MS51830 keylocking inserts.

// FAMILY SELECTION

Choose the insert family before the thread

MS51830 identifies miniature and lightweight keylocking inserts. The outside thread and insert envelope must suit the parent component as well as the screw entering the insert. MS51831 and MS51832 cover different duty families, so an internal-thread match alone does not establish an equivalent outside fit.

// THREAD TABLE

Internal and external thread references

Use the 16 internal/external thread relationships below to help identify the required MS51830 insert. The summary follows revision G. Confirm the issue required by your drawing and purchase order. Modified external minor diameters, insert dimensions, tolerances and installation requirements are not reproduced here.

// MATERIAL AND FINISH

Material and finish notation

Revision G uses the following material designators in place of the separator dash.

Revision G permits QX in place of A for ground vehicle applications; this is not a general substitution authorization for other applications.

// PART-NUMBER EXAMPLES

Internal locking and application suffixes

Revision G distinguishes application-specific locking and lubrication. L specifies internal thread lock for aerospace applications, with SAE AS5272 Type I dry-film lubricant. LM specifies internal thread lock for non-aerospace applications, with MIL-PRF-46010 lubricant. Leave the suffix blank when internal thread lock is not required.

These examples explain revision G notation and do not indicate Webson stock. MIL-PRF-46010 lubricant is not technically equivalent to the earlier MIL-L-46010 Type I lubricant; aerospace use requires validation. Confirm the complete requirement before requesting an alternative.