AA991B

AA991B Thumbscrew

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Datasheet. AA991B specification

Thread Class
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.

2a

Thread Direction
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

Thread Length
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.

0.688in. ⁓45/64"

Fastener Length
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.

1.125in. ⁓1-1/8"

Head Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.

knurled no. 1

Head Diameter
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.

0.625in.

Head Height
A measurement from the bottom to the top of the head,in distinction from depth.

0.188in. ⁓13/64"

Point Length
A measurement of the longest dimension of the point,in distinction from width.

0.438in.

Point Diameter
The length of a straight line which passes through the center of a circular point,and terminates at the circumference.

0.180in.

Point Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the point.

chamfer dog

Nominal Thread Diameter
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"

Thread Quantity Per Inch
The number of threads on the item per linear inch measured on a line parallel to the thread axis.

28

Point Chamfer Angle

14.0 degrees

Material
The chemical compound or mechanical mixture properties of which the item is fabricated.

copper alloy

Surface Treatment
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.

cadmium

Thread Series Designator
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

Answers.

What class is the thread series?

Unf

What material is the thumbscrew made of ?

Copper alloy

What is the thread quantity per inch?

28

What is the head style?

Knurled no. 1

What is the thread length?

0.688 inches minimum

What is the thread direction?

Right-hand

What is the thread class?

2a

What is the NSN for AA991B?

5305-00-763-3236

How is this classified for shipping?

Schedule B number: 7415338550
Other copper screws (not for wood) bolts and nuts

What's the federal classification of AA991B?

FSC 5305 ⁓ Screws

NSN 5305-00-763-3236 THUMBSCREW

unf thread series cadmium surface treated 28 thread quantity per inch knurled no. 1 head style 0.688" thread length right-hand 2a thread class

NIIN
007633236
NIIN Date
01/01/60
Schedule B
7415338550 
Name Code
06673
FIIG
A003B0
DEMIL / ITAR
Uncontrolled item (Code A)
Hazmat
No hazard information available from HMIRS.
MSDS
N/A
Precious Metals
Metal content unknown
Enviromental
N/A
Electrostatic ESD & EMI
No ESD or EMI sensitivity

Major End Users Countries and entities

  • - Italy 

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Similar by Design Other thumbscrews with similar characteristics

Nothing similar to this part number was found in our inventory

AA991B / ThumbscrewWhat is the formal definition of this item?

An externally threaded fastener whose threaded portion is of one nominal diameter. it may have an unthreaded portion with a diameter less than, equal to, or greater than the diameter of the threaded portion. it has either a vertically flattened, circular knurled, or wing type head, all of which are designed for rotation by the thumb and fingers. for items having wrenching facilities such as socket recess, multiple spline or slot heads, use screw (as modified) or bolt (as modified).