BTC / BTL 4.8 / 6.3 / Single Wire Seal / ∅ 3.4 - ∅ 3.7 (FLR) / Blue

The Component: Genuine Bosch Automotive Single Wire Seal (SWS) / High-grade weather-resistant silicone rubber construction / High-visibility Blue color identifier / Engineered for the Bosch BTL and BTC terminal families (4.8mm and 6.3mm series cavity architectures) / Component Part Number: 1928301086 / Bosch Order Reference: 1 928 301 086.

Applications & Fitment: Designed to establish a flawless, moisture-proof IP-rated environmental seal around individual automotive conductors within heavy-duty electrical connector housings. This authentic blue silicone single wire seal is specialized for the larger-profile Bosch BTL and BTC series housings, which typically service high-current terminal contacts like the 4.8mm and 6.3mm flat receptacles. It is standard equipment on European passenger vehicles, commercial trucks, and motorsport wire harnesses where wiring pass-throughs must be isolated against water ingress, fuel, engine oil, road grime, and salt spray.

Common deployment areas include heavy-duty under-hood junctions, primary radiator cooling fan modules, glow plug relays, power distribution boxes, and inline chassis ground links. The seal is pushed over the wire insulation before the terminal is crimped, allowing its outer triple-ribbed sealing rings to compress perfectly inside the housing cavity for a long-term gas-tight fit. Essential stock for professional auto-electrical workshops, wiring loom builders, and bulk wholesale distributors.

Technical Attributes:

- Manufacturer Part Number: 1928301086 / 1 928 301 086 (Brand: Bosch Automotive)

- Product Series Family: BTL Series / BTC Series (Large Cavity Systems)

- Component Type: Single Wire Seal (SWS) / Cavity Wire Grommet

- Material Composition: Heavy-Duty Silicone Rubber (High thermal stability and oil resistance)

- Component Color: Blue (Bosch size/wire-range specific color-coding)

- Terminal Width Compatibility: Optimized for 4.8mm and 6.3mm terminal series connector cavities

- Environmental Protection Rating: Capable of achieving IP67 / IP69K sealing performance when correctly assembled within matching Bosch housings

- Wire Insulation Diameter Compatibility: Engineered to grip securely on larger heavy-gauge automotive wire insulations (typically matching 2.50 mm² to 4.00 mm² wire cross-sections or heavy-wall 14-12 AWG profiles)

- Structural Design: Multi-ribbed outer profile for progressive sealing compression with a tight inner collar to prevent fluid bypass along the wire insulation jacket

- Procurement Options: Packaged loose for individual harness assembly, repair kits, or industrial bulk reels. Wholesale trade tiers apply instantly to trade accounts.