MS51964/NASM51964


FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (E) 10 SEP 88

MS21342 Fluted, Alloy, Cad Plated, Socket Set Screw


TABLE I. DASH NUMBERS AND DIMENSIONS

NOMINAL SIZE .060 .86 .112 .138 .164 .190
THREADS PER INCH 80 UNF-3A 64 UNF-3A 48 UNF-3A 40 UNF-3A 36 UNF-3A 32 UNF-3A
J SOCKET WIDTH
ACROSS FLATS
NOM .028 .035 .050 .062 .078 .094
C POINT MAX
MIN
.033
.027
.047
.039
.061
.051
.074
.064
.087
.076
.102
.088
C1 POINT LENGTH MAX
MIN
.032
.027
.043
.038
.056
.051
.069
.062
.082
.074
.095
.086
C2 POINT DIAMETER MAX
MIN
.027
.022
.043
.038
.059
.054
.074
.068
.090
.084
.101
.095
S POINT LENGTH MAX
MIN
.007
.004
.010
.007
.013
.008
.017
.012
.021
.016
.024
.019
L LENGTH TOLERANCE DASH NUMBER
PLAIN PLAIN PLAIN PLAIN PLAIN PLAIN SELF-LOCKING
.125
.188
.250
.312
.375

.438
.500
.562
.625
+.010 1
2
3
9*
10*
11*
17
18
19
20
21
27
28
29
30
31
37
38
39
40
41

42*
43

48
49
50
51

52*
53

54
120*
121
122
123
124

125*
126
127*
128
.750
1.000
1.250
+.020 55
56
57
129
130
* INACTIVE FOR NEW DESIGN AFTER 29 DECEMBER 1972
(E) ENTIRE STANDARD REVISED
P.A
ARMY - AR
Other Cust
AIR FORCE - 99
INTERNATIONAL
INTEREST
TITLE
SETSCREW - HEXAGON SOCKET, CUP POINT,
ALLOY STEEL, CADMIUM PLATED, UNF - 3A,
PLAIN AND SELF - LOCKING
MILITARY STANDARD
MS 51964
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51018, MS51020 AND IN PART MS18063, BCTX1, 1.1, 1.2, 3 and 5, BCUX5 and 5.1 PAGE       1       of       3
FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (E) FOR CHANGES SEE PAGES 1, 2 AND 3.


TABLE I. DASH NUMBERS AND DIMENSIONS - CONTINUED

NOMINAL SIZE .250 .3125 .375 .4375 .500
THREADS PER INCH .28 UNF - 3A .24 UNF - 3A .24 UNF - 3A .20 UNF - 3A .20 UNF - 3A
J SOCKET WIDTH
ACROSS FLATS
NOM .125 .156 .188 .219 .250
Φ C POINT MAX
MIN
.132
118
.172
156
.212
194
.252
232
.291
270
ΦC1 POINT MAX
MIN
.125
114
.156
144
.187
174
.218
204
.230
235
ΦC2 POINT MAX
MIN
.156
150
.190
185
.241
236
.286
281
.333
328
S POINT LENGTH MAX
MIN
.027
.022
.038
.033
.041
.036
.047
.042
.054
.049
L LENGTH TOLERANCE DASH NO
PLAIN SELF-LOCKING PLAIN SELF-LOCKING PLAIN SELF-LOCKING PLAIN PLAIN SELF-LOCKING
.188
.250

.312

.375

.438
.500
.562
.625
+.010 63
64

65

66

67*
68

69
131
132

133

134

135*
136
137*
138

78

79

80

81*
82*

83

144

145

146


147

148

92

93

94

95*
96

97





156


157

158





118*

119*
120*








107

108





666


167

168
.750
.875
1.000
1.250
1.500
1.750
2.000
+.020 70

71
72
139
140
141
142
143
84

85
86
149
150
151
152
153
154
155
98

99
100
101
159
160
161
162
163
164
165
109

110
111*
112*
169
170
171
172
173
174
175
2.500
3.000
+.031 176
177

* INACTIVE FOR NEW DESIGN AFTER 29 DECEMBER, 1972

TABLE I. DASH NUMBERS AND DIMENSIONS - CONTINUED

NOMINAL SIZE .625 .750 .875 .1.000 *
THREADS PER INCH .18 UNF - 3A .16 UNF - 3A .14 UNF - 3A .14 UNF - 3A
J SOCKET WIDTH
ACROSS FLATS
NOM .312 .375 .500 .562
Φ C POINT MAX
MIN
.371
.347
.450
.425
.530
502
.609
579
ΦC1 POINT MAX
MIN
.312
.294
.375
.357
.437
.418
.500
480
ΦC2 POINT MAX
MIN
.425
420
.523
518
--- ---
S POINT LENGTH MAX
MIN
.067
062
.081
076
--- ---
L LENGTH TOLERANCE DASH NO
PLAIN PLAIN PLAIN PLAIN
.250
.312
.375

