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Micro & Miniature O-Rings

Precision Micro & Micro-Miniature | International Seal

Precision Micro & Miniature O-Rings

International Seal supplies micro O-rings and miniature elastomer seals for precision engineering applications where small dimensions, tight tolerances and reliable sealing performance are essential. Our range includes miniature O-rings in NBR, FKM and Silicone, with access to an extensive tooling catalogue covering small inside diameters and cross-sections. We also support non-standard dimensions and custom miniature moulded components manufactured to customer drawings and specifications.

As a UK supplier of engineered sealing products, we work with distributors, OEMs and industrial customers across medical equipment, semiconductor manufacturing, instrumentation, fluid control and specialist engineering.

Whether you require an existing micro O-ring size, a specialist elastomer grade or a custom precision component, our team can review your technical requirements and provide a competitive quotation.

Key Advantages:

  • Unmatched precision — Tight tolerances and controlled molding processes ensure repeatable quality.
  • Versatile materials — Wide selection of high-performance elastomers for varied applications.
  • Rapid prototyping — From concept to production, we move fast without compromising accuracy.
  • Reliable sealing — Proven performance in medical, electronic, and fluid-control systems.
international Seal | Miniaturized Sealing Solutions

Each micro-molded component is manufactured under strict quality control to guarantee dimensional accuracy, surface finish, and long-term durability — meeting the highest standards for performance and consistency.

Our micro and miniature O-rings are used in critical applications where precision and reliability are essential. From medical devices requiring biocompatibility and consistent sealing, to semiconductor systems operating in demanding environments, each component is engineered to perform where conventional seals cannot.

As devices and mechanical systems continue to reduce in size, demand for miniature sealing solutions is increasing. International Seal meets this need through precision engineering, advanced materials, and dependable performance.

Common applications include:

  • Medical and diagnostic devices — ensuring leak-free performance in compact instruments.
  • Semiconductor and electronics — maintaining vacuum integrity and contamination control.
  • Fluid and gas systems — providing reliable micro-sealing for valves, sensors, and fittings.
  • Aerospace and defense — offering stability under pressure, temperature, and vibration.
international Seal | Tight tolerances. Reliable performance. Fast turnaround.

What We Deliver

Precision Engineering at Every Scale
Every component is engineered for accuracy, consistency, and high-performance sealing—delivering reliable results across critical applications, with speed and confidence.

  • O-Rings & Moulded Components — From micro to mid-range precision parts
  • Material Options — NBR, FKM, and silicone in a range of durometers and colours
  • Ultra-Tight Tolerances — Precision moulded to ISO 3302-1 Class M2
  • Rapid Turnaround — Supported by our 30-day Fast Prototype Supply (FPS)

Tight tolerances. Reliable performance. Fast turnaround.

international Seal | Technical Excellence

Technical Excellence

Precision Component Supply.                                                                                      Experience consistent precision with expertly moulded micro-components engineered to maintain peak performance in demanding applications.

International Seal supports precision component requirements through specialist sourcing, material knowledge and dependable supply.

Material & Colour Range

  • NBR (30–90 Shore A) — Excellent resistance to fuels, oils and wear; available in a wide range of colours
  • FKM (60–90 Shore A) — High-temperature performance; typically available in black, brown and green
  • Silicone (30–80 Shore A) — Outstanding flexibility and purity; available in a wide range of colours

Tolerance Reference — ISO 3302-1 Class M2

Dimensions
Tolerance
Up to 1 mm
0.08 mm
1 – 3 mm
0.10 mm
3 – 6 mm
0.13 mm
6 – 10 mm
0.16 mm
10 – 18 mm
0.20 mm

Dimensional tolerances
per ISO 3302-1 Class M2 ensure micro-level consistency.

International Seal | Quality Assurance

Quality Assurance

Every component is 100% inspected—either manually or using advanced digital imaging—to ensure precise dimensions, minimal flash, and consistently clean surfaces.

