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Datasheet. ST3M557-7-27 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.
0.656in. ⁓21/32"
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.
2.3435in. ⁓2-11/32"
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.
0.612in. and 0.672in.
The length of a straight line which passes through the center of the grip,and terminates at the circumference.
0.4365in. and 0.4370in.
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
HIGH-Torque
The national stock number or the identification information of the end equipment for which the item is a part.
F-15Sa
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.4375in. ⁓29/64"
A measurement of the longest dimension of the grip,in distinction from width.
1.6875in.
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
20
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.
125000 pounds per square inch
The included angle of the countersink.
99.0 degrees and 101.0 degrees
The chemical compound or mechanical mixture properties of which the item is fabricated.
nickel alloy 718
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.
passivate
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
Nickel alloy 718
20
1.6875 inches
Flat countersunk
0.656 inches
Right-hand
3a
Schedule B number: 7508900000
Other articles of nickel (excluding cloth, grill & netting of nickel wire)
FSC 5305 ⁓ Screws
NSN 5305-01-626-0694 SCREW,CLOSE TOLERANCE
Used on F-15SA. unjf thread series passivate surface treated 20 thread quantity per inch 1.6875" grip length flat countersunk head style 0.656" thread length right-hand 3a thread class
- NIIN
- 016260694
- NIIN Date
- 02/25/14
- Schedule B
- 7508900000
- Name Code
- 29294
- FIIG
- A003B0
- DEMIL / ITAR
- Uncontrolled item (Code )
- Hazmat
- No hazard information available from HMIRS.
- MSDS
- N/A
- 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. | HT4027-7-27 | Cage 06725 |
| 2. | 11923-7-27 | Cage 59563 |
| 3. | WC4027-7-27 | Cage 60516 |
Major End Users Countries and entities
- - Department of The Air Force
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ST3M557-7-27 / 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.
