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MS/NAS Style - A286 CRES Keylocking Threaded Inserts
Lightweight - Inch

Material: Insert - A286 CRES (140 KSI Min)
  Keys- 302 CRES
Finish: Passivated
Tolerances: ±.010 inch unless specified otherwise
Internal Threads: Per SAE AS8879
Dimensions: All dimensions below are in inches
Keys: Inserts with an internal thread size of 5/16 and larger are furnished with 4 locking keys. Smaller sizes have 2 locking keys.
Material Identification Mark: One line on top of insert
Lubrication: Dry Film Lube on Self-Locking Inserts only
Performance: MIL-I-45914A (MS51830 & NAS1394)
 

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Insert Installation/
Removal
Non-Locking Self-Locking Dimensions
MS/NAS ACME Part Number MS/NAS ACME Part Number Internal
Thread
Class 3B
External
Thread (Mod.)
Class 2A
H
Length
J
±.030
K
C'Bore
Depth
Install Tool
Part No.
MS51830CA105 217-078321 MS51830CA105L 217-079321 10 - 24 5/16 - 18 .312 .22 .07 217-072568
MS51830CA201
NAS1394CA3
217-078521 MS51830CA201L
NAS1394CA3L
217-079521 10 - 32 217-072569
MS51830CA106 217-078322 MS51830CA106L 217-079322 1/4 - 20 3/8 - 16 .375 .22 .07 217-072570
MS51830CA202
NAS1394CA4
217-078522 MS51830CA202L
NAS1394CA4L
217-079522 1/4 - 28 217-072571
MS51830CA107 217-078323 MS51830CA107L 217-079323 5/16 - 18 7/16 - 14 .437 .22 .07 217-072572
MS51830CA203
NAS1394CA5
217-078523 MS51830CA203L
NAS1394CA5L
217-079523 5/16 - 24 217-072573
MS51830CA108
217-078324 MS51830CA108L
217-079324 3/8 - 16 1/2 - 13 .500 .24 .07 217-072574
MS51830CA204
NAS1394CA6
217-078524 MS51830CA204L
NAS1394CA6L
217-079524 3/8 - 24 217-072575
MS51830CA109
217-078325 MS51830CA109L
217-079325 7/16 - 14 9/16 - 12 .562 .27 .07 217-072576
MS51830CA205
NAS1394CA7
217-078525 MS51830CA205L
NAS1394CA7L
217-079525 7/16 - 20 217-072577
MS51830CA110
217-078326 MS51830CA110L
217-079326 1/2 - 13 5/8 - 11 .625 .28 .07 217-072578
MS51830CA206
NAS1394CA8
217-078526 MS51830CA206L
NAS1394CA8L
217-079526 1/2 - 20 217-072579
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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