Model: 991-3521

Socket Head Cap Screw

Properties:

Thread Class

Thread Direction

Right-hand

Fastener Length

25.0 millimeters

Head Style

Flat fillister

Head Diameter

19.0 millimeters

Head Height

12.7 millimeters

Internal Drive Style

Hexagon

Thread Diameter

0.500 inches

Width Across Flats

9.52 millimeters

Thready Qty Per Inch (tpi)

Material

Steel property class 12.9

Thread Series Designator

Unc

NSN

5305-01-295-6204

Part Number

991-3521

Description

Screw,cap,socket Head

CAGE

34914

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See bolt, internal wrenching. Excludes screw, shoulder; and screw, machine.

Part 991-3521 NSN 5305-01-295-6204

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

16282

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