Model: 20X1253

Ribbed Shoulder Bolt

Properties:

Thread Direction

Right-hand

Thread Length

0.906 inches

Fastener Length

3.375 inches

Head Style

Flat chamfer

Head Diameter

1.375 inches

Head Height

Between 0.312 inches and 0.402 inches

Shoulder Diameter

0.798 inches first shoulder and 0.808 inches first shoulder

Shoulder Length

0.312 inches first shoulder and 1.688 inches first shoulder

Rib Major Diameter

Between 0.810 inches and 0.820 inches

Rib Length

0.500 inches

Distance From Largest Diameter Of Bearing Surface Of Head To Ribs

0.562 inches

Thread Diameter

0.750 inches

Nonstandard Thread Pitch Diameter

+0.7044/+0.7084 inches

Thready Qty Per Inch (tpi)

Shoulder Shape

Round first shoulder

Material

Steel

Material Specification

T and a div b14 grade 8 78500 mfr ref single material response

Thread Series Designator

Unf

NSN

5306-00-448-3997

Part Number

20X1253

Description

Bolt,ribbed Shoulder

CAGE

78500

An externally threaded fastener whose threaded portion is of one nominal diameter. It has a series of longitudinal ribs, splines or serrations on all or a part of the shoulder. The minor diameter of the ribs must be greater than the major diameter of the threads. See also bolt, ribbed neck.

Part 20X1253 NSN 5306-00-448-3997

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

16014

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:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

0.6000lbs

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

573

TCC:

SHC:

ACC:

Construction Materials

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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