MS51966/NASM51966


FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) 29 DEC 1972

NOMINAL SIZE .060 .086 .112 .138 .164 .190 .250 .3125 .375 .500
THREADS PER INCH (UNF_3A) 80 64 48 40 36 32 28 24 24 20
J SOCKET WIDTH
ACROSS FLATS
NOW .028 .035 .050 .062 .078 .094 .125 .156 .188 .250
C POINT DIAMETER MAX
MIN
.033
.027
.047
.039
.061
.051
.074
.064
.087
.076
.102
.088
.132
.118
.172
.156
.212
.194
.291
.270
L LENGTH TOL DASH NUMBER
PLAIN PLAIN PLAIN PLAIN PLAIN PLAIN SELF-LOCKING PLAIN SELF-LOCKING PLAIN SELF-LOCKING PLAIN SELF-LOCKING PLAIN SELF-LOCKING
.062
.125
.188
.250
.312

.375
.438
.500
.562
.625
+.010 1*
7*
8*
9*

16*
17*
18*
19*

25*
26*
27*
28*

29*

35*
36*
37*
38*

39*

40*

41*


48*
49*
50*

51*

52*

53*

110*
111
112
113

114
115*
116
117*
118



60*
61*

62*

63*

64*

121*
122
123

124
125*
126
127*
128



73*
74*

75*

76*

77*


134
135

136

137

138



86*

87*

88*

89*





146
147

148



98*

99*

100*

101*





156

157

158
.750
.875
1.000
1.250

1.500
1.750
2.000
+.020 42* 54* 119

120
65*
66*
67*
129
130
131
132

133
78*
79*
80*
139
140
141
142

143
144
145
90*
91*
92*
149
150
151
152

153
154
155
102*
103*
104*
159
160
161
162

163
164
165
2.500
3.000
+.031 166
167
(A)
  • Inactive for new design after 29 DEC 1972 .
    NOTES:
  1. MATERIAL : ALLOY STEEL IN ACCORDANCE WITH PROCUREMENT SPECIFICATION, HAVING A ROCKWELL HARDNESS OF C45-53
  2. PROACTIVE COATING: CADMIUM PLATED IN ACCORDANCE WITH PROCUREMENT SPECIFICATION.
  3. THREADS:THE THREADS SHALLL BE IN ACCORDANCE WITH MIL-S-7742.
  4. DIMENTIONS:ALL DIMENTIONS ARE IN INCHES, UNLESS OTHERWISE SPECIFIED.
  5. PART NUMBER: THE PART NUMBER CONSISTS OF THE MS NUMBER, PLUS THE DASH NUMBER.
    EXAMPLE: MS51966_1
  6. SELF-LOCKING ELEMENT:


    (A)
    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 MS15981.
    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 DOCUMENTS 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.
(A) For changes see sheets 1 and 2.
P.A WC
Order Cust
AS
82
TITLE
SETSCREW - HEXAGON SOCKET, FLAT POINT,
ALLOY STEEL, CADMIUM PLATED, UNF - 3A
PLAIN AND SELF - LOCKING          (A)
MILITARY STANDARD
MS 51966
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51026, MS51028 and in part MS18065, BCTX2.6, BCTX2.7, BCTX2.13, BCTX2.15, BCUX1, BCUX3 and BCUX5, SHEET       1       of       2
FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) FOR CHANGES SEE SHHET 1 AND 2.





INTERCHANGEABILITY

Screws covered by the dash numbers given in MS51026 and MS 51028 are cancelled after 29 January 1964 and superseded by screws covered on MS51966 having same dash number. Cancelled screws may be used until existing stock are depleted. Use only the MS51966 screws for new design.

Screws covered by the dash numbers given in MS18065 in part are cancelled.
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.
(A)        TABLE II
CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING
MS18065 MS51966 MS18065 MS51966 MS18065 MS51966 MS18065 MS51966
DASH NUMBER DASH NUMBER DASH NUMBER DASH NUMBER
4
8
13
19
25
31
36
44
49
56

68
9
14
20
26
110
111
112
113
114

115
116
117
118
119
120
121
122
123
124
32
17
45
50
57

63
69
73
77
15

22
27
38
51
58
125
126
127
128
129

130
131
132
133
134

135
136
137
138
139
64
70
74
78
81

84
91
39
52
59

65
71
75
79
140
141
142
143
144

145
146
147
148
149

150
151
152
153
82
85
92
40
53

60
66
72
76
80

83
86
87
88
154
155
156
157
158

159
160
161
162
163

164
165
166
167
P.A WC
Order Cust
AS
82
TITLE
SETSCREW - HEXAGON SOCKET, FLAT POINT,
ALLOY STEEL, CADMIUM PLATED, UNF - 3A
PLAIN AND SELF - LOCKING          (A)
MILITARY STANDARD
MS 51966
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51026, MS51028 and in part MS18065, BCTX2.6, BCTX2.7, BCTX2.13, BCTX2.15, BCUX1, BCUX3 and BCUX5, SHEET       2       of       2

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