MS51973/NASM51973


FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) 10 SEP 1969 (B) 29 DEC 1972

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
NOW .035 .050 .062 .078 .094 .125 .156 .188 .250


Y CONE POINT DIAMETER 118°+2° FOR LENGTHS UNDER
90°+2° FOR LENGTHS AND OVER
.109 .156 .188 .250 .250 .312 .375 .438 .562
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
8
9
10
11
101
102
103
104
105

106*
107
108*
109
17
18
19
20
21


22
111
112
113
114
115

116*
117
118*
119

28
29
30
31


32

33
131*
132
133
134
135

136*
137
138*
139


39
40
41


42

43


50
51
52


53

54



62
63


64

65




73


74

75







83

84
.750
.875
1.000
+.020 120
121
140
141
142
44 55

56
66

67
76

77
85

86
(B)
  • 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: MS51973_1
  6. SELF-LOCKING ELEMENT:


    (B)
    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.
(B) For changes see sheets 1 and 2.
P.A WC
Order Cust
AS
82
TITLE
SETSCREW - HEXAGON SOCKET, CONE POINT,
ALLOY STEEL, CADMIUM PLATED, UNC - 3A
PLAIN AND SELF - LOCKING          (B)
MILITARY STANDARD
MS 51973
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51035, MS51036, BCTX4.1 and in part MS51053, MS18067, BCTX2.6, BCTX2.7, BCTX2.5, BCTX2.12, BCTX4.3. SHEET       1       of       2
FED. SUP CLASS
5305

APPROVED 29 JAN 1964     REVISED (A) 10 SEP 1969 (B) FOR CHANGES SEE SHHET 1 AND 2.





INTERCHANGEABILITY

Screws covered by the dash numbers given in MS51035 and MS51036 are cancelled after 29 January 1964 and superseded by screws covered on MS51973 having same dash number. Cancelled screws may be used until existing stock are depleted. Use only the MS51973 screws for new design.

Screws covered by the dash numbers given in MS51053 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 MS51973 MS51053 MS51973 MS51053 MS51973 MS51053 MS51973
DASH NUMBER DASH NUMBER DASH NUMBER DASH NUMBER
301
302
303
304
305
311
312
**
1
2
**
**
**
8
313
314
315
316
317
318
319
9
10
11
**
**
**
**
320
326
327
328
329
330
**
17
18
19
20
21
331
332
333
334
335
336
**
22
**
**
**
**
** No Replacement




Screws covered by the dash numbers given in MS18067 in part 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         (B)
CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING CANCELLED SUSPERSENDING
MS18067 MS51973 MS18067 MS51973 MS18067 MS51973 MS18067 MS51973
DASH NUMBER DASH NUMBER DASH NUMBER DASH NUMBER
1
5
10
16
22
89
33
41
101
102
103
104
105
106
107
108
46
2
6
11
17
23
90
34
109
111
112
113
114
115
116
117
42
47
54
61
3
7
12
18
118
119
120
121
131
132
133
134
24
30
35
43
48
55
62
67
135
136
137
138
139
140
141
142
P.A WC
Order Cust
AS
82
TITLE
SETSCREW - HEXAGON SOCKET, CONE POINT,
ALLOY STEEL, CADMIUM PLATED, UNC - 3A
PLAIN AND SELF - LOCKING          (B)
MILITARY STANDARD
MS 51973
PROCUREMENT SPECIFICATION
FF-S-200
SUPERSEDES MS51035, MS51036, BCTX4.1 and in part MS51053, MS18067, BCTX2.6, BCTX2.7, BCTX2.5, BCTX2.12, BCTX4.3. SHEET       2       of       2

Request for Quote

Fill Out the Form