  • Flash height below 0.05 mm
  • No secondary finishing required
  • Controlled, consistent parting lines
  • Full batch traceability and documentation

Applications & Benefits

Application Fields
International Seal micro and miniature O-rings are specified across high-precision industries:

  • Medical Devices — diagnostic equipment, fluid control valves, micro-pumps
  • Semiconductor — cleanroom-grade components with low outgassing materials
  • Food & Beverage — FDA-compliant silicones for hygienic processing
  • Industrial Systems — hydraulic, pneumatic, and vacuum applications

Why Choose International Seal
We combine global sourcing capability with engineering precision to deliver dependable sealing solutions:

  • Specialist sourcing and sealing expertise
  • Reliable lead times through our Fast Prototype Supply (FPS) programme
  • Compliance with ISO 3302-1 Class M2 and full material traceability
  • Access to an extensive O-ring tooling catalogue
  • Collaborative support from design through to validation

Performance Advantages

  • Tight tolerances with minimal dimensional variation
  • Stable sealing performance under pressure and temperature extremes
  • Resistance to UV, ageing, and chemical exposure
  • Consistent colour, hardness, and surface integrity across production batches

Micro & Miniature Components We Supply

  • Micro O-Rings — small-diameter elastomer sealing rings for precision applications
  • Miniature O-Rings — compact sealing rings across a range of ID and cross-section dimensions
  • Custom Moulded Rubber Components — miniature profiles supplied to customer drawing or specification
  • Micro Seals — specialist small sealing components for compact assemblies
  • Precision Rubber Parts — non-standard miniature components for medical, electronics, fluid-control and specialist applications

Micro O-Ring Sizes & Available Tooling

The table below shows examples from our available micro and miniature O-ring tooling range. Dimensions are shown by inside diameter (ID) and cross-section (CS) in both metric and imperial units.

The tooling list represents available dimensional options rather than the limits of our miniature component capability. Custom moulded micro parts and non-standard sealing profiles may also be supplied to drawing or specification.

Micro O-Ring Tooling & Size List

Your Guide to Precision Tooling Solutions

PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00031-013
0.029
0.013
0.74
0.33
00031-018
0.031
0.018
0.80
0.45
00039-022
0.039
0.022
0.99
0.56
00051-016
0.051
0.016
1.30
0.40
00055-016
0.055
0.016
1.40
0.40
00059-024
0.059
0.024
1.50
0.60
00063-016
0.063
0.016
1.60
0.40
00064-021
0.064
0.021
1.63
0.53
00070-030
0.070
0.030
1.78
0.76
00075-018
0.075
0.018
1.90
0.45
00078-035
0.078
0.035
1.98
0.89
00079-031
0.079
0.031
2.00
0.80
00080-018
0.080
0.018
2.02
0.45
00087-031
0.087
0.031
2.20
0.80
PART No.
I.D - (in)
C/S - (in)
I.D - (mm)
C/S -(mm)
00031-013
0.029
0.013
0.74
0.33
00031-018
0.031
0.018
0.80
0.45
00039-022
0.039
0.022
0.99
0.56
00051-016
0.051
0.016
1.30
0.40
00055-016
0.055
0.016
1.40
0.40
00059-024
0.059
0.024
1.50
0.60
00063-016
0.063
0.016
1.60
0.40
00064-021
0.064
0.021
1.63
0.53
00070-030
0.070
0.030
1.78
0.76
00075-018
0.075
0.018
1.90
0.45
00078-035
0.078
0.035
1.98
0.89
00079-031
0.079
0.031
2.00
0.80
00080-018
0.080
0.018
2.02
0.45
00087-031
0.087
0.031
2.20
0.80

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Tooling List

Explore Precision Tooling Solutions

PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00091-018
0.091
0.018
2.3
0.45
00091-022
0.091
0.022
2.31
0.56
00094-028
0.094
0.028
2.4
0.72
00098-020
0.098
0.020
2.5
0.50
00098-026
0.098
0.026
2.5
0.65
00100-012
0.100
0.012
2.54
0.30
00113-018
0.113
0.018
2.87
0.46
00118-031
0.118
0.031
3.00
0.79
00120-020
0.120
0.020
3.05
0.50
00133-032
0.133
0.032
3.38
0.81
00141-024
0.141
0.024
3.57
0.60
00144-020
0.144
0.020
3.65
0.52
00150-020
0.150
0.020
3.80
0.50
00150-030
0.150
0.030
3.81
0.76
00154-016
0.154
0.016
3.90
0.40
00154-019
0.154
0.019
3.90
0.49
00158-024
0.158
0.024
4.01
0.60
00158-028
0.158
0.028
4.01
0.70
PART No.
I.D - (in)
C/S - (in)
I.D - (mm)
C/S -(mm)
00091-018
0.091
0.018
2.3
0.45
00091-022
0.091
0.022
2.31
0.56
00094-028
0.094
0.028
2.4
0.72
00098-020
0.098
0.020
2.5
0.50
00098-026
0.098
0.026
2.5
0.65
00100-012
0.100
0.012
2.54
0.30
00113-018
0.113
0.018
2.87
0.46
00118-031
0.118
0.031
3.00
0.79
00120-020
0.120
0.020
3.05
0.50
00133-032
0.133
0.032
3.38
0.81
00141-024
0.141
0.024
3.57
0.60
00144-020
0.144
0.020
3.65
0.52
00150-020
0.150
0.020
3.80
0.50
00150-030
0.150
0.030
3.81
0.76
00154-016
0.154
0.016
3.90
0.40
00154-019
0.154
0.019
3.90
0.49
00158-024
0.158
0.024
4.01
0.60
00158-028
0.158
0.028
4.01
0.70
Access to a broad O-Ring Tooling Catalog | International Seal

