Designation: F /F M â 07 Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series1 This. ASTM F/FM: Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series. Designation: F /F M – 05 Standard Speci?cation for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series1 This.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use f88 agencies of the Department of Defense.
The values stated in each system are not exact equivalents, therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the speci?
There are no ISO standards for surface discontinuities on any inch-series products.
Types of Surface Discontinuities see Terminology F for de? Shear bursts occur most frequently at the periphery of products having? Shear bursts may also occur on the sides of hex-head products.
ASTM-F/FM-, 0 –
Typical shear bursts are shown in Fig. Current edition approved Oct. Originally approved in For metric series products, D and Dc are in millimetres; for inch-series products, D and Dc are in inches.
NOTE 1—Forging cracks within the limits of this speci? Voids are t788 by marks or impressions of chips shear burrs or by rust formation on the raw material. They are not planished during forging. Typical voids are shown in Fig.
Typical tool marks are shown in Fig. NOTE 2—Bursts and shear bursts within the limits of this speci? Inspection and Evaluation 6.
Visual inspection can include the aatm of devices that provide up to, and including, power magni? Supplementary Requirements shall in no way negate any requirement of the speci?
After etch, the samples shall be examined under a 10 3 magni? The section shall be etched for microscopic examination in accordance with Test Method E Acceptance shall be based on the requirements of S1.
ASTM F788 – 13(2018)
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