Xem Studiomeasured geometry

Library › Hardware › Hex cap screws and heavy hex screws, inch 7/8 to 1-1/2 (ASME…

hex cap screw 1-1/8-7 UNC envelope

hex cap screw 1-1/8-7 UNC envelope: hex head 1.688 in across flats x .718 in high (F max, H max), plain shank Ø1.1250 in (major diameter, thread not drawn), 4 in under the head (example length, Xem choice); published thread length LT 2.500 in (L ≤ 6 in)

Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

stylehex cap screw
size (in)1-1/8
UNC / UNF TPI7 / 12
E body dia max / min1.1250 / 1.1140
F across flats max / min1.688 / 1.631
G across corners max / min1.949 / 1.859
H head height max / min.718 / .658
J wrenching height min (cap only).461
LT thread length, L ≤ 6 in2.500
LT thread length, L > 6 in2.750
file: F max / H max (mm)42.88 / 18.24
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

From the full sheet

Hex cap screws and heavy hex screws, inch 7/8 to 1-1/2 (ASME B18.2.1): across flats F, head height H, thread length LT: every size, notes, mating features and sources. What are the head size, head height and thread length of a 7/8, 1, 1-1/8, 1-1/4, 1-3/8 or 1-1/2 inch hex cap screw or heavy hex screw?

Other sizes