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Heyco Liquid Tight Fittings Locknuts
National Pipe ThreadNPT
Panzerrohr GewindePG
Metric ThreadMetric
SteelSteel
Zinc Die-CastZinc Die-cast
Nickel-Plated BrassNickel-Plated Brass
 
Thread Material
Type Size Nylon Steel Zinc Die-Cast Nickel-Plated Brass
Black Gray
PG PG 7   3165 3166 – – 2257
PG 9   3167 3168 – – 2258
PG 11 3169 3170 – – 2259
PG 13 3171 3172 – – 2260
PG 16 3173 3174 – – 2261
PG 21 3175 3176 – – 2262
PG 29 3177 3178 – – 2263
PG 36 M9146 M9147 – – 2268
PG 42 M9152 M9153 – – 2269
PG 48 M9158 M9159 – – –
NPT 1/4 NPT M9142 M9143 – – –
3/8 NPT 8461 8462 – – –
1/2 NPT 8463 8464 2250 9800 –
3/4 NPT 8465 8466 2251 9801 –
1 NPT 8467 8468 2252 9802 –
1-1/4 NPT M9144 M9145 9806 9803 –
1-1/2 NPT M9150 M9151 9807 9804 –
2 NPT M9156 M9157 9808 9805 –
Metric M6   – – – – 2243
M8   – – – – 2244
M10 – – – – 2245
M12 M9130 M9131 – – 2246
M16 M9132 M9133 – – 2247
M20 M9134 M9135 – – 2248
M25 M9136 M9137 – – 2249
M32 M9138 M9139 – – 2253
M40 M9140 M9141 – – 2254
M50 M9148 M9149 – – 2255
M63 M9154 M9155 – – –
 
National Pipe ThreadNPT
Panzerrohr GewindePG
Metric ThreadMetric

Material: 6/6 Nylon

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
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 2.75 69,9
2" NPT M9156 M9157 NLN 2 NPT .375 9,5 2.85 72,4
PG Threads
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 2.850 72,4
Metric Threads
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 .278 7,1 1.378 35,0
M32 M9138 M9139 NLN M32 .281 7,1 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 Locknuts
Straight NPS Threads for use with NPT Threaded Fittings
Trade Size Stamped Steel Zinc Die-Cast
Part Number Description Part Number Description
1/2" NPT 2250 LN 1/2 9800 LN 1/2 DC
3/4" NPT 2251 LN 3/4 9801 LN 3/4 DC
1" NPT 2252 LN 1 9802 LN 1 DC
1-1/4" NPT 9806 LN 1-1/4 9803 LN 1-1/4 DC
1-1/2" NPT 9807 LN 1-1/2 9804 LN 1-1/2 DC
2" NPT 9808 LN 2 9805 LN 2 DC
 
Steel Steel
Zinc Die-Cast Zinc Die-Cast
 
Heyco® Metal Locknuts
PG Threads - Nickel Plated Brass
Thread Size Part
Number		 Description Part Dimensions
A
Thickness		 B
Wrenching Flats
in. mm. in. mm.
PG 7 2257 Brass LN PG 7 .110 2,8   .591 15,0
PG 9 2258 Brass LN PG 9   .709 18,0
PG 11 2259 Brass LN PG 11 .118 3,0   .827 21,0
PG 13.5 2260 Brass LN PG 13.5   .906 23,0
PG 16 2261 Brass LN PG 16 1.024 26,0
PG 21 2262 Brass LN PG 21 .138 3,5 1.261 32,0
PG 29 2263 Brass LN PG 29 .158 4,0 1.615 41,0
PG 36 2268 Brass LN PG 36 .197 5,0 2.009 51,0
PG 42 2269 Brass LN PG 42 2.364 60,0
Nickel Plated Brass Nickel Plated Brass
 
Heyco® Metal Locknuts
Metric Threads - Nickel Plated Brass
Thread Size Part
Number		 Description Part Dimensions
A
Thickness		 B
Wrenching Flats
in. mm. in. mm.
M 6 x 1      2243 Brass LN M6   .110 2,8 .354 9,0
M 8 x 1,25 2244 Brass LN M8   .433 11,0
M 10 x 1,5 2245 Brass LN M10 .512 13,0
M 12 x 1,5 2246 Brass LN M12 .118 3,0 .591 15,0
M 16 x 1,5 2247 Brass LN M16 .748 19,0
M 20 x 1,5 2248 Brass LN M20 .138 3,5 .945 24,0
M 25 x 1,5 2249 Brass LN M25 1.181   30,0
M 32 x 1,5 2253 Brass LN M32 .177 4,5 1.417   36,0
M 40 x 1,5 2254 Brass LN M40 1.811   46,0
M 50 x 1,5 2255 Brass LN M50 .217 5,5 2.165   55,0
Nickel Plated Brass Nickel Plated Brass