MS51993B
TABLE IV. Interchangeability
Cancelled (CRES 17-10P) |
New (CRES Type A-286) |
MS51993 P643 P644 P645 P647 P648 |
MS51993 C643 C644 C645 C647 C648 |
NOTES:
1. Material: (See material code letters under mechanical properties) Steel, alloy 4140 per SAE AMS6349 or SAE AMS6382.
Steel, corrosion-resistant, Type A286 (UNS S66286) per SAE AMS5731, SAE AMS5732, SAE AMS5734 or SAE AMS5737.
Titanium, alloy 6 Al-4V, annealed per SAE AMS6931.
2. Protective coating: Steel, alloy shall be cadmium plated in accordance with SAE AMS-QQ-P-416, Type II, Class 3.
Steel, corrosion-resistant, material code letter "S", shall be passivated in accordance with SAE AMS2700 when internal non-lock thread is specified by part number.
Steel, corrosion-resistant, material code letter "S" shall be silver plated in accordance with ASTM B700,
Type II, Grade B, .0002 thick when internal locking thread is specified by part number. Titanium, alloy, shall have an anodic coating.
3. Surface roughness: Machine surfaces shall be 125 microinches in accordance with ASME B46.1 except serrated collar.
4. Threads: The external thread has a special pitch diameter and minor diameter which installs into a SAE AS8879 class 3B
tapped hole. Threads also shall be in accordance with procurement specification.
5. Heat treatment: Inserts shall be heat treated to develop the mechanical properties specified herein.
6. Mechanical Properties. All of the above insert sizes in either short, medium, or long lengths are capable of developing
220,000 psi load rating based on the tensile stress area of the applicable bolt. Resistance to pull out of the insert from the parent material is a function of shear engagement area of the external thread of
the insert as defined in the procurement specification. Material code letters with pertinent length dash numbers are listed below:
Material Code Letter Material
M Steel, 4140 alloy
S Steel, Type A286 cres
T Titanium, 6Al-4V alloy
("T" code only available as non-locking insert)
7. Hardness: Steel, alloy (code M) Rockwell C33 minimum.
Steel, cres (code S) Brinell 248 minimum. Titanium, alloy (code T) Rockwell C39 maximum.
8. Fillets: .030 R max.
9. Edges: Break sharp edges .003 - .015 unless otherwise specified.
10. Dimensions: Dimensions are in inches and are met after plating.
11. Tolerances: Linear dimensions ±.005, angular dimensions ±2°.
12. Part numbers: The MS part number shall consist of the basic MS number, plus the material code, plus the dash number. Add
"L" as suffix for internal thread lock."
Examples: MS51993 M 505 Insert, alloy steel, non-locking.
MS51993 S 505 Insert, CRES, non-locking. MS51993 T 805 Insert, Titanium alloy, non-locking
* MS51993 M 505 L Insert, alloy steel, internal thread lock
* The same condition can exist for all of the above materials except "T" code.
13. For design feature purposes, this standard takes precedence over procurement documents referenced herein.
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