FF-S-85D
4.4.9.4 Bursts. Bursts in the flats of hexagon head screws are permissible
discontinuities providing that no burst has a width or an open depth greater than
0.010 inch plus 0.025D, where D is the nominal screw size in inches. No burst
shall extend into the bearing surface.
4.4.10 Self-locking. Self-locking screws having non-metallic elements shall be
tested in accordance with MIL-DTL-18240.
4.4.11 Mercurous nitrate (stress relief) test. The contractor shall furnish
the government certification that cold worked naval brass screws have been
subjected to the stress relief treatment specified in 3.1.5.1. When specified
(see 6.2), samples taken as specified in 4.2.6 shall be subjected to a mercurous
nitrate test conducted in accordance with ASTM B154. There shall be no evidence
of cracks.
4.4.12 Proof load. Proof load test for cap screws shall be conducted in
accordance with ASTM F606.
4.4.13 Yield strength. Yield strength test for cap screws shall be conducted
in accordance with ASTM F606.
5.
PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be
as specified in the contract or order (see 6.2). When packaging of materiel is to
be performed by DoD or in-house contractor personnel, these personnel need to
contact the responsible packaging activity to ascertain packaging requirements.
Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service or Defense Agency, or within the military
service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files,
CD-ROM products, or by contacting the responsible packaging activity.
6.
NOTES
6.1 Intended use. Hexagon head and slotted head cap screws are designed
primarily for use in precision machine tools and similar applications. They are
commonly used in tapped holes, but may be used with nuts.
6.2 Ordering data. Purchasers should select the preferred options permitted
herein and include the following information in procurement documents:
(a)
Title, number, and date of this specification.
(b)
Type and style, grade (for carbon and alloy steel), and size or standard
part number (1.2).
(c)
Material and condition (3.1).
(d)
Mechanical properties, if other than those specified in Tables I
and IA (3.2).
(e)
Length, thread series, class, and hand (3.3).
(f)
Coating, if required, and whether thread shall conform to
different size requirements (3.3.3 and 3.4).
(g)
Decarburization test, if required (3.5.1).
(h)
Copper alloy grain size, if required (3.5.2).
(i)
Surface roughness, if different (3.6).
(j)
Method of manufacture, if necessary (3.7)
(k)
Material certification, if applicable (4.2.4).
(l)
Hardness and tensile tests (4.4.2 and 4.4.3).
(m)
Metallographic tests, if required (4.4.4).
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