Section 25.625 - Fitting factorsFor each fitting (a part or terminal used to join one structural member to another), the following apply:
(a) For each fitting whose strength is not proven by limit and ultimate load tests in which actual stress conditions are simulated in the fitting and surrounding structures, a fitting factor of at least 1.15 must be applied to each part of- (2) The means of attachment; and(3) The bearing on the joined members.(b) No fitting factor need be used-(1) For joints made under approved practices and based on comprehensive test data (such as continuous joints in metal plating, welded joints, and scarf joints in wood); or(2) With respect to any bearing surface for which a larger special factor is used.(c) For each integral fitting, the part must be treated as a fitting up to the point at which the section properties become typical of the member.(d) For each seat, berth, safety belt, and harness, the fitting factor specified in § 25.785(f)(3) applies.Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-23, 35 FR 5674, Apr. 8, 1970; Amdt. 25-72, 55 FR 29776, July 20, 1990