Heyco Conduit, Tubing & Fittings Locknuts
National Pipe ThreadNPT
Panzerrohr GewindePG
Metric ThreadMetric

Material: Nylon 6/6

Flammability Rating: 94V-2

Material Temperature Index: 125°C (257°F)
Max. temperature on part not to exceed 105°C (221°F)

 
Heyco® Nylon Locknuts
Thread Type
and Size		 Part Number Description Part Dimensions Diagram
Color A
Thickness		 B
Wrenching Flats
Black Gray in. mm. in. mm.
NPT Threads – Straight NPS Threads for use with NPT Threaded Fittings
1/4" NPT M9142 M9143 NLN 1/4 NPT .265 6,7   .748 19,0
3/8" NPT 8461 8462 NLN 3/8 NPT 1.058 26,9
1/2" NPT 8463 8464 NLN 1/2 NPT
3/4" NPT 8465 8466 NLN 3/4 NPT 1.295 32,9
1" NPT 8467 8468 NLN 1 NPT 1.605 40,8
1-1/4" NPT M9144 M9145 NLN 1-1/4 NPT .281 7,1 1.968 50,0
1-1/2" NPT M9150 M9151 NLN 1-1/2 NPT .320 8,1 2.750 69,9
2" NPT M9156 M9157 NLN 2 NPT .375 9,5 2.835 72,0
PG Thread
PG 7   3165 3166 NLN PG 7 .218 5,5   .750 19,1
PG 9   3167 3168 NLN PG 9   .859 21,8
PG 11 3169 3170 NLN PG 11   .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 1.171 29,7
PG 21 3175 3176 NLN PG 21 .281 7,1 1.406 35,7
PG 29 3177 3178 NLN PG 29 1.812 46,0
PG 36 M9146 M9147 NLN PG 36 2.244 56,9
PG 42 M9152 M9153 NLN PG 42 .320 8,1 2.750 69,9
PG 48 M9158 M9159 NLN PG 48 .375 9,5 2.835 72,0
Metric Thread
M12 M9130 M9131 NLN M12 .218 5,5   .750 19,1
M16 M9132 M9133 NLN M16   .870 22,1
M20 M9134 M9135 NLN M20 .245 6,2 1.062 27,0
M25 M9136 M9137 NLN M25 .281 7,1 1.378 35,0
M32 M9138 M9139 NLN M32 1.614 41,0
M40 M9140 M9141 NLN M40 1.968 50,0
M50 M9148 M9149 NLN M50 .320 8,1 2.750 69,9
M63 M9154 M9155 NLN M63 .375 9,5 2.850 72,4
 
Heyco® Metal Locknuts - NPT Thread
Trade Size Stamped Steel
Part Number Description
1/4" NPT 2238 LN 1/4 *
3/8" NPT 2242 LN 3/8 *
1/2" NPT 2250 LN 1/2
3/4" NPT 2251 LN 3/4
1" NPT 2252 LN 1
1-1/4" NPT 9806 LN 1-1/4
1-1/2" NPT 9807 LN 1-1/2
2" NPT 9808 LN 2
  ASD
* Wrenching flats are not crenellated.
Steel Steel