Model: MIL-B-857

Square Neck Bolt

Special Features:

W/1 sq nut

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

1.250 inches

Fastener Length

5.000 inches

Head Style

Button

Head Diameter

Between 1.063 inches and 1.094 inches

Head Height

Between 0.250 inches and 0.270 inches

Neck Length

Between 0.344 inches and 0.375 inches

Thread Diameter

0.500 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

55000 pounds per square inch

Neck Width

Between 0.492 inches and 0.515 inches

Material

Steel

Material Specification

Sae gr 1 assn standard single material response

Thread Series Designator

Unc

Nondefinitive Specification/std Data

5 type and 1 grade

Departure From Cited Designator

As modified by head diameter and bolt neck length and special features

NSN

5306-00-260-7413

Part Number

MIL-B-857

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 MIL-B-857 NSN 5306-00-260-7413

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