EARNEST NYLON INSERT LOCK NUTS
Earnest Machine Products line of NU Nylon Insert Lock Nuts are manufactured from carbon steel with dimensions that are comparable to heavy hex nuts. The locking ring is made from polyamide (nylon) to ensure that the locking feature is maintained in a wide variety of severe service conditions. The physical characteristics of nylon make it an excellent choice as self-locking material. The combination of its tensile strength, elastic recovery, chemical resistance, temperature resistance and impact resistance enables nylon insert lock nuts to resist vibrations and impact forces while maintaining the applied preload on the fastener.
When the mating bolt is inserted into the nylon insert, the threads compress the nylon. The elastic properties of the nylon then cause the nylon to flow into the threads creating a locking action a full 360° around the thread. This full engagement of the threads by the nylon material provides a dampening effect when subjected to impact loading.
Physical Properties of Nylon 6/6:
- Operating Temperature: 250° F
- Chemicals that nylon is resistance to: Organic Acids, Solvents, Oil, Organic Salts, Caustics, Mineral Salts
NU Series Lock Nuts
| Size |
Width
Across Flats (Nom) |
Thickness (Max) |
Wrenching
Height (ref) |
| 1/4” |
1/2 |
.390 |
.290 |
| 5/16” |
9/16 |
.453 |
.335 |
| 3/8” |
11/16 |
.562 |
.392 |
| 7/16” |
3/4 |
.609 |
.464 |
| 1/2” |
7/8 |
.718 |
.544 |
| 9/16” |
15/16 |
.812 |
.655 |
| 5/8” |
1 1/16 |
.874 |
.677 |
| 3/4” |
1 1/4 |
1.015 |
.790 |
| 7/8” |
1 7/16 |
1.140 |
.883 |
| 1” |
1 5/8 |
1.312 |
1.000 |
| 1 1/8” |
1 13/16 |
1.469 |
1.096 |
| 1 1/4” |
2 |
1.672 |
1.250 |
| 1 3/8” |
2 3/16 |
1.828 |
1.376 |
| 1 1/2” |
2 3/8 |
2.023 |
1.413 |
| 1 3/4” |
2 3/4 |
2.344 |
1.830 |
| 2” |
3 1/8 |
2.437 |
1.750 |
| 2 1/4” |
3 1/2 |
2.844 |
2.063 |
| 2 1/2” |
4 |
3.172 |
2.475 |
| 2 3/4” |
4 |
3.156 |
2.350 |
| 3” |
4 5/8 |
3.704 |
2.750 |
Earnest Machine Products line of NTU Nylon Insert Lock Nuts are manufactured to the material and hardness requirements for Grade 8 hex nuts per SAE J995 (or Grade C per IFI 100/107).
- Carbon Steel:
- Carbon: .55 max
- Manganese: .30 min
- Phosphorus: .04 max
- Sulfur: .05 max
- Hardness: Rc 26/ 34 (for sizes up to 1”) / Rc 26/36 (for sizes over 1”)
The dimensions of the NTU series are comparable to a jam nut thickness and a heavy hex nut width across flats.
