Jam Nut Socket Tooling Guide
Page 1 of 4
Jam Nut Sockets
The correct application of torque is essential to most connector applications
where Jam Nut receptacle connectors are used. The sealing components (usually
an "O" ring) must be compressed, but not to the point of damage. Another
consideration when tightening Jam Nuts is the thread strength. This is extremely
important in the various types of aluminum and composite connectors.
DMC Jam Nut Socket tools have been developed specially for the installation of
Jam Nut receptacle connectors. They are available in a versatile composite
construction which is an excellent choice for OEM assembly areas due to their light weight, and the non-marking
surfaces, a durable machined aluminum series and the traditional "General Purpose" formed steel socket for non-torque
specific applications.
COMPOSITE JAM NUT SOCKETS
A unique process was developed to mold this composite material which contains a higher percentage of fiber
glass than is customarily used in conventional molding technology. This makes them as light and a s strong as
possible. The material will not scratch plating, or damage the finish on cabinets, panels or bulkheads when
properly used.
ALUMINUM JAM NUT SOCKETS
When a metal socket is required, the anodized aluminum series jam nut sockets are a good choice. They are
machined to the same configuration as the composite jam nut sockets with the square hold drive for
torqueing.
STEEL JAM NUT SOCKETS
Also available are formed Steel Jam Nut sockets. These are plated for corrosion resistance, and have drive
holes to accommodate a metal rod, or similar, drive tool.
Jam Nut Sockets are ideal for torqueing jam nuts on panels where several connectors are crowded together
and in other tight spaces.
We also recommend that you consider DMC Safe-T-Cable™ to secure Jam Nut receptacles where lock wire holes are
provided.
Jam Nut Socket Tooling Guide
Page 2 of 4
TYPICAL JAM NUT SOCKET PART NUMBER BREAKDOWN
BT - J -
XXX
XX
X
Basic P/N Size Designator
(see chart below)
Material:
Blank = Composite
AL = Aluminum
S = Steel
Special Configuration:
Blank = Standard
1Thru X = Non-Standard
To find the correct jam nut socket for your application, measure across the flats of the jam nut you are working with.
Next, find the size range in the lower table. Listed beside it will be the socket you need.
COMPOSITE OR METAL JAM NUT SOCKETS
DMC Part Number Fits Jam Nut Size: Inches Fits Jam Nut Size: Millimeters Square Drive
Outside
Diameter Reference
BT-J-117
.608 to .628
15.41 to 15.95
1/4
.914
BT-J-118*
.628 to .649
15.95 to 16.48
1/4
.955
BT-J-120
.671 to .693
17.04 to 17.60
1/4
.010
BT-J-121
.693 to .717
17.60 to 18.21
1/4
1.04
BT-J-122
.717 to .741
18.21 to 18.82
1/4
1.07
BT-J-123
.741 to .765
18.82 to 19.43
1/4
1.10
BT-J-124
.765 to .791
19.43 to 20.09
1/4
1.13
BT-J-125
.791 to .818
20.09 to 20.77
1/4
1.16
BT-J-126
.818 to .845
20.77 to 21.46
1/4
1.19
BT-J-127
.845 to .873
21.46 to 22.17
1/4
1.22
BT-J-128
.873 to .902
22.17 to 22.91
1/4
1.26
BT-J-129
.902 to .933
22.91 to 23.69
1/4
1.29
BT-J-130
.933 to .964
23.69 to 24.48
3/8
1.33
BT-J-131
.964 to .996
24.48 to 25.29
3/8
1.36
BT-J-132
.996 to 1.030
25.29 to 26.16
3/8
1.41
BT-J-133
1.030 to 1.064
26.16 to 27.02
3/8
1.45
BT-J-134
1.064 to 1.100
27.02 to 27.94
3/8
1.51
BT-J-135
1.100 to 1.137
27.94 to 28.87
3/8
1.55
BT-J-136
1.137 to 1.175
28.87 to 29.84
3/8
1.59
BT-J-137
1.175 to 1.214
29.84 to 30.83
3/8
1.63
BT-J-138
1.214 to 1.255
30.83 to 31.87
3/8
1.69
BT-J-139
1.255 to 1.297
31.87 to 32.94
3/8
1.73
BT-J-140
1.297 to 1.340
32.94 to 34.03
3/8
1.78
BT-J-141
1.340 to 1.385
34.03 to 35.17
3/8
1.84
BT-J-142
1.385 to 1.432
35.17 to 36.37
3/8
1.89
BT-J-143
1.432 to 1.480
36.37 to 37.59
3/8
1.95
BT-J-144
