BS 1806 Silicone O-rings
Manufacturer & Custom Solutions
BS 1806 Silicone O-rings
ZSR Silicone manufactures silicone O-rings that fully match BS 1806 standard sizes, including both the AS568-compatible sizes and the additional in-between sizes unique to this standard. If your equipment or documentation still references the BS 1806 specification, we can supply the exact size you need in the silicone material that suits your working conditions.
FDA 21 CFR 177.2600
Rubber Articles Intended for Repeated Use
LFGB 30&31
EU Food Contact Materials
USP Class VI / ISO 10993
Biocompatibility of Medical Devices
RoHS / REACH
Environmental Compliance
UL 94
Flammability of Plastic Materials
Built to Your Exact Spec
Custom Silicone O-Rings Options
Every Silicone Grade, One Perfect Seal
Every O-ring starts with the right compound. Platinum-cured and peroxide-cured systems are available for all grades — we recommend platinum cure for food and medical contact.
| Grade | Hardness (Shore A) | Temperature | Compliance | Best For |
|---|---|---|---|---|
| Industrial VMQ | 30 – 80 | -60°C to +230°C | RoHS / REACH | General industrial sealing |
| FDA Food Grade | 30 – 70 | -60°C to +230°C | FDA 21 CFR 177.2600 | Food & beverage equipment |
| Medical Grade (Platinum) | 10 – 70 | -60°C to +230°C | USP Class VI | Medical devices & laboratory |
| High Temperature | 40 – 80 | up to +300°C | RoHS | Ovens, lighting, engine bays |
| Fluorosilicone (FVMQ) | 40 – 80 | -60°C to +200°C | RoHS | Fuel, oil & solvent exposure |
| LSR (Liquid Silicone) | 10 – 80 | -60°C to +230°C | FDA / medical grades | High-volume precision parts |
| Transparent / Clear | 30 – 70 | -60°C to +200°C | FDA options | Visual inspection points |
From 0.5 mm ID to Oversized Joint Rings
Size, cross-section and tolerance are fully custom. Send a drawing, a standard size number (e.g., AS568-214), or a physical sample — we handle the rest.
| Item | Range / Options |
|---|---|
| Size Range | ID 0.5 – 500 mm+; molded or vulcanized-joint for oversized IDs |
| Cross-Section | 0.5 – 10 mm; round (standard), square-cut, custom profile |
| Size Standards | AS568 · JIS B2401 · BS 1806 · DIN 3771 · ISO 3601 · ISO 6149 · AN6227 / AN6230 (see standards table below) |
| Tolerance | ISO 3302-1 class per size & process; ±0.05 mm on small molded rings |
| Custom Geometry | Non-standard ID / cross-section from your drawing or sample |
| Surface | Standard finish / PTFE-coated for low friction |
Any Color Your Brand or Assembly Needs
We color-match silicone compounds to Pantone or RAL references, including translucent and transparent grades for visual inspection points.
Your Brand, Built Into the Part
Branding, part numbers and batch traceability — molded in, engraved or printed, without compromising the seal.
Molded, Spliced or Coated — One Factory
Molding, splicing and finishing under one roof — we match the process to your volume, size and tolerance target.
| Process | How It Works | Best For |
|---|---|---|
| Compression Molding | Pre-formed silicone pressed and cured in a heated mold | Medium volumes, large cross-sections |
| LSR Injection Molding | Liquid silicone injected into closed molds | High volumes, tight tolerances |
| Vulcanized Joint (Spliced) | Extruded cord cut to length and vulcanized into a ring | Oversized IDs, low volumes, fast tooling |
| PTFE Coating | Low-friction coating applied to finished rings | Dynamic sealing, easy installation |
| Rapid Prototyping | Prototype tooling before production mold | Fit & function validation |
Related Silicone O-ring
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
|
| BS 1806 Silicone O-rings | Standard & Size | British Standard inch-size silicone O-rings. Common in UK and Commonwealth industrial equipment. | View Details |
| DIN 3771 Silicone O-rings | Standard & Size | German metric standard O-rings for hydraulic and pneumatic sealing in European machinery. | View Details |
|
| Custom Molded Silicone O-rings | Standard & Size | Custom-shaped silicone O-rings molded to your exact drawing or sample. No standard size limitations. | View Details |
| AS568 Silicone O-rings | Standard & Size | Inch-size silicone O-rings that follow the AS568 standard. Widely used in North American machinery and hydraulic systems. | View Details |
| AN6227 Silicone O-rings | Standard & Size | Aerospace-standard O-rings with small cross-section. Used in aviation and military-grade sealing. | View Details |
| JIS B2401 Silicone O-Ring | Standard & Size | Japanese industrial standard O-rings commonly used in Asian-manufactured machinery and automotive equipment. | View Details |
