MS51021/NASM51021

FED. SUP CLASS
5305       

NOTES:

1. MATERIAL: Corrosion-Resisting Steel , 300 Series, in accordance with procurement specification.

2. PROTECTIVE COATING: Passivated in accordance with QQ-P-35.

3. THREADS: The threads shall be in accordance with MlL-S-7742.

4. MAGNETIC PERMEABILITY: These set screws have a magnetic permeability of 2.0 max (air = 1.0)
for a field strength of H = 200 oersteds, when using a magnetic indicator per MIL-I-17214.

5. DIMENSIONS: All dimensions are in inches, unless otherwise specified.

6. TOLERANCES: Angles +5 degrees, unless otherwise specified.

7. PART NUMBER: The MS part number consists of the MS number, plus the dash number.

Example: M551023-1.

8. SELF-LOCKING ELEMENT:

(a) The self-locking element shall be in accordance with MIL-F-18240.

(b) For design and usage limitations, see MS15981.

(c) Location of effective locking area shall be in accordance with MS15981.

(d) Maximum ring gage diameter that locking region of setscrew must pass thru freely or with
finger pressure shall be the nominal size plus 0.010.

(e) MIL-F-18240 doesn't establish torque requirements for lengths above the dashed line.
Only a positive indication of torque is required.

9. Referenced documents shall be of the issue in effect on date of invitations for bid.

10. For design feature purposes, this standard takes precedence over procurement documents 
referenced herin.

INTERCHANGEABILITY

Screws covered by the dash numbers given in MS51024 are cancelled after 29 January 1964 and superseded by the screws covered on MS51023 having the same dash numbers. Cancelled screws may be used
until existing stocks are depleted. Use only MS51023 screws for new design.

Screws covered by the dash numbers given in MS18064 in part are cancelled.
Cancelled screws may be used until existing stocks are depleted. Use only the superseding screws
for new design. Replacement shall be in accordance with Table II.