The Structural Engineer > Archive > Volume 64 (1986) > Issues > Issue 4 > A Field Problem with Preload of Large A490 Bolts
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A Field Problem with Preload of Large A490 Bolts

This paper documents a field bolt-testing programme using ultrasonic methods. Test procedures are described and results tabulated for field observation of 1 in A490 and 1 1/4 in A490 bolts installed in oversize and standard holes. The effect on bolt pre-tension of placing 5/16in-thick hardened washers under the bolt head and nut of 1 1/4 in A490 bolts in oversize holes was the prime goal of the testing programme. J.S. Notch