Model: B3522-20

Internally Relieved Body Bolt

Special Features:

Concentric hole thread is left hand

Properties:

Threads Per Inch

28 concentric hole

Thread Class

Thread Direction

Left-hand

Thread Length

Between 1.058 inches and 1.068 inches

Fastener Length

1.375 inches

Head Style

Hexagon

Head Height

0.188 inches

Width Between Flats

2.000 inches

Shoulder Diameter

Between 1.240 inches and 1.250 inches

Shoulder Length

Between 0.062 inches and 0.067 inches

Concentric Hole Depth

Between 1.250 inches and 1.375 inches

Concentric Hole Diameter

0.250 inches

Thread Diameter

0.750 inches

Thread Series

Unf concentric hole

Thready Qty Per Inch (tpi)

Hardness Rating

32.0 rockwell c and 35.0 rockwell c

Thread Size

0.250 inches concentric hole

Material

Steel comp 1144 or steel comp 4140

Material Specification

Sae assn standard 1st material response or 66 federal standard 2nd material response

Style Designator

Concentric hole threaded

Thread Series Designator

Unc

NSN

5306-00-935-7558

Part Number

B3522-20

Description

Bolt,internally Relieved Body

CAGE

16128

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.

Part B3522-20 NSN 5306-00-935-7558

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

06676

FIIG:

A003B0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

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Schedule B and Export

Schedule B: 7318152000
SITC: 69421
End Use: Iron and steel products, other
NAICS: 332722
USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment