Hex lag screws 5/8, 3/4, 7/8 and 1 in (ASME B18.2.1): head width and height, shank, pilot holes + envelope models — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/lag-screws-hex-inch-5-8-to-1/ (sheet CC BY 4.0) Basis: AFT Fasteners' ASME B18.2.1-1996 table (5/8, 3/4, 7/8) with Engineers Edge (5/8 to 1) and Fastenermart (head and pilot holes, 5/8 and 3/4) as cross-checks; four envelope models as files Catalog version: 2026-10-20 Overall (mm): length 44.0, width 38.1, height 118.7 - Inches. Sizes 5/8, 3/4, 7/8 and 1 in extend lag-screws-hex-inch (1/4 to 1/2 in). AFT's table (it cites ASME B18.2.1-1996) stops at 7/8; the 1 in row is from Engineers Edge alone, so its basic width across flats (1-1/2) and head height (43/64) have no second source here, and its across-corners and shoulder length are left blank. AFT's flattened table was read by assigning columns from the layout (E, F, G, H, S), so check the standard if a figure matters. - Engineers Edge agrees with AFT on E, F and H for 5/8, 3/4 and 7/8. One misprint: its 7/8 row prints a basic F of '15/16' beside a max / min of 1.312 / 1.269, which is 1-5/16 (AFT prints 1-5/16); 1-5/16 is used. Fastenermart agrees on head width and height for 5/8 and 3/4 (15/16 and 27/64; 1-1/8 and 1/2). - Thread length is a rule, not a column: AFT gives a minimum of half the screw length plus 0.50 in, up to 5.00 in; short screws are threaded close to the head. Pilot holes are not part of B18.2.1: Fastenermart prints a shank hole equal to the nominal size and threaded-portion pilots by wood group (5/8: 5/16 softwood III and IV, 13/32 medium II, 29/64 hardwood I; 3/4: 13/32, 1/2, 9/16). The page has no pilot holes for 7/8 or 1 in, so none are shown. Treat pilots as a guide and follow the screw maker or the project engineer. - Files: hexagon at the basic width across flats and the basic height (corners are F / cos 30°, which AFT's G max matches, e.g. 1.083 in for 5/8) on a plain cylinder at the nominal diameter; no thread, chamfer, washer face or point. The 4 in length under the head is an example chosen by Xem, not a published length. The 1 in file uses the single-source head size. - McMaster-Carr sells lag screws with per-part STEP; its category is linked, not copied. Smaller sizes: lag-screws-hex-inch. Wood screws: wood-screws-flat-head-inch. size (in) TPI shank E max / min (in) across flats F, basic F max / min (AFT) F (Engineers Edge) across corners G max / min (AFT) head height H, basic H max / min shoulder S min (AFT) shank hole (Fastenermart) pilot, softwood III & IV pilot, medium II pilot, hardwood I 5/8 5 .642 / .605 15/16 .938 / .906 15/16 (.938 / .906) 1.083 / 1.033 27/64 .444 / .378 .312 5/8 5/16 13/32 29/64 3/4 4-1/2 .768 / .729 1-1/8 1.125 / 1.088 1-1/8 (1.125 / 1.088) 1.299 / 1.240 1/2 .524 / .455 .375 3/4 13/32 1/2 9/16 7/8 4 .895 / .852 1-5/16 1.312 / 1.269 '15/16' printed; max / min 1.312 / 1.269 1.516 / 1.447 37/64 .604 / .531 .375 — — — — 1 3-1/2 1.022 / .976 1-1/2 (Engineers Edge only) 1.500 / 1.450 1-1/2 (1.500 / 1.450) — 43/64 (Engineers Edge only) .700 / .591 — — — — — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - AFT Fasteners: Lag screws dimensions and mechanical properties (ASME B18.2.1-1996): E shank, F width across flats, G across corners, H head height, S shoulder length, thread-length rule — web — Publisher's page; dimensions are facts — https://www.aftfasteners.com/lag-screws-dimensions-and-mechanical-properties/ - Engineers Edge: Standard hex lag screws: shank diameter E, width across flats F, head height H, threads per inch, 5/8 to 1 in — web — Publisher's page; dimensions are facts — https://ns1.engineersedge.com/hardware/standard_hex_lag_screws_16077.htm - Fastenermart: Lag screws: pilot hole sizes by wood group and head dimensions (5/8 and 3/4 in rows) — web — Publisher's page; dimensions are facts — https://fastenermart.com/lag-screws.html - McMaster-Carr: Hex head lag screws (McMaster files them as hex head wood screws) (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/stainless-steel-hex-head-lag-screws Free files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/lag-screws-hex-inch-5-8-to-1/index.json API: https://xemstudio.com/api/geometry?object=lag-screws-hex-inch-5-8-to-1