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Datasheet. 91251A378 specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
3a
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.
RIGHT-Hand
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
0.500in. ⁓1/2"
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.
0.500in. ⁓1/2"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
flat fillister
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.
0.469in.
A measurement from the bottom to the top of the head,in distinction from depth.
0.312in. ⁓5/16"
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
hexagon
The national stock number or the identification information of the end equipment for which the item is a part.
F-15Sa
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.3125in. ⁓21/64"
The shortest straight line between flats,perpendicular to the height.
0.250in. ⁓1/4"
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
24
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
170000 pounds per square inch
A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.
37.0 rockwell c
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
alloy steel socket head cap screw
A characteristic of light that can be specified in terms of luminance,dominant wavelength,and purity.
black
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel comp 631
The metallic,nonmetallic,and/or chemical properties with which the item is plated,dipped,and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.
oxide
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
unf
Answers.
Unf
Steel comp 631
24
Flat fillister
0.500 inches
Right-hand
3a
Schedule B number: 7318152000
Bolts and bolts and their nuts or washers exported in the same shipment
FSC 5305 ⁓ Screws
NSN 5305-01-644-5162 SCREW,CAP,SOCKET HEAD
Used on F-15SA. unf thread series oxide surface treated alloy steel socket head cap screw 24 thread quantity per inch flat fillister head style 0.500" thread length right-hand 3a thread class
- NIIN
- 016445162
- NIIN Date
- 05/09/15
- Schedule B
- 7318152000
- Name Code
- 16282
- FIIG
- A003B0
- DEMIL / ITAR
- Uncontrolled item (Code )
- Hazmat
- No hazard information available from HMIRS.
- MSDS
- N/A
- Precious Metals
- --
- Enviromental
- N/A
- Electrostatic ESD & EMI
- No ESD or EMI sensitivity
Major End Users Countries and entities
- - Department of The Air Force
- - Canada
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91251A378 / Screw,cap,socket headWhat is the formal definition of this item?
An externally threaded fastener whose threaded portion is of one nominal diameter. the head has an internal socket or multiple spline for use with an inserted driver. a locking feature may be incorporated in the design of the head or threads. excludes items with bevel (conical) heads. see bolt, internal wrenching. excludes screw, shoulder; and screw, machine.
