ConFlat (CF) knife-edge vacuum flanges to ISO 3669: flange OD, bolt circle, hole count and diameter, thickness, tapped thread, 1.33 to 8 in + bolt-pattern templates — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/conflat-cf-flanges/ (sheet CC BY 4.0) Basis: Neyco's CF flange catalogue table (fixed blank flanges), cross-checked against Kurt J. Lesker's catalogue and two Vacgen listings, read in this session; numbers and bolt-pattern templates only Catalog version: 2026-10-20 Overall (mm): length 203.0, width 203.0, height 6.0 - A ConFlat (CF) flange is the all-metal UHV flange: a knife edge on each face bites into a copper gasket. North American sizes are named by the flange OD in inches (1.33, 2.75, 4.5, 6, 8 in); European sizes by the nominal tube ID in mm (DN16CF, DN40CF, DN63CF, DN100CF, DN160CF). The standard is ISO 3669 (the 2020 edition is marked withdrawn, revised as ISO 3669:2026; its summary prints a knife edge height 0.65 ± 0.05 mm; no other numbers of it were readable). - Table: Neyco page F8, 'fixed blank flange' P/N F16, F35, F63, F100, F150; mm. The OD is the column printed D1, the bolt circle PCD, the hole diameter BH and the thickness the column printed A; the extracted text does not define these letters, so they are matched by value to the other sources below. DN as printed by Neyco: 16, 35, 63, 100, 150; 2.75 in is also sold as DN40CF and 8 in as DN160CF. - Cross-checks: Lesker's catalogue (extracted text, third data column unlabelled) gives 6 holes, hole 0.172 in, tapped 8-32, bolt circle 1.062 in (26.9 mm) for 1-1/3 in; 6, 0.265 in (6.73 mm), 1/4-28, 2.312 in (58.7 mm) for 2-3/4 in; 8, 0.332 in (8.4 mm), 5/16-24, 3.628 in (92.2 mm) for 4-1/2 in; and rows for 2-1/8 in (4 holes, 1.625 in) and 3-3/8 in (8 holes, 2.850 in) that Neyco does not list. Lesker's 6 and 8 in rows were not in the text read. Bolt circles agree within rounding (Neyco 27 / 58 / 92 against Lesker 26.9 / 58.7 / 92.2 mm and Vacgen 27 / 58.7 / 181). - Disagreements, shown not resolved: hole 6.7 (Neyco), 6.73 (Lesker) and 6.8 (Vacgen 70 mm) on the 2.75 in flange; 8.3 (Neyco) against 8.4 mm (Lesker) on the 4.5 in; thickness 12.7 (Neyco A) against 13 (Vacgen B) on 2.75 in, and 22.3 against 22 on 8 in; Vacgen's 34 mm listing prints the tapped thread as M6, Neyco M4 and Lesker 8-32 (M4). The Vacgen 203 mm listing also prints a Ø8.4 mm hole against Neyco 8.3. - Vacgen's listings add: 70 mm flange: land thickness 4.8, bolt circle 58.7; 203 mm flange: land thickness 9.5. These are a maker's own dimensions for those parts, not standard values. Knife-edge diameter, groove diameter and gasket sizes were not read from any source and are not given. - Files: CF bolt-pattern templates, one per size, drawn with Neyco's OD, bolt circle, hole count and hole diameter. 6 mm thickness (the catalogue flange thickness is in the table), the central aperture (half the bolt circle) and the first hole position (on +X) are Xem choices; the knife edge, bore and tube are not modelled. Hole position relative to the axis (straddling or on it) is not given by the sources. - Small flanges are on iso-kf-flanges-nw10-nw50 and large ISO flanges on iso-k-iso-f-flanges-dn63-dn630. McMaster-Carr's vacuum-fittings category is linked for per-part STEP. size (OD) DN (Neyco) flange OD (mm) bolt circle (mm) holes hole Ø (mm) tapped thread thickness A (mm) CF 1.33 in 16 34 27 6 4.3 M4 7.6 CF 2.75 in 35 (also DN40) 70 58 6 6.7 M6 12.7 CF 4.50 in 63 114 92 8 8.3 M8 17.4 CF 6.00 in 100 152 130 16 8.3 M8 19.9 CF 8.00 in 150 (also DN160) 203 181 20 8.3 M8 22.3 Lesker 1-1/3 in — — 1.062 in (26.9 mm) 6 0.172 in (4.3 mm) 8-32 (M4) — Lesker 2-3/4 in — — 2.312 in (58.7 mm) 6 0.265 in (6.73 mm) 1/4-28 (M6) — Lesker 4-1/2 in — — 3.628 in (92.2 mm) 8 0.332 in (8.4 mm) 5/16-24 (M8) — Lesker 2-1/8 in (not in the Neyco table) — — 1.625 in 4 0.265 in 1/4-28 — Lesker 3-3/8 in (not in the Neyco table) — — 2.850 in 8 0.332 in 5/16-24 — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Neyco (CF flange catalogue, page F8): Fixed blank CF flanges F16 to F272: DN, A, D1, GR, PCD, BH, bolt holes count, tapped thread; letters not defined in the extracted text — web — Maker catalogue; numbers only — https://www.neyco.fr/uploads/media/category/0001/03/Vacuum-F-Brides-CF.pdf - Kurt J. Lesker (catalogue, extracted text): Flanges, fittings and components: CF fixed flange standard dimensions (bolts, hole diameter, tapped thread, bolt circle); size lists for KF 1-4 and ISO 1-5 — web — Maker catalogue copy; numbers only. Column letters were not labelled in the extracted text — https://www.acomee.com.mx/catalogos/catalogosk/KURT-J-LESKER FLANGES, FITTINGS AND COMPONENTS.pdf - Vacgen (CFR34-6 listing): 304L rotatable bored CF flange 34 mm OD (DN16): flange thickness B 7.6, bolt circle F 27, 6 holes of 4.3 mm, tapped thread printed M6 — web — Maker listing; numbers only — https://vacgen.com/34mm-od-6mm-id-304l-rotable-bored-cf-flange - Vacgen (CF70-41 listing): 304L fixed bored CF flange 70 mm OD: clear bore A 40, flange thickness B 13, land C 4.8, counter bore D 41.3, bolt circle F 58.7, clear holes 6.8 mm, 6 holes, tapped M6 — web — Maker listing; numbers only — https://vacgen.com/70mm-od-41mm-id-304l-fixed-bored-cf-flange - Vacgen (CF203 listing): 316LN fixed bored CF flange 203 mm OD: OD 203, flange thickness B 22, land C 9.5, bolt circle F 181, 20 holes of 8.4 mm, tapped M8 — web — Maker listing; numbers only — https://vacgen.com/203mm-od-153mm-id-316ln-2d-fixed-bored-cf-flange - ISO (iTeh catalogue): ISO 3669:2020 Vacuum technology - Dimensions of knife-edge flanges (withdrawn, revised as ISO 3669:2026); knife edge height 0.65 ± 0.05 mm — web — Publisher's page; dimensions are facts — https://standards.iteh.ai/catalog/standards/iso/02727f16-c080-4811-8a11-c40453bd9e38/iso-3669-2020 - McMaster-Carr: Vacuum fittings (KF / ISO flanges) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/vacuum-fittings/ No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=conflat-cf-flanges