https://apexvacuum.com/product/nw16-blank-flanges-an-pn-qf16-sb-apex-pn-kf16-cf/
NW16 Blank Flanges A&N PN: QF16-SB & Apex PN: KF16-CF - Apex Vacuum
blank flanges
https://keyhigh.com/product/247/nw-flanges-blank-off-weld-ring-centering-rings-316l-stainless-steel
NW Flanges, Blank Off, Weld Ring, Centering Rings, 316L Stainless Steel | Key High
https://www.htcvacuum.com/jp-jp/vacuum-components/vacuum-flanges/cf-flanges/cf16-bored-blank-neck-nonrotatable
CF16 Bored Blank(Neck-Nonrotatable) | CF Flanges : Htc vacuum
CF16 Bored Blank(Neck-Nonrotatable) | CF Flanges : Htc vacuum
cf flangesboredblankneckhtc