| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastening member hard to generate seizure even under a condition where use of lubricant is prohibited or limited.SOLUTION: In a standard state where the cross sectional shapes of respective pressure side flanks 11, 21 of metal male screw member 1 and female screw member 2 are bent so as to be set to a convex shape or concave shape, their axial cores are coincident with each other, and the load of fastening is not applied, a thread 1s of the male screw member 1 including the convex-shaped pressure side flank 11 and a tread 2s of the female member 2 including the concave-shaped pressure side flange 21 are set so as not to contact with each other. In a case where the load in fastening is applied, the pressure side flanks 11, 21 of the male screw member 1 and female screw member 2 can be subjected to surface contact with each other.SELECTED DRAWING: Figure 8 |
