1 / 4
BT 0806-1101
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.
2 / 4 BT 0806-1101
3M Logo
Mil-129H
Symbol
Model
Number
“A”
“B”
“C” “D”
Model 4270 Circular Cover
Dimensions in inches (in) : 1 in = 25,4 mm
Product Description Old Prod. Desc. “A” “B” “C” “D”
Packaged 100/bag; 10 bags/box
4270 M5501-31A-250 4270-4R .670 .500 .250 .336
4270 M5501/31A-313 4270-5R .670 .500 .313 .399
4270 M5501/31A-375 4270-6R .670 .500 .375 .461
4270 M5501/31A-413 4270-8Y .670 .625 .413 .483
4270 M5501/31A-480 4270-8R .740 .500 .480 .540
4270 M5501/31A-500 4270-9R .750 .500 .500 .586
4270 M5501/31A-530 4270-10Y .750 .625 .530 .595
4270 M5501/31A-605 4270-10R .840 .500 .605 .665
4270 M5501/31A-655 4270-12Y .860 .625 .655 .715
4270 M5501/31A-720 4270-12R .970 .500 .720 .755
4270 M5501/31A-785 4270-14Y 1.031 .625 .785 .845
4270 M5501/31A-850 4270-14R 1.125 .500 .850 .905
4270 M5501/31A-893 4270-16Y 1.125 .625 .893 .963
4270 M5501/31A-973 4270-16R 1.220 .500 .973 1.035
4270 M5501/31A-1028 4270-18Y 1.250 .625 1.28 1.088
4270 M5501/31A-1093 4270-18R 1.330 .562 1.093 1.155
4270 M5501/31A-1125 4270-19R 1.400 .562 1.125 1.213
Packaged 50/bag; 10 bags/box
4270 M5501/31A-1150 4270-20Y 1.406 .625 1.150 1.215
4270 M5501/31A-1231 4270-20R 1.465 .562 1.231 1.301
4270 M5501/31A-1270 4270-22Y 1.500 .625 1.270 1.340
4270 M5501/31A-1340 4270-22R 1.590 .562 1.340 1.410
4270 M5501/31A-1390 4270-24Y 1.640 .625 1.390 1.460
4270 M5501/31A-1463 4270-24R 1.700 .562 1.463 1.533
4270 M5501/31A-1540 4270-25Y 1.810 .625 1.540 1.580
4270 M5501/31A-1645 4270-28Y 1.875 .625 1.645 1.718
4270 M5501/31A-1715 4270-28R 1.950 .562 1.715 1.790
Material Properties
Property Test Method Typical Value
Resistivity ASTM D991 <105 ohm-cm
Contact Corrosivity FTM 101C Pass
Metod 3005
(Kovar plate)
Crayoning 3M Not visible
Elongation ASTM D638 25%
Tensile ASTM D638 1,03 N/cm2
Vicat Softening ASTM MD 1525 96° C
Out Gassing ASTM E595 Pass
Chemical Susceptibility
Chemical Reactions
Dilute Acids Slight Attack
Dilute Alkalines Slight Attack
Concentrated Acids Severe Attack
Concentrated Alkalines Severe Attack
Methanol, Ethanol, and
Isopropanol Resistant
Hydrocarbons Slight Attack
Ketones Dissolves
Oil and Gasoline Severe Attack
3 / 4
BT 0806-1101
Model 4270 Circular Cover (continued)
Dimensions in inches (in) : 1 in = 25,4 mm
Product Description Old Prod. Desc. “A” “B” “C” “D”
Packaged 25/bag; 10 bags/box
4270 M5501/31A-1890 4270-32Y 2.125 .625 1.890 1.970
4270 M5501/31A-1965 4270-32R 2.220 .562 1.965 2.040
4270 M5501/31A-2140 4270-36Y 2.340 .625 2.140 2.210
4270 M5501/31A-2215 4270-36R 2.435 .600 2.215 2.290
4270 M5501/31A-2380 4270-40Y 2.600 .625 2.380 2.450
4270 M5501/31A-2440 4270-40R 2.660 .600 2.440 2.530
4270 M5501/31A-2630 4270-44Y 2.875 .625 2.630 2.700
4270 M5501/31A-2720 4270-44R 2.960 .600 2.720 2.812
4270 M5501/31A-2880 4270-48Y 3.125 .625 2.880 2.950
4270 M5501/31A-2960 4270-48R 3.225 .600 2.960 3.050
Model 4272 “D” Type Cover
Dimensions in inches (in) : 1 in = 25,4 mm
Product Description Old Prod. Desc. “A” “B” “C” “D” “E” “F” “G” “H”
Nominal Dimensions Packaged 100/bag; 10 bags/box
4272 M5501/32A-50P 4272-50P 2.112 2.179 2.279 .636 .536 .469 .280 .240
4272 M5501/32A-50S 4272-50S 2.049 2.116 2.216 .574 .474 .407 .280 .240
4272 M5501/32A-37P 4272-37P 2.216 2.283 2.383 .530 .430 .363 .280 .240
4272 M5501/32A-37S 4272-37S 2.143 2.210 2.310 .462 .362 .295 .280 .240
4272 M5501/32A-25P 4272-25P 1.586 1.635 1.735 .530 .430 .363 .280 .240
4272 M5501/32A-25S 4272-25S 1.495 1.562 1.662 .462 .362 .295 .280 .240
4272 M5501/32A-15P 4272-15P 1.040 1.107 1.177 .512 .436 .369 .280 .240
4272 M5501/32A-15S 4272-15S .955 1.022 1.122 .462 .362 .295 .280 .240
4272 M5501/32A-9P 4272-9P .708 .775 .849 .512 .434 .367 .280 .240
4272 M5501/32A-9S 4272-9S .627 .694 .794 .462 .362 .295 .280 .240
4 / 4 BT 0806-1101
Distributed by:
SJM Eurostat UK Ltd.
Countess Avenue
Stanley Green Trading Estate
Cheadle Hulme,
Cheshire SK8 6QS
United Kingdom
Tel : + 44 (0) 161 485 5002
Fax : + 44 (0) 161 485 4678
3M France
Electronic Handling &
Protection
Boulevard de l’Oise
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 -
n°Identification TVA : FR 25 542 078 555 -
CCP n° 30041 00001 0143470B020 03 Paris
3
Magnab Eurostat
Skvasta Industriby 16BN
61192 Nyköping
Sweden
Tel : + 46 (0) 155 20 26 80
Fax : + 46 (0) 155 26 98 34
SJM Eurostat
45 route d'Orgelet
39130 Pont de Poitte
France
Tel : + 33 (0) 3 84 87 02 39
Fax : + 33 (0) 3 84 48 30 00