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Datasheet. ST3M731-4D27 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.
0.425in. ⁓7/16"
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.
2.098in. and 2.128in. ⁓2-9/64"
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.
0.125in. and 0.140in. ⁓9/64"
0.430in. and 0.439in.
The length of a straight line which passes through the center of the grip,and terminates at the circumference.
0.2485in. and 0.2495in.
The length of a straight line which passes through the center of the shank unthreaded hole,and terminates at the inside circumference.
0.076in. first hole and 0.086in. first hole
The national stock number or the identification information of the end equipment for which the item is a part.
af/A-18A and af/A-18B aircraft landing gear system
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"
A measurement of the longest dimension of the grip,in distinction from width.
1.678in. and 1.698in.
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.
28
The distance from the shank hole centerline to the largest bearing surface of the head.
1.932in. first hole
Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
16.0 microinches threads
Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
63.0 microinches bearing surface of head
Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
63.0 microinches grip
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
ivd coated titanium hexagon head bolt
The chemical compound or mechanical mixture properties of which the item is fabricated.
titanium alloy
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
AMS4697, comp 6AL-4V 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.
aluminum
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.
MIL-C-83488, ty 2, cl 3 mil 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.
unjf
Answers.
Unjf
Titanium alloy
28
1.678 inches minimum and 1.698 inches maximum
Hexagon
0.425 inches
Right-hand
3a
Schedule B number: 8109900000
Zirconium and articles thereof nesoi
FSC 5306 ⁓ Bolts
NSN 5306-01-478-4738 BOLT,CLOSE TOLERANCE
Used on af/a-18a and af/a-18b aircraft landing gear system. unjf thread series aluminum surface treated ivd coated titanium hexagon head bolt 28 thread quantity per inch 1.678" grip length hexagon head style 0.425" thread length right-hand 3a thread class
- NIIN
- 014784738
- NIIN Date
- 09/13/00
- Schedule B
- 8109900000
- Name Code
- 27851
- FIIG
- A003B0
- 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
| 1. | VS3207-4-27D | Cage 92215 |
Major End Users Countries and entities
- - Spain
- - Australia
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ST3M731-4D27 / Bolt,close toleranceWhat is the formal definition of this item?
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.