| ISO 3601 Metric Silicone O-Rings | Standard & Size | Metric silicone O-rings manufactured to ISO 3601 dimensions. Fits international equipment groove standards. | View Details |
| ISO 6149 Metric Silicone O-Rings | Standard & Size | Metric O-rings designed for hydraulic and pneumatic fluid power sealing applications under ISO 6149 standards. | View Details |
| FDA Food Grade Silicone O-Rings | Grade | Food-safe silicone O-rings compliant with FDA regulations. Safe for repeated food contact. | View Details |
| Industrial Grade Silicone O-ring | Grade | General-purpose silicone O-rings for industrial sealing. Cost-effective with reliable performance. | View Details |
| Medical Grade Silicone O-ring | Grade | Biocompatible silicone O-rings for medical devices. Passes USP Class VI and supports sterilization. | View Details |
| High Temperature / Heat Resistant Silicone O-Rings | Special Function | Silicone O-rings that stay flexible at temperatures above 200°C. For ovens, engines and furnaces. | View Details |
| Oil-Resistant / Fuel-Resistant Silicone O-Rings | Special Function | Modified silicone O-rings that resist swelling in oils, fuels and petroleum-based fluids. | View Details |
 | VMQ Silicone O-Rings | Materials | Heat and cold-resistant silicone O-rings for food, medical, automotive, and industrial applications. | View Details |
| HCR / HTV / Solid Silicone Rubber O-rings | Materials | Durable solid silicone rubber O-rings made by compression molding. The standard choice for general sealing. | View Details |
| Fiberglass Reinforced Silicone O-rings | Materials | High-strength silicone O-rings reinforced with fiberglass fabric. Withstands extreme heat and pressure. | View Details |
| Liquid Silicone Rubber (LSR) O-rings | Materials | Injection-molded liquid silicone rubber O-rings with tight tolerances and clean surfaces. Ideal for high-volume production. | View Details |
| Platinum Cured Silicone O-rings | Materials | Ultra-clean silicone O-rings cured with platinum catalyst. Lower extractables for food and medical use. | View Details |
 | Fluorosilicone (FVMQ) O-rings | Materials | Fuel and oil-resistant silicone O-rings for aerospace, automotive and chemical applications. | View Details |
| Transparent / Clear Silicone O-rings | Color | See-through silicone O-rings for visual inspection and clean-looking medical or food equipment. | View Details |
| Custom Colors Silicone O-rings | Color | Silicone O-rings matched to your exact color sample or specification. | View Details |
What Is BS 1806 Standard?
BS 1806 is a British standard for O-ring sizes, originally issued by the British Standards Institution. This standard lists all Imperial standard sizes and includes the five main cross-section groups found in AS568, plus additional sizes that fall between the AS568 sizes.
BS 1806 has been officially replaced by BS ISO 3601, which aligns British O-ring standards with the international ISO 3601 standard. However, because BS 1806 is still widely referenced in certain industries and regions around the world, it remains important for cross-reference purposes.
The sizes in BS 1806 are fully compatible with AS568, meaning the two standards can be used interchangeably for matching sizes.
ZSR Silicone manufactures silicone O-rings that fully match BS 1806 standard sizes, including both the AS568-compatible sizes and the additional in-between sizes unique to this standard. If your equipment or documentation still references the BS 1806 specification, we can supply the exact size you need in the silicone material that suits your working conditions.
Simple BS 1806 Silicone O-rings Size Chart
BS 1806 Standard No. Range | CS (mm) | ID Range (mm) | OD Range (mm) | CS (inch) | ID Range (inch) | OD Range (inch) |
|---|---|---|---|---|---|---|
BS1806-001~003 | 1.02 ~ 1.52 | 0.74 ~ 1.42 | 2.78 ~ 4.46 | 0.040 ~ 0.060 | 0.029 ~ 0.056 | 0.109 ~ 0.176 |
BS1806-004~050 | 1.78 | 1.78 ~ 133.07 | 5.34 ~ 136.63 | 0.070 | 0.070 ~ 5.239 | 0.210 ~ 5.379 |
BS1806-102~178 | 2.62 | 1.24 ~ 247.32 | 6.48 ~ 252.56 | 0.103 | 0.049 ~ 9.737 | 0.255 ~ 9.943 |
BS1806-201~284 | 3.53 | 4.34 ~ 456.06 | 11.40 ~ 463.12 | 0.139 | 0.171 ~ 17.955 | 0.449 ~ 18.233 |
BS1806-309~395 | 5.33 | 10.46 ~ 658.88 | 21.12 ~ 669.54 | 0.210 | 0.412 ~ 25.940 | 0.831 ~ 26.360 |
BS1806-400~475 | 6.99 | 34.29 ~ 658.88 | 48.27 ~ 672.84 | 0.275 | 1.350 ~ 25.940 | 1.900 ~ 26.490 |
BS1806-901~932 | 1.42 ~ 3.00 | 4.70 ~ 59.36 | 7.54 ~ 65.36 | 0.056 ~ 0.118 | 0.185 ~ 2.337 | 0.297 ~ 2.573 |