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INCH-POUND MS51957D 25 April 1997 Superseding MS51957C 18 July 1986 MILITARY SPECIFICATION SHEET SCREW, MACHINE, PAN HEAD, CROSS-RECESSED, CORROSION RESISTANT STEEL, UNC-2A This specification is approved for use by all Departments and Agencies of the Department of Defense.
The requirements for acquiring the product described herein shall consist of this specification sheet and the issue of the following specification listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation: FF-S-92.
D Entire document revised
AMSC N/A 1 of 7 DISTRIBUTION STATEMENT A. Approve for public release; distribution is unlimited.
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FSC 5305
MS51957D Table I. Dimensions and Dash Numbers.
D Nominal Size
.0860 Max Min Max Min Max Min 56 .0860 .0717 .1670 .1550 .0620 .0530 .0100 .0130 1 300 Dash No. 1 2 3 4 5 6 7 141 8 9 10 142
2/
.1120 40 .1120 .0925 .2190 .2050 .0800 .0700 .0100 .0170 1 480 Dash No. 11 12 13 14 15 16 17 120 18 19 20 21 121 22
2/
.1380 32 .1380 .1141 .2700 .2560 .0970 .0870 .0150 .0210 2 730 Dash No. 24 25 26 27 28 29 30 123 31 32 33 34 124 35
2/
.1640 32 .1640 .1399 .3220 .3060 .1150 .1050 .0150 .0250 2 1,120 Dash No. 39 40 41 42 43 44 45 126 46 47 48 49 127 50
2/
.1900 24 .1900 .1586 .3730 .3570 .1330 .1220 .0200 .0290 2 1,400 Dash No. 58 59 60 61 62 63 129 64 65 66 67 130 68
1/
.2500 20 .2500 .2127 .4920 .4730 .1750 .1620 .0350 .0380 3 2,540 Dash No.
.3125 18 .3125 .2712 .6150 .5940 .2180 .2030 .0400 .0470 4 4,190 Dash No.
.3750 16 .3750 .3287 .7400 .7160 .2610 .2440 .0400 .0560 4 6,200 Dash No.
Threads Per Inch UNC-2A
D1 Body Diameter A Head Diameter
H Head Height
P Head Radius Ref R Fillet Radius Max Driver Size Tensile Strength Lbs-Min L Length Tolerance .125 .188 .250 .312 .375 .438 .500 .562 .625 .750 .875 1.000 1.125 1.250 1.375 1.500 1.750 2.000 2.250 2.500 2.750 3.000 +0 -.062
+0 -.031
76 77 78 79 132 80 81 82 83 133 84
2/
92 93 94 135 95 96 97 98 136 99
2/
107 138 108 109 110 111 139 112
2/
2/
2/
2/
2/
2/
2/
2/
2/
2/
1/ 2/
122 23
125 36 37 38
2/
+0 -.094
128 51 52 53 54 55 56 57
2/
131 69 70 71 72 73 74 75
2/
134 85 86 87 88 89 90 91
2/
137 100 101 102 103 104 105 106
2/
1/ 1/
1/ 1/
1/ 1/
140 113 114 115 116 117 118 119
2/
1/ Indicates manufacturer's non-stock production items 2/ Inactive for new design after 18 July 1986 REQUIREMENTS: 1. MATERIAL: Austenitic Corrosion-Resistant Steel screws shall be manufactured from Type 302 (UNS S30200), Type 304 (UNS S30400), Type 304L (UNS S30403), Type 305 (UNS S30500), Type 316 (UNS S31600), Type 316L (UNS S31603), Type 384 (UNS S38400), or Type XM-7 (UNS S30430) in accordance with chemical composition specified in QQ-S-763. (See Material Identification Marking and Material Code). 2. FINISH: Passivate in accordance with QQ-P-35 or Black Oxide coating (except for Type 316 or Type 316L) in accordance with MIL-C-13924, Class 4. (See Finish Code). 3. MECHANICAL PROPERTIES: The minimum tensile strength in load pounds, indicated for each size in Table I, is based on 80,000 PSI Minimum Tensile Strength. Load pounds are calculated by the stress areas indicated in FED-STD-H28/2. The yield strength, based on .2 percent offset, shall be 30,000 psi minimum.
