Model: MILB857

Square Neck Bolt

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.844 inches

Fastener Length

1.000 inches

Head Style

Button

Head Diameter

Between 0.563 inches and 0.594 inches

Head Height

Between 0.125 inches and 0.145 inches

Neck Length

Between 0.125 inches and 0.156 inches

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

55000 pounds per square inch

Hardness Rating

95.0 rockwell b

Neck Width

Between 0.245 inches and 0.260 inches

Material

Steel

Material Specification

Ff-b-584 federal specification single material response

Surface Treatment

Zinc

Surface Treatment Specification

Qq-z-325, type 2, cl 3 federal specification single treatment response

Thread Series Designator

Unc

Nondefinitive Specification/std Data

1 type and a style and 1 class

NSN

5306-00-248-8684

Part Number

MILB857

Description

Bolt,square Neck

CAGE

81349

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

Part MILB857 NSN 5306-00-248-8684

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

15939

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