from one piece to thousands; standard bags contain 100 pieces per size, not a minimum order quantity. Items available from our production partner normally take 1–2 weeks; items requiring production usually take 4–5 weeks. Final availability, lead time and labelling are confirmed in the quotation.