2
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MS51957D Requirements: (Continued) 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-STDH28/2. Acceptability of screw threads shall be in accordance with FED-STD-H28/20. Threads shall extend to within two threads or less of the bearing surface of the head, except that all lengths over 2.000 inches shall have a minimum complete thread length of 1.750 inches. 6. RECESS: Recess shall be in accordance with MS9006. 7. MATERIAL IDENTIFICATION MARKING: Type 316 (UNS S31600) or Type 316L (UNS S31603) CRES screws nominal size #10 (.1900) and larger shall be permanently marked "316". Markings shall be raised or depressed on the screw head at manufacturer's option. 8. 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 CorrosionResistant Steel Type 316 or Type 316L. 9. FINISH CODE: Passivate - No code letter after dash number, or after material code (if applicable) indicates passivate. Black Oxide - "B" after dash number, (not available for Type 316 or Type 316L CRES), indicates black oxide coating. 10. PART NUMBER: The part number shall consist of the basic MS number, followed by a dash number from Table I, a material code (if applicable), and a finish code (if applicable). Examples: MS51957-1 indicates Screw, Machine-Pan Head, Cross-Recessed, Optional 300 Series CRES, Passivated; .0860-56 UNC-2A Nominal Thread Size, .125 Length MS51957-1B indicates Screw, Machine-Pan Head, Cross-Recessed, Optional 300 Series CRES, Black Oxide Coated; .0860-56 UNC-2A Nominal Thread Size, .125 Length MS51957-1S316 indicates Screw, Machine - Pan Head, Cross-Recessed, Type 316 or Type 316L CRES, Passivated; .0860-56 UNC-2A Nominal Thread Size, .125 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. MS51957 Pan Head Machine Screws manufactured prior to 25 April 1997 may be used until stock is depleted.
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MS51957D
The screws covered by dash numbers given in MS16200, MS35216, MS35233, AN515 in part and AN526 in part are canceled/inactive after the dates indicated on the documents. Use the dash numbers given in the preceding sheets. The canceled screws cannot always replace the new screws and should be used until existing stock are depleted. Use only the new screws for design and replacement. Replacement should be in accordance with this table. Table II. Interchangeability CROSS REFERENCE OF PART NUMBERS CANCELED MS16200 MS35233 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 MS35216 AN515 DASH NUMBER C2-2 C2-3 C2-4 C2-5 C2-6 C2-7 C2-8 C2-10 C2-12 C3-2 thru C3-16 C4-3 C4-4 C4-5 C4-6 C4-7 C4-8 C4-10 C4-12 C4-14 C4-16 C4-18 C4-20 C4-22 C4-24 C4-26 C4-28 C5-3 thru C5-28 C6-3 C6-4 C6-5 C6-6 C6-7 C6-8 C6-10 C6-12 C6-14 C6-16 C6-18 C6-20 C6-22 C6-24 C6-26 C6-28 C6-30 C6-32 C6-36 C6-40 AN526
NEW MS51957
1 2 3 4 5 6 7 8 9
C2R2 C2R3 C2R4 C2R5 C2R6 C2R7 C2R8 C2R10 C2R12
1 2 3 4 5 6 7 8 9 10
2/
C3R2 thru C3R16 10 11 12 13 14 15 16 17 18 19 20 C4R3 C4R4 C4R5 C4R6 C4R7 C4R8 C4R10 C4R12 C4R14 C4R16 C4R18 C4R20 C4R22 C4R24 C4R26 C4R28 C5R3 thru C5R28 C6R3 C6R4 C6R5 C6R6 C6R7 C6R8 C6R10 C6R12 C6R14 C6R16 C6R18 C6R20 C6R22 C6R24 C6R26 C6R28 C6R30 C6R32 C6R36 C6R40
11 12 13 14 15 16 17 18 19 20 21 1211/ 22 1221/ 23
2/ 2/ 2/
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
C632R4 C632R5 C632R6 C632R7 C632R8 C632R9 C632R10 C632R12 C632R14 C632R16 C632R18 C632R20 C632R22 C632R24 C632R26 C632R28 C632R30 C632R32 C632R36 C632R40 C632R44 C632R48
C632-4 C632-5 C632-6 C632-7 C632-8 C632-9 C632-10 C632-12 C632-14 C632-16 C632-18 C632-20 C632-22 C632-24 C632-26 C632-28 C632-30 C632-32 C632-36 C632-40 C632-44 C632-48
24 25 26 27 28 29 30 1231/ 31 32 33 34 1241/ 35 1251/ 36
2/
37
2/
38
2/ 2/ 2/ 2/
1/ New dash numbers added 26 August 1968 2/ No replacement
4
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MS51957D
