MS51963/NASM51963


FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) 28 NOV 1967 (B) 10 SEP 1969 (C) 29 DEC 1972

NOMINAL SIZE .086 .112 .138 .164 .190 .250
THREADS PER INCH (UNC_3A) 56 40 32 32 24 20
J SOCKET WIDTH
ACROSS FLATS
NOM .035 .050 .062 .078 .094 .125
C POINT DIAMETER MAX
MIN
.047
.039
.061
.051
.074
.064
.087
.076
.102
.088
.132
.118
C1 POINT LENGTH MAX
MIN
.043
.038
.056
.051
.069
.062
.082
.074
.095
.086
.125
.114
C2 POINT DIAMETER MAX
MIN
.043
.038
.059
.054
.074
.068
.090
.084
.101
.095
.156
.150
S POINT LENGTH MAX
MIN
.010
.007
.013
.008
.017
.012
.021
.016
.024
.019
.027
.022
L LENGTH TOL DASH NUMBER
PLAIN PLAIN SELF
LOCK
PLAIN SELF
LOCK
PLAIN SELF
LOCK
PLAIN PLAIN
.125
.188
.250
.312
.375

.438
.500
.562
.625
+.010 1
2
3
9
10
11
12
13

14
15

16
210
211
212
213
214

215
216
217
218
20
21
22
23
24

25
26

27
220
221
222
223
224

225
226
227
228
33
24
35
36
37

38
39

40
240
241
242
243
244

245
246
247
248

46
47
48
49

50
51

52

62
63
64
65

66
67

68
.750
.875
1.000
1.250

1.500
1.750
2.000
+.020 28
29
30
229
230
41
42
43
249
250
251
53
54
55
56
69
70
71
72

73
74
75
(C) For changes see sheets 1, 2 and 3.
P.A WC
Order Cust
82
TITLE
SETSCREW - HEXAGON SOCKET, CUP POINT,
ALLOY STEEL, CADMIUM PLATED, UNC - 3A,
PLAIN AND SELF-LOCKING     (C)
MILITARY STANDARD
MS 51963
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51017, MS51019, MS51055 and in part MS18063, MS51051, BCTX1, 1.1, 1.2, 3 and 5, BCUX5 and 5.1. SHEET       1       of       3

TABLE I (Cont'd) (C)

FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) 28 NOV 1967 (B) 10 SEP 1969 (C) FOR CHANGES SEE SHEET 1, 2 AND 3.

NOMINAL SIZE .3125 .375 .4375 .500 .625 .750 .875 1.000
THREADS PER INCH (UNC_3A) 18 16 14 13 11 10 9 8
J SOCKET WIDTH
ACROSS FLATS
NOM .156 .188 .219 .250 .312 .375 .500 .562
C POINT DIAMETER MAX
MIN
.172
.156
.212
.194
.252
.232
.291
.270
.371
.347
.450
425
.530
.502
.609
579
C1 POINT LENGTH MAX
MIN
.156
.144
.187
.174
.218
.204
.250
.235
.312
.295
.375
.357
.437
.418
.500
480
C2 POINT DIAMETER MAX
MIN
.190
.185
.241
.236
.286
.281
.333
.328
.425
.420
.523
.518
--- ---
S POINT LENGTH MAX
MIN
.038
.033
.041
.036
.047
.042
.054
.049
.067
.062
.081
.076
--- ---
L LENGTH TOL DASH NUMBER
PLAIN PLAIN PLAIN PLAIN PLAIN PLAIN PLAIN PLAIN
.250
.312
.375

