Standard DTI FAQs
Compatible Bolt, Nut, and Flat Washer Specifications to ASTM F959 DTI's
The Research Council on Structural Connections (RCSC) specification governs what grades of bolting hardware can be used with DTI's.
| A325 BOLT TYPE | Nut Specification, Grade and Finish | Flat Washer |
|---|---|---|
| Type 1, plain (uncoated) | A563 C, C3, D, DH, and DH3 or A194 and 2H; plain | ASTM F436 (only) black or mechanically galvanized |
| Type 1, galvanized | A563 DH; galvanized and lubricated | |
| Type 3, plain | A563 C3 and DH3; plain | |
| A490 BOLT TYPE | Nut Specification, Grade and Finish | Flat Washer |
| Type 1, plain | A563 DH and DH3 or A194 2H; plain | F436 black only |
| Type 3, plain | A563 DH3; plain |
Other bolts and nuts like SAE J429 cap screws may also be used with DTI's. Call for special advice.
