Technical Data: ASTM F959 Chemical Requirements
ASTM F959 Range of Compression Loads
This specification covers the requirements for compressible-washer-type direct tension indicators, (DTIs) capable of indicating the achievement of a specified minimum bolt tension in a structural bolt.
Chemical Requirements
| Composition,% | ||||
| Element | Heat Analysis | Product Analysis | ||
| Type 1 Series | Type 3 SeriesA | Type 1 Series | Type 3 SeriesA | |
| Carbon | 0.30-0.55 | 0.27-0.58 | ||
| Manganese | 0.50-0.90 | 0.47-0.93 | ||
| Phosphorus, Max | 0.04 | 0.040 | 0.048 | 0.045 |
| Sulfur, Max | 0.045 | 0.050 | 0.053 | 0.055 |
| Silicon | 0.15-0.35 | 0.15-0.35 | 0.13-0.37 | 0.13-0.37 |
| Chromium | 0.45-0.65 | 0.42-0.68 | ||
| Nickel | 0.25-0.45 | 0.22-0.48 | ||
| Copper | 0.25-0.45 | 0.22-0.48 | ||
AType 3 DTI's are also permitted to be manufactured from any of the Type 3 steels in the chemical composition sections of Specifications A325 and F436 or ASTM A325M and A436M.
Acceptable Range of Compression Loads
| DTI Size (Nominal Diameter, in.) | Compression Load Range in Thousands of Pounds, (kips) | |
| Types 325 and 325-3 | Types 490 and 490-3 | |
| 1⁄2 | 12-14 | 15-18 |
| 5⁄8 | 19-23 | 24-29 |
| 3⁄4 | 28-34 | 35-42 |
| 7⁄8 | 39-47 | 49-59 |
| 1 | 51-61 | 64-77 |
| 11⁄8 | 56-67 | 80-96 |
| 11⁄4 | 71-85 | 102-122 |
| 13⁄8 | 85-102 | 121-145 |
| 11⁄2 | 103-124 | 148-178 |
| DTI Size (Nominal Diameter, mm) | Compression Load Range for Metric Series in Kilonewtons, (kN) | |
| Types 8.8-1 and 8.8-3 | Types 10.9-1 and 10.9-3 | |
| M16 | 91-109 | 114-131 |
| M20 | 142-170 | 179-206 |
| M22 | 176-211 | 221-254 |
| M24 | 205-246 | 257-296 |
| M27 | 267-320 | 334-384 |
| M30 | 326-391 | 408-469 |
| M36 | 475-570 | 595-684 |