.438
.500
.625
+.010 81
82
83

84
85
86
99
100
101

102
103
104


118

119
120
121


135
136
137
138





153
154






169
.750
.875
1.000
1.250

1.500
1.750
2.000
+.020 87
88
89
90

91
92
93
105
106
107
108

109
110
111
122
123
124
125

126
127
128
139
140
141
142

143
144
145
155
156
157
158

159
160
161
170
171
172
173

174
175
176

184
185
186

187
188
189


197
198

199
200
201
2.500
3.000
+.031 112 129 146
147
162
163
177
178
190
191
202
203
NOTES:
  1. MATERIAL : Alloy steel,, in accordance with procurement specification, having a Rockwell Hardness of C46-53.
  2. PROTECTIVE COATING: Cadmium plated in accordance with procurement specification.
  3. THREADS: The threads shall be in accordane with MIL_S_7742.
  4. DIMENTIONS:All dimensions are in inches, unless otherwise specidied.
  5. PART NUMBER: The MS part number consists of the MS number, plus the dash number.
    Example: MS51963_1.
  6. SELF-LOCKING ELEMENT:


    (C)
    1. The self-lockingh element shall be in accordance with MIL-F-18240.
    2. For design and usage limitations, See MS15981.
    3. Location of effective loacking area shall be in accordance with MS51981.
    4. 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.
    5. MIL-F-18240 doesn't establis torque requirement for lengths above the dashed line. Only a positive indication of torque is required.
  7.   Referenced douments shall be of the issue in effect on date of invitations for bid.
  8.   For design feature purposes, this standard takes precedence over procurement documents referenced herein.
P.A WC
Order Cust
82
TITLE
SETSCREW - HEXAGON SOCKET, CUP POINT,
ALLOY STEEL, CADMIUM PLATED, UNC - 3A,
PLAIN AND SELF-LOCKING     (C)
MILITARY STANDARD
MS 51963
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51017, MS51019, MS51055 and in part MS18063, MS51051, BCTX1, 1.1, 1.2, 3 and 5, BCUX5 and 5.1. SHEET       2       of       3
FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) 28 NOV 1967 (B) 10 SEP 1969 (C) FOR CHANGES SEE SHEET 1, 2 AND 3.





INTERCHANGEABILITY

Effective 31 December, 1960, MS51055 was cancelled ad superseded by MS51017.

Screws covered by the dash numbers given in MS51053 and MS 51019 are cancelled after January 1964 and superseded byt screws covered on MS51963 having same dash number. Cancelled screws may be used until existing stock are depleted. Use only the MS51963 screws for new design.

Screws covered by the dash numbers given in MS51053 and MS 51053 in part are cancelled/ inactivated after 10 September 1969. Cancelled screws may be used until existing stock are depleted. Use only the superseded screws for new design. Replacement shall be in accordance with Table II.
TABLE II
CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING
MS51053 MS51963 MS51053 MS51963 MS51053 MS51963 MS51053 MS51963
DASH NUMBER DASH NUMBER DASH NUMBER DASH NUMBER
101
102
103
104
105
111
113
**
1
2
3
**
**
10
114
115
116
117
118
119
11
12
13
14
15
**
120
126
127
128
129
130
16
20
21
22
23
24
131
132
133
134
135
136
25
26
**
27
28
29
** No Replacement




Screws covered by the dash numbers given in MS18063 are cancelled.
Cancelled screws may be used until existing stock are depleted, Use only the superseding screws for new design. Replacement shall be in accordance with Table III.
TABLE III             (C)
CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING
MS18063 MS51963 MS18063 MS51963 MS18063 MS51963 MS51053 MS51963
DASH NUMBER DASH NUMBER DASH NUMBER DASH NUMBER
1
5
10
16
22
89
33
41
210
211
212
213
214
215
216
217
46
2
6
11
17
23
90
34
218
220
221
222
223
224
225
226
42
47
54
61
3
7
12
18
227
228
229
230
240
241
242
243
24
30
35
43
48
55
62
67
244
245
246
247
248
249
250
251
P.A WC
Order Cust
82
TITLE
SETSCREW - HEXAGON SOCKET, CUP POINT,
ALLOY STEEL, CADMIUM PLATED, UNC - 3A,
PLAIN AND SELF-LOCKING       (C)
MILITARY STANDARD
MS 51963
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51017, MS51019, MS51055 and in part MS18063, MS51051, BCTX1, 1.1, 1.2, 3 and 5, BCUX5 and 5.1. SHEET       3       of       3

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