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Datasheet. NAS1271H4 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.
0.485in. ⁓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.
0.720in. and 0.750in. ⁓3/4"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
double hexagon extended washer
A measurement from the bottom to the top of the head,in distinction from depth.
0.290in. and 0.310in. ⁓5/16"
0.306in. and 0.315in.
0.428in. and 0.438in.
0.059in. and 0.079in.
The length of a straight line which passes through the center of a hole,and terminates at the circumference.
0.032in. and 0.042in. ⁓3/64"
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 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.
0.240in. and 0.260in.
The number of holes provided.
4
Indicates the type of hole(s) provided in the item.
drilled
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
28
The style designation that most nearly corresponds to the appearance of the hole configuration.
double hexagon longitudinal hole
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.
nas 621, 6AL-4V assn std single material 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.
unf
The document designator of the specification or standard which established the item of supply.
80205-NAS1271 professional/industrial association standard
Answers.
Unf
Titanium alloy
28
0.240 inches minimum and 0.260 inches maximum
0.032 inches minimum and 0.042 inches maximum
Double hexagon extended washer
0.485 inches
Right-hand
3a
Schedule B number: 8109900000
Zirconium and articles thereof nesoi
FSC 5306 ⁓ Bolts
NSN 5306-01-187-9053 BOLT,SHEAR
unf thread series 28 thread quantity per inch 0.240" grip length 0.032" hole diameter double hexagon extended washer head style 0.485" thread length right-hand 3a thread class
- NIIN
- 011879053
- NIIN Date
- 08/27/84
- Schedule B
- 8109900000
- Name Code
- 15903
- FIIG
- A003B0
- DEMIL / ITAR
- Uncontrolled item (Code A)
- Hazmat
- No hazard information available from HMIRS.
- MSDS
- N/A
- Precious Metals
- --
- Enviromental
- N/A
- Electrostatic ESD & EMI
- No ESD or EMI sensitivity
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NAS1271H4 / Bolt,shearWhat is the formal definition of this item?
A high strength, 160,000 pounds per square inch (1100 megapascals) minimum tensile strength externally threaded fastener designed for use in applications involving great shear stress. the head is designed to accommodate an external wrench or driver. 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. the unthreaded portion is of specific 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. a locking feature may be incorporated in the design of the head or threads. see bolt, machine and bolt, clevis.
