malleable_cast_iron_forged_steel_and_nipple_standards_and_specifications
NACE -TM0177-96
WB1226~FundamentalsOfRockwellHardness Testing
Function of Fittings-Parker
Swagelock Fittings
Crossby-HseriesCatalog420
DIN EN 1563e 2005-10
Spring Supplement Designers g
Engineering Tech Data.
Incoloy Alloy 020[1]