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Datasheet. 20-057-4-21 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
The national stock number or the identification information of the end equipment for which the item is a part.
bell helicopter models 212, 412, UH-1N, 222 and XV-15
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"
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
bolt
Answers.
Right-hand
3a
FSC 5306 ⁓ Bolts
NSN 5306-01-467-3815 BOLT,SHEAR
Used on bell helicopter models 212, 412, uh-1n, 222 and xv-15. bolt right-hand 3a thread class
- NIIN
- 014673815
- NIIN Date
- 08/26/99
- Schedule B
- Name Code
- 15903
- 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
Major End Users Countries and entities
- - Slovenia
- - Poland
- - Spain
- - Italy
- - Norway
- - Turkey
- - Nato Maintenance And Supply Agency
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20-057-4-21 / 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.
