Materials of Construction for BI-Lok Tube Fittings

Component Fitting Material
Brass 316 Stainless Steel
Fitting Body Forged ASTM B124, CDA 377 ASTM A182
Bar Stock ASTM B16, CDA 360 ASTM A479
Front Ferrule
Back Ferrule
Stainless Steel BI-Lok fitting bodies and nuts are Heat/Lot code traceable.
Contact factory Customer Service Department for MTR documentation.


BI-Lok Dual Ferrule Tube Fittings are fully compatible for use with the Swagelok® brand Gap Inspection Gauges.


BI-Lok Series D Dual Ferrule Fittings are manufactured to be completely component intermixable with other popular brands of dual ferrule instrumentation tube fittings.