NTU Series Lock Nuts
| Size |
Width
Across Flats (Nom) |
Thickness (Nom) |
Wrenching
Height (Ref) |
| 1” – 14 |
1 5/8 |
.891” |
.600” |
| 1 1/4” – 12 |
2 |
1.109” |
.767” |
| 1 1/2” – 12 |
2 3/8 |
1.313” |
.810” |
| 1 3/4” – 12 |
2 3/4 |
1.469” |
.986” |
| 2” – 12 |
3 1/8 |
1.672” |
1.016” |
| 2 1/4” – 12 |
3 1/2 |
1.938” |
1.179” |
| 2 1/2” – 12 |
4 |
2.187” |
1.523” |
| 2 3/4” – 12 |
4 |
2.187” |
1.523” |
| 3” – 12 |
4 5/8 |
2.725” |
2.075” |
NTE Series Lock Nuts
Dimensions for Jam (Thin) Nylon Insert Lock Nuts (NTE Series)
Nominal
Diameter |
Width
Across Flats |
Width
Across Corners Ref. |
Thickness
(NTM & NTE) |
Hex Height Ref. |
| F |
C |
H2 |
L2 |
| #1 |
.251/.241 |
.268 |
.124/.094 |
.075 |
| #2 |
.251/.241 |
.268 |
.124/.094 |
.075 |
| #3 |
.251/.241 |
.268 |
.124/.094 |
.075 |
| #4 |
.251/.241 |
.268 |
.124/.094 |
.075 |
| #5 |
.251/.241 |
.268 |
.124/.094 |
.075 |
| #6 |
.313/.302 |
.339 |
.140/.110 |
.090 |
| #8 |
.345/.332 |
.374 |
.187/.157 |
.110 |
| #10 |
.376/.362 |
.410 |
.187/.157 |
.110 |
| #12 |
.439/.423 |
.482 |
.218/.188 |
.125 |
| 1/4 |
.439/.428 |
.482 |
.218/.188 |
.125 |
| 5/16 |
.502/.489 |
.552 |
.265/.235 |
.158 |
| 3/8 |
.564/.551 |
.622 |
.281/.251 |
.150 |
| 7/16 |
.627/.616 |
.698 |
.328/.298 |
.225 |
| 1/2 |
.752/.736 |
.837 |
.328/.298 |
.190 |
| 9/16 |
.877/.861 |
.978 |
.374/.344 |
.225 |
| 5/8 |
.940/.922 |
1.051 |
.406/.376 |
.265 |
| 3/4 |
1.064/1.052 |
1.191 |
.421/.391 |
.288 |
| 7/8 |
1.252/1.239 |
1.403 |
.484/.454 |
.340 |
| 1 |
1.440/1.427 |
1.615 |
.578/.516 |
.405 |
| 1 1/8 |
1.627/1.614 |
1.826 |
.672/.610 |
.500 |
| 1 1/4 |
1.815/1.788 |
2.038 |
.765/.703 |
.523 |
| 1 3/8 |
2.008/1.973 |
2.232 |
.821/.759 |
.493 |
| 1 1/2 |
2.197/2.159 |
2.444 |
.828/.766 |
.565 |
NE & NM Series Lock Nuts
Dimensions for Standard Hex Nylon Insert Lock Nuts
NE Series – fractional sizes
NM Series – machine screw sizes
Nominal
Diameter |
F Width
Across Flats |
C Width
Across Corners Ref. |
H1 Thickness |
L1 Hex
Height Ref. |
| #1 |
.251/.241 |
.268 |
.153/.133 |
.081 |
| #2 |
.251/.241 |
.268 |
.153/.133 |
.081 |
| #3 |
.251/.241 |
.268 |
.153/.133 |
.081 |
| #4 |
.251/.241 |
.268 |
.153/.133 |
.081 |
| #5 |
.251/.241 |
.268 |
.153/.133 |
.081 |
| #6 |
.313/.302 |
.339 |
.188/.168 |
.103 |
| #8 |
.345/.332 |
.374 |
.239/.219 |
.140 |
| #10 |
.376/.362 |
.410 |
.249/.229 |
.140 |
| #12 |
.439/.423 |
.482 |
.328/.298 |
.225 |
| 1/4 |
.439/.428 |
.482 |
.328/.298 |
.225 |
| 5/16 |
.502/.489 |
.552 |
.359/.329 |
.250 |
| 3/8 |
.564/.551 |
.622 |
.468/.438 |
.335 |
| 7/16 |
.627/.616 |
.698 |
.468/.438 |
.324 |
| 1/2 |
.752/.736 |
.837 |
.609/.579 |
.464 |
| 9/16 |
.877/.861 |
.978 |
.656/.626 |
.469 |
| 5/8 |
.940/.922 |
1.051 |
.765/.735 |
.593 |
| 3/4 |
1.064/1.052 |
1.191 |
.890/.860 |
.742 |
| 7/8 |
1.252/1.239 |
1.403 |
.999/.969 |
.790 |
| 1 |
1.440/1.427 |
1.615 |
1.078/1.016 |
.825 |
| 1 1/8 |
1.627/1.614 |
1.826 |
1.208/1.141 |
.930 |
| 1 1/4 |
1.815/1.788 |
2.038 |
1.422/1.360 |
1.125 |
| 1 3/8 |
2.008/1.973 |
2.232 |
1.609/1.547 |
1.282 |
| 1 1/2 |
2.197/2.159 |
2.444 |
1.640/1.576 |
1.313 |