---
kind: "section"
citation: "14 C.F.R. § 25.625"
title: "14"
number: "25.625"
heading: "Fitting factors."
url: "https://uscodex.org/cfr/14/25.625"
---

# §25.625. Fitting factors.


For 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—
  - (1) The fitting;
  - (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)](/cfr/14/25.785.md?p=f-3) applies.

## Notes

### Amendments

[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]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702 and 44704; Pub. L. 115-254, 132 Stat 3281 (49 U.S.C. 44903 note).

### Source

Source: Docket No. 5066, 29 FR 18291, Dec. 24, 1964, unless otherwise noted.

### Amendments

[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]