Technical Service Bulletins

Belleville Springs & Washers

D73321.10 Belleville Maximum Deflection Correction 2-13-2017
D73321.11 Belleville Hardness Correction 4-24-2018
D73321.12 Belleville Flat Load Correction 8-12-2019
D73321.13 H-13 Hardness Change 1-30-2020
D73321.14 Belleville Minimum Overall Height Correction 5-4-2020
D73321.15 New Solon Washer Tolerance Scheme 9-14-2020
D73321.16 Elimination of Black Oxide Finish on New H13 Flange Washers 
D73321.19 Standard 17-7PH Condition Now TH1050 Per AMS2759/3 Rev J 6-4-2024
D73321.20 Elimination of Preset From Some Belleville Designs

For questions regarding Technical Service Bulletins, please contact our Engineering team. 

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