Table II. Interchangeability (Continued) CROSS REFERENCE OF PART NUMBERS CANCELED MS16200 MS35233 39 40 41 42 43 44 45 MS35216 AN515 DASH NUMBER 36 37 38 39 40 41 42 39 40 41 42 43 44 45 1261/ 46 47 48 49 1271/ 50 1281/ 51
2/
NEW AN526 MS51957
C8R4 C8R5 C8R6 C8R7 C8R8
C8-4 C8-5 C8-6 C8-7 C8-8
C832R4 C832R5 C832R6 C832R7 C832R8 C832R9 C832R10 C832R12 C832R14 C832R16 C832R18 C832R20 C832R22 C832R24 C832R26 C832R28 C832R30 C832R32 C832R36 C832R40 C832R44 C832R48 C1024R4 C1024R5 C1024R6 C1024R7 C1024R8 C1024R10 C1024R12 C1024R14 C1024R16 C1024R18 C1024R20 C1024R22 C1024R24 C1024R26 C1024R28 C1024R30 C1024R32 C1024R36 C1024R40 C1024R44 C1024R48 C420R6 C420R7 C420R8 C420R9 C420R10 C420R12 C420R14 C420R16 C420R18
C832-4 C832-5 C832-6 C832-7 C832-8 C832-9 C832-10 C832-12 C832-14 C832-16 C832-18 C832-20 C832-22 C832-24 C832-26 C832-28 C832-30 C832-32 C832-36 C832-40 C832-44 C832-48 C1024-4 C1024-5 C1024-6 C1024-7 C1024-8 C1024-10 C1024-12 C1024-14 C1024-16 C1024-18 C1024-20 C1024-22 C1024-24 C1024-26 C1024-28 C1024-30 C1024-32 C1024-36 C1024-40 C1024-44 C1024-48 C420-6 C420-7 C420-8 C420-9 C420-10 C420-12 C420-14 C420-16 C420-18
46 47 48 49 50 51
43 44 45 46 47 48
C8R10 C8R12 C8R14 C8R16 C8R18 C8R20 C8R22 C8R24 C8R26 C8R28 C8R30 C8R32 C8R36 C8R40 C8R44 C8R48 C10R4 C10R5 C10R6 C10R7 C10R8 C10R10 C10R12 C10R14 C10R16 C10R18 C10R20 C10R22 C10R24 C10R26 C10R28 C10R30 C10R32 C10R36 C10R40 C10R44 C10R48 C416R5 C416R6 C416R7 C416R8
C8-10 C8-12 C8-14 C8-16 C8-18 C8-20 C8-22 C8-24 C8-26 C8-28 C8-30 C8-32 C8-36 C8-40 C8-44 C8-48 C10-4 C10-5 C10-6 C10-7 C10-8 C10-10 C10-12 C10-14 C10-16 C10-18 C10-20 C10-22 C10-24 C10-26 C10-28 C10-30 C10-32 C10-36 C10-40 C10-44 C10-48 C416-5 C416-6 C416-7 C416-8 C416-10 C416-12 C416-14 C416-16 C416-18
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
49 50
52
2/
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65
53 54 55 56 57 58 59 60 61 62 63 1291/ 64 65 66 67 1301/ 68 1311/ 69
2/
70
2/
66 67 68 69 70 71 72 73
C416R10 C416R12 C416R14 C416R16 C416R18 1/ New dash numbers added 26 August 1968 2/ No replacement
71 72 73 74 75 76 77 78 79 1321/ 80 81 82 83 1331/
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MS51957D
Table II. Interchangeability (Continued) CROSS REFERENCE OF PART NUMBERS CANCELED MS16200 MS35233 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 MS35216 AN515 DASH NUMBER C416-20 C416-22 C416-24 C416-26 C416-28 C416-30 C416-32 C416-36 C416-40 C416-44 C416-48 AN526
NEW MS51957
74 75 76 77 78 79
C416R20 C416R22 C416R24 C416R26 C416R28 C416R30 C416R32 C416R36 C416R40 C416R44 C416R48
C420R20 C420R22 C420R24 C420R26 C420R28 C420R30 C420R32 C420R36 C420R40 C420R44 C420R48
C420-20 C420-22 C420-24 C420-26 C420-28 C420-30 C420-32 C420-36 C420-40 C420-44 C420-48
84 1341 85
2/
86
2/
80 81 82 83 84 85 86 87 88 89 90 91 92
93 94 95 96 97
C516R8 C516R10 C516R12 C516R14 C516R16 C516R18 C516R20 C516R22 C516R24 C516R26 C516R28 C516R30 C516R32 C516R36 C516R40 C516R44 C516R48 C616R6
C516-8 C516-10 C516-12 C516-14 C516-16 C516-18 C516-20 C516-22 C516-24 C516-26 C516-28 C516-30 C516-32 C516-36 C516-40 C516-44 C516-48 C616-6 C616-10 C616-12 C616-14 C616-16 C616-18 C616-20 C616-22 C616-24 C616-26 C616-28 C616-30 C616-32 C616-36 C616-40 C616-44 C616-48
87 88 89 90 91 92 93 94 95 96 97 98 1361 99 1371 100
2/
101
2/
102 103 104 105 106 107 108 109 110 111 1391 112 1401 113
2/
C616R10 C616R12 C616R14 C616R16 C616R18 112 98 C616R20 C616R22 113 99 C616R24 C616R26 114 100 C616R28 C616R30 115 101 C616R32 116 102 C616R36 117 103 C616R40 118 104 C616R44 119 105 C616R48 1/ New dash numbers added 26 August 1968 2/ No replacement
114
2/
115 116 117 118 119
6
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MS51957D Military Interests: Custodians: Army - AR Navy - YD1 Air Force - 99 Reviewer: Army - AV, AT, GL, ME, MI Navy -MC, SH National Security Agency - NSA Preparing activity: DLA - IS (Project 5305-2128)
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