AIA/NAS 1101-2002 pdf download SCREW, MACHINE-FIAT FILLISTER cmFT 1 OF 2 HEAD, FULL THREAD, OFFSET CRUCIFORM
CODE: First dash number designates diameter and thread.
Second dash number indicates length in .O625 increments (as converted to three decimal places per ANSI Y14.5).
Intermediate or longer lengths may be specified by use of whole dash numbers only.
Use of .25 inch increments is recommended for screws over 3 inches long.
“A” following last dash number designates aluminum coat per NAS4006.
“B” following last dash number designates dull black cadmium plate.
“C” following last dash number designates aluminum coat per MIL-C-83488, Type II, Class 3.
“I)” in lieu of second dash designates cross-drilled head.
“E” in lieu of first dash designates cres.
” H in lieu of second dash designates drilled head.
“P” following last dash number designates cadmium plate per QQ-P-416, Type II, Class 2.
“V” in lieu of first dash designates titanium alloy.
NOTES: (a) Diameter of unthreaded portion of screws shall not be less than minimum pitch diameternor more than maximum major diameter of thread.(b) For screws 2 inches long or shorter, complete threads shall extend to within 2 threads ofthe bearing surface of the head, Screws of longer length shall have a minimum completethread length of 1.750 inches.(c) Recess gaging in accordance with MS33781 or MS14191 as applicable(d) Screws shall be free from burrs and sharp edges.(e) Offset cruciform screws to be installed and removed with drivers per MS33781 or MS14191as applicable.(f) Bearing surface squareness: within .003 FIM of shank dia.(g) For cres, magnetic permeability shall be less than 2.0 (Air = 1.0) for field strengthH = 200 Oersteds. (Magnetic permeability indicator per ASTM A342.)(h) Tensile stress areas used for calculation of ultimate tensile strength values are based onFED-STD-H28.(k) For description of status notes, see NAS380.() Dimensions are in inches and apply after plating and coating.(m) Surface roughness: “D” dia. underside of head and sides and root of threads – 32 microinches,other surfaces – 125 microinches, per ANSI/ASME B46.1.(n)Threads in accordance with MIL-S-8879.(p) MS14191 recess is applicable to sizes 06 thru 5 inclusive, MS33781 recess is applicable toall sizes.(g) Type I plating (“W” code) is inactive for new design.() For the drilled head (H code), diameter K is .034 to .042. For the cross-drilled head(D code), diameter K is .022 to .030.(t) The effect of cold work and aging induced during the manufacturing cycle may increase theultimate tensile value of the finished part, but this shall not exceed 1.3 times the specifiedminimum tensile value.
AIA/NAS 1101-2002 pdf download
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