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Datasheet. 1550121-1 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.
0.446in. ⁓29/64"
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.
0.607in. ⁓39/64"
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.
0.234in. and 0.266in. ⁓17/64"
0.615in. and 0.627in.
The length of a straight line which passes through the center of a hole,and terminates at the circumference.
0.070in. ⁓5/64"
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.438in. ⁓29/64"
A measurement of the longest dimension of the grip,in distinction from width.
0.161in.
The number of holes provided.
1
Indicates the type of hole(s) provided in the item.
drilled
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.
20
The style designation that most nearly corresponds to the appearance of the hole configuration.
hexagon flats
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
MIL-S-6049 mil spec single material response or MIL-S-6050 mil spec single material response or MIL-S-5676 mil spec single material response or ams 6300 assn std single material response
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.
cadmium
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.
QQ-P-416, ty 1, cl 3 fed spec single treatment response
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
20
0.161 inches
0.070 inches
Hexagon
0.446 inches minimum
Right-hand
3a
FSC 5306 ⁓ Bolts
NSN 5306-00-404-1846 BOLT,MACHINE
unf thread series cadmium surface treated 20 thread quantity per inch 0.161" grip length 0.070" hole diameter hexagon head style 0.446" thread length right-hand 3a thread class
- NIIN
- 004041846
- NIIN Date
- 08/08/69
- Schedule B
- Name Code
- 01847
- 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
- - Republic of Korea
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1550121-1 / Bolt,machineWhat is the formal definition of this item?
An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. the threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. for items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. see also screw, cap, hexagon head and screw, machine.
