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Datasheet. 537742-1 specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
2a
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
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.
2.8125in. ⁓2-53/64"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
hexagon
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 number of threads on the item per linear inch measured on a line parallel to the thread axis.
18
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
screw
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
unc
Answers.
Unc
18
Hexagon
Right-hand
2a
FSC 5305 ⁓ Screws
NSN 5305-01-623-4244 SCREW,CAP,HEXAGON HEAD
unc thread series screw 18 thread quantity per inch hexagon head style right-hand 2a thread class
- NIIN
- 016234244
- NIIN Date
- 11/14/13
- Schedule B
- Name Code
- 18257
- 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
- - Spain
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537742-1 / Screw,cap,hexagon headWhat is the formal definition of this item?
An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. the threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. the thread length being the controlled dimension, the grip length is not specified. a locking feature may be incorporated in the design of the head or threads. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. excludes bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.
