Steel Fasteners or Fastener Materials, or Both, Intended for Use at Any Temperature from Cryogenic to the Creep Range
ASTM A962 Specification covers a group of common requirements that shall apply to carbon, alloy and stainless steel fasteners or fastener materials, or both, under any of the following ASTM Specifications or under any other ASTM Specifications that invoke this specification or portions
| Title of Specifications | ASTM Designation |
|---|---|
| Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service | A 193 / A 193M |
| Carbon and Alloy Steel Nuts for Bolts for High Pressure and High-Temperature Service | A 194 / A 194M |
| Alloy Steel Bolting Materials for Low-Temperature Service | A 320 / A 320M |
| Alloy-Steel Turbine-Type Bolting Material Specially Heat Treated for High-Temperature Service | A 437 / A 437M |
| High-Temperature Bolting Materials With Expansion Coefficients Comparable to Austenitic Stainless Steels | A 453 / A 453M |
| Alloy-Steel Bolting Materials for Special Applications | A 540 / A 540M |
| Precipitation-Hardening Bolting Material (UNS N07718) for High Temperature Service | A 1014 / A 1014M |
Nuts shall be assembled on a threaded mandrel or a test bolt as illustrated in above images (a) Tension Method or (b) Compression Method. The minimum proof load required by the product specification shall be applied using a free running cross head speed of 1.0 in [25 mm] per minute maximum and shall be held for at least 10 s. The nut shall resist this load without stripping or rupture, and shall be removable by hand, without use of tooling, after the load is released. A wrench may be used to loosen the nut one-half turn maximum to start it in motion. The test shall be discarded if the threads of the mandrel or test bolt are damaged during the test.
Cone Proof Load test is performed when visible surface discontinuities become a matter of issue. The test uses a conical washer and threaded mandrel to determine the load-carrying ability of hardened steel nuts through 11⁄2 in. [36 mm] in diameter assembled as shown in Fig. 2. The minimum cone proof load required by the product specification shall be applied using a free running cross head speed of 0.12 in. [3 mm] per minute maximum and shall be held for at least
| Nominal Threads | Threads per Inch | Stress Area (in²) | Cone Proof Load, lbf | ||||
|---|---|---|---|---|---|---|---|
| Based on Proof Stress, psi | |||||||
| 120000 | 130000 | 135000 | 150000 | 175000 | |||
| 1/4 | 28 | 0.0364 | 4050 | 4375 | 4550 | 5050 | 5900 |
| 1/4 | 20 | 0.0318 | 3525 | 3825 | 3975 | 4400 | 5150 |
| 5/16 | 24 | 0.0580 | 6300 | 6825 | 7100 | 7875 | 9200 |
| 5/16 | 18 | 0.0524 | 5700 | 6175 | 6400 | 7125 | 8300 |
| 3/8 | 24 | 0.0878 | 9350 | 10125 | 10525 | 11700 | 13625 |
| 3/8 | 16 | 0.0775 | 8250 | 8950 | 9300 | 10300 | 12050 |
| 7/16 | 20 | 0.1187 | 12350 | 13400 | 13900 | 15450 | 18050 |
| 7/16 | 14 | 0.1063 | 11100 | 12000 | 12450 | 13850 | 16150 |
| 1/2 | 20 | 0.1599 | 16300 | 17650 | 18350 | 20400 | 23800 |
| 1/2 | 13 | 0.1419 | 14500 | 15700 | 16300 | 18100 | 21100 |
| 9/16 | 18 | 0.2030 | 20200 | 21900 | 22800 | 25300 | 29500 |
| 9/16 | 12 | 0.1820 | 18200 | 19700 | 20400 | 22700 | 26500 |
| 5/8 | 18 | 0.2560 | 25000 | 27000 | 28100 | 31200 | 36400 |
| 5/8 | 11 | 0.2260 | 22000 | 23900 | 24800 | 27500 | 32100 |
| 3/4 | 16 | 0.3730 | 34700 | 37600 | 39000 | 43400 | 50600 |
| 3/4 | 10 | 0.3340 | 31000 | 33600 | 35000 | 38800 | 45200 |
| 7/8 | 14 | 0.5090 | 45000 | 48800 | 50600 | 56400 | 65600 |
| 7/8 | 9 | 0.4620 | 40800 | 44200 | 46000 | 51200 | 59600 |
| 1 | 12 | 0.6630 | 55600 | 60400 | 62600 | 69600 | 81200 |
| 1 | 8 | 0.6060 | 51000 | 55200 | 57200 | 63600 | 74200 |
| 1 1/8 | 12 | 0.8560 | 68000 | 73800 | 76600 | 85000 | 99200 |
| 1 1/8 | 8 | 0.7900 | 62800 | 68000 | 70600 | 78600 | 91600 |
| 1 1/8 | 7 | 0.7630 | 60750 | 65750 | 68250 | 75750 | 88500 |
| 1 1/4 | 12 | 1.0730 | 80500 | 87250 | 90500 | 100500 | 117250 |
| 1 1/4 | 8 | 1.0000 | 75000 | 81250 | 84250 | 93750 | 109250 |
| 1 1/4 | 7 | 0.9690 | 72750 | 78750 | 81750 | 90750 | 106000 |
