Bridge Lube Nuts are used primarily in the bridge 
industry. They come with lubrication applied on the internal threads and on the face of the nut that will be in contact with the joint. The purpose of leaving sides of the nut and opposing face of the nut clean of lubrication is to reduce the amount of labor and safety issues that occur when cleaning the exposed faces of the nut to prepare for painting. The heavy hex nut is double chamfered for general purpose mechanical and structural uses, with A325 and A490 heavy hex structural bolts.
Finish: Mechanically Galvanized, with lubricate on the internal threads and face of the nut.
Grade: A563 DH Heavy Hex Nut
Table X1.1 Nut Compatibility Chart
| Grade of Bolt | Finish | Nominal Size | A563 Grade and ANSI Nut Style | |||
|---|---|---|---|---|---|---|
| Recommended | Suitable | |||||
| Hex | Heavy Hex | Hex | Heavy Hex | |||
| A307 Grade A & C | Any | 1/4 to 1-1/2 | A | - | B,D,DH | A,B,C,D,DH,DH3 |
| A307 Grade A & C | Any | >1-1/2 to 2 | - | A | A | C,D,DH,DH3 |
| A307 Grade A & C | Any | >2 to 4 | - | A | - | C,D,DH,DH3 |
| A307 Grade B | Any | 1/4 to 1-1/2 | - | A | B,D,DH | B,C,D,DH,DH3 |
| A307 Grade B | Any | >1-1/2 to 2 | - | A | A | - |
| A307 Grade B | Any | >2 to 4 | - | A | - | - |
| A325 Type 1 | Plain | 1/2 - 1-1/2 | - | C | - | C3, D, DH, DH3 |
| A325 Type 1 | Galvanized | 1/2 - 1-1/2 | - | DH | - | - |
| A325 Type 3 | Plain | 1/2 - 1-1/2 | - | C3 | - | DH3 |
| A354 Grade BC | Plain | 1/4 to 1-1/2 | - | C | - | C3, D, DH, DH3 |
| A354 Grade BC | Plain | >1-1/2 to 4 | - | C | - | C3, D, DH, DH3 |
| A354 Grade BC | Galvanized | 1/4 to 1-1/2 | - | DH | - | - |
| A354 Grade BC | Galvanized | >1-1/2 to 4 | - | DH | - | - |
| A354 Grade BD | Plain | 1/4 to 1-1/2 | - | DH | - | D, DH, DH3 |
| A354 Grade BD | Plain | >1-1/2 to 4 | - | DH | - | DH3 |
| A449 | Plain | 1/4 to 1-1/2 | B | - | D, DH | B,C,D,DH,DH3 |
| A449 | Plain | >1-1/2 to 3 | - | A | - | C,C3,D,DH,DH3 |
| A449 | Galvanized | 1/4 to 1-1/2 | - | DH | D, DH | D |
| A449 | Galvanized | >1-1/2 to 3 | - | DH | - | D |
| A490 Type 1 | Plain | 1/2 - 1-1/2 | - | DH | - | DH3 |
| A490 Type 3 | Plain | 1/2 - 1-1/2 | - | DH3 | - | - |
| A687 | Plain | 5/8 - 3 | - | DH | - | DH, DH3 |
| A687 | Galvanized | 5/8 - 3 | - | DH3 | - | - |
| F1554 Grade 55 | Plain | 1/4 to 1-1/2 | A | - | B,D,DH | A,B,C,D,DH,DH3 |
| F1554 Grade 55 | Plain | >1-1/2 to 4 | - | A | - | C,D,DH,DH3 |
| F1554 Grade 55 | Galvanized | 1/4 to 4 | - | A | - | C,D,DH,DH3 |
| F1554 Grade 105 | Plain | 1/4 to 1-1/2 | D | - | - | DH, DH3 |
| F1554 Grade 105 | Plain | >1-1/2 to 3 | - | DH | - | DH3 |
| F1554 Grade 105 | Galvanized | 1/4 to 3 | - | DH | - | DH3 |
| Source: ASTM A563-07a Appendix X1 | ||||||
