B18.5

B185 Square Neck Bolt

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Datasheet. B18.5 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.

0.750in. ⁓3/4"

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.

3.500in. ⁓3-1/2"

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

round

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

0.563in. and 0.594in.

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

0.125in. and 0.145in. ⁓5/32"

Neck Length
A measurement of the longest dimension of the neck,in distinction from width.

0.125in. and 0.156in.

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.

20

Hardness Rating
A numeric value that reflects the hardness of an item when used in conjunction with a hardness rating scale.

95.0 rockwell b

Minimum Yield Strength
The stress at which a material exhibits a specified limiting deviation from the proportionality of stress or strain.

55000 pounds per square inch

Neck Width
A measurement taken at right angles to the length of the neck,in distinction from thickness.

0.245in. and 0.260in.

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

steel

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.

zinc

Surface Treatment Document And Classification
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.

astm B633 assn std single treatment response

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.

unc

Answers.

What class is the thread series?

Unc

What material is the square neck bolt made of ?

Steel

What is the thread quantity per inch?

20

What is the head style?

Round

What is the thread length?

0.750 inches minimum

What is the thread direction?

Right-hand

What is the thread class?

2a

What is the NSN for B18.5?

5306-00-044-5623

How is this classified for shipping?

Schedule B number: 7318152000
Bolts and bolts and their nuts or washers exported in the same shipment

What's the federal classification of B18.5?

FSC 5306 ⁓ Bolts

NSN 5306-00-044-5623 BOLT,SQUARE NECK

unc thread series zinc surface treated 20 thread quantity per inch round head style 0.750" thread length right-hand 2a thread class

NIIN
000445623
NIIN Date
01/01/61
Schedule B
7318152000 
Name Code
15939
FIIG
A003B0
QUP
 
Historical Price
$44.10 HD
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

1. ASME-B18.5 Cage 05047
2. FF-B-584 Cage 81348
3. FF-B-584 TY1CL1STAGR1 Cage 80244
4. MS35751-26 Cage 96906

Major End Users Countries and entities

  • - Department of The Army 
  • - National Aeronautics And Space Administration 
  • - National Aeronautics And Space Administration 
  • - National Aeronautics And Space Administration 
  • - Department of The Navy 
  • - U.s. Marine Corps 
  • - Department of The Air Force 
  • - U.s. Coast Guard 
  • - General Services Administration 
  • - Canada 
  • - Republic of Korea 
  • - Portugal 
  • - Greece 
  • - Turkey 

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Similar by Design Other bolts with similar characteristics

Nothing similar to this part number was found in our inventory

B18.5 / Bolt,square neckWhat is the formal definition of this item?

A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.