Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

80 to 90%
70 to 83%
63 to 70%
45 to 60%

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Machine Design
Turn buckle has

Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
Right hand threads on bout ends

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