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MS/NAS Style - 303 CRES Keylocking Threaded Inserts
Heavy Duty- Inch

Material: Insert - 303 CRES
  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: None
Lubrication: Dry Film Lube on Self-Locking Inserts only
Performance: MIL-I-45914A (MS51831& NAS1395)
 

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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.
NAS1395C08 217-076300 NAS1395C08L 217-077300 8 - 32 5/16 - 18 .312 .22 .04 217-072590
MS51831-101 217-076301 MS51831-101L 217-077301 10 - 24 3/8 - 16 .312 .22 .07 217-072591
MS51831-201
NAS1395C3
217-076501 MS51831-201L
NAS1395C3L
217-077501 10 - 32 217-072592
MS51831-102 217-076302 MS51831-102L 217-077302 1/4 - 20 7/16 - 14 .375 .22 .07 217-072593
MS51831-202
NAS1395C4
217-076502 MS51831-202L
NAS1395C4L
217-077502 1/4 - 28 217-072594
MS51831-103 217-076303 MS51831-103L 217-077303 5/16 - 18 1/2 - 13 .437 .22 .07 217-072595
MS51831-203
NAS1395C5
217-076503 MS51831-203L
NAS1395C5L
217-077503 5/16 - 24 217-072596
MS51831-104 217-076304 MS51831-104L 217-077304 3/8 - 16 9/16 - 12 .500 .25 .07 217-072597
MS51831-204
NAS1395C6
217-076504 MS51831-204L
NAS1395C6L
217-077504 3/8 - 24 217-072598
MS51831-105 217-076305 MS51831-105L 217-077305 7/16 - 14 5/8 - 11 .625 .28 .10 217-072599
MS51831-205
NAS1395C7
217-076505 MS51831-205L
NAS1395C7L
217-077505 7/16 - 20 217-072600
MS51831-106 217-076306 MS51831-106L 217-077306 1/2 - 13 11/16 - 11 NS .688 .28 .10 217-072601
MS51831-206
NAS1395C8
217-076506 MS51831-206L
NAS1395C8L
217-077506 1/2 - 20 217-072602
MS51831-107 217-076307 MS51831-107L 217-077307 9/16 - 12 13/16 - 16 .812 .32 .10 217-072603
MS51831-207
NAS1395C9
217-076507 MS51831-207L
NAS1395C9L
217-077507 9/16 - 18 217-072604
MS51831-108 217-076308 MS51831-108L 217-077308 5/8 - 11 7/8 - 14 .875 .33 .10 217-072605
MS51831-208
NAS1395C10
217-076508 MS51831-208L
NAS1395C10L
217-077508 5/8 - 18 217-072606
MS51831-109 217-076309 3/4 - 10 1-1/8 - 12 1.125 .10 217-072607
MS51831-209 217-076509 3/4 - 16 217-072608
MS51831-109L 217-077309 3/4 - 10 1.250 .49 217-072607
MS51831-209L 217-077509 3/4 - 16 217-072608
MS51831-110 217-076310 7/8 - 9 1-1/4 - 12 1.250 .10 217-072609
MS51831-210 217-076510 7/8 - 14 217-072610
MS51831-110L 217-077310 7/8 - 9 1.375 .49 217-072609
MS51831-210L 217-077510 7/8 - 14 217-072610
MS51831-111 217-076311 1" - 8 1-3/8 - 12 1.375 .10 217-072611
MS51831-211 217-076511 1" - 12 217-072612
MS51831-111L 217-077311 1" - 8 1.500 .55 217-072611
MS51831-211L 217-077511 1" - 12 217-072612
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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