MIL-DTL-18492B (OS)
AMERICAN WELDING SOCIETY (AWS)
AWS D17.2/D17.2M
Specification for Fusion Welding for Aerospace
Applications
(Copies of these documents are available online at https://www.aws.org or from the American Welding
Society, 550 N. LeJeune Rd., Miami, FL 33126)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 General manufacture. Manufacture of all parts shall proceed in accordance with the requirements of
the contract, purchase order or requisition, appropriate drawings, and this specification.
3.2 Materials. All materials used in the manufacture of these tanks shall conform to the specifications
listed herein and to the specifications referred to on respective drawings, unless specific approval in
writing, covering a departure therefrom, has been obtained from the Government prior to manufacture or
use. When alternate materials or methods of manufacture are specified, the bidder's selections shall be
stated clearly in the proposal.
3.3 Conformance to drawings. All dimensions shall be accurate within the tolerances specified on the
drawings or in the applicable specification, unless otherwise stated in the contract, purchase order, or
requisition.
3.4 Surface. All parts shall be finished as prescribed on the applicable drawings and specifications unless
otherwise stated in the contract.
3.5 Interchangeability. All parts shall be capable of interchangeable assembly without interferences,
binding, or misalignment. All parts comprising a permanent joint unit (as welding) and the unit thus
formed shall be capable of interchangeable joining in the assembled unit and assembly.
3.6 Gages. The contractor shall provide whatever production gages are necessary and adequate to ensure
complete interchangeability of all parts, and to determine that all dimensions are within the tolerance
shown on the applicable drawings. If so stipulated in the procurement document, the Government will
furnish drawings of pertinent Navy Final Inspection Gages for guidance in design of the contractor's
inspection gages. Such procedures shall not serve to relieve the contractor of his responsibility in design
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