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Datasheet. 121 271 specification
Thread Direction
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.
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
Fastener Length
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.
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"
Head Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
flat fillister
Internal Drive Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
hexagon
End Item Identification
The national stock number or the identification information of the end equipment for which the item is a part.
The national stock number or the identification information of the end equipment for which the item is a part.
4940-01-601-1928
Nominal Thread Diameter
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.250in. ⁓1/4"
Thread Quantity Per Inch
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
20
Part Name Assigned By Controlling Agency
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
screw, .250-20 x .500 soc hd
Thread Series Designator
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
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.
What class is the thread series?
Unc
What is the thread quantity per inch?
20
What is the head style?
Flat fillister
What is the thread direction?
Right-hand
What's the federal classification of 121 271?
FSC 5305 ⁓ Screws
NSN 5305-01-625-8948 SCREW,CAP,SOCKET HEAD
Used on 4940-01-601-1928. unc thread series screw, .250-20 x .500 soc hd 20 thread quantity per inch flat fillister head style right-hand
- NIIN
- 016258948
- NIIN Date
- 02/19/14
- Schedule B
- 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 Army
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- Special Handling
- Other or no special handling required (sh)
- LTL (less than a truck load rating)
- 70.0
- LCL (less than a car load rating)
- Unknown
- Special Cargo
- No special type of cargo code applicable
- Air Freight (Minimum cargo door size required)
- Shipment is not a consolidation and does not exceed 84 inches in any dimension.
- Customs Requirement Classification
- Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater
- Commodity (for shipments via water)
- Metal hardware
- NMFC (national motor freight code)
- 096640 SCREWS, IRON OR STEEL
- UFC (universal freight code)
- 50600
Similar by Design Other screws with similar characteristics
Nothing similar to this part number was found in our inventory
121 271 / 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.
