Model: ST4M178A4

Spring Tension Washer

Special Features:

One tab, 0.200 in. W, on each side of center hole

Properties:

Hole Diameter
2.400 inches
Outside Diameter
2.860 inches
Overall Height
0.307 inches
Material Thickness
0.025 inches
Material
Copper alloy 172
Material Specification
Qq-c-533, temper at federal specification single material response
Surface Treatment
Tin
Surface Treatment Specification
Mil-t-10727 military specification single treatment response
Style Designator
Spring tension
NSN
5310-01-030-4920
Part Number
ST4M178A4
Description
Washer,spring Tension
CAGE
76301

A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.

Part ST4M178A4 NSN 5310-01-030-4920

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
15938
FIIG:
A022B0
Concept No.:
1
App. Key:
A
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:
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:
194120
UFC:
95100
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7415210000
  • SITC: 69432
  • End Use: Finished metal shapes
  • NAICS: 332722
  • USDA: 1

Freight Class: Copper washers including spring washers not threaded

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