MIL-DTL-917F(SH)
3.16.7 Rounded corners and edges. Projections and overhanging edges which may cause personal injury or
catch upon clothing shall be avoided. Unless otherwise specified (see 6.2), edges and corners of external surfaces
shall be rounded to a minimum radius of 0.04 inch [1 millimeter (mm)], and exposed corners to a minimum of
0.5 inch (13 mm), if practical.
3.16.8 Countersinking. Drilled and tapped holes shall not be countersunk, except as specified in 3.2.24.9.3 and
the individual equipment specification (see 6.2).
3.16.9 Marking for rotation. Rotating parts shall be marked in a permanent manner to show the direction of
rotation where applicable to the specific function of the equipment.
3.16.10 Lubrication design and lubricants. Guidance for the design for lubrication of equipment can be found
in MIL-HDBK-267. As few lubricants and as few tools and accessories as practicable shall be required. Points
requiring periodic lubrication shall be conveniently accessible. In this connection, consideration shall be given to
the probable installed location of the equipment. Guidance for lubricants, lubrication charts, and instruction plates
can be found in MIL-HDBK-267. Grease-lubricated ball bearings shall be lubricated by means of compression
grease cups and grease drain plugs. Unless otherwise specified in the applicable equipment specifications, grease
type lubricants for antifriction bearings shall be in accordance with DOD-G-24508. For general purpose and high
performance shipboard antifriction bearing applications, MIL-PRF-24139 shall be used for low hoist applications
with maximum bearing temperature below 230 °F (110 °C) and MIL-PRF-81322 for maximum bearing
temperatures between 230 °F (110 °C) and 347 °F (175 °C).
3.16.11 Electrical bonding. Protective finishes shall be omitted at those points where the presence would
prevent proper electrical bonding as required for shielding or connection. Provision shall be made to ensure
permanence of electrical contact between the surfaces of all parts in contact over long periods of time or in the
presence of humid saline atmospheres (see 3.14.2.2).
3.16.12 Test points. Test points shall be provided where practicable to simplify routine maintenance,
troubleshooting, and calibration of the equipment (for example, checking significant voltages, currents, and
waveforms and the insertion of test signals). The test points shall be capable of being utilized during normal
operation without affecting the equipment performance. When the maintenance or operation of equipment
employing potentials in excess of 2,000 V requires that these voltages be measured, the equipment shall be provided
with test points that permit all the high voltages to be measured at potential levels of less than 1,000 V relative to
ground. This shall be accomplished through the application of voltage dividers or other techniques such as the use
of safety type panel meters and multipliers. The voltages specified herein shall be interpreted as applying to DC,
AC, and DC plus AC voltages.
3.17 Plates for identification and information. Plates for identification and for information (including plates for
warning and caution) shall be designed and installed in accordance with MIL-DTL-15024, MIL-P-15024/5, and the
requirements herein.
3.17.1 Type of service. The requirements of MIL-P-15024/5 for plates for normal service shall apply, except
that for plates to be used in locations exposed to the weather, the requirements of MIL-P-15024/5 for severe service
shall apply.
3.17.2 Mounting of plates. Plates shall be mounted by means of screws in tapped holes, screws held by captive
nuts, screws held by nuts on the opposite side of the panel or chassis, or by self-tapping screws. Aluminum screws
shall not be used.
3.17.3 Color style of plastic plates. The color style of plastic plates shall be in accordance with Type II of
MIL-DTL-15024, except as otherwise specified herein or in the individual equipment specification.
3.17.4 Identification plates. Identification plates shall be in accordance with MIL-DTL-15024 and
MIL-STD-130 (see 6.2).
3.17.4.1 Warning and caution plates. Warning and caution plates shall be formatted in accordance with
ANSI/NEMA Z535.2 and ANSI/NEMA Z535.4.
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