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Datasheet. 91251A537 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
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
0.400in. and 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 chamfer
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.
0.375in.
A measurement from the bottom to the top of the head,in distinction from depth.
0.244in. and 0.250in. ⁓1/4"
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
hexagon
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"
The shortest straight line between flats,perpendicular to the height.
0.188in. ⁓13/64"
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
20
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
180000 pounds per square inch
A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.
39.0 rockwell c and 45.0 rockwell c
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.
verical knurls, color black
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel comp 1013 or steel comp 1015 or steel comp 1016 or steel comp 1017 or steel comp 1018 or steel comp 1019 or steel comp 1020 or steel comp 1021 or steel comp 1022 or steel comp 1023 or steel comp 1524 or steel comp 1025 or steel comp 1026 or steel comp 1527 or steel comp 1029 or steel comp 1030 or steel comp 1033 or steel comp 1034 or steel comp 1035 or steel comp 1536 or steel comp 1037 or steel comp 1038 or steel comp 1039 or steel comp 1040 or steel comp 1541
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
sae grade 8 assn std all material responses
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.
unc
Answers.
Unc
Steel comp 1013 or steel comp 1015 or steel comp 1016 or steel comp 1017 or steel comp 1018 or steel comp 1019 or steel comp 1020 or steel comp 1021 or steel comp 1022 or steel comp 1023 or steel comp 1524 or steel comp 1025 or steel comp 1026 or steel comp 1527 or steel comp 1029 or steel comp 1030 or steel comp 1033 or steel comp 1034 or steel comp 1035 or steel comp 1536 or steel comp 1037 or steel comp 1038 or steel comp 1039 or steel comp 1040 or steel comp 1541
20
Flat chamfer
0.400 inches minimum and 0.500 inches maximum
Right-hand
2a
Schedule B number: 7318152000
nmfc 093486
Bolts and bolts and their nuts or washers exported in the same shipment
FSC 5305 ⁓ Screws
NSN 5305-01-251-3445 SCREW,CAP,SOCKET HEAD
unc thread series oxide surface treated verical knurls, color black 20 thread quantity per inch flat chamfer head style 0.400" thread length right-hand 2a thread class
- NIIN
- 012513445
- NIIN Date
- 03/18/87
- Schedule B
- 7318152000
- Name Code
- 16282
- FIIG
- A003B0
- Item Weight
- 0.100lbs
- Item Dimensions
- --
- QUP
- Historical Price
- $0.50 EA
- DEMIL / ITAR
- Uncontrolled item (Code A)
- Hazmat
- No hazard information available from HMIRS.
- MSDS
- N/A
- Precious Metals
- No precious metals
- Enviromental
- N/A
- Electrostatic ESD & EMI
- No ESD or EMI sensitivity
Other Part Numbers Parts with same form, fit, and function by other manufacturers
Major End Users Countries and entities
- - Department of The Navy
- - Department of The Air Force
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- Special Handling
- Other or no special handling required (sh)
- LTL (less than a truck load rating)
- Rating variable
- 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)
- 093486 BOLTS,NUTS OR SCREWS, NOI (SUB 3)
- UFC (universal freight code)
- 48950
Similar by Design Other screws with similar characteristics
Nothing similar to this part number was found in our inventory
91251A537 / 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.
