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Datasheet. 21601-A specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
2a
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.
0.500in. ⁓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.
0.500in. ⁓1/2"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
round
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.
0.187in. ⁓3/16"
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
slot
The national stock number or the identification information of the end equipment for which the item is a part.
4320-01-088-9369; pump rotary used on cummins, model VT-903M diesel engines onboard 41 ft coast guard vessels
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 number of threads on the item per linear inch measured on a line parallel to the thread axis.
20
The chemical compound or mechanical mixture properties of which the screw is fabricated.
copper alloy
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.
1EA
Unc
20
Round
0.500 inches
Right-hand
2a
Schedule B number: 7415338550
Other copper screws (not for wood) bolts and nuts
FSC 5305 ⁓ Screws
NSN 5305-01-067-8489 SCREW,MACHINE
Used on 4320-01-088-9369; pump rotary cummins,model vt-903m diesel engines onboard 41 ft coast guard vessels. unc thread series 20 thread quantity per inch round head style 0.500" thread length right-hand 2a thread class
- NIIN
- 010678489
- NIIN Date
- 11/09/78
- Schedule B
- 7415338550
- Name Code
- 06657
- FIIG
- A500D0
- QUP
- 1
- Historical Price
- $3.85 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
Other Part Numbers Parts with same form, fit, and function by other manufacturers
Major End Users Countries and entities
- - U.s. Coast Guard
- - Malaysia
- - Republic of Korea
- - Portugal
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21601-A / 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.
