Close Tolerance Bolt

B6812

B6812
(NSN) National Stock Number
5306-00-151-0321
Federal Supply Classification
5306 Bolts
Item Name Code
27851
Schedule B Code
7318152000
Summary

3a thread class, right-hand thread direction, 3.390 inches minimum and 3.437 inches maximum fastener length, hexagon head style, 0.140 inches minimum and 0.172 inches maximum head height, 0.428 inches minimum and 0.440 inches maximum width between flats

DAC HCC DMIL RNCC
E - - 4
RNVC SADC MSDS RNAAC
1 - - XX
Identification

An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.

INC FIIG Concept Condition
27851 A003B0 - 1
Specifications
Thread Class
3a
Details A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
Thread Direction
right-hand
Details 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.
Fastener Length
3.390 inches minimum and 3.437 inches maximum
Details 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.
Head Style
hexagon
Details The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
Head Height
0.140 inches minimum and 0.172 inches maximum
Details A measurement from the bottom to the top of the head,in distinction from depth.
Width Between Flats
0.428 inches minimum and 0.440 inches maximum
Details None.
Hole Diameter
0.046 inches nominal
Details The length of a straight line which passes through the center of a hole,and terminates at the circumference.
Grip Diameter
0.2487 inches minimum and 0.2492 inches maximum
Details The length of a straight line which passes through the center of the grip,and terminates at the circumference.
Shank Unthreaded Hole Diameter
0.076 inches nominal first hole
Details The length of a straight line which passes through the center of the shank unthreaded hole,and terminates at the inside circumference.
Nominal Thread Diameter
0.250 inches
Details The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
Grip Length
3.234 inches minimum and 3.266 inches maximum
Details A measurement of the longest dimension of the grip,in distinction from width.
Hole Quantity
1
Details The number of holes provided.
Hole Type
drilled
Details Indicates the type of hole(s) provided in the item.
Thread Quantity Per Inch
28
Details The number of threads on the item per linear inch measured on a line parallel to the thread axis.
Minimum Tensile Strength
125000 pounds per square inch
Details The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
Hardness Rating
26.0 rockwell c minimum overall and 32.0 rockwell c maximum overall
Details A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.
Hole Configuration Style
hexagon flats
Details The style designation that most nearly corresponds to the appearance of the hole configuration.
Distance From Head Largest Bearing Surface To Shank Hole Center
3.234 inches minimum first hole and 3.266 inches maximum first hole
Details The distance from the shank hole centerline to the largest bearing surface of the head.
Surface Finish
63.0 microinches bearing surface of head
Details Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
Material
steel comp 81b45 overall or steel comp hnv-2 overall or steel comp 4037 overall or steel comp 4140 overall or steel comp 4130 overall
Details The chemical compound or mechanical mixture properties of which the item is fabricated.
Surface Treatment
cadmium overall and chromate overall
Details 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.
Surface Treatment Document And Classification
qq-p-416,type 2,class 3 fed spec single treatment response overall
Details The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.
Thread Series Designator
unf
Details A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
Master-Cross Reference List
Part CAGE DAC HCC RNCC RNVC MSDS RNAAC
AN174H33 88044 E - 2 2 - XX
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
HMIC PMIC ESD/EMI Criticality
N U - -
Freight
Universal / National Freight and Handling Information
UFC HMC LTL LCL
48950 - W -
RVC WCC TCC SHC
- 573 Z 9

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Manufacturer
AIR FORCE-NAVY AERONAUTICAL SPECIFICATIONS PROMULGATED BY AERONAUTICAL STANDARDS GROUP
CAGE: 81352
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FAQs
Frequently asked questions for NSN 5306-00-151-0321
What is the NIIN of the NSN 5306-00-151-0321?
The National Item Identification Number (NIIN) of the NSN 5306-00-151-0321 is 00-151-0321
When the NSN 5306-00-151-0321 was assigned to the Federal Catalog?
It was assigned 61 years ago, on Tue, Jan 1, 1963
Does the NSN 5306-00-151-0321 contain any precious metals?
Type/content is unknown
Does the NSN 5306-00-151-0321 contain any hazardous material?
No data in HMIRS

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