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Datasheet. NAS4705D21 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.
0.437in. ⁓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.
1.735in. and 1.765in. ⁓1-49/64"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
flat countersunk
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.
0.510in. and 0.564in.
The length of a straight line which passes through the center of the grip,and terminates at the circumference.
0.3735in. and 0.3745in.
The length of a straight line which passes through the center of the shank unthreaded hole,and terminates at the inside circumference.
0.070in. first hole and 0.080in. first hole
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
TRI-Wing recess
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.312in. ⁓5/16"
A measurement of the longest dimension of the grip,in distinction from width.
1.302in. and 1.322in.
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
24
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
160000 pounds per square inch
A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.
36.0 rockwell c and 40.0 rockwell c
The included angle of the countersink.
99.0 degrees and 101.0 degrees
The distance from the shank hole centerline to the largest bearing surface of the head.
1.573in. first hole and 1.593in. first hole
Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
32.0 microinches bearing surface of head
Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
32.0 microinches grip
Designates the specific surface roughness rating,representing the arithmetic average deviation of the surface from the meanline in profile.
32.0 microinches threads
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel comp E4340 or steel comp 8740
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
MIL-S-5000 mil spec 1st material response or MIL-S-6049 mil spec 2nd material response or ams 6322 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.
cadmium and chromate
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.
QQ-P-416, TY2, CL2 fed 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
The document designator of the specification or standard which established the item of supply.
80205-NAS4705 professional/industrial association standard
Answers.
Unjf
Steel comp e4340 or steel comp 8740
24
1.302 inches minimum and 1.322 inches maximum
Flat countersunk
0.437 inches
Right-hand
3a
Schedule B number: 7318152000
Bolts and bolts and their nuts or washers exported in the same shipment
FSC 5305 ⁓ Screws
NSN 5305-01-456-0785 SCREW,CLOSE TOLERANCE
unjf thread series cadmium surface treated 24 thread quantity per inch 1.302" grip length flat countersunk head style 0.437" thread length right-hand 3a thread class
- NIIN
- 014560785
- NIIN Date
- 05/29/98
- Schedule B
- 7318152000
- Name Code
- 29294
- FIIG
- A003B0
- QUP
- Historical Price
- $2.18 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
Major End Users Countries and entities
- - Department of The Air Force
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NAS4705D21 / Screw,close toleranceWhat is the formal definition of this item?
A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. the nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (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 designed to be held or driven with an inserted driver. it is not designed for rotation by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads.
