MS51031/NASM51031


 

FED. SUP CLASS
5305

MS51031 per NASM51031 Flat Point, Stainless, Socket Set Screw

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 NOM
.028 .035 .050 .062 .078 .094 .125 .156 .188 .250
C  POINT                     MAX
    DIAMETER              MIN
.033
.027
.047
.039
.061
.051
.074
.064
.087
.076
.102
.088
.132
.118
.172
.156
.212
1.94
.291
.270

L LENGTH

TOL

DASH NUMBER
PLAIN PLAIN PLAIN PLAIN PLAIN PLAIN SELF-
LOCK
PLAIN SELF-
LOCK
PLAIN SELF-
LOCK
PLAIN SELF-
LOCK
PLAIN SELF-
LOCK

.062
.125
.188
.250
.312

.375
.438
.500
.562
.625

+.010 1* 7*
8*
9*
15*
16*
17*
23*
24*
25*
26*
27*

33*
34*
35*
36*

37*

38*

39*


40*


46
47
48

49

50

51


52

 


101*
102
103
104

105*
106*
107
108*
109


110

111



58*
59*

60*

61*

62*


63*

 



112
113
114

115
116*
117
118*
119


120
121
122



69*
70*

71*

72*

73*


74*

 




125
126

127

128

129


130
131
132




80*

81
*
82*

83*


84*






137

138

139


140
141
142






90*

91*

92*


93*







147

148

149


150
151
152
153

.750
.875
1.000

+.020
 *Inactive for new design after 29 DEC 1972.

 

P.A.   WC

Other Cust   82

TITLE

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

MILITARY STANDARD
MS51031
PER NAS51031
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES: MS51032, MS51056, MS51057 AND IN PART MS18066,
BCTX2.13, BCUX1, BCUX3 AND BCUX4.5
SHEET 1 OF 2

 

FED. SUP CLASS
5305

MS51031 per NASM51031 Flat Point, Stainless, Socket Set Screw

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

Example: M551029-101.

7. 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.

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

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

 

INTERCHANGEABILITY


Screws covered by the dash numbers given in MS51032 are cancelled after 29 January 1964 and superseded by the screws covered on MS51031 having the same dash numbers. Cancelled screws may be used until existing stocks are depleted. Use only MS51031 screws for new design.

Effective 31 December 1960, MS51056 and MS51057 were cancelled and superseded by MS51031 and MS51032 respectively.


Screws covered by the dash numbers given in MS18066 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
MS18066 MS51031 MS18066 MS51031 MS18066 MS51031 MS18066 MS51031
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
145
146
147
148
149

150
151
152
153
154

155
156
157
158
 
P.A.                   WC

Other Cust

82

TITLE

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

MILITARY STANDARD
MS51031
PER NASM51031
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES: MS51032, MS51056, MS51057 AND IN PART MS18066, BCTX2.13, BCUX1, BCUX3 AND  BCUX4.5. SHEET 2 OF 2

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