Shoulder Thorn is a 5 x Shoulder Mandrel set designed for precise shoulder alignment in mechanical assemblies. The set features a durable 40Cr alloy steel construction with a black oxide finish and a two-tone appearance (Silver Tone and Black). Key specifications - Package content: 5 x Shoulder Mandrel - Main color: Silver Tone, Black - Material: 40Cr alloy steel - Finish: Black oxide - Weight: 131 g - Hardness: HC40-44 - Head style: Socket Cap - Drive type: Hex Socket - Thickness: 12.9 - Thread: Grade A; Thread cover: Partial Thread - Thread diameter: M6 - Thread length: 12 mm - Shoulder size: diameter 8 mm; shoulder length 50 mm Shoulder size and compatibility - Shoulder diameter: 8 mm - Shoulder length: 50 mm - Threaded portion: M6, 12 mm long - Suitable for applications requiring a hex socket drive and a socket cap head with partial thread engagement Practical use scenarios - Aligning and mounting components on small machinery or fixtures where precise shoulder seating is needed and an M6 thread is compatible - Replacing or fabricating fixtures in repair work that requires a compact 8 mm shoulder and 50 mm shoulder length - As a set of reliable, repeatable shoulder mandrels for machining, assembly, or DIY projects that demand consistent dimensions and a hex drive Notes - All dimensions are provided to support accurate selection for compatible assemblies - The 5-pack provides multiple identical units for bulk or paired applications