Tooling List

Precision Tooling for Advanced Sealing Applications

PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00161-020
0.161
0.02
4.1
0.5
00165-026
0.165
0.026
4.2
0.65
00170-030
0.17
0.03
4.32
0.76
00173-022
0.173
0.022
4.39
0.56
00177-020
0.177
0.02
4.5
0.5
00177-031
0.177
0.031
4.5
0.8
00181-024
0.181
0.024
4.6
0.6
00181-030
0.181
0.03
4.6
0.76
00187-019
0.187
0.019
4.75
0.48
00188-031
0.188
0.031
4.77
0.79
00191-023
0.191
0.023
4.85
0.58
00191-030
0.191
0.03
4.85
0.76
00197-031
0.197
0.031
5
0.8
00198-024
0.198
0.024
5.02
0.6
00205-024
0.205
0.024
5.21
0.61
00208-031
0.208
0.031
5.28
0.79
00208-031
0.208
0.031
5.28
0.79
00209-020
0.209
0.02
5.31
0.51
PART No.
I.D - (in)
C/S - (in)
I.D - (mm)
C/S -(mm)
00161-020
0.161
0.02
4.1
0.5
00165-026
0.165
0.026
4.2
0.65
00170-030
0.17
0.03
4.32
0.76
00173-022
0.173
0.022
4.39
0.56
00177-020
0.177
0.02
4.5
0.5
00177-031
0.177
0.031
4.5
0.8
00181-024
0.181
0.024
4.6
0.6
00181-030
0.181
0.03
4.6
0.76
00187-019
0.187
0.019
4.75
0.48
00188-031
0.188
0.031
4.77
0.79
00191-023
0.191
0.023
4.85
0.58
00191-030
0.191
0.03
4.85
0.76
00197-031
0.197
0.031
5
0.8
00198-024
0.198
0.024
5.02
0.6
00205-024
0.205
0.024
5.21
0.61
00208-031
0.208
0.031
5.28
0.79
00208-031
0.208
0.031
5.28
0.79
00209-020
0.209
0.02
5.31
0.51

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Tooling List

Your Resource for High-Precision Tooling

PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00219-028
0.219
0.028
5.55
0.7
00220-032
0.22
0.032
5.59
0.81
00244-028
0.244
0.028
6.2
0.7
00244-031
0.244
0.031
6.2
0.8
00244-031
0.244
0.031
6.2
0.8
00244-031
0.244
0.031
6.2
0.8
00246-024
0.246
0.024
6.25
0.6
00248-028
0.248
0.028
6.3
0.7
00250-032
0.25
0.032
6.35
0.81
00252-031
0.252
0.031
6.4
0.8
00260-022
0.26
0.022
6.6
0.55
00268-026
0.268
0.026
6.8
0.65
00280-020
0.28
0.02
7.1
0.5
00283-031
0.283
0.031
7.19
0.79
00284-028
0.284
0.028
7.21
0.71
PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00219-028
0.219
0.028
5.55
0.7
00220-032
0.22
0.032
5.59
0.81
00244-028
0.244
0.028
6.2
0.7
00244-031
0.244
0.031
6.2
0.8
00244-031
0.244
0.031
6.2
0.8
00244-031
0.244
0.031
6.2
0.8
00246-024
0.246
0.024
6.25
0.6
00248-028
0.248
0.028
6.3
0.7
00250-032
0.25
0.032
6.35
0.81
00252-031
0.252
0.031
6.4
0.8
00260-022
0.26
0.022
6.6
0.55
00268-026
0.268
0.026
6.8
0.65
00280-020
0.28
0.02
7.1
0.5
00283-031
0.283
0.031
7.19
0.79
00284-028
0.284
0.028
7.21
0.71
Precision Manufacturing | International Seal