| 1 3/8 | 12 | 1.3150 | 92750 | 100500 | 104250 | 116000 | 135250 |
| 1 3/8 | 8 | 1.2330 | 87000 | 94250 | 98000 | 108750 | 126750 |
| 1 3/8 | 6 | 1.1550 | 81500 | 88250 | 91500 | 101750 | 118750 |
| 1 1/2 | 12 | 1.5810 | 104250 | 113000 | 117500 | 130500 | 152250 |
| 1 1/2 | 8 | 1.4920 | 98500 | 106750 | 110750 | 123000 | 143500 |
| 1 1/2 | 6 | 1.4050 | 92750 | 100500 | 104250 | 116000 | 135250 |
| Nominal Size, mm |
Thread Pitch |
Stress Area, mm2 |
Cone Proof Load, kN | ||||
|---|---|---|---|---|---|---|---|
| Based on Proof Stress | |||||||
| 825 MPa | 895 MPa | 930 MPa | 1035 MPa | 1205 MPa | |||
| ASTM A962 M6 | 1 | 20.1 | 15.4 | 16.7 | 17.4 | 19.3 | 22.5 |
| ASTM A962 M8 | 1.25 | 36.6 | 27.3 | 29.6 | 30.8 | 34.3 | 39.9 |
| ASTM A962 M10 | 1.5 | 58 | 42.1 | 45.7 | 47.5 | 52.8 | 61.5 |
| ASTM A962 M12 | 1.75 | 84.3 | 59.5 | 64.5 | 67 | 74.5 | 87 |
| ASTM A962 M14 | 2 | 115 | 79 | 86 | 89.5 | 99.5 | 115.5 |
| ASTM A962 M16 | 2 | 157 | 104.5 | 113.5 | 117.5 | 131 | 152.5 |
| ASTM A962 M20 | 2.5 | 245 | 153 | 167 | 173 | 193 | 224 |
| ASTM A962 M22 | 2.5 | 303 | 184 | 200 | 208 | 231 | 269 |
| ASTM A962 M24 | 3 | 353 | 207 | 224 | 233 | 260 | 302 |
| ASTM A962 M27 | 3 | 459 | 256 | 278 | 289 | 322 | 374 |
| ASTM A962 M30 | 3.5 | 561 | 296 | 322 | 334 | 372 | 432 |
| ASTM A962 M36 | 4 | 817 | 382 | 416 | 432 | 480 | 558 |
The material shall conform to the impact requirements prescribed in the product specification.
Sampling for impact testing shall conform to the product specification.
The impact test specimen shall have the form and dimensions shown in of Test Methods and Definitions A 370 for the Charpy V-notch specimen, Type A. The longitudinal axis of the specimen shall be parallel to the direction of rolling or, in the case of forgings, to the longest axis of the component the test bar represents. The notch shall be located on the test specimen surface which most closely approaches a radial direction. The base of the notch shall be as nearly as practicable perpendicular to the longest axis of the component.
The material shall conform to the hardness requirements prescribed in the product specification. Hardness testing shall be performed in accordance with Test Methods and Definitions A 370.
Tensile tests prevail over hardness tests in the event a conflict exists relative to minimum strength unless otherwise specified in the product specification.
Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.
E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E112 Test Methods for Determining Average Grain Size
E139 Test Methods for Conducting Creep, Creep-Rupture,and Stress-Rupture Tests of Metallic Materials
E150 Recommended Practice for Conducting Creep and Creep-Rupture Tension Tests of Metallic Materials Under Conditions of Rapid Heating and Short Times
E151 Recommended Practice for Tension Tests of Metallic Materials at Elevated Temperatures with Rapid Heating and Conventional or Rapid Strain Rates
E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
E328 Test Methods for Stress Relaxation for Materials and Structures
E566 Practice for Electromagnetic (Eddy Current) Sorting of Ferrous Metals
E709 Guide for Magnetic Particle Testing
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F1940 Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M for Steel Forgings, General Requirements
ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.3 Screw Thread Gaging System for Dimensional Acceptability - Inch Screw Threads (IN, UNR, and UNJ)
ASME B1.13M Metric Screw Threads - M Profile
ASME B1.21M Metric Screw Threads - MJ Profile
ASME B1.2 Gauges & gauging for Unified Screw Threads(Imperial)
| S1 | Product Marking |
|---|---|
| S2 | Stress Relieving |
| S3 | Stress Relieving |
| S4 | Sequential or Continuous Strand Casting |
| S5 | Bolts, Studs and Bolting Material for Dynamic Service |
| S6 | Magnetic Particle Examination |
| S7 | Liquid Penetrant Examination |
| S8 | Acceptance Criteria |
| S9 | Positive Material Identification Examination |
| S10 | Pressure Equipment Directive Mechanical Testing |