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Datasheet. 640 specification
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.
1.000in. and 1.188in. ⁓1-13/64"
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.
3.000in. ⁓3-1/64"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
hexagon
A measurement from the bottom to the top of the head,in distinction from depth.
0.226in. and 0.243in. ⁓1/4"
0.551in. and 0.562in.
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.375in. ⁓3/8"
Those features,not otherwise specified,which may be required for proper functioning of the item.
finished head
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
16
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
154000 pounds per square inch
The stress at which a material exhibits a specified limiting deviation from the proportionality of stress or strain.
120000 pounds per square inch
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.
cold forged; protected by perma plate finish; double heat treated; 50 per pkg
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel comp 1541
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
The document designator of the specification or standard which established the item of supply.
80204-grade 6 professional/industrial association standard
Answers.
Unc
Steel comp 1541
16
Hexagon
1.000 inches minimum and 1.188 inches maximum
Right-hand
Schedule B number: 7318152000
Bolts and bolts and their nuts or washers exported in the same shipment
FSC 5305 ⁓ Screws
NSN 5305-01-075-1544 SCREW,CAP,HEXAGON HEAD
unc thread series cold forged; protected by perma plate finish; double heat treated; 50 per pkg 16 thread quantity per inch hexagon head style 1.000" thread length right-hand
- NIIN
- 010751544
- NIIN Date
- 04/14/79
- Schedule B
- 7318152000
- Name Code
- 18257
- 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
- - National Institutes of Health
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640 / 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.
