Flat head socket cap screws, inch (ASME B18.3, 82° countersunk) #0 to 1-1/2: head, hex socket, key engagement + models #0 to 1 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/flat-head-socket-cap-screws-inch/ (sheet CC BY 4.0) Basis: Torqbolt's ASME B18.3 flat countersunk head table with fasten.it's ASME B18.3 Table 2A (agrees on A, H, key engagement and socket sizes; states the 82° included angle); 18 envelope models as files Catalog version: 2026-10-20 Overall (mm): length 50.8, width 49.2, height 50.8 - Inch dimensions per ASME B18.3 (flat countersunk head cap screws): body diameter D max (theoretical sharp) and absolute min, head diameter A max / min, head height H max, hexagon socket (nominal), spline socket (nominal, 3/4 and below on Torqbolt's table), key engagement min, #0 to 1-1/2. fasten.it's Table 2A prints the same A max, H max, key engagement and socket values (it also lists UNC and UNF threads per inch); both give the bearing cone as an included angle of about 82° (fasten.it) — Torqbolt does not state the angle. Column assignment of the two socket columns follows the ratios (hex sizes match the standard's hex key series, for example 5/32 for 1/4 and 3/16 for 5/16), and fasten.it's page labels them the same way. - Computed column: the cone height (A max - D) / (2 tan 41°). It agrees with the published H max to within 0.001 in for every size on the page (for example 1/4: 0.1616 against 0.161), which is why the 82° cone can be drawn from A max and D alone. - Files are Xem-drawn envelopes at true nominal size: the 82° cone from A max down to D max (flat top), a hexagon socket at the nominal across-flats size and the minimum key-engagement depth, and a plain shank at D max. No thread, no spline-socket option, no socket bottom cone, no point. Example lengths (0.25 / 0.5 / 1 / 1.5 / 2 in by size, head top to tip) are Xem's choice. Sizes 1-1/8 to 1-1/2 are in the table only. - Metric 90° flat socket screws: countersunk-screws-metric (ISO 10642). Slotted and Phillips 82° flat machine screws: machine-screws-inch-asme-b18-6-3. Socket head cap screws: socket-head-cap-screws-inch-full. size TPI UNC / UNF body D max / abs. min (in) head A max / min (in) head height H max (in) hex socket (nominal) spline socket (nominal) key engagement min (in) cone height, computed (in) head dia x height max (mm, computed) #0 — / 80 0.0600 / 0.0568 0.138 / 0.117 0.044 .035 in .048 in 0.025 0.045 3.51 x 1.12 #1 64 / 72 0.0730 / 0.0695 0.168 / 0.143 0.054 .050 in .060 in 0.031 0.055 4.27 x 1.37 #2 56 / 64 0.0860 / 0.0822 0.197 / 0.168 0.064 .050 in .060 in 0.038 0.064 5.00 x 1.63 #3 48 / 56 0.0990 / 0.0949 0.226 / 0.193 0.073 1/16 in .072 in 0.044 0.073 5.74 x 1.85 #4 40 / 48 0.1120 / 0.1075 0.255 / 0.218 0.083 1/16 in .072 in 0.055 0.082 6.48 x 2.11 #5 40 / 44 0.1250 / 0.1202 0.281 / 0.240 0.090 5/64 in .096 in 0.061 0.090 7.14 x 2.29 #6 32 / 40 0.1380 / 0.1329 0.307 / 0.263 0.097 5/64 in .096 in 0.066 0.097 7.80 x 2.46 #8 32 / 36 0.1640 / 0.1585 0.359 / 0.311 0.112 3/32 in .111 in 0.076 0.112 9.12 x 2.84 #10 24 / 32 0.1900 / 0.1840 0.411 / 0.359 0.127 1/8 in .145 in 0.087 0.127 10.44 x 3.23 1/4 20 / 28 0.2500 / 0.2435 0.531 / 0.480 0.161 5/32 in .183 in 0.111 0.162 13.49 x 4.09 5/16 18 / 24 0.3125 / 0.3053 0.656 / 0.600 0.198 3/16 in .216 in 0.135 0.198 16.66 x 5.03 3/8 16 / 24 0.3750 / 0.3678 0.781 / 0.720 0.234 7/32 in .251 in 0.159 0.234 19.84 x 5.94 7/16 14 / 20 0.4375 / 0.4294 0.844 / 0.781 0.234 1/4 in .291 in 0.159 0.234 21.44 x 5.94 1/2 13 / 20 0.5000 / 0.4919 0.938 / 0.872 0.251 5/16 in .372 in 0.172 0.252 23.83 x 6.38 5/8 11 / 18 0.6250 / 0.6163 1.188 / 1.112 0.324 3/8 in .454 in 0.220 0.324 30.18 x 8.23 3/4 10 / 16 0.7500 / 0.7406 1.438 / 1.355 0.396 1/2 in .454 in 0.220 0.396 36.53 x 10.06 7/8 9 / 14 0.8750 / 0.8647 1.688 / 1.604 0.468 9/16 in — 0.248 0.468 42.88 x 11.89 1 8 / 12 1.0000 / 0.9886 1.938 / 1.841 0.540 5/8 in — 0.297 0.540 49.23 x 13.72 1-1/8 7 / 12 1.1250 / 1.1086 2.188 / 2.079 0.611 3/4 in — 0.325 0.611 55.58 x 15.52 1-1/4 7 / 12 1.2500 / 1.2336 2.438 / 2.316 0.683 7/8 in — 0.358 0.683 61.93 x 17.35 1-3/8 6 / 12 1.3750 / 1.3568 2.688 / 2.553 0.755 7/8 in — 0.402 0.755 68.28 x 19.18 1-1/2 6 / 12 1.5000 / 1.4818 2.938 / 2.791 0.827 1 in — 0.435 0.827 74.63 x 21.01 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Torqbolt: ASME B18.3 hexagon and spline socket flat countersunk head cap screws: D, A max / min, H max, spline and hexagon socket, key engagement, #0 to 1-1/2 — web — Publisher's page; dimensions are facts — https://torqbolt.com/asme-b18-3-hexagon-and-spline-socket-flat-countersunk-head-cap-screws-dimensions-standards-specifications - fasten.it: ASME B18.3 Table 2A flat countersunk head cap screws, inch series: same A, H, key engagement and socket sizes; states a conical bearing surface with an included angle of approximately 82 degrees — web — Publisher's page; dimensions are facts — https://www.fasten.it/en/norms/norm/asme_b18.3_table_2a - Engineering ToolBox: ANSI/ASME B1.1 Unified National threads, UNC and UNF: TPI, major diameter in / mm, tap drill mm, pitch mm, #0 to 4 in — web — Publisher's page; dimensions are facts — https://www.engineeringtoolbox.com/unified-screw-threads-unc-unf-d_1809.html - McMaster-Carr: Socket head screws (cap, flat, set) (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/socket-head-screws/ Free files (CC BY 4.0, Xem Studio; STEP + STL, 18 parts): https://xemstudio.com/files/hardware/flat-head-socket-cap-screws-inch/index.json API: https://xemstudio.com/api/geometry?object=flat-head-socket-cap-screws-inch