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Datasheet. 421-SS-26 specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
1a
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.
0.250in. ⁓1/4"
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.
0.750in. ⁓3/4"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
knurled no. 4
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.
0.375in.
A measurement from the bottom to the top of the head,in distinction from depth.
0.438in. ⁓29/64"
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
slot
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.190in. (UTS #10)
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
24
The chemical compound or mechanical mixture properties of which the screw is fabricated.
steel corrosion resisting
The metallic,nonmetallic,and/or chemical properties with which the screw is plated,dipped and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.
oxide
A characteristic of light that can be specified in terms of luminance,dominant wavelength,and purity.
black
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
unc
Answers.
Unc
Oxide
24
Knurled no. 4
0.250 inches
Right-hand
1a
Schedule B number: 7318152000
Bolts and bolts and their nuts or washers exported in the same shipment
FSC 5305 ⁓ Screws
NSN 5305-01-518-1202 SCREW,MACHINE
unc thread series oxide screw surface treated 24 thread quantity per inch knurled no. 4 head style 0.250" thread length right-hand 1a thread class
- NIIN
- 015181202
- NIIN Date
- 03/02/04
- Schedule B
- 7318152000
- Name Code
- 06657
- FIIG
- A500D0
- 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
- - Australia
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421-SS-26 / Screw,machineWhat is the formal definition of this item?
An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). no. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. a locking feature may be incorporated in the design of the head or threads. excludes bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. see also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.
