scope:

This military standard is approved by this Department of Defense and is mandatory of all activities. Selection for all new engineering and design applications and for repetitive use shall be made from this document.

1. MATERIAL: CARBON STEEL - BARS

ALUMINUM ALLOY - BARS

CORROSION RESISTANT STEEL - BARS

SEE PROCUREMENT SPECIFICATION.

2. FINISH: SEE PROCUREMENT SPECIFICATION.

3. BREAK ALL SHARP EDGES AND REMOVE ALL BURRS AND SLIVERS.

4. DIMENSIONS IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES: FRACTIONS ±1/64, ANGLES ±:½°.

5. PART NUMBERS:

NO CODE LETTER IN PART NUMBER FOR CARBON STEEL. ADD D IN PLACE OF DASH FOR ALUMINUM ALLOY (2024). ADD W IN PLACE OF DASH FOR ALUMINUM ALLOY (7075). ADD J IN PLACE OF DASH FOR CORROSION RESISTANT STEEL, TYPE 304. ADD K IN PLACE OF DASH FOR CORROSION RESISTANT STEEL, TYPE 316. ADD S AFTER DASH NUMBER FOR CORROSION RESISTANT STEEL, TYPE 347. PARTS ARE NOT TO BE MANUFACTURED FROM TYPE 304L STEEL AFTER 27 JUNE 1969. EXAMPLE OF PART NUMBERS: MS21903-4 - UNION, ¼ TUBING, CARBON STEEL. MS21903D4 - UNION, ¼ TUBING, ALUMINUM ALLOY (2024). MS21903W4 - UNION, ¼ TUBING, ALUMINUM ALLOY (7075). MS21903J4 - UNION, ¼ TUBING, CORROSION RESISTANT STEEL, TYPE 304. MS21903K4 - UNION, ¼ TUBING, CORROSION RESISTANT STEEL, TYPE 316. MS21903-4S - UNION, ¼ TUBING, CORROSION RESISTANT STEEL, TYPE 347.

6. PARTS CODED C ARE CANCELLED AFTER 27 JUNE 1969. PARTS CODED C MAY BE USED UNTIL STOCKS ARE EXHAUSTED. PARTS CODED J OR K MAY BE USED IN LIEU OF PARTS CODED C.

7. CERTAIN PROVISIONS (SCREW THREADS, HEXAGON SIZE AND UNDERCUT DIMENSIONS) OF THIS STANDARD ARE THE SUBJECT OF INTERNATIONAL STANDARDIZATION AGREEMENT . WHEN REVISION, OR CANCELLATION OF THIS STANDARD IS PROPOSED WHICH WILL AFFECT OR VIOLATE THE INTERNATIONAL AGREEMENT CONCERNED THE PREPARING ACTIVITY WILL TAKE APPROPRIATE RECONCILIATION ACTION THROUGH INTERNATIONAL STANDARDIZATION CHANNELS, INCLUDING DEPARTMENTAL STANDARDIZATION OFFICES, IF REQUIRED.

INACTIVE FOR DESIGN AFTER 2 MAY 1956. USE MS21924

FOR DESIGN FEATURE PURPOSES, THIS STANDARD TAKES PRECEDENCE OVER PROCUREMENT. DOCUMENTS REFERENCED HEREIN. REFERENCED DOCUMENTS SHALL BE OF THE ISSUE IN EFFECT ON DATE OF INVITATION FOR BID.

INTERNATIONAL INTEREST

SEE NOTE