There are two insert (ms21209f1-15l)included with standoff
A standoff that must have a threaded end(s) or be internally threaded its full length. For items having external threads on both ends, see stud (as modified). For items with an outside contour that is the same for the entire length, are flat on top and bottom, having internal threads its full length, and the length does not exceed twice the width across the flats or outside diameter, see nut (as modified); use maximum dimensions(s) for compliance.
NSN 5925-01-622-4447
NSN 4140-01-147-6558
NSN 5975-00-928-8429
NSN 5855-00-631-4565
NSN 5985-00-560-2152
NSN 5905-00-988-4379
NSN 5950-01-207-0929
NSN 6320-01-371-3047
NSN 6650-01-425-1934
NSN 5910-01-100-2053
NSN 6620-01-035-7803
NSN 5999-01-312-6454