The Skidmore Wilhelm test

CHICAGO, IL – Today WJE, Ibarra Group were on site to perform the Skidmore Wilhelm test, bolt testing. This test is the pre-installation verification tension testing to measure fastener performance. General fastener testing is done to determine torque/tension relationships and is tested on bolts, lock nuts and direct tension indicating washers.

Skidmore Wilhelm’s hydraulic tension calibrator, or bolt tension calibrator, has been the industry standard for testing high-strength bolts since its invention in the 1950’s. The units are required to be used on steel buildings, bridges and other structures using fasteners in tension critical joints.

Below are photos of the unit. There are five manila envelopes, each labeled for the five different bolt sets used. Three bolt, washer, nut sets were tested out of each of the five lots.