Part Number ASME-B18.2.1

Hexagon Head Cap Screw
Description

Coarse threads (unc), 20 threads per inch. Tempered, medium-carbon steel. Plated with a protective cadmium coating. For use in precision machine tools with tapped holes, this cap screw features a hexagonally shaped head and right-hand thread. May also be

Stock Availability  condition code chart

Part number asme-b18.2.1 is in stock in the following quantities and conditions.

  • NS: 1122
  • NE: 3664
  • AR: 1
  • SV: 1

Note: Availability of this item was last updated 11/11/2022 and may have changed since then. Request a quote for up to date pricing and availability.

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Part Number
DEMIL
Shelf Life
UOM
NIIN
Part:
asme-b18.2.1
Demil:
No
Shelf Life:
UOM:
NIIN:
000712237
NSN
National Stock Number:
5305-00-071-2237 5305000712237
TXT
Description:
Hexagon Head Cap Screw
INC
INC
Item Name Code:
18257
MRC:
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.AAJD
Thread Class:
2a
MRC:
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.AAJF
Thread Direction:
Right-hand
MRC:
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.AASA
Thread Length:
Between 0.750 inches and 0.938 inches
MRC:
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.AASB
Fastener Length:
2.000 inches
MRC:
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.AASK
Head Style:
Hexagon
MRC:
A measurement from the bottom to the top of the head,in distinction from depth.AASU
Head Height:
Between 0.150 inches and 0.163 inches
MRC:
None.AATB
Width Between Flats:
Between 0.428 inches and 0.438 inches
MRC:
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.AHYM
Thread Diameter:
0.250 inches
MRC:
The number of threads on the item per linear inch measured on a line parallel to the thread axis.CMLP
Thready Qty Per Inch (tpi):
20
MRC:
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.CQBC
Min. Tensile Strength (psi):
120000 pounds per square inch
MRC:
A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.CQFM
Hardness Rating:
23.0 rockwell c and 32.0 rockwell c
MRC:
The stress at which a material exhibits a specified limiting deviation from the proportionality of stress or strain.CQHQ
Minimum Yield Strength:
85000 pounds per square inch
MRC:
The chemical compound or mechanical mixture properties of which the item is fabricated.MATT
Material:
Steel
MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.MDCL
Material Specification:
Sae gr 5 assn standard single material response
MRC:
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.SFTT
Surface Treatment:
Cadmium and chromate
MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.STDC
Surface Treatment Specification:
Sae-ams-qq-p-416 assn standard single treatment response
MRC:
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.THSD
Thread Series Designator:
Unc

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