How to Measure a U-Bolt
U-bolts require more than one dimension; leg length alone does not identify the part.

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QUICK RULE
U-bolts require more than one dimension; leg length
alone does not identify the part.
INSIDE WIDTH
LEG LENGTH
ROD DIA
ROD DIAMETER: nominal rod/thread diameter.
INSIDE WIDTH: clear distance between legs as specified by the applicable drawing.
LEG LENGTH: measure from the specified inside/bearing datum to the ends; conventions vary by
drawing.
BEND/RADIUS: identify round, square or custom bend geometry.
THREAD LENGTH: measure usable thread on each leg.
For replacement U-bolts, copy the OEM drawing/datum rather than assuming a universal
convention.
IDENTIFICATION ORDER
Product -> diameter -> thread -> length -> head/drive -> grade/material -> finish -> governing specification
REFERENCE ONLY. Verify the current ASME/SAE/ASTM/ISO/OEM standard and manufacturer data. Do not use as the sole basis for critical fastener selection or installation.
Fastener Guide reference FG-806D32 · thefastenerapp.com/fastener-guide/measure-and-identify/how-to-measure-a-u-bolt · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

























