Model: 556771

Helical Compression Spring Seat

Special Features:

0.156 in. Diameter through holes equally spaced in 1st en (4 holes) ; 0.130 in. Distance from hole ctr to end; not casehardened

Properties:

Overall Height
0.4000 inches
First Step Diameter
Between 0.3980 inches and 0.4040 inches
First Step Length
Between 0.0300 inches and 0.0600 inches
Second Step Diameter
Between 0.4900 inches and 0.4960 inches
Second Step Length
Between 0.0350 inches and 0.0450 inches
Bore Diameter
Between 0.2760 inches and 0.2860 inches
Material Hardness Rating
Between 75.0 rockwell superficial 15-n and 79.5 rockwell superficial 15-n
Second End Diameter
Between 0.3700 inches and 0.3800 inches
Design Type
Solid
End Diameter
Between 0.3700 inches and 0.3800 inches
Distance From End To First Step
Between 0.1930 inches and 0.2430 inches
Material
Steel, qq-s-763, class 416
Material
Steel comp 416
Material Specification
Qq-s-763, class 416 federal specification single material response
NSN
5340-00-987-5120
Part Number
556771
Description
Seat,helical Compression Spring
CAGE
73030

Part 556771 NSN 5340-00-987-5120

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
24328
FIIG:
T319-E
Concept No.:
App. Key:
EA
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:
P
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
133300
UFC:
63220
LTL:
RATING VARIABLE
LCL:
RATING VARIABLE
WCC:
713
TCC:
Z
SHC:
9
ACC:
Equipment for Aircraft

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