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Oil Seals Design

MATERIAL

  • NBR (Nitrile)
  • PTFE (Polytetrafluoro Ethylene)
  • HNBR (Hydrogenated NBR)
  • ACM (Polyacrylate)
  • EPDM (Ethylene Propylene Diene)
  • PU (Polyurethane)
  • VMQ (Silicone)
  • CR (Chloroprene Rubber)
  • FKM (Fluorocarbon)
  • SBR (Styrene Butadiene Rubber)

STANDARD

  • JIS
  • ASTM
  • DIN
  • BS
  • SAE

SIZE

  • Metric
  • Inch

EQUIPMENTS

  • For material research: tensile testers, hardness testers, oscillating disc Rheometers, etc.
  • For design and R&D: scal life testers, radial load testers, etc.
  • For production: automatic CNC lathes, rubber compound kneaders, rubber cutters, rubber slicers, low temperature storage, sanding machines, bonding machines, rubber compression molding machines, trimming machines, etc.
  • For QC: Micro-Vu, hardness testers, etc.

OIL SEAL CHARACTERISTICS

TC Type
TA Type

Seal I.D. Tolerance Chart - Inch

SHAFT I.D. Tolerance Spring loaded Tolerance
up to 0.500 -0.027 +0.004/-0.008 -0.039 ±0.008
0.501～1.000 -0.032 -0.044
1.001～2.000 -0.035 +0.006/-0.012 -0.053 ±0.012
2.001～3.000 -0.040 -0.060
3.001～4.000 -0.048 -0.068
4.001～6.000 -0.056 -0.076
6.001～10.000 -0.062 +0.008/-0.016 -0.086 ±0.016
10.001～13.000 -0.070 -0.094
13.001～16.000 -0.078 -0.102
16.001～20.000 -0.086 -0.110
20.001～40.000 -0.120 +0.010/-0.020 -0.157 ±0.020
40.001～ -0.140 +0.012/-0.020 -0.178 ±0.024

Seal O.D. Tolerances Chart – Inch

Bore Diameter Metal case Tolerance Rubber covered case Tolerance G type Tolerance
up to 1.000 +0.004 ±0.002 +0.006 ±0.003 +0.010 ±0.003
1.001～2.000 +0.007 +0.012 ±0.004
2.001～3.000 +0.008 +0.014
3.001～4.000 +0.005 +0.010 ±0.004 +0.016
4.001～6.000 +0.003/-0.002 +0.012 +0.016 +0.006/-0.004
6.001～8.000 +0.006 +0.018
8.001～10.000 +0.008 +0.004/-0.002 +0.014 +0.020
10.001～20.000 +0.006/-0.002 +0.016 ±0.005 +0.022 +0.008/-0.004
20.001～40.000 +0.008/-0.002 +0.018 ±0.006 +0.024
40.001～60.000 +0.010/-0.002 +0.020 ±0.007 +0.026 +0.010/-0.004

Seal Width Tolerances Chart – Inch

Width Tolerance
All width +0.015/-0.015

Seal I.D. Tolerance Chart - Metric

SHAFT I.D. Tolerance Spring loaded Tolerance
＜10.00 -0.60 +0.10/-0.20 -0.90 ±0.20
10.01～18.00 -0.70 -1.00
18.01～30.00 -0.80 -1.10
30.01～50.00 -0.90 +0.15/-0.30 -1.40 ±0.30
50.01～80.00 -1.10 -1.60
80.01～120.00 -1.30 -1.80
120.01～180.00 -1.50 -2.00
180.01～250.00 -1.60 +0.20/-0.40 -2.20 ±0.40
250.01～300.00 -1.80 -2.40
300.01～400.00 -2.00 -2.60
400.01～500.00 -2.20 -2.80

Seal O.D. Tolerances Chart – Metric

Bore
Diameter		 Metal case
Tolerance		 Rubber covered case
Tolerance		 G type
Tolerance
＜10.00 +0.20/+0.10 +0.30/+0.15 +0.40/+0.20
10.01～18.00
18.01～30.00
30.01～50.00
50.01～80.00 +0.23/+0.13 +0.35/+0.20 +0.45/+0.25
80.01～120.00 +0.25/+0.15 +0.50/+0.30
120.01～180.00 +0.28/+0.18 +0.45/+0.25 +0.55/+0.35
180.01～250.00 +0.30/+0.20 +0.70/+0.40
250.01～300.00
300.01～400.00 +0.35/+0.23 +0.55/+0.30 +0.75/+0.45
400.01～500.00

Seal Width Tolerances Chart – Metric

Width Tolerance
＜10.00 +/-0.20
10.00 +/-0.30

HYDRODYNAMIC FEATURES - HELIX DESIGNS

The helix can improve the performance of sealing lip by pushing the medium back into the fluid reservoir.
The helix applies to all rotary seals. There are three types available: Bi-directional (W Type) and Single direction (R Type and L Type):

W Type

L Type

R Type

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