Heyco Liquid Tight Cord Grips Locknuts
National Pipe ThreadNPT
Panzerrohr GewindePG
Metric ThreadMetric
SteelSteel
Zinc Die-CastZinc Die-cast
Nickel-Plated BrassNickel-Plated
Brass
EMC Nickel-Plated BrassNickel-Plated
Brass (EMC)
 
Thread Material
Type Size Nylon Steel Zinc Die-Cast Nickel-Plated Brass Nickel-Plated Brass (EMC)
Black Gray
NPT 1/4 NPT M9142 M9143 2238 – – –
3/8 NPT 8461 8462 2242 – – –
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 – –
2-1/2 NPT – – 9809 – – –
3 NPT – – 9810 – – –
PG PG 7   3165 3166 – – 2257 4671
PG 9   3167 3168 – – 2258 4672
PG 11 3169 3170 – – 2259 4673
PG 13 3171 3172 – – 2260 4674
PG 16 3173 3174 – – 2261 4675
PG 21 3175 3176 – – 2262 4676
PG 29 3177 3178 – – 2263 4677
PG 36 M9146 M9147 – – 2268 –
PG 42 M9152 M9153 – – 2269 –
PG 48 M9158 M9159 – – – –
Metric M6   – – – – 2243 –
M8   – – – – 2244 4681
M10 – – – – 2245 4682
M12 M9130 M9131 – – 2246 4683
M16 M9132 M9133 – – 2247 4684
M20 M9134 M9135 – – 2248 4685
M25 M9136 M9137 – – 2249 4686
M32 M9138 M9139 – – 2253 4687
M40 M9140 M9141 – – 2254 –
M50 M9148 M9149 – – 2255 –
M63 M9154 M9155 – – – –
 
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 Thread – 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 Locknuts
Straight NPS Threads for use with NPT Threaded Fittings
Trade Size Stamped Steel Zinc Die-Cast
Part Number Description Part Number Description
1/4" NPT 2238 LN 1/4 * – –
3/8" NPT 2242 LN 3/8 * – –
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
2-1/2" NPT 9809 LN 2-1/2 – –
3" NPT 9810 LN 3 – –
 
* Wrenching flats are not crenellated.
Steel Steel
Zinc Die-Cast Zinc Die-Cast
 
Heyco® Metal Locknuts
Nickel-Plated Brass
Thread Size Part
Number		 Description Part Dimensions
A
Thickness		 B
Wrenching Flats
in. mm. in. mm.
PG Threads
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
Metric Threads
M6 x 1 2243 Brass LN M6 .110 2,8   .354   9,0
M8 x 1,25 2244 Brass LN M8   .433 11,0
M10 x 1,5 2245 Brass LN M10   .512 13,0
M12 x 1,5 2246 Brass LN M12 .118 3,0   .591 15,0
M16 x 1,5 2247 Brass LN M16   .748 19,0
M20 x 1,5 2248 Brass LN M20 .138 3,5   .945 24,0
M25 x 1,5 2249 Brass LN M25 1.181 30,0
M32 x 1,5 2253 Brass LN M32 .160 4,0 1.417 36,0
M40 x 1,5 2254 Brass LN M40 .177 4,5 1.811 46,0
M50 x 1,5 2255 Brass LN M50 .217 5,5 2.165 55,0
Nickel Plated Brass Nickel-Plated Brass
 

Material: Nickel-Plated Brass

Temperature Rating: -40°C to 100°C (-40°F to 212°F)

Heyco® Metal Locknuts
EMC Nickel-Plated Brass
Thread Size Part
Number		 Description Part Dimensions
A
Thickness		 B
Wrenching Flats
in. mm. in. mm.
PG Threads
PG 7 4671 EMC LN PG 7 .13 3,3   .59 15,0
PG 9 4672 EMC LN PG 9   .71 18,0
PG 11 4673 EMC LN PG 11 .14 3,5   .83 21,0
PG 13.5 4674 EMC LN PG 13.5   .94 24,0
PG 16 4675 EMC LN PG 16 1.02 26,0
PG 21 4676 EMC LN PG 21 .16 4,0 1.26 32,0
PG 29 4677 EMC LN PG 29 .18 4,6 1.61 41,0
Metric Threads
M8 x 1,25 4681 EMC LN M8   .13 3,3   .43 11,0
M10 x 1,5 4682 EMC LN M10   .51 13,0
M12 x 1,5 4683 EMC LN M12 .14 3,5   .59 15,0
M16 x 1,5 4684 EMC LN M16   .75 19,0
M20 x 1,5 4685 EMC LN M20 .16 4,0   .94 24,0
M25 x 1,5 4686 EMC LN M25 1.18 30,0
M32 x 1,5 4687 EMC LN M32 .20 5,0 1.42 36,0
EMC Nickel Plated Brass
EMC Nickel-Plated Brass