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Datasheet. B3522-20 specification
The number of single screw threads per inch of the threaded portion.
28 concentric hole
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.
LEFT-Hand
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
1.058in. and 1.068in. ⁓1-5/64"
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.
1.375in. ⁓1-3/8"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
hexagon
A measurement from the bottom to the top of the head,in distinction from depth.
0.188in. ⁓13/64"
2.000in.
The length of a straight line which passes through the center of a shoulder,and terminates at the circumference.
1.240in. and 1.250in.
The length of the enlarged portion/s/ located on the shank of the item.
0.062in. and 0.067in.
1.250in. and 1.375in.
0.250in.
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.750in. ⁓3/4"
A designation indicating the diameter-pitch combination and the number of threads per measurement scale applied to a series of diameters.
unf concentric hole
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
10
A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.
32.0 rockwell c and 35.0 rockwell c
A designation that is used for the purpose of general identification of the thread.
0.250in. concentric hole ⁓1/4"
Those unusual or unique characteristics or qualities of an item not covered in the other requirements and which are determined to be essential for identification.
concentric hole thread is left hand
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel comp 1144 or steel comp 4140
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
sae assn std 1st material response or 66 fed std 2nd material response
The style designation indicating the configuration that most nearly corresponds to the appearance of the item.
concentric hole threaded
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
Concentric hole threaded
Steel comp 1144 or steel comp 4140
10
Hexagon
1.058 inches minimum and 1.068 inches maximum
Left-hand
3a
Schedule B number: 7318152000
Bolts and bolts and their nuts or washers exported in the same shipment
FSC 5306 ⁓ Bolts
NSN 5306-00-935-7558 BOLT,INTERNALLY RELIEVED BODY
unc thread series concentric hole threaded concentric hole thread is left hand 10 thread quantity per inch hexagon head style 1.058" thread length left-hand 3a thread class
- NIIN
- 009357558
- NIIN Date
- 05/31/68
- Schedule B
- 7318152000
- Name Code
- 06676
- 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
Other Part Numbers Parts with same form, fit, and function by other manufacturers
Major End Users Countries and entities
- - Germany
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B3522-20 / Bolt,internally relieved bodyWhat is the formal definition of this item?
An externally threaded fastener whose external threaded portion is of one nominal diameter. it has a concentric hole along the longitudinal centerline which may extend a part or the full length of the bolt. the concentric hole along the centerline may be counterbored and/or internally threaded at the head end or the bolt end. the head is designed to be held or driven by an external and/or internal driver. for items having a hole(s) perpendicular to the axis which meet the concentric hole along the longitudinal centerline, see bolt, fluid passage.
