MS51831 at a glance

Specification

Item	Value
Type	Threaded insert, key locked
Material	Corrosion-resistant steel; A in place of the dash: alloy steel
Status	Check the current issue before design use.

Part no.	Size	External thread	Length, in	Locking tabs
MS51831-201	.1900-32	.3750-16	.312	2
MS51831-201L	.1900-32	.3750-16	.312	2
MS51831A201L	.1900-32	.3750-16	.312	2
MS51831-202	.2500-28	.4375-14	.375	2
MS51831-202L	.2500-28	.4375-14	.375	2
MS51831-203L	.3125-24	.5000-13	.437	4
MS51831-204L	.3750-24	.5625-12	.500	4

Part numbers commonly stocked. The standard governs and may list others.

Part	Meaning
A	Letter: In place of the dash: alloy steel
L	Letter: After the dash number: internal thread lock
Example	MS51831-201 — Internal thread .1900-32, external .3750-16

The size column is the internal thread. A in place of the dash indicates alloy steel; L after the dash number indicates an internal thread lock.
The listing names NAS1395 as the alternate number.

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MS51831 — Insert, Heavy Duty, Locked In, Key Locked, Corrosion-Resistant Steel — nominal sizes and part numbers.

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.