Model: SM-B-20866

Thumbscrew

Properties:

Thread Class
2a
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)
20
Externally Relieved Body Diameter Quantity
1
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:
SR
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
SX
CRITL:
X

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:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
E
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
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

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