Metric Size Silicone Gaskets
Manufacturer & Custom Solutions
Metric Size Silicone Gaskets
Metric dimension silicone gaskets from ZSR Silicone fit international equipment standards. Available in diameters and thicknesses that match ISO and DIN specifications. Custom metric sizes are no problem.
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 Gaskets Options
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
 | DIN 32676 Silicone Gasket | Standard & Size | DIN 32676 tri-clamp silicone gaskets, FDA food grade, full size range in stock at ZSR factory. | View Details |
 | AS568 Standard Silicone Gaskets | Standard & Size | AS568 standard-size silicone gaskets for groove-based sealing applications. | View Details |
 | DIN 3869 Silicone Sealing Ring | Standard & Size | DIN 3869 profile sealing rings in silicone for hydraulic ports, working from -60°C to +200°C. | View Details |
 | EN 1514-1 Silicone Gasket | Standard & Size | EN 1514-1 silicone flat gaskets for PN flanges, IBC and FF types, standard and custom sizes. | View Details |
 | Custom Die Cut Silicone Gaskets | Standard & Size | Flat silicone gaskets cut to any shape from sheet stock. Precision cutting for exact fits. | View Details |
 | ISO 7483 Silicone Gasket | Standard & Size | Silicone gaskets to ISO 7483 for ISO 7005 flanges, made for international projects and tenders. | View Details |
 | Custom Molded Silicone Gaskets | Standard & Size | Three-dimensional silicone gaskets made by compression or injection molding. For complex sealing shapes. | View Details |
 | ISO 1127 Silicone Gasket | Standard & Size | Sanitary silicone gaskets matched to ISO 1127 stainless steel tube sizes for food and pharma lines. | View Details |
 | Standard Flange Silicone Gaskets | Standard & Size | Silicone gaskets cut to fit pipe flanges. Matches ANSI, DIN and JIS bolt patterns. | View Details |
 | B16.21 Silicone Gasket | Standard & Size | ZSR makes silicone gaskets to ASME B16.21, ring type and full face type, for Class 150 to 2500 pipe flanges. | View Details |
 | ISO 2852 Silicone Gasket | Standard & Size | ISO 2852 silicone clamp gaskets for food industry couplings, FDA grade, factory direct from ZSR. | View Details |
 | Tri-Clamp / Sanitary Silicone Gaskets | Standard & Size | Hygienic silicone gaskets for food and pharmaceutical pipe connections. CIP and SIP compatible. | View Details |
 | B16.5 Silicone Gasket | Standard & Size | Silicone gaskets from ZSR sized to fit ASME B16.5 flanges, NPS 1/2 to 24 inch, Class 150 to 2500. | View Details |
 | Metric Size Silicone Gaskets | Standard & Size | Metric dimension silicone gaskets for international equipment standards. | View Details |
 | DIN 7603 Silicone Sealing Ring | Standard & Size | Flat silicone sealing rings made to DIN 7603 for screw plugs, banjo bolts and threaded fittings. | View Details |
 | DIN 2690 Silicone Gasket | Standard & Size | Silicone flat gaskets to DIN 2690 / EN 1514-1 dimensions for PN6 to PN40 flanges, food grade available. | View Details |
 | DIN 2691 Silicone Gasket | Standard & Size | Silicone gaskets made to DIN 2691 for tongue and groove flanges PN10 to PN160, ideal for plant repair. | View Details |
 | DIN 11851 Silicone Gasket | Standard & Size | Food grade silicone gaskets for DIN 11851 sanitary unions, DN10 to DN150, FDA material. | View Details |
 | FDA Food Grade Silicone Gasket | Grade | Food-safe silicone gaskets for processing equipment. FDA-compliant and taste-neutral. | View Details |
 | Medical Grade Silicone Gasket | Grade | Biocompatible silicone gaskets for medical devices. Sterilizable with full documentation. | View Details |
 | Industrial Grade Silicone Gasket | Grade | General-purpose silicone gaskets for industrial sealing. Reliable, durable and cost-effective. | View Details |
 | High Temperature / Heat Resistant Silicone Gaskets | Special Function | Heat-resistant silicone gaskets rated for continuous use above 200°C. For ovens and furnaces. | View Details |
 | Flame Retardant Silicone Gaskets | Special Function | Self-extinguishing silicone gaskets meeting UL 94 V-0. For fire-safety applications. | View Details |
 | Solid Silicone Rubber Gaskets | Materials | Solid silicone rubber gaskets with excellent compression set resistance and long service life. | View Details |
 | Fluorosilicone (FVMQ) Gaskets | Materials | Fuel and solvent-resistant silicone gaskets for chemical processing and automotive applications. | View Details |
 | Transparent / Clear Silicone Gaskets | Color | Clear silicone gaskets for visible sealing and light-transmitting applications. | View Details |
 | Black / White Silicone Gaskets | Color | Standard black and white silicone gaskets. Fastest delivery from stock. | View Details |
Metric Size System and Standards
Metric silicone gaskets follow millimeter-based size systems. Two families of standards cover most needs:
ISO 3601 (metric series)
the international O-ring standard. Its Class B metric sizes use five standard cross-sections: 1.8, 2.65, 3.55, 5.3, and 7.0 mm. Many small metric gaskets and gland seals are sized from this system.
