Case 1427 ยท Public preview
Pin Alignment and Heat Treatment Can Combine to Produce a Ductile Shear Failure
A jackscrew assembly separated after its groove pin sheared at both sides of the joint.
SEM fractographyEDSMetallographic sectioningOptical metallographyHardness and stock-pin comparison
What the evidence preview establishes
The groove pin sheared because of the combined effects of mechanical misalignment and improper heat treatment during manufacture.
Why this case matters
A sheared retaining pin may reflect both load geometry and material condition. Compare both fracture ends, groove engagement, hardness, and microstructure before treating the failure as simple overload.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.