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DDS

DDS is a manufacturer of rotary shaft seals and oil seals used in rotating equipment across industrial, mobile, and process applications. The product line is built around standardized sealing profiles — TC, TF, and related configurations — with material options that include nitrile (NBR) and fluoro (FKM) elastomers. DDS seals are commonly specified by shaft diameter, housing bore, and axial width, and are available in both metric and inch-based dimensions. The range covers small shafts starting around 11.6 mm ID up to large bores exceeding 265 mm ID, with widths from 8 mm to 16 mm and beyond in the supplied catalog. Pressure ratings vary by design and material; typical dual-lip spring-loaded seals in this line are rated to approximately 7–10 psi for the configurations shown, making them suitable for low-pressure retention and exclusion duties rather than high-pressure hydraulic service. 3G Electric supplies DDS oil seals as part of its industrial equipment distribution portfolio. The catalog includes 463 SKUs, spanning single-lip and dual-lip designs, with and without springs, for rough and smooth bore conditions. Dual-lip seals with rubber-enclosed cases are intended for rough bores where the housing surface may not be perfectly machined; the rubber enclosure helps compensate for surface irregularities and provides a secondary sealing lip that can exclude contaminants and retain grease or oil. Single-lip designs are typically used in smoother bore applications where a simpler profile is sufficient. The seals are used in pumps, gearboxes, motors, and other rotating shaft assemblies to prevent lubricant leakage and ingress of dust, water, or process contamination. Buyers selecting DDS seals should confirm shaft diameter, bore diameter, width, elastomer compatibility with the lubricant and operating temperature, and whether a spring-loaded lip is required for consistent sealing force. 3G Electric supports the DDS line with cross-reference assistance, dimensional matching, and availability across the full SKU range. The company ships globally and serves plant engineers, maintenance managers, and procurement specialists who need to identify replacement seals by dimension or manufacturer part number. DDS part numbers in this catalog typically encode the inner diameter, outer diameter, and width — for example, 8511013TC corresponds to 85 mm ID, 110 mm OD, 13 mm width, TC type — which simplifies identification when original markings are worn or documentation is incomplete. For maintenance and repair operations, having access to the full DDS size range reduces the need to substitute non-equivalent seals or modify housings. The product family is positioned for standard industrial rotating equipment rather than specialized high-speed or high-pressure applications, and material selection should account for temperature limits and chemical exposure. Nitrile seals are generally used in petroleum-based lubricants and moderate temperature ranges, while fluoro seals are selected for higher temperatures and broader chemical resistance. 3G Electric maintains inventory and sourcing for DDS seals to support both planned maintenance and emergency replacement, with the ability to quote against specific dimensions or MPNs.

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About DDS

DDS is a manufacturer of rotary shaft seals and oil seals used in rotating equipment across industrial, mobile, and process applications. The product line is built around standardized sealing profiles — TC, TF, and related configurations — with material options that include nitrile (NBR) and fluoro (FKM) elastomers. DDS seals are commonly specified by shaft diameter, housing bore, and axial width, and are available in both metric and inch-based dimensions. The range covers small shafts starting around 11.6 mm ID up to large bores exceeding 265 mm ID, with widths from 8 mm to 16 mm and beyond in the supplied catalog. Pressure ratings vary by design and material; typical dual-lip spring-loaded seals in this line are rated to approximately 7–10 psi for the configurations shown, making them suitable for low-pressure retention and exclusion duties rather than high-pressure hydraulic service. 3G Electric supplies DDS oil seals as part of its industrial equipment distribution portfolio. The catalog includes 463 SKUs, spanning single-lip and dual-lip designs, with and without springs, for rough and smooth bore conditions. Dual-lip seals with rubber-enclosed cases are intended for rough bores where the housing surface may not be perfectly machined; the rubber enclosure helps compensate for surface irregularities and provides a secondary sealing lip that can exclude contaminants and retain grease or oil. Single-lip designs are typically used in smoother bore applications where a simpler profile is sufficient. The seals are used in pumps, gearboxes, motors, and other rotating shaft assemblies to prevent lubricant leakage and ingress of dust, water, or process contamination. Buyers selecting DDS seals should confirm shaft diameter, bore diameter, width, elastomer compatibility with the lubricant and operating temperature, and whether a spring-loaded lip is required for consistent sealing force. 3G Electric supports the DDS line with cross-reference assistance, dimensional matching, and availability across the full SKU range. The company ships globally and serves plant engineers, maintenance managers, and procurement specialists who need to identify replacement seals by dimension or manufacturer part number. DDS part numbers in this catalog typically encode the inner diameter, outer diameter, and width — for example, 8511013TC corresponds to 85 mm ID, 110 mm OD, 13 mm width, TC type — which simplifies identification when original markings are worn or documentation is incomplete. For maintenance and repair operations, having access to the full DDS size range reduces the need to substitute non-equivalent seals or modify housings. The product family is positioned for standard industrial rotating equipment rather than specialized high-speed or high-pressure applications, and material selection should account for temperature limits and chemical exposure. Nitrile seals are generally used in petroleum-based lubricants and moderate temperature ranges, while fluoro seals are selected for higher temperatures and broader chemical resistance. 3G Electric maintains inventory and sourcing for DDS seals to support both planned maintenance and emergency replacement, with the ability to quote against specific dimensions or MPNs.

