Model: A51M42521-11

Shoulder Screw

Special Features:

Shoulder is internally relieved through head, 0.198 in. Min, 0.204 in. Max diameter by 1.687 in. Nom depth

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.312 inches

Fastener Length

Between 2.106 inches and 2.216 inches

Head Style

Flat chamfer

Head Diameter

0.750 inches

Head Height

0.094 inches

Shoulder Diameter

0.406 inches first shoulder and 0.407 inches first shoulder

Shoulder Length

1.794 inches first shoulder and 1.804 inches first shoulder

Shank Unthreaded Hole Diameter

0.072 inches first hole and 0.077 inches first hole

Internal Drive Style

Slot

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Hardness Rating

46.0 rockwell c and 49.0 rockwell c

Distance From Head Largest Bearing Surface To Shank Hole Center

2.006 inches first hole and 2.016 inches first hole

Shoulder Shape

Round first shoulder

Part Name Assigned By Controlling Agency

Navy special project

Material

Steel

Material Specification

-1010 fscm 26512 mfr ref single material response

Surface Treatment

Nickel

Surface Treatment Specification

Qq-n-290 cl 2 federal specification single treatment response

Test Data Document

81349-mil-i-6868 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

Unjf

NSN

5305-00-005-0065

Part Number

A51M42521-11

Description

Screw,shoulder

CAGE

61174

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 A51M42521-11 NSN 5305-00-005-0065

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:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

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:

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