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MS/NAS Style - 303 CRES Keylocking Threaded Inserts
Lightweight - Metric

Material: Insert - 303 CRES
  Keys- 302 CRES
Finish: Passivated
Tolerances: ±.25 mm unless specified otherwise
Internal Threads: Per Fed Std. H28/21, MJ Form
Dimensions: All dimensions below are in millimeters
Keys: Inserts with an internal thread size of M6 and smaller are furnished with 2 locking keys. Larger sizes have 4 locking keys.
Material Identification Mark: None
Lubrication: Dry Film Lube on Self-Locking Inserts only
Performance: There is no National Aerospace Standard for Metric Keylocking Inserts manufactured from 303 CRES. The inserts are compliant with the other requirements of NA0147, NA1049, and NA0151 except for any references to the type of matrial or performance related to the material.
 

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Insert Installation/
Removal
Non-Locking Self-Locking Dimensions
ACME Part Number Internal
Thread*
Class 4H5H
External
Thread
Class 4h
H
Length
J
±.76
K
C'Bore
Depth
Install Tool
Part No.
217-076351 217-077351 M5x0.8 M8x1.25 8.0 3.73 1.27 217-072651
217-076551 217-077551 M5x0.5
217-076352 217-077352 M6x1.0 M10x1.25 10.0 6.02 1.78 217-072652
217-076552 217-077552 M6x0.75
217-076353 217-077353 M8x1.25 M12x1.25 12.0 6.28 1.78 217-072653
217-076553 217-077553 M8x1.0
217-076355 217-077355 M10x1.5 M14x1.5 14.0 6.46 2.29 217-072655
217-076555 217-077555 M10x1.25
217-076356 217-077356 M12x1.75 M16x1.5 16.0 6.46 2.29 217-072656
217-076556 217-077556 M12x1.25
* Thread Class on M 5 Internal Thread is 4H6H
For inserts with the following options, add the letter code shown to the end of the Acme part number:
S — Silver Plate per AMS 2410
SN — Silver Plate Only, No Dry Film Lube (Self-Locking Inserts Only
DFL — Dry Film Lube (Non-Locking INserts Only)
K — Self Broaching Keys



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