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Datasheet. NAS1143-7 specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
3a
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
0.276in. ⁓9/32"
The length of a straight line which passes through the center of the grip,and terminates at the circumference.
0.438in.
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.190in. (UTS #10)
A measurement of the longest dimension of the grip,in distinction from width.
0.714in.
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
32
Those unusual or unique characteristics or qualities of an item not covered in the other requirements and which are determined to be essential for identification.
MACHINE-Pan head modified, close tolerance, short thread, TORQ-Set, alloy steel, cadmium plated per QQ-P-416, type ii, class 2, 160, 000 to 180, 000 psi uts, shall be in accordance with all requirements as specified in national aerospace standard NAS1141 thru 1148
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
unjf
Answers.
Unjf
32
0.714 inches
0.276 inches
3a
FSC 5305 ⁓ Screws
NSN 5305-01-385-4390 SCREW,CLOSE TOLERANCE
unjf thread series machine-pan head modified, close tolerance, short thread, torq-set, alloy steel, cadmium plated per qq-p-416, type ii, class 2, 160, 000 to 180, 000 psi uts, shall be in accordance with all requirements as specified in national aerospace standard NAS1141 thru 1148 32 thread quantity per inch 0.714" grip length 0.276" thread length 3a thread class
- NIIN
- 013854390
- NIIN Date
- 01/12/94
- Schedule B
- Name Code
- 29294
- FIIG
- A003B0
- DEMIL / ITAR
- Uncontrolled item (Code A)
- Hazmat
- No hazard information available from HMIRS.
- MSDS
- N/A
- Precious Metals
- No precious metals
- Enviromental
- N/A
- Electrostatic ESD & EMI
- No ESD or EMI sensitivity
Major End Users Countries and entities
- - National Aeronautics And Space Administration
- - Turkey
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NAS1143-7 / Screw,close toleranceWhat is the formal definition of this item?
A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. the nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. the head is designed to be held or driven with an inserted driver. it is not designed for rotation by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads.
