What electronic groupset components use 2mm hex fasteners?

Shimano Di2 junction box covers (SM-JC41, SM-JC130), battery mount screws on frames with internal Di2 batteries, and some SRAM eTap component covers use 2mm hex.

Is 2mm hex the same as 2mm Allen key?

Yes — hex key and Allen key are the same tool. A 2mm Allen key and a 2mm hex key are identical.

IceToolz

Icetoolz 2mm TwinHead Hex Key Wrench

Name: Icetoolz 2mm TwinHead Hex Key Wrench
Brand: IceToolz
SKU: CMB_EAS_4718152722201
Price: 450.00 INR
Availability: InStock
Author: InstaSport Editorial

₹450.00

Description

The IceToolz 2mm TwinHead Hex Key is the precision micro-fastener specialist in cycling maintenance. 2mm hex bolts appear on electronic groupset covers, Di2 battery mounts, some saddle rail clamp inserts, and precision adjustment interfaces where small size is an engineering requirement. At 2mm, too