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Angled view of silver metal ATF filler plug socket showing six-lobed internal profile and hexagonal shank with stamped markingFront close-up of socket interior showing six-lobed star spline inside a recessed circular bore with thick outer rimThree-quarter side view of metal socket showing hexagonal shank, closed end, raised flange and stamped marking on the body

ATF Filler Plug Socket for BMW Mini, T55 Spline, 17mm Hex Drive

Specialized T55 spline socket for BMW Mini ATF filler plug removal and installation. Essential for transmission fluid service.

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Description

ATF Filler Plug Socket for BMW Mini, T55 Spline, 17mm Hex Drive

Brief Overview

This is a purpose-built specialist socket designed exclusively for accessing and servicing the ATF (Automatic Transmission Fluid) filler plug housing on BMW Mini vehicles. The tool features a precision-machined six-lobed spline interior (T55 profile) that engages the factory fill plug with zero cam-out risk—critical when handling sensitive transmission components. The 17mm hexagonal shank accepts any standard wrench or socket driver, making it compatible with your existing workshop equipment.

For shops working regularly on BMW Mini transmissions, pairing this socket with complementary BMW service tools—such as specialized drain plug wrenches and transmission service socket sets—streamlines your oil change workflow and reduces technician downtime.

Key Features

  • T55 Spline Profile: Precision six-lobed internal geometry designed to match BMW Mini OEM ATF filler plugs exactly
  • 17mm Hex Drive: Direct compatibility with standard metric wrenches and 1/2-inch socket drivers
  • Machined Construction: Hardened steel with chrome-plated finish resists corrosion and wear across multiple service cycles
  • Recessed Cup Design: Deep bore with protective outer flange prevents slippage and protects plug threads during removal/installation
  • Zero Cam-Out Risk: Spline design ensures positive engagement—eliminates stripped plugs or rounded corners

Business Advantages for Resellers

  • High-Margin Specialist Tool: ATF service on BMW Mini is routine maintenance—consistent demand from independent shops and dealership networks
  • Low Inventory Footprint: Compact single-socket design means minimal shelf space required for significant recurring revenue
  • Lock-In Customer Base: Once a shop purchases this tool, they're committed to your supply chain for replacement units and complementary BMW service sockets
  • Premium Pricing Justification: Specialized, OEM-matched tools command 35–50% higher margins than generic sockets; customers recognize the value of avoiding damaged transmission plugs

Technical Specifications

Specification Value
Socket Type Spline (Six-Lobed)
Spline Size T55
Drive Hex Size 17mm
Drive Type 1/2-inch socket driver compatible
Internal Profile Precision-machined recessed bore
Finish Chrome-plated steel
Application BMW Mini Automatic Transmission ATF Filler Plug
Length Compact cylinder with protective flange

Application & Usage

This socket is essential for any technician servicing BMW Mini automatic transmissions. During fluid changes or condition checks, the OEM filler plug requires this specialized T55 spline tool for safe removal and reinstallation. The design prevents cross-threading and plug damage—two costly failure modes that undermine customer satisfaction and create warranty disputes.

Recommended for:

  • Independent BMW/Mini specialist shops
  • Multi-brand dealerships with BMW Mini service departments
  • Fleet maintenance facilities with Mini vehicles
  • Transmission service centers

Call to Value

Stock this socket as part of your BMW service capability. It's a low-cost, high-confidence addition to your tool inventory that directly supports profitable transmission maintenance work. One socket serves dozens of vehicles across its service life—guaranteed repeat business from shops that adopt BMW-specific tooling.