MS27769 Plug, Pipe, Countersink Hex Head

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MS27769B

Magnesium alloy AZ31B shall be in accordance with ASTM B107/B107M.

Corrosion resistant steel (CRES), type 347, shall be in accordance with SAE-AMS5646. CRES, type 321 shall be in accordance with SAE-AMS5645.

Titanium alloy shall be in accordance with SAE-AMS4928 (6AI-4V annealed). Materials and finishes designators shall be in accordance table I.

TABLE I. Material and finish designators.

Designator	Material	Finish
Blank	Steel	Carbon steel cadmium plated in accordance with SAE-AMS-QQ-P-416, type II, class 2
A	Steel	Zinc plating in accordance with ASTM B633; type VI, Fe/Zn 5
C	Copper alloy	See Procurement Specification
M	Magnesium alloy 2/	Magnesium finish in accordance with SAE-AMS-M-3171, Type III
R	CRES, alloy 321	See Procurement Specification
S	CRES, alloy 347	See Procurement Specification
T	Titanium alloy 1/	Cold finished in accordance with SAE-AMS2241
U	Unplated steel	See Procurement Specification
W	Aluminum	See Procurement Specification

1/ Titanium shall not be used in oxygen systems.

2/ Magnesium alloy plugs shall not be used in hydraulic systems or valves. Magnesium metal shall not be used in oxygen systems. In addition, its alloys are not to be used except in areas with minimal

exposure to corrosive environments. Reactivity with halogenated compounds constrains its use with lubricants containing chlorine and fluorine.

Part or Identifying Number (PIN): The PIN consists of the letters "MS," the specification sheet number, a dash or letter from table 3 to designate the material type, and a number to designate pipe plug size. Unassigned PIN's shall not be used.

MS27769 W 4

Pipe plug size (see figure 1)

Material letter (see table I) Specification sheet number

MS prefix

PIN example: MS27769W4 indicates a pipe plug, aluminum alloy 7075-T73, 3/8 -18 ANPT.

Cadmium is not recommended. To the users of this document, it is recommended that the use of carbon steel material with cadmium plating be used only when other materials and finishes specified in this document cannot meet performance requirements.