What governs, and how to use SpecLok's answers

SpecLok shows what manufacturer catalogs and drawings, government specifications and handbooks say, with the source linked. It is a reference, not a design authority, and it does not approve parts.

What governs

The drawing for the part or assembly, the process specification it calls out for installation and inspection, and the fastener manufacturer's installation instructions and current product drawing. Where SpecLok differs from any of them, they win. SpecLok cites the revision it read; check yours is current.

What the answers are

Part numbers and grip ranges are transcribed from the table each page cites. The grip for a hole comes from measuring that hole with the manufacturer's grip gage, not from a calculated stack.

An equivalent is labelled Identical or Approved alternate only where a cited document says so. Part numbers that share a National Stock Number in the government supply catalog (FLIS) are a supply record, not an engineering approval.

Tooling comes from the tool makers' catalogs. Confirm the nose and tool setup with the tool maker before installing.

The selector ranks fastener families by cited rules. The choice belongs to your stress, materials and manufacturing engineers.

3D models are built from printed dimensions. Features the manufacturer does not dimension are scaled from their figures and labelled as such. Use them for layout, not for manufacturing or inspection.

Prices are government award history at government quantities, not quotes.

If something looks wrong

Check the cited document. If SpecLok disagrees with it, the document is right.