AIA/NAS M27039-2007 pdf download SCREW, MACHINE, PAN HEAD, STRUCTURAL, CROSS RECESSED
Aluminum Alloy 2024 (UNS A92024) in accordance with QQ-A-430, Temper 2024-D, or AMS-QQ-A-225/6,
Temper T4.
Manganese Bronze (UNS C67000) in accordance with ASTM B 138/B 138 M.
Alloy Steel 8630 (UNS G86300) in accordance with MIL-S-6050, 26-32 HRC; or 8470 (UNS G87400) in
accordance with MIL-S-6049 AMS 6322; or 4130 (UNS G41300) in accordance with AMS-S-6758 or
AMS 6346.
Heat and Corrosion-Resistant Steel, A286 Iron Base Super Alloy (UNS S66286) in accordance with AMS 5731 or AMS 5732.
Finish:
Aluminum Alloy: Anodize, in accordance with MIL-A-8625, Type I or II.
Manganese Bronze: Cadmium Plate, in accordance with AMS-QQ-P-416, Type II, Class 3.
Manganese Bronze: uncoated.
Alloy Steel: Cadmium Plate, in accordance with AMS-QQ-P-416, Type II, Class 2.
Heat and Corrosion-Resistant Steel: Passivate in accordance with AMS 2700, Method 1, Type 2 or 8, Class 1,Test Method 102.
Tensile strength:
Aluminum Alloy: 62,000 psi min ultimate tensile strength.
Manganese Bronze: 85,000 psi min ultimate tensile strength.
Alloy Steel: 125,000 to 145,000 psi ultimate tensile strength.
Heat and Corrosion-Resistant Steel: 130,000 psi min ultimate tensile strength.
Threads:
Threads shall be in accordance with FED-STD-H28/2. Acceptability of screw threads shall be in accordance with FED-STD-H28/20, system 21.
Recess:
The recess shall be in accordance with NASM9006.
Code:
Add DD before dash number for Anodized Aluminum Alloy Screw.
Add BP before dash number for Cadmium Plated Manganese Screw.
Add B before dash number for uncoated Manganese Bronze Screw.
Add – before dash number for Cadmium Plated Alloy Steel Screw.
Add C before dash number for Heat and Corrosion-Resistant Steel Screw
Example of Part number:
The part number shall consist of basic MS number followed by the material and finish code followed by the dash number.
MS27039DD0809 – Screw, Machine – Pan Head Structural, Cross Recessed; .164-32 UNC-3A, .594 length, Anodized Aluminum Alloy Screw.
MS27039BP0809 – Screw, Machine – Pan Head Structural, Cross Recessed; .164-32 UNC-3A,.594 length, Cadmium Plated Manganese Screw.
MS27039B0809 – Screw, Machine – Pan Head Structural, Cross Recessed; .164-32 UNC-3A,.594 length, uncoated Manganese Bronze Screw.
MS27039-0809 – Screw, Machine – Pan Head Structural, Cross Recessed; .164-32 UNC-3A,.594 length, Cadmium Plated Alloy Steel Screw.
MS27039C0809 – Screw, Machine – Pan Head Structural, Cross Recessed; .164-32 UNC-3A,.594 length, Heat and Corrosion-Resistant Steel Screw.
Head Marking:
a. Basic part no. and applicable dash no. (Basic part optional for . 164-32 screw sizes) .
b. Material as follows: Aluminum Alloy – none, Bronze – “B”, Alloy Steel – “-“, Heat and Corrosion-Resistant Steel – “C”.
c. Manufacturer’ s trade-mark shall be added, location optional.
NOTES:
(1) Dimensions in inches.
(2) Screws shall be free from burrs and sharp edges.
(3) Dimensions apply after finish unless otherwise specified
(4) Shank diameter may be . 001 oversize for a maximum distance of . 031 adjacent to the head.
(5) This standard takes precedence over documents referenced herein.
(6) Referenced documents shall be the issue in effect on date of invitations for bid.
(7) Dimensioning and tolerancing per ANSI Y14. 5M-1982.

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