Model: FF-S-21

Setscrew

Properties:

Thread Class
3a
Thread Direction
Right-hand
Fastener Length
Between 1.438 inches and 1.500 inches
Head Style
Square
Head Height
Between 0.178 inches and 0.196 inches
Width Between Flats
Between 0.241 inches and 0.250 inches
Point Style
Cup
Internal Drive Style
W/o internal drive
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
20
Hardness Rating
45.0 rockwell c and 53.0 rockwell c
Hardness Rating
45.0 rockwell c and 53.0 rockwell c
Part Name Assigned By Controlling Agency
Setscrew
Material
Steel comp 4037 or steel comp 4137 or steel comp 4140 or steel comp 8630 or steel comp 8740
Material Specification
66 federal standard all material responses
Thread Series Designator
Unc
Nondefinitive Specification/std Data
A type
NSN
5305-00-249-0591
Part Number
FF-S-21
Description
Setscrew
CAGE
81348

An externally threaded device whose threaded portion is of one nominal diameter with or without a head and having a cup, cone, or other type of machined point designed to prevent or restrict relative movement of parts and designed to be driven with either a wrench or inserted driver. A locking feature may be incorporated in the design of the head or threads.

Part FF-S-21 NSN 5305-00-249-0591

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06672
FIIG:
A003B0
Concept No.:
App. Key:
SQ
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:
U
ESD:
ESD:
MMAC:
CRITL:
X

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:
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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