Xem Studiomeasured geometry

Library › Hardware › Plain washers, inch Type B (narrow, regular, wide): #0 to 3 in ID…

1/2 in Type B plain washer, regular series

1/2 in Type B plain washer, regular series: ID 0.531 in (13.49 mm), OD 1.250 in (31.75 mm), thickness 0.100 in (2.54 mm), basic sizes; flat annulus, no tolerances

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

screw size1/2
decimal size (in)0.5
seriesregular
ID (in)0.531
OD (in)1.250
thickness (in)0.100
ID (mm)13.49
OD (mm)31.75
thickness (mm)2.54
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

Plain washers, inch Type B (narrow, regular, wide): #0 to 3 in ID, OD, thickness + 12 washer files: every size, notes, mating features and sources. What are the dimensions of a Type B narrow, regular or wide flat washer, and what is the OD of a 3/8 wide washer?

Other sizes