MS51021/NASM51021


FED. SUP CLASS
5305

MS51021 per NASM51021 Cup Point, Stainless, Socket Set Screw

NOMINAL SIZE .086 .112 .138 .164 .190 .250 .3125 .375 .500
THREADS PER INCH
(UNC-3A)
56 40 32 32 24 20 18 16 13
J  SOCKET WIDTH
    ACROSS FLATS NOM
.035 .050 .062 .078 .094 .125 .156 .188 .250
C  POINT                     MAX
    DIAMETER              MIN
.047
.039
.061
.051
.074
.064
.087
.076
.102
.088
.132
.118
.172
.156
.212
.194
.291
.270
C1 POINT                    MAX
     DIAMETER              MIN
.043
.038
.056
.051
.069
.062
.082
.074
.095
.086
.125
.114
.156
.144
.187
.174
.250
.235
C2 POINT                    MAX
     DIAMETER              MIN
.043
.038
.059
.054
.074
.068
.090
.084
.101
.095
.156
.150
.190
.185
.241
.236
.333
.328
                   
S  POINT                    MAX
     DIAMETER              MIN
.010
.007
.013
.008
.017
.012
.021
.016
.024
.019
.027
.022
.038
.033
.041
.036
.054
.049
L  LENGTH TOL

DASH NUMBER

PLAIN PLAIN SELF-
LOCKING
PLAIN SELF-
LOCKING
PLAIN SELF-
LOCKING
PLAIN PLAIN PLAIN PLAIN PLAIN
.125
.188
.250
.312
.375

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

14
15
101
102
103
104
105

106
107
108
109
21
22
23
24
25
111
112
113
114
115

116
117
118
119

120
121

31
32
33
34


36
131
132
133
134
135

136
137
138
139

140
141
142

42
43
44
45


47

48

49

55
56
57
58


60

61

62

63


68
69
70


72

73

74

75



80
81


83

84

85

86




91


93

94

95

96
.750
.875
1.000
+.020
 
P.A.   WC

Other Cust   82

TITLE

SETSCREW - HEXAGON SOCKET, CUP POINT
CORROSION-RESISTING STEEL, PASSIVATED,
UNC-3A, PLAIN AND SELF-LOCKING

MILITARY STANDARD
MS51021
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES: MS51022 AND IN PART MS18064, BCTX1.2 AND BCUX5. SHEET 1 OF 2

 

FED. SUP CLASS
5305 
      

NOTES:

1. MATERIAL: Corrosion-Resisting Steel , 300 Series, in accordance with procurement specification.

2. PROTECTIVE COATING: Passivated in accordance with QQ-P-35.

3. THREADS: The threads shall be in accordance with MlL-S-7742.

4. MAGNETIC PERMEABILITY: These set screws have a magnetic permeability of 2.0 max (air = 1.0)
for a field strength of H = 200 oersteds, when using a magnetic indicator per MIL-I-17214.

5. DIMENSIONS: All dimensions are in inches, unless otherwise specified.

6. TOLERANCES: Angles +5 degrees, unless otherwise specified.

7. PART NUMBER: The MS part number consists of the MS number, plus the dash number.

Example: M551023-1.

8. SELF-LOCKING ELEMENT:

(a) The self-locking element shall be in accordance with MIL-F-18240.

(b) For design and usage limitations, see MS15981.

(c) Location of effective locking area shall be in accordance with MS15981.

(d) Maximum ring gage diameter that locking region of setscrew must pass thru freely or with
finger pressure shall be the nominal size plus 0.010.

(e) MIL-F-18240 doesn't establish torque requirements for lengths above the dashed line.
Only a positive indication of torque is required.

9. Referenced documents shall be of the issue in effect on date of invitations for bid.

10. For design feature purposes, this standard takes precedence over procurement documents 
referenced herin.

 

INTERCHANGEABILITY


Screws covered by the dash numbers given in MS51024 are cancelled after 29 January 1964 and superseded by the screws covered on MS51023 having the same dash numbers. Cancelled screws may be used
until existing stocks are depleted. Use only MS51023 screws for new design.


Screws covered by the dash numbers given in MS18064 in part are cancelled.
Cancelled screws may be used until existing stocks are depleted. Use only the superseding screws
for new design. Replacement shall be in accordance with Table II.

 

TABLE II

CANCELLED

SUPERSEDING

CANCELLED

SUPERSEDING

CANCELLED

SUPERSEDING

CANCELLED

SUPERSEDING

MS18064

MS51023

MS18064

MS51023

MS18064

MS51023

MS18064

MS51023

DASH NUMBER

DASH NUMBER

DASH NUMBER

DASH NUMBER

4
8
13
19
25
31
36
44
49
56

68
9
14
20
26

101
102
103
104
105
106
107
108
109
110

111
112
113
114
115

32
37
45
50
57
63
69
73
77
15

21
27
38
51
58
116
117
118
119
120
121
122
123
124
125

126
127
128
129
130 
64
70
74
78
81
84
91
39
52
59

65
71
75
79
131
132
133
134
135
136
137
138
139
140

141
142
143
144
82
85
92
40
53
60
66
72
76
80

83
86
87
88

P.A.                   WC

Other Cust

82

TITLE

SETSCREW

MILITARY STANDARD

MS51021

PROCUREMENT SPECIFICATION
FF-S-200

SUPERSEDES:  MS51022 and in part MS18064, BCTX1.2 and BCUX5.

SHEET     2   of    2

 

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