.438
.500
.625
+.010




253
254





268
269
.750
.875
1.000
1.250
1.500
1.750
2.000
+.020 255
256
257
258

259
260
261
270
271
272
273

274
275
276
283
284
285
286

287
288
289
295*
296*
297*
298*

299*
300*
301*
2.500
3.000
+.031 262
263
277
278
290
291
302*
303*

* INACTIVE FOR NEW DESIGN AFTER 30 JUNE, 1988
P.A
ARMY - AR
Other Cust
AIR FORCE - 99
INTERNATIONAL
INTEREST
TITLE
SETSCREW - HEXAGON SOCKET, CUP POINT,
ALLOY STEEL, CADMIUM PLATED, UNF - 3A,
PLAIN AND SELF - LOCKING
MILITARY STANDARD
MS 51964
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51018, MS51020 AND IN PART MS18063, BCTX1, 1.1, 1.2, 3 and 5, BCUX5 and 5.1 PAGE       2       of       3
FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (E) FOR CHANGES SEE PAGES 1, 2 AND 3.






REQUIRMENTS:
  1. MATERIAL : ALLOY STEEL IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.

  2. PROACTIVE COATING AND SURFACE TREATEMENT: CADMIUM PLATED IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.

  3. THREADS:THE THREADS SHALLL BE IN ACCORDANCE WITH FED-STD-H28/2. ACCEPTABILITY OF SCREW THREADS FOR SIZES .190 AND SMALLER SHALL BE IN ACCORDANCE WITH FED-STD-H28/20, SYSTEM 21. ACCEPTABILITY IF SCREW THREADS FOR SIZES .250 AND LARGER SHALL BE IN ACCORDANCE WITH FED-STD-H28/2,SYSTEM 22. SLEF LOACKING SCREWS SHALL BE INSPECTED PRIOR TO INSTALLATION OF LOACKING ELEMENT.

  4. SELF-LOCKING ELEMENT:

    1. The self-lockingh element shall be in accordance with procurement document.

    2. Maximum ring gage diameter that loacking region of serscrew must pass thru freely or with finger pressure shall be the nominal size pluse 0.010.

    3. MIL-F-18240 doesn't establis torque requirement for lengths above the dashed line. Only a positive indication of torque is required.

  5. TOLERANCES: ANGLES +5°, UNLESS OTHERWISE SPECIFIED.


  6. PART NUMBER: THE PART NUMBER SHALL CONSIST OF THE BASIC MS NUMBER FOLLOWED BY A DASH NUMBER TAKEN FROM TABLE I.
    EXAMPLE:
    MS51964_1 INDICATES- SETSCREW, HEXAGON SOCKET, CUP POINT, ALLOY STEEL, CADMIUM PLATED; 060-80 UNF-3A; LENGTH .125; PLAIN.
NOTES:
  1. ALL DIMENSTIONS ARE IN INCHES.

  2. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS STANDARD AND THE REFERENCES CITED HEREIN. THE TEXT OF THIS STANDARD SHAL TAKE PRECEDENCE

  3. REFERENCED GOVERNMENT (OR NON-GOVERNMENT) DOCUMENTS OF THE ISSUE LIMITED IN THAT ISSUE OF THE DEPARTMENT OF DEFENSE INDEX OF SPECIFICATION AND STANDARDS (DOG1SS) SPECIFIED IN THE SPECIFICATION FROM A PART OF THIS STANDARD TO THE EXTENT SPECIFIED HEREIN.


INTERCHANGEABILITY RELATINSHIP

Screws covered by the dash numbers given in MS51018 and MS51020 are cancelled after 29 January 1964 and superseding by the screws covered on MS51964 having the same dash numbers. Cancelled Screw may be used until existing stocks are depleted. Use only MS51964 screws for new design.

Screws covered by the dash numbers given in MS18063 in part are cancelled.
Cancelled Screw may be used until existing stocks are depleted. Use only superseding screws for new design. Replacement shall be in accordance with Table II.
TABLE II. INTERCHANGEABILITY
CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING
MS18063 MS51964 MS18063 MS51964 MS18063 MS51964 MS18063 MS51964
DASH NUMBER DASH NUMBER DASH NUMBER DASH NUMBER
4
8
13
19
25
31
36
44
49
56

68
9
14
20
26
120
121
122
123
124

125
126
127
128
129
130
131
132
133
134
32
17
45
50
57

63
69
73
77
15

22
27
38
51
58
135
136
137
138
139

140
141
142
143
144

145
146
147
148
149
64
70
74
78
81

84
91
39
52
59

65
71
75
79
150
151
152
153
154

155
156
157
158
159

160
161
162
163
82
85
92
40
53

60
66
72
76
80

83
86
87
88
164
165
166
167
168

169
170
171
172
173

174
175
176
177
P.A
ARMY - AR
Other Cust
AIR FORCE - 99
INTERNATIONAL
INTEREST
TITLE
SETSCREW - HEXAGON SOCKET, CUP POINT,
ALLOY STEEL, CADMIUM PLATED, UNF - 3A,
PLAIN AND SELF - LOCKING
MILITARY STANDARD
MS 51964
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51018, MS51020 AND IN PART MS18063, BCTX1, 1.1, 1.2, 3 and 5, BCUX5 and 5.1 PAGE       3       of       3

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