Wing screws, inch (type A, cold formed, ASME B18.17 family): #8 to 3/8 in wing spread, height, thickness, boss — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/wing-screws-inch-asme-b18-17/  (sheet CC BY 4.0)
Basis: CDE Fasteners' type A wing screw sheet (ASME B18.6.8-2010 as printed) cross-checked with Tanner Bolt's cold-forged wing nut sheet (ASME B18.17), whose wing and boss dimensions are the same for the shared sizes; numbers only
Catalog version: 2026-10-20

Sizes: see table below
- Inches (max / min in each cell; the last column converts the maxima of A and B to mm). Sizes #8 to 3/8 in. A wing spread, B wing height, C wing thickness, E boss diameter, G boss height. CDE prints the wing screw table under ASME B18.6.8-2010 (type A: a two-piece screw, cold-formed winged head permanently installed on the shank) and gives length tolerances by nominal length: ±0.03 in up to 1 in, ±0.06 over 1 to 2 in, ±0.09 over 2 in. No lengths are listed on that sheet.
- Cross-check: Tanner's cold-forged wing nut sheet (the ASME B18.17 table, already tabulated on wing-nuts-din-315-asme-b18-17) prints identical A, B, C, E and G max / min for #8, #10, 1/4, 5/16 and 3/8 (e.g. 1/4: A 1.10 / 0.97, B 0.57 / 0.43, C 0.18 / 0.14, E 0.50 / 0.45, G 0.22 / 0.17). The dimension D (between the wings), printed for wing nuts, is not on the wing screw sheet and is not shown. Types B and C (other head forms) were not found with numbers.
- No files: the wing outline (curve, cross-section) is not published as numbers in any table read, so no model is drawn. Metric forms: wing-screws-din-316. McMaster-Carr sells wing screws with per-part STEP; linked, not copied.

size  TPI  A wing spread (in)  B wing height (in)  C wing thickness (in)  E boss diameter (in)  G boss height (in)  mm (max)
#8  32  0.91 / 0.78  0.47 / 0.34  0.14 / 0.10  0.43 / 0.39  0.18 / 0.14  A 23.1 mm, B 11.9 mm
#10  24 & 32  0.91 / 0.78  0.47 / 0.34  0.14 / 0.10  0.43 / 0.39  0.18 / 0.14  A 23.1 mm, B 11.9 mm
1/4  20  1.10 / 0.97  0.57 / 0.43  0.18 / 0.14  0.50 / 0.45  0.22 / 0.17  A 27.9 mm, B 14.5 mm
5/16  18  1.25 / 1.12  0.66 / 0.53  0.21 / 0.17  0.58 / 0.51  0.25 / 0.20  A 31.8 mm, B 16.8 mm
3/8  16  1.44 / 1.31  0.79 / 0.65  0.24 / 0.20  0.70 / 0.64  0.30 / 0.26  A 36.6 mm, B 20.1 mm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- CDE Fasteners: Wing screws type A, cold formed (sheet cites ASME B18.6.8-2010): wing spread A, height B, thickness C, boss E and G max / min, sizes 8 to 3/8 — web — Maker datasheet; numbers only — https://cdefasteners.com/sites/default/files/product-specs/wingscrtypea.pdf
- Tanner Bolt (wing nut sheet, ASME B18.17): Cold-forged wing nuts: A, B, C, D, E, G (cross-check of the shared wing and boss dimensions) — web — Maker datasheet; numbers only — https://www.tannerbolt.com/media/akeneo_connector/Nutsforgedwing.pdf
- McMaster-Carr: Wing screws (category) — web, STEP — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/wing-screws/

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=wing-screws-inch-asme-b18-17