3
4270 Series Electrically
Conductive Connector Covers
Technical Information
BT 0806-1101
Nov 2001
Conductive Composite
3M™ 4270 Series Connector Covers feature a
new unique Conductive Composite material. The
material is made intrinsically conductive by
uniformly distributing a conductive matrix of
fibers during compounding. The covers are
permanently volume conductive and free of
carbon black particulate. The 4270 Series
Covers do not leave black marks and are
more suited to clean situations.
Noncorrosive
4270 Series Connector Covers are
noncorrosive and produce no visible
corrosion when tested to Federal
Test Method 101C using Kovar test
plates.
Military Application
4270 Series Circular Connectors Covers were
designed to meet the requirements and intentions
of MS90376, and MIL PRF 5501/31A or 32A.
Prominent military contractors have qualified
these materials to their own specifications and are
encouraging their use.
Conformability
The material used in the covers were also selected
for its resilience. Properly sized, the covers
provide a snug, secure fit. This helps keep
connectors clean and prevents the cover from
accidentally falling off.
BT 0806-1101
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Material Properties
Property
Resistivity
Contact Corrosivity
Metod 3005
(Kovar plate)
Crayoning
Elongation
Tensile
Vicat Softening
Out Gassing
Test Method
ASTM D991
FTM 101C
Typical Value
<10
5
ohm-cm
Pass
Chemical Susceptibility
Chemical
Dilute Acids
Dilute Alkalines
Concentrated Acids
Concentrated Alkalines
Methanol, Ethanol, and
Isopropanol
Hydrocarbons
Ketones
Oil and Gasoline
Reactions
Slight Attack
Slight Attack
Severe Attack
Severe Attack
Resistant
Slight Attack
Dissolves
Severe Attack
3M
ASTM D638
ASTM D638
ASTM MD 1525
ASTM E595
Not visible
25%
1,03 N/cm
2
96° C
Pass
Model 4270 Circular Cover
3M Logo
Mil-129H
Symbol
“A”
“C” “D”
Model
Number
“B”
Dimensions in inches (in) : 1 in = 25,4 mm
Product Description
Packaged 100/bag; 10 bags/box
4270 M5501-31A-250
4270 M5501/31A-313
4270 M5501/31A-375
4270 M5501/31A-413
4270 M5501/31A-480
4270 M5501/31A-500
4270 M5501/31A-530
4270 M5501/31A-605
4270 M5501/31A-655
4270 M5501/31A-720
4270 M5501/31A-785
4270 M5501/31A-850
4270 M5501/31A-893
4270 M5501/31A-973
4270 M5501/31A-1028
4270 M5501/31A-1093
4270 M5501/31A-1125
Packaged 50/bag; 10 bags/box
4270 M5501/31A-1150
4270 M5501/31A-1231
4270 M5501/31A-1270
4270 M5501/31A-1340
4270 M5501/31A-1390
4270 M5501/31A-1463
4270 M5501/31A-1540
4270 M5501/31A-1645
4270 M5501/31A-1715
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Old Prod. Desc.
4270-4R
4270-5R
4270-6R
4270-8Y
4270-8R
4270-9R
4270-10Y
4270-10R
4270-12Y
4270-12R
4270-14Y
4270-14R
4270-16Y
4270-16R
4270-18Y
4270-18R
4270-19R
4270-20Y
4270-20R
4270-22Y
4270-22R
4270-24Y
4270-24R
4270-25Y
4270-28Y
4270-28R
“A”
.670
.670
.670
.670
.740
.750
.750
.840
.860
.970
1.031
1.125
1.125
1.220
1.250
1.330
1.400
1.406
1.465
1.500
1.590
1.640
1.700
1.810
1.875
1.950
“B”
.500
.500
.500
.625
.500
.500
.625
.500
.625
.500
.625
.500
.625
.500
.625
.562
.562
.625
.562
.625
.562
.625
.562
.625
.625
.562
“C”
.250
.313
.375
.413
.480
.500
.530
.605
.655
.720
.785
.850
.893
.973
1.28
1.093
1.125
1.150
1.231
1.270
1.340
1.390
1.463
1.540
1.645
1.715
“D”
.336
.399
.461
.483
.540
.586
.595
.665
.715
.755
.845
.905
.963
1.035
1.088
1.155
1.213
1.215
1.301
1.340
1.410
1.460
1.533
1.580
1.718
1.790
BT 0806-1101
Model 4270 Circular Cover (continued)
Dimensions in inches (in) : 1 in = 25,4 mm
Product Description
Packaged 25/bag; 10 bags/box
4270 M5501/31A-1890
4270 M5501/31A-1965
4270 M5501/31A-2140
4270 M5501/31A-2215
4270 M5501/31A-2380
4270 M5501/31A-2440
4270 M5501/31A-2630
4270 M5501/31A-2720
4270 M5501/31A-2880
4270 M5501/31A-2960
Old Prod. Desc.
4270-32Y
4270-32R
4270-36Y
4270-36R
4270-40Y
4270-40R
4270-44Y
4270-44R
4270-48Y
4270-48R
“A”
2.125
2.220
2.340
2.435
2.600
2.660
2.875
2.960
3.125
3.225
“B”
.625
.562
.625
.600
.625
.600
.625
.600
.625
.600
“C”
1.890
1.965
2.140
2.215
2.380
2.440
2.630
2.720
2.880
2.960
“D”
1.970
2.040
2.210
2.290
2.450
2.530
2.700
2.812
2.950
3.050
Model 4272 “D” Type Cover
Dimensions in inches (in) : 1 in = 25,4 mm
Product Description
Old Prod. Desc. “A”
“B”
“C”
2.279
2.216
2.383
2.310
1.735
1.662
1.177
1.122
.849
.794
“D”
.636
.574
.530
.462
.530
.462
.512
.462
.512
.462
“E”
.536
.474
.430
.362
.430
.362
.436
.362
.434
.362
“F”
.469
.407
.363
.295
.363
.295
.369
.295
.367
.295
“G”
.280
.280
.280
.280
.280
.280
.280
.280
.280
.280
“H”
.240
.240
.240
.240
.240
.240
.240
.240
.240
.240
Nominal Dimensions Packaged 100/bag; 10 bags/box
4272 M5501/32A-50P 4272-50P
2.112
2.179
4272 M5501/32A-50S 4272-50S
2.049
2.116
4272 M5501/32A-37P 4272-37P
2.216
2.283
4272 M5501/32A-37S 4272-37S
2.143
2.210
4272 M5501/32A-25P 4272-25P
1.586
1.635
4272 M5501/32A-25S 4272-25S
1.495
1.562
4272 M5501/32A-15P 4272-15P
1.040
1.107
4272 M5501/32A-15S 4272-15S
.955
1.022
4272 M5501/32A-9P
4272-9P
.708
.775
4272 M5501/32A-9S
4272-9S
.627
.694
BT 0806-1101
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3
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Electronic Handling &
Protection
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95006 Cergy Pontoise Cedex
Tél. : + 33 (0) 1 30 31 68 09
Fax : + 33 (0) 1 30 31 61 81
SAS au capital de 8 400 000 euros -
542 078 555 RCS Pontoise APE 246C -
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CCP n° 30041 00001 0143470B020 03 Paris
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Fax : + 46 (0) 155 26 98 34
BT 0806-1101
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