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Datasheet. NAS1156-23 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.
0.291in. ⁓19/64"
The dimension,measured along a line parallel to the longitudinal axis,from the largest bearing surface of the fastener head to the extreme opposite end,or as specifically designated for other type fasteners.
1.814in. and 1.844in. ⁓1-27/32"
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.
0.752in. and 0.762in.
The length of a straight line which passes through the center of the grip,and terminates at the circumference.
0.3735in. and 0.3745in.
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
14000 pounds per square inch
The document designator of the specification or standard which established the item of supply.
80205-NAS1156 professional/industrial association standard
Answers.
0.291 inches
3a
FSC 5305 ⁓ Screws
NSN 5305-01-021-2315 SCREW,CLOSE TOLERANCE
0.291" thread length 3a thread class
- NIIN
- 010212315
- NIIN Date
- 05/10/76
- 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
- Metal content unknown
- Enviromental
- N/A
- Electrostatic ESD & EMI
- No ESD or EMI sensitivity
Major End Users Countries and entities
- - Turkey
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NAS1156-23 / 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.
