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Black rectangular ThinkPad Ultra Dock with side connector and 135W adapter

Lenovo

Lenovo ThinkPad 40AJ0135US Ultra Dock with 135W Adapter

SKU CH-K1M8-MWKYF

Mechanical side-connector dock for select ThinkPad models, driving three external monitors and delivering 85 W output power with a 135 W adapter included

  • Measurements14.88 × 6.26 × 2.13 in
  • Product colorBlack
  • Compatible withThe dock is only compatible with qualified LAN enabled lapto
  • Product weight1.76 lb (0.8 kg)
  • Connect up to three external monitors via two DisplayPort 1.4 and one HDMI 2.0
  • Charge your ThinkPad with 85 W output power using the included 135 W adapter
  • Transfer data at 10 Gbps through two USB-C and four USB 3.1 ports
  • Secure side connector docks compatible ThinkPad models without drivers
  • Compact 14.88 x 6.26 x 2.13 in design weighs 1.76 lbs

Compatibility & Connector

This Lenovo ThinkPad 40AJ0135US Ultra Dock uses a proprietary side docking connector. It works only with qualified LAN‑enabled ThinkPad models such as the A285, A485 and L13 series. The package includes a 135 W AC adapter with a US Type B plug.

Who It Suits

The station targets enterprise users who need a driver‑free way to attach up to three external monitors and multiple USB peripherals. It delivers 85 W of power to the laptop and supports Wake‑on‑LAN, PXE Boot and vPro features. Buyers whose laptops lack the required side connector cannot use this dock.

Deciding Specification

The single decisive detail is the ThinkPad Side Docking Connector requirement. Only notebooks equipped with that specific mechanical interface will physically connect and function with this Ultra Dock.

How it compares

Measured against everything we stock in USB-C & Laptop Docking Stations, at today’s prices. Recalculated every night.

Price $45.99
Cheaper than about 73% of the 1,971 comparable items (median $81.99).

Specifications

Product
Brand nameLenovo
Model name40AJ0135US
Part numberSD20W51390
Product colorBlack
Size & build
Measurements14.88 × 6.26 × 2.13 in
Product weight1.76 lb (0.8 kg)
Compatibility
Compatible withThe dock is only compatible with qualified LAN enabled laptops (please check the LAN port on your machine): Lenovo ThinkPad A285 20MW, 20MX; Lenovo ThinkPad A485 20MU, 20MV; Lenovo ThinkPad L13 20R3, 20R4; Lenovo ThinkPad L13 Gen 2 20VH, 20VJ, 21AB, 21AC; Lenovo ThinkPad L13 Yoga 20R5, 20R6; Lenovo ThinkPad L13 Yoga Gen 2 20VK, 20VL, 21AD, 21AE; Lenovo ThinkPad L14 Gen 1 20U1, 20U2, 20U5, 20U6; Lenovo ThinkPad L14 Gen 2 20 × 1, 20 × 2; Lenovo ThinkPad L15 Gen 1 20U3, 20U4, 20U7, 20U8; Lenovo ThinkPad L15 Gen 2 20 × 3, 20 × 4; Lenovo ThinkPad L490 20Q5, 20Q6; Lenovo ThinkPad L590 20Q7, 20Q8;

Questions about this item

How do I connect the ThinkPad Ultra Dock 40AJ0135US to my laptop, and which step is often missed?

Align the side docking connector on the dock with the port on your compatible ThinkPad and press firmly until it clicks; the step users miss is verifying the laptop has the required side connector before purchase.

What part of the ThinkPad Ultra Dock 40AJ0135US will need replacement first?

The 135 W AC adapter with its Type B plug is the component most likely to wear out before the dock itself.

What thermal limit appears first when the ThinkPad Ultra Dock 40AJ0135US runs under sustained load?

The dock is rated for a maximum operating temperature of 35 °C; exceeding this will trigger throttling or shutdown before any other limit is reached.

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