Drawings
Part Number Material Codes
- Substitute for “J” in the part number.
- J - Carbon Steel, 450⁰
- C, D – Corrosion Resistant Steel, 800⁰
Part Number Finish Codes
- Substitute for “XX” in the part number.
- XX - Unfinished Plain
- 2A - .0002 Clear Cadmium SAE AMS QQ-P-416, Type I, Class 3
- 2B - .0003 Clear Cadmium, SAE AMS QQ-P-416,Type I, Class 2
- 2C - .0003 Clear Cadmium /Yellow Chromate SAE AMS QQ-P-416, Type II, Class 2
- 2D - .0002 Zinc Tri Clear ASTM B633-15, SC 1, Type III
- 2E - Black Oxide AMS 2485K, MIL-DTL-13924D
- 2F - Phos & Oil 72 HR, ASTM F1137 Gr D
- Other available finishes
Standards & Specifications:
- Parts coated with a non-dry, wax type lubricant compliant to NASM25027
- Prevailing Torque Locking Performance compliant with requirements of NASM25027
- Threads as specified per MIL-S-8879
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All-Metal FlexSix Heavy Hex Locknut (Inch)
Product Description
The Aztech All-Metal Heavy Hex FlexSix (Inch) is the industrial workhorse of the product line. Compliant to NASM25027 testing, this all-metal prevailing torque locknut is available in coarse thread through 2” diameter. It derives its locking action entirely from the geometry of the nut itself — six deflected metal “beams” that grip the bolt thread mechanically across these discrete, engineered contact segments. Each beam carries a proportional share of the load for a locking action that is secure, uniform, and repeatable. Threads are 2B fit and match the typical mating thread. Certification of testing and performance is provided with each shipment.
Available variations come in fine thread and 3B thread fits, a wide range of materials including Steel, Stainless Steel, Brass and Aluminum.
Applications
The FlexSix Hex Locknut is the preferred choice in Aerospace as well as the most demanding industrial applications. This sector includes highly stressed machinery, turbine generators, high end sports and recreation equipment, and heavy-duty transportation manufacturers — applications where impact, shock, and vibration resistance and superior prevailing torque endurance are required. As an all-metal design it performs across temperature extremes.
Available Sizes
| Nut Type | Grade | Lock | Size | Thread | Availability |
|---|---|---|---|---|---|
| FlexSix | Assorted | All-Metal | 1/4" – 2″ | NASM25027 | Request a Quote |
| Thread Size |
Part Number Steel, Plain |
A Max / Min |
B REF |
C Max |
D Min |
Proof Load Steel & CRES Min Lb |
|---|---|---|---|---|---|---|
| 1/4-20 UNJC 2B | 25CFHLJXXBQ | .502 / .492 | .552 | .290 | .094 | 5,730 |
| 5/16-18 UNJC 2B | 31CFHLJXXBQ | .564 / .553 | .622 | .312 | .113 | 9,600 |
| 3/8-16 UNJC 2B | 37CFHLJXXBQ | .627 / .616 | .696 | .384 | .144 | 13,800 |
| 7/16-14 UNJC 2B | 43CFHLJXXBQ | .752 / .741 | .837 | .446 | .163 | 14,900 |
| 1/2-13 UNJC 2B | 50CFHLJXXBQ | .814 / .803 | .907 | .509 | .196 | 22,000 |
| 9/16-12 UNJC 2B | 56CFHLJXXBQ | .940 / .928 | 1.051 | .571 | .216 | 27,000 |
| 5/8-11 UNJC 2B | 62CFHLJXXBQ | 1.002 / .990 | 1.119 | .634 | .245 | 34,000 |
| 3/4-10 UNJC 2B | 75CFHLJXXBQ | 1.127 / 1.115 | 1.260 | .759 | .325 | 50,000 |
| 7/8-9 UNJC 2B | 87CFHLJXXBQ | 1.314 / 1.301 | 1.470 | .884 | .397 | 64,600 |
| 1-8 UNJC 2B | 100CFHLJXXBQ | 1.502 / 1.489 | 1.682 | 1.009 | .462 | 85,000 |
| 1-1/8-7 UNJC 2B | 112CFHLJXXBQ | 1.814 / 1.801 | 2.038 | 1.134 | .549 | 106,000 |
| 1-1/4-7 UNJC 2B | 125CFHLJXXBQ | 2.002 / 1.988 | 2.250 | 1.259 | .616 | 125,000 |
| 1-3/8-6 UNJC 2B | 137CFHLJXXBQ | 2.190 / 2.176 | 2.484 | 1.384 | .684 | 145,000 |
| 1-1/2-6 UNJC 2B | 150CFHLJXXBQ | 2.377 / 2.363 | 2.697 | 1.509 | .748 | 182,000 |
| 1-5/8-5.5 UNJC 2B | 162CFHLJXXBQ | 2.564 / 2.549 | 2.909 | 1.634 | .814 | 194,000 |
| 1-3/4-5 UNJC 2B | 175CFHLJXXBQ | 2.752 / 2.737 | 3.124 | 1.759 | .882 | 233,000 |
| 1-7/8-5 UNJC 2B | 187CFHLJXXBQ | 2.940 / 2.925 | 3.338 | 1.884 | .950 | 257,000 |
| 2-4 UNJC 2B | 200CFHLJXXBQ | 3.127 / 3.112 | 3.552 | 2.009 | 1.018 | 310,000 |
