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Specification for the tapping of holes to receive wire thread inserts (UNC and UNF threads) -- Diameters below ¼ in
This British Standard comprises three sections:
Section 1, which specifies limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from No. 2 to No. 12 UNC and UNF;
Section 2, which recommends screwing taps intended to produce holes to the limits of size specified in Section 1;
Section 3, which gives a recommended gauging system for checking the tapped holes.
Limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from No. 2 to No. 12 UNC inclusive and from No. 2 to No. 12 UNF inclusive.
Recommendations for general dimensions and limits of size on the threaded portion of screwing taps intended to produce holes to the limits specified.
Details of a recommended gauging system for checking them.
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