Heyco Sealing Washers
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                                                                           Part Dimensions
Will Fit These Electrical
Sizes-NPT		 Part No. UL/CSA
Description		 A
Inside
Diameter
in.            mm.		 B
Outside
Diameter
in.              mm.		 E
Thickness

in.          mm.
1/4 3258 SW 1/4 .540        13,7 .796           20,2 .125        3,2
1/2 3260 SW 1/2 .840        21,3 1.203         30,6 .125        3,2
3/4 3261 SW 3/4 1.030      26,7 1.500         38,1 .135        3,4
1 3262 SW 1 1.315      33,4 1.750         44,4 .135        3,4

Standard Color: Black.

  • For use with most electrical fittings.
  • Liquid tight, dust tight and oil tight at enclosure.
  • Suitable for wet locations requiring a separate gasket between the box and fitting.
  • Also suitable for other panel or chassis sealing applications.
  • Easy to install since washers seal off on the perimeter, not on the connector threads.
  • Special double sealing ridges compensate for minor uneveness at enclosure.
  • Molded of Sanoprene 251-80; flammability classification 94V-0.

    LN- Metal Locknuts
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    Heyco Nylon Locknuts
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  • For Metal NPT Locknuts, see page 7-5.
  • For DIN 40430 thread specifications, see page 1-20.
  • Molded of type 6/6 nylon. ASTM d-4066-82; flammability classification 94V-2; temperature index 125°C.
 National Pipe Threads                                  Part No.                                                   Part Dimensions
Thread Type
and Size		 Black Gray Description G
Thickness

in.          mm.		 H
Wrenching Flats
in.        mm.
3/8 NPT 8461 8462 NLN 3/3 NPT .265        6,7 1.058     26,9
1/2 NPT 8463 8464 NLN 1/2 NPT .265        6,7 1.058     26,9
3/4 NPT 8465 8466 NLN 3/4 NPT .265        6,7 1.312     33,3
1 NPT 8467 8468 NLN 1 NPT .265        6,7 1.605     40,7
 "PG" means Steel Conduit                               Part No.                                                   Part Dimensions
   Threads per DIN 40430
Thread Type
and Size		 Black Gray Description G
Thickness

in.             mm.		 H
Wrenching Flats
in.                mm.
PG 7 3165 3166 NLN PG 7 .218           5,6 .750               19,0
PG 9 3167 3168 NLN PG 9 .218            5,6 .859               21,8
PG 11 3169 3170 NLN PG 11 .218           5,6 .937               23,8
PG 13.5 3171 3172 NLN PG 13,5 .250           6,4 1.062             27,0
PG 16 3173 3174 NLN PG 16 .250           6,4 1.171             29,8
PG 21 3175 3176 NLN PG 21 .281           7,1 1.406             35,7
PG 29 3177 3178 NLN PG 29 .281           7,1 1.812             46,0

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