Model: SM-B-20866

Thumbscrew

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.469 inches and 0.500 inches

Fastener Length

Between 2.281 inches and 2.312 inches

Head Style

Thumb no. 4

Head Height

0.875 inches

Width Between Flats

1.062 inches

Point Length

0.125 inches

First Diameter From Head

Between 0.170 inches and 0.180 inches

Distance From Largest Bearing Surface Of Head To End Of First Diameter

1.812 inches

Point Style

Cone

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Externally Relieved Body Diameter Quantity

Point Chamfer Angle

90.0 degrees

Material

Steel comp 304

Material Specification

Qq-s-763 cond a federal specification single material response

Surface Treatment

Passivate

Surface Treatment Specification

Qq-p-35 type 1 federal specification single treatment response

Thread Series Designator

Unc

NSN

5305-01-080-0676

Part Number

SM-B-20866

Description

Thumbscrew

CAGE

29381

An externally threaded fastener whose threaded portion is of one nominal diameter. It may have an unthreaded portion with a diameter less than, equal to, or greater than the diameter of the threaded portion. It has either a vertically flattened, circular knurled, or wing type head, all of which are designed for rotation by the thumb and fingers. For items having wrenching facilities such as socket recess, multiple spline or slot heads, use screw (as modified) or bolt (as modified).

Part SM-B-20866 NSN 5305-01-080-0676

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

06673

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:

0.1000lbs

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