2.3.2
Screw Fasteners
Screw fasteners shall be either zinc-plated or cadmium-plated steel,
minimum size 6 mm 1/4 inch - 20 with pan or flat Phillips heads. Fasteners
shall be heat treated and hardened with minimum tensile strength of 930 MPa
135,000 psi.
2.4
DOOR ASSEMBLIES
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NOTE: Do not accept doors that deviate from this
specification without consulting NAVFAC 15C.
Probable deviations include: magnetic and
electromagnetic doors, other non-finger stock type
doors, adhesive mounted finger stock, and requests
to approve doors tested to less than 10,000 open
close cycles, among others.
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The enclosure door shall be nonsagging and nonwarping and shall afford
shielded effectiveness equal to the rest of the enclosure when the door is
closed. The shielded door shall be provided with [multiple rows] [at least
one row] of RF finger stock around the door or its frame. The fingers that
form a contact between the door and its frame shall be protected from
damage due to physical contact and shall be concealed within the door and
frame assemblies. The door shall have a clear opening of [900 mm] [36
inches] [_____] wide and [2100 mm] [84 inch] [_____] high. Door assembly
shall be the same manufacture as the enclosure. Doors shall be reinforced
steel or laminated type. Laminated type shall be the same construction as
enclosure panels, except the steel faces shall be electrically and
mechanically joined by channels or overlapping seams, both of which shall
be continuously seam welded along all joined surfaces.
2.4.1
Finger Stock
Contacts for doors shall be copper beryllium conforming to ASTM B 194,
Condition HT. The finger stock shall be secured to the door or frame
without using special tools or soldering or adhesives and shall have a
minimum overlap of 50 mm 2 inches.
2.4.2
[Latching Type
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NOTE: Select the applicable paragraph(s) from the
following:
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NOTE: Specially designed door for electrical or
pneumatic operation may be specified; however, these
special doors are not compatible with all
demountable enclosures.
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The door shall be lever controlled with roller cam action requiring not
more than 90 N 20 pounds of operating force on the handle for both opening
and closing. The door shall be equipped with a two or three-point latching
mechanism that provides proper compressive force for the RF seal. The
mechanism shall be operable from both sides of the door and shall have
SECTION 13093N
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