Model: 12705-20C39C

Shoulder Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 1.230 inches and 1.250 inches

Fastener Length

Between 3.665 inches and 3.691 inches

Head Style

Flat chamfer

Head Diameter

Between 1.723 inches and 1.750 inches

Head Height

Between 0.741 inches and 0.750 inches

Shoulder Diameter

1.247 inches first shoulder and 1.248 inches first shoulder

Shoulder Length

2.435 inches first shoulder and 2.441 inches first shoulder

Internal Drive Style

Hexagon

Thread Diameter

0.875 inches

Width Across Flats

0.625 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

160000 pounds per square inch

Hardness Rating

36.0 rockwell c and 43.0 rockwell c

Shoulder Shape

Round first shoulder

Material

Steel

Surface Treatment

Cadmium

Special Test Features

Special quality control testing

Surface Treatment Specification

Qq-p-416, type 1, cl 3 federal specification single treatment response

Test Data Document

81349-mil-p-23199 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).

Thread Series Designator

Unc

Reference Number Differentiating Characteristics

Material must conformships parts control center special quality control provisions

NSN

5305-00-225-2571

Part Number

12705-20C39C

Description

Screw,shoulder

CAGE

80539

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below no. 10 (0.190 in.) (5 mm) nominal diameter. No. 10 (0.190 in.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use screw, externally relieved body. For items with a no. 10 (0.190 in.) (5 mm) or larger thread diameter without an inserted driver head, use bolt, shoulder. Excludes bolt, internal wrenching and screw, cap, socket head.

Part 12705-20C39C NSN 5305-00-225-2571

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

22846

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:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

713

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