Common Applications

  • Pump shaft sealing — DDS dual-lip TC-type seals in nitrile or fluoro for rough bore housings
  • Gearbox input and output shafts — DDS TF-type spring-loaded seals to retain lubricant and exclude dust
  • Electric motor bearing housings — DDS single-lip or dual-lip seals sized by shaft and bore dimensions
  • Rotating equipment maintenance — DDS oil seals identified by MPN or measured ID, OD, and width for replacement
  • Process industry mixers and agitators — DDS fluoro seals for chemical and temperature resistance
  • Mobile and off-highway drivetrains — DDS nitrile seals for moderate-temperature grease and oil retention

Frequently asked questions

Common questions about DDS from 3G Electric.

What is the difference between DDS TC-type and TF-type oil seals?

In the DDS catalog, TC and TF designations refer to seal profile and construction. TC-type seals typically have a rubber-enclosed case with a dual-lip, spring-loaded design, often in fluoro or nitrile material. TF-type seals also feature a dual-lip, spring-loaded configuration but may differ in case style or lip geometry. Both are intended for rotating shaft applications. The correct choice depends on bore condition, shaft speed, lubricant, and temperature. Confirm the specific MPN and material before ordering, as the same nominal dimensions can be supplied in different profiles.

What does the DDS part number 8511013TC indicate?

The DDS MPN 8511013TC encodes the seal dimensions and type: 85 mm inner diameter, 110 mm outer diameter, 13 mm width, and TC-type construction. This is a dual-lip oil seal with a rubber-enclosed case for rough bores, made of fluoro material, with a maximum pressure rating of 7 psi. When replacing a worn seal, verify all three dimensions and the profile code against the original or the housing and shaft measurements.

Are DDS oil seals available in both nitrile and fluoro materials?

Yes. The DDS range supplied by 3G Electric includes seals in nitrile (NBR) and fluoro (FKM) elastomers. Nitrile is commonly used with petroleum-based oils and greases in moderate temperature ranges. Fluoro offers higher temperature resistance and broader chemical compatibility. Material selection should be based on the lubricant, operating temperature, and any exposure to process fluids or cleaning agents. The same dimensional seal may be available in either material, so specify the required elastomer when requesting a quote.

What bore conditions are DDS dual-lip rubber-enclosed seals designed for?

DDS dual-lip oil seals with rubber-enclosed cases are intended for rough bores. The rubber enclosure helps seal against the housing bore even when the surface finish is not ideal, and the secondary lip provides additional exclusion of contaminants. These seals are used in pumps, gearboxes, motors, and similar rotating equipment. For smooth, precisely machined bores, a single-lip or non-enclosed design may be sufficient. Always check housing bore tolerance and surface finish recommendations for the specific seal.

How do I cross-reference a DDS oil seal to another brand?

Cross-referencing is typically done by matching inner diameter, outer diameter, width, and seal type. DDS MPNs often embed these dimensions — for example, 26529016TC indicates 265 mm ID, 290 mm OD, 16 mm width, TC type. If the original seal is unmarked, measure the shaft, housing bore, and seal width, and note the lip configuration and material. 3G Electric can assist with dimensional matching across the DDS range, but final verification against operating conditions remains the specifier's responsibility.

What pressure can DDS rotary shaft seals handle?

Pressure ratings vary by seal design and material. In the DDS catalog, dual-lip spring-loaded seals are shown with maximum pressure ratings around 7 to 10 psi for the configurations listed. These seals are intended for low-pressure retention and exclusion duties, not high-pressure hydraulic applications. If the application involves significant pressure differential across the seal, a different seal type or a support ring may be required. Confirm the rating for the specific MPN before use.