1.480 to 1.529
37.59 to 38.83
3/8
2.00
BT-J-145
1.529 to 1.580
38.83 to 40.13
3/8
2.06
BT-J-146
1.580 to 1.633
40.13 to 41.47
3/8
2.12
Jam Nut Socket Tooling Guide
Page 3 of 4
COMPOSITE OR METAL JAM NUT SOCKETS
DMC Part Number Fits Jam Nut Size: Inches Fits Jam Nut Size: Millimeters Square Drive
Outside
Diameter Reference
BT-J-147
1.633 to 1.688
41.47 to 42.87
3/8
2.19
BT-J-148
1.688 to 1.745
42.87 to 44.32
3/8
2.25
BT-J-149
1.745 to 1.803
44.32 to 45.79
3/8
2.32
BT-J-150
1.803 to 1.864
45.79 to 47.34
3/8
2.39
BT-J-151
1.864 to 1.926
47.34 to 48.92
3/8
2.46
BT-J-152
1.926 to 1.991
48.92 to 50.57
3/8
2.54
BT-J-153
1.991 to 2.057
50.57 to 52.24
3/8
2.61
BT-J-154
2.057 to 2.126
52.24 to 54.00
3/8
2.69
BT-J-155
2.126 to 2.197
54.00 to 55.80
3/8
2.78
BT-J-156
2.197 to 2.271
55.80 to 57.68
3/8
2.87
BT-J-157
2.271 to 2.347
57.68 to 59.61
3/8
2.95
BT-J-158
2.347 to 2.426
59.61 to 61.62
3/8
3.04
BT-J-159*
2.426 to 2.507
61.62 to 63.67
3/8
3.14
BT-J-160*
2.507 to 2.591
63.67 to 65.81
3/8
3.24
BT-J-161
2.591 to 2.678
65.81 to 68.02
3/8
3.34
BT-J-162
2.678 to 2.769
68.02 to 70.33
3/8
3.44
BT-J-163
2.769 to 2.860
70.33 to 72.64
3/8
3.54
BT-J-164
2.860 to 2.956
72.64 to 75.08
3/8
3.66
BT-J-165
2.956 to 3.055
75.08 to 77.59
3/8
3.77
BT-J-166
3.055 to 3.157
77.59 to 80.18
3/8
3.89
BT-J-170*
3.457 to 3.557
87.81 to 90.35
3/8
4.38
* Not available in composite material
GENERAL PURPOSE JAM NUT SOCKETS
Formed Stainless Steel Jam Nut sockets are great for non-torque specific jam nut applications. They
are plated for corrosion resistance, and have drive holes to accommodate a metal rod drive tool (P/N
DW75).
GENERAL PURPOSE JAM NUT SOCKETS
DMC Part Number
Fits Jam Nut
Size: Inches
Amphenol BCO
Part Number
Hex Ref.
Dim: Inches
Equivalent
Composite
CS8
.755 to .763
11-6266-3
3/4"
N/A
CS10
.880 to .888
11-6266-5
7/8"
BT-J-128
CS12
1.068 to 1.077
11-6266-8
1 1/16"
BT-J-134
CS14
1.194 to 1.204
11-6266-10
1 3/16"
BT-J-137
CS16
1.320 to 1.331
11-6266-12
1 5/16"
BT-J-140
CS18
1.446 to 1.457
11-6266-14
1 7/16"
BT-J-143
CS20
1.571 to 1.580
11-6266-16
1 9/16"
BT-J-145
Jam Nut Socket Tooling Guide
Page 4 of 4
GENERAL PURPOSE JAM NUT SOCKETS
DMC Part Number
Fits Jam Nut
Size: Inches
Amphenol BCO
Part Number
Hex Ref.
Dim: Inches
Equivalent
Composite
CS22
1.696 to 1.708
11-6266-18
1 11/16"
BT-J-148
CS24
1.822 to 1.835
11-6266-20
1 13/16"
BT-J-150
CS22-1
2.011 to 2.025
11-6266-23
2"
BT-J-153
CS24-1
2.137 to 2.151
11-6266-25
2 1/8"
BT-J-155
CS32
2.640 to 2.687
11-6266-33
2 5/8"
BT-J-161 & BT-J-162
DMC1554
Set Includes All 12 Sockets Listed Above And DW75 Drive Rod.
ADJUSTABLE JAM NUT WRENCH
The JR700 adjustable jam nut wrench is a versatile tool for maintenance and low volume
production. The rugged all steel construction makes this tool a good choice for heavy-duty
applications.
The tool may be adjusted to accommodate hex nuts from .75 inch to 3.25 inch (across flat)
dimensions. The maximum working depth is 1.0 inch. This range accommodates most
common connectors.
A standard 3/8 inch drive torque tool may be used in conjunction with this tool to limit the possibility of overtightening.
If torque values require close tolerance accuracy, direct reading sockets are recommended.
TORQUE CONVERSION CHART
FOR JR700 TOOL USED WITH BT-ST-300D
Diameter of
Part Being
Tightened
DESIRED TORQUE VALUE (in-lbs)
40 60 80 100 120 140 160 180 200
0.50"
22
33
45
56
67
78
89
100
111
0.75"
23
34
45
56
68
79
90
101
113
1.00"
23
34
45
57
68
80
91
102
114
1.50"
23
35
47
58
70
82
93
105
116
1.75"
24
35
47
59
71
83
94
106
118
2.00"
24
36
48
60
72
84
95
107
119
2.25"
24
36
48
60
73
85
97
109
121
2.50"
24
37
49
61
73
86
98
110
122
2.75"
25
37
50
62
74
87
99
111
124
3.00"
25
38
50
63
75
88
100
113
125
3.25"
25
38
51
63
76
89
101
114
127
