Model: 21-421

Spring Tension Washer

Special Features:

Six equally spaced tabs 0.062 in. Wide with 0.031 in. Slot 0.016 in. From outside diameter to center hole

Properties:

Hole Diameter
Between 0.126 inches and 0.128 inches
Outside Diameter
Between 0.249 inches and 0.251 inches
Overall Height
0.039 inches
Material Thickness
Between 0.010 inches and 0.012 inches
Material
Copper alloy 510
Material Specification
Ams 4510 assn standard single material response
Surface Treatment
Nickel
Surface Treatment Specification
Qq-n-290 cl 1 type 4 federal specification single treatment response
Style Designator
Spring tension
NSN
5310-00-033-3101
Part Number
21-421
Description
Washer,spring Tension
CAGE
35918

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

Part 21-421 NSN 5310-00-033-3101

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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
194160
UFC:
55210
LTL:
50.0
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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