What is a Hex Nut?
A nut is a type of fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten parts together. The two components work together by a combination of friction between the threads, a slight stretch of the bolt, and compression of the mating parts.
Nuts are graded with strength ratings compatible with their respective bolts; for example, an ISO property class 10 nut will be able to support the bolt-proof strength load of an ISO property class 10.9 bolt without stripping. Likewise, an SAE class 5 nut can support the proof load of an SAE Grade 5 bolt, and so on. Typically hex nuts proof load should be matched with the mating hex bolts tensile strength.
A nylon insert lock nut is a kind of nut that includes a nylon collar insert. The insert is placed at the end of the nut and its inner diameter (ID) is slightly smaller than the major diameter of the screw. The insert deforms elastically over the threads of the screw, but threads are not cut into the nylon. The nylon insert locks the nut in two ways. It forces the bottom face of the screw threads against the top face of the nut threads, increasing the friction between the two, and applies a compressive force against the screw itself.
Heavy hex nuts are slightly larger and thicker than finish hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.
Hex Nuts Supplier
Bayou City Bolt, a leading hex nuts supplier, carries a complete line of Hex Nuts and Heavy Hex Nuts. These nuts are available in both US Standard and Metric. 2H and A325 Heavy Structural Nuts are stocked as well. In addition, we also stock specialty nuts, such as Castle, Coupling and Eye Nuts.
- Acme Nut
- Acorn Nut
- Allen Nut
- Cage Nut
- Cap Nut
- Castle Nut
- Coupling Nut
- Eye Nut
- Flange Nut
- Hex Nut
- Hi Nut
- Left Hand Thread Nut
- Slotted Nut
- Square Nut
- Tee Nut
- Wing Nut
Lock Nuts Distributor
Bayou City Bolt is also a Lock Nuts distributor. These nuts are available in both US Standard and Metric. In addition to the standard Nylon Insert Locknuts, interference locknuts such as Type-C and Stover are in stock. We also carry Flexlock nuts in thin and full height.
- Anco Lock Nuts
- Flexlock Nuts
- Nylon Insert Locknuts
- Type C Locknuts
- Two Way Locknuts
- Stover Locknuts
Learn more about our different types of hex nuts and locknuts
| Specification | Material | Nominal Size | Proof Load Stress psi | Hardness Rockwell Min/Max | Grade Identification Marking |
|---|---|---|---|---|---|
| ASTM A563 Grade A | Carbon Steel | 1/4 - 4 | 90000 | B68/C32 |  |
| ASTM A563 Grade A Heavy | Carbon Steel | 1 - 4 | 100,000 | B68/C32 |  |
| ASTM A563 Grade C Heavy | Carbon Steel May be Quenched and Tempered | 1/4 - 4 | 144,000 | B78/C38 |  |
| ASTM A563 GRADE DH HEAVY HEX | Carbon Steel Quenched and Tempered | 1 /4 - 4 | 175,000 | C24/C38 |  |
| ASTM A194 GRADE 2H HEAVY HEX | Medium Carbon Steel | 1/4 - 1 1/2 | 175,000 | C24/C35 |  |
| ASTM A194 GRADE 2HM HEAVY HEX | Medium Carbon Steel Quenched and Tempered | 1/4 - 1 1/2 |  |