Tooling List

Engineered Tooling Solutions for Precision Manufacturing

PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00294-015
0.294
0.015
7.48
0.39
00295-024
0.295
0.024
7.49
0.6
00315-028
0.315
0.028
8
0.7
00332-030
0.332
0.03
8.43
0.76
00339-016
0.339
0.016
8.6
0.4
00339-016
0.339
0.016
8.6
0.4
00346-022
0.346
0.022
8.8
0.55
00354-020
0.354
0.02
9
0.5
00354-030
0.354
0.03
9
0.75
00394-030
0.394
0.03
10
0.75
00406-016
0.406
0.016
10.3
0.4
00410-031
0.41
0.031
10.41
0.79
00468-030
0.468
0.03
11.89
0.76
00507-025
0.507
0.025
12.88
0.64
00510-030
0.51
0.03
12.95
0.76
00531-030
0.531
0.03
13.5
0.75
00540-030
0.54
0.03
13.72
0.76
00545-025
0.545
0.025
13.84
0.64
PART No.
I.D - (in)
C/S - (in)
I.D - (mm)
C/S -(mm)
00294-015
0.294
0.015
7.48
0.39
00295-024
0.295
0.024
7.49
0.6
00315-028
0.315
0.028
8
0.7
00332-030
0.332
0.03
8.43
0.76
00339-016
0.339
0.016
8.6
0.4
00339-016
0.339
0.016
8.6
0.4
00346-022
0.346
0.022
8.8
0.55
00354-020
0.354
0.02
9
0.5
00354-030
0.354
0.03
9
0.75
00394-030
0.394
0.03
10
0.75
00406-016
0.406
0.016
10.3
0.4
00410-031
0.41
0.031
10.41
0.79
00468-030
0.468
0.03
11.89
0.76
00507-025
0.507
0.025
12.88
0.64
00510-030
0.51
0.03
12.95
0.76
00531-030
0.531
0.03
13.5
0.75
00540-030
0.54
0.03
13.72
0.76
00545-025
0.545
0.025
13.84
0.64
Medical and diagnostic devices | International Seal

Tooling List

Precision Tooling Designed for Reliable Performance

PART No.
Dimensions: I.D (in)
Dimensions: C/S (in)
Dimensions: I.D (mm)
Dimensions: C/S(mm)
00591-031
0.591
0.031
15
0.8
00610-030
0.61
0.03
15.49
0.76
00610-030
0.61
0.03
15.5
0.75
00622-031
0.622
0.031
15.8
0.8
00709-020
0.709
0.02
18
0.5
00730-031
0.73
0.031
18.54
0.79
00787-020
0.787
0.02
20
0.5
00840-030
0.84
0.03
21.34
0.76
00898-031
0.898
0.031
22.8
0.8
00945-024
0.945
0.024
24
0.6
00984-030
0.984
0.03
25
0.75
00988-031
0.988
0.031
25.1
0.8
00004-024
1.004
0.024
25.5
0.6
00063-024
1.063
0.024
27
0.6
00063-031
1.063
0.031
27
0.8
00280-031
1.28
0.031
32.5
0.8
00008-031
2.008
0.031
51
0.8
00047-031
2.047
0.031
52
0.8
PART No.
I.D - (in)
C/S - (in)
I.D - (mm)
C/S -(mm)
00591-031
0.591
0.031
15
0.8
00610-030
0.61
0.03
15.49
0.76
00610-030
0.61
0.03
15.5
0.75
00622-031
0.622
0.031
15.8
0.8
00709-020
0.709
0.02
18
0.5
00730-031
0.73
0.031
18.54
0.79
00787-020
0.787
0.02
20
0.5
00840-030
0.84
0.03
21.34
0.76
00898-031
0.898
0.031
22.8
0.8
00945-024
0.945
0.024
24
0.6
00984-030
0.984
0.03
25
0.75
00988-031
0.988
0.031
25.1
0.8
00004-024
1.004
0.024
25.5
0.6
00063-024
1.063
0.024
27
0.6
00063-031
1.063
0.031
27
0.8
00280-031
1.28
0.031
32.5
0.8
00008-031
2.008
0.031
51
0.8
00047-031
2.047
0.031
52
0.8

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