MS35307E
3. MECHANICAL PROPERTIES: The minimum tensile strength in load pounds, indicated in Table I is based on
80,000 PSI Minimum Tensile Strength for diameters through .625 inch and 70,000 PSI Minimum Tensile Strength for diameters over .625 inch. The yield strength, based on .2 percent offset, shall be 30,000 psi minimum. The minimum hardness shall be HRB 80 for diameters through .625 inch and HRB 74 for diameters over .625 inch.
4. MAGNETIC PERMEABILITY: When specified, screws shall have a magnetic permeability of less than 2.0 maximum (air = 1.0) for a field strength H=200 Oersteds using a magnetic permeability indicator per ASTM A 342. Note: Cold working screws may not be capable of meeting permeability and strength requirements simultaneously.
5. THREADS: Screw threads shall be Unified external threads Class 2A UNC in accordance with FED-STD-H28/2. Acceptability of screw threads shall be in accordance with FED-STD-H28/20.
6. THREAD LENGTH: Minimum thread length shall be twice the diameter plus .250 inch. The tolerance shall be plus
.188 inch or 2.500 threads, whichever is greater. On screws that are too short for minimum thread lengths, the distance from the bearing surface of the head to the first complete thread shall not exceed the length of 2.500 threads for sizes up to and including 1.000 inch and 3.500 threads for sizes larger than 1.000 inch.
7. MANUFACTURER IDENTIFICATION MARKING: Screws shall be permanently marked with the manufacturer's symbol. Marking shall be raised or depressed on the screw head.
8. MATERIAL IDENTIFICATION MARKING: Heads shall be marked in accordance with MIL-HDBK-131. Additionally, Type 316 or Type 316L CRES screws shall be permanently marked "316". Markings shall be raised or depressed on the screw head at manufacturer's option.
9. MATERIAL CODE:
For 300 Series CRES - No code after dash number indicates any 300 Series Austenitic Corrosion-Resistant Steel listed in material requirement.
For Type 316 or Type 316L CRES - "S316" after dash number indicates Austenitic Corrosion-Resistant Steel Type
316 or Type 316L.
10. PART NUMBER: The part number shall consist of the basic MS number, followed by a dash number from Table I
and a material code (if applicable).
EXAMPLES: MS35307-301 indicates Screw, Cap, Hexagon Head, 300 Series Austenitic Corrosion-Resistant
Steel, Passivated; .2500-20 UNC-2A Nominal Thread Size, .375 Length
MS35307-301S316 indicates Screw, Cap, Hexagon Head, Austenitic Corrosion-Resistant Steel Type
316 or Type 316L, Passivated; .2500-20 UNC-2A Nominal Thread Size, .375
Length
NOTES:
1. All dimensions are in inches.
2. Interpret drawing in accordance with ASME Y14.5M.
3. In the event of a conflict between the text of this document and the references cited herein, the text of this document shall take precedence.
4. Unless otherwise specified, issues of referenced documents are those in effect at the time of solicitation.
5. MS35307 Hexagon Head Cap Screws manufactured prior to 25 April 1997 may be used until stock is depleted.
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