DIN / EN flange standards (EN 1092-1)
the European flange system, sized by DN (nominal diameter, mm) and PN (pressure rating). Metric flange gaskets for DN15 to DN600 pipelines follow these dimensions.
Other metric systems we work with every day include JIS B2401 (Japan), GB/T 3452 (China), and DIN 3771 (Germany). Metric gaskets are the standard choice for European and Asian equipment — machines, pumps, valves, and instruments designed in millimeters need gaskets made in millimeters.
Common Metric Sizes We Supply
Inner Diameter (mm) | 1 mm | 1.5 mm | 2 mm | 3 mm | 4 mm | 5 mm | 6 mm |
|---|---|---|---|---|---|---|---|
10 | ✓ | ✓ | ✓ | ✓ | – | – | – |
20 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | – |
30 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
50 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
80 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
100 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
150 | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
200 | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
300 | – | – | ✓ | ✓ | ✓ | ✓ | ✓ |
400 | – | – | ✓ | ✓ | ✓ | ✓ | ✓ |
500 | – | – | ✓ | ✓ | ✓ | ✓ | ✓ |
Any ID from 3 mm to 600 mm is available — the table above just shows the most requested sizes. Other thicknesses (0.5 mm up to 25 mm) are also available on request.
Metric vs Inch Size Gaskets
Metric and inch sizes look close on paper, but they are not interchangeable. A 25 mm gasket is not the same as a 1-inch gasket (25.4 mm) — that 0.4 mm difference is enough to cause a bad fit, a pinched edge, or a leak.
Metric Size | Nearest Inch Size | Actual Difference |
|---|---|---|
10 mm | 3/8" (9.53 mm) | 0.47 mm |
20 mm | 3/4" (19.05 mm) | 0.95 mm |
25 mm | 1" (25.4 mm) | 0.4 mm |
50 mm | 2" (50.8 mm) | 0.8 mm |
100 mm | 4" (101.6 mm) | 1.6 mm |
1 mm thick | 0.039" | – |
3 mm thick | ≈ 1/8" (3.18 mm) | 0.18 mm |
6 mm thick | ≈ 1/4" (6.35 mm) | 0.35 mm |
The safe rule
If your equipment was designed in metric, buy metric gaskets — do not round to the nearest inch size. At ZSR Silicone Parts, we cut and mold to exact metric dimensions. Both our CNC knife cutting and our die cutting are programmed in millimeters, so a 25.0 mm gasket ships as a true 25.0 mm gasket, not a "close enough" conversion.
ZSR Metric Gasket Capabilities
No minimum size for sheet-cut gaskets
from tiny 3 mm ID washers up to 1500 mm sheet gaskets
Digital templates on file
for common metric flange sizes (EN 1092-1, DIN, JIS, GB) and popular equipment models — no setup delay, faster samples, faster delivery
Molded metric gaskets from 5 mm ID to 600 mm OD
in solid, sponge, or foam silicone
Quality control per ISO 3601-3 Grade N
as standard; Grade S and Grade CS inspection levels available for critical parts
Tolerances per ISO 3601-1 (Class A / Class B)
as standard — tighter tolerances available on request
Send us your metric drawing, your equipment model, or just the ID × OD × thickness in millimeters. We handle the rest.
What Are Metric Size Silicone Gaskets?
Metric size silicone gaskets are sealing gaskets dimensioned in millimeters. They are made to fit equipment designed in the metric system — which means most machines, pumps, valves, and pipelines built in Europe and Asia.
Sized in Millimeters, Made for Metric Equipment
Every dimension on these gaskets — inner diameter, outer diameter, cross-section, and thickness — is specified in millimeters. Common thicknesses run from 1 mm to 6 mm, and common sizes follow international metric standards like ISO 3601 for ring seals and EN 1092-1 for pipeline flanges. If your equipment drawing is in millimeters, your gasket should be too.
Why "Exact Metric" Matters
Metric and inch sizes are close, but never the same. A gasket rounded to the "nearest inch size" can be off by 0.4 mm or more — enough to leak or to fail early. True metric gaskets are cut or molded to the exact millimeter dimension, so they drop into metric grooves and flanges with the fit the designer intended.
Why Silicone for Metric Gaskets?
Silicone keeps its flexibility from -60°C to over 200°C, resists UV and ozone, and seals at low bolt force. In food grade or medical grade compounds, metric silicone gaskets go safely into European food machines, Asian electronics, and laboratory equipment worldwide.
Made by ZSR Silicone Parts
We make metric silicone gaskets every day, for customers in more than 40 countries. Our cutting machines are programmed in millimeters, our digital template library covers the common metric standards, and every gasket is made in our own factory. Send us your metric sizes — we will quote within 24 hours.