Engineering Data Sheets
Fastener Data Sheets& CAD
Browse ISO, DIN, ASTM and ASME fastener standards with dimensional specifications, CAD blueprints, drilling & clearance data, chemical composition and mechanical properties.
Reference: ASTM A193 Grade B7 / ASME B16.5
Fastener Catalog & Standard Specification
Active: ASTM A193 Grade B7 / ASME B16.5 (Stud Bolt (Pressure Vessel & Flanges))
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ASTM A193 Grade B7 / ASME B16.5ASTM STANDARDFull Length ContinuousUNC
All-Thread Stud Bolts with Heavy Hex Nuts
Continuous all-thread stud bolt manufactured from chromium-molybdenum alloy steel (AISI 4140/4142), heat-treated for high temperature and pressure containment.
CAD Schematic
Nominal blueprint for 7/8"
Engineering Schematic / CAD Dimension InspectorModel: 7/8" × 50mm
Nominal Thread (d)7/8" P=9 TPImm
Wrench / Allen (s)36.5mm e=42
Tap Drill DiameterØ 19.5 mm
Tensile Stress Area (Aₛ)298 mm²
Manufacturing & Drilling Engineering Notes
- • Standard pairing is 1 Stud Bolt with 2 ASTM A194 Grade 2H (or Grade 8/8M) Heavy Hex Nuts.
- • Stud lengths are measured from first thread to first thread (point-to-point).
Size Specification Inspector
7/8"Select diameter & order quantity
Select Nominal Thread Diameter
Thread Pitch9 TPI mm
Wrench (A/F Spanner s)36.5 mm
Recommended Tap DrillØ 19.5 mm
Clearance Hole (H13)Ø 23.8 mm
Tensile Stress Area (Aₛ)298 mm²
Single unit weight (steel): 0.1431 kg
Chemical Composition & Metallurgy
Elemental mass percentages, grain structure & mechanical properties
Elemental Composition (Mass %)
CCarbon0.37 - 0.49%
MnManganese0.65 - 1.10%
PPhosphorus0.035% max
SSulfur0.040% max
SiSilicon0.15 - 0.35%
CrChromium0.75 - 1.20%
MoMolybdenum0.15 - 0.25%
FeIronBalance (~96.5%)
Mechanical Strength & Heat Treatment
Metallurgical Notes
- • Chromium-molybdenum AISI 4140 alloy steel, liquid quenched and tempered at minimum 593°C (1100°F).
- • For sour gas / H2S service, Grade B7M (max 99 HRB / 22 HRC, 100% hardness inspected) is mandatory per NACE MR0175.
- • Paired with ASTM A194 Grade 2H heavy hex nuts.
Dimensional Specification
Thread / Pitch / Across Flats / Corners / Height / Drill / Clearance / Stress Area (mm)
| Thread (d) | Pitch | A/F (s) | Corners (e) | Height | Tap Drill | Clear H13 | Stress Area | |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 13 TPI | 22.2 | 25.4 | 0 | 10.8 | 14.3 | 91.5 | |
| 5/8" | 11 TPI | 27 | 31 | 0 | 13.6 | 17.5 | 146 | |
| 3/4" | 10 TPI | 31.8 | 36.5 | 0 | 16.5 | 20.6 | 216 | |
| 7/8" | 9 TPI | 36.5 | 42 | 0 | 19.5 | 23.8 | 298 | |
| 1" | 8 TPI | 41.3 | 47.5 | 0 | 22.2 | 27 | 391 | |
| 1-1/8" | 8-UN | 46 | 53 | 0 | 25.4 | 30.2 | 510 | |
| 1-1/4" | 8-UN | 50.8 | 58.5 | 0 | 28.6 | 33.3 | 645 | |
| 1-3/8" | 8-UN | 55.6 | 64 | 0 | 31.8 | 36.5 | 792 | |
| 1-1/2" | 8-UN | 60.3 | 69.5 | 0 | 34.9 | 39.7 | 955 | |
| 1-5/8" | 8-UN | 65 | 75 | 0 | 38.1 | 42.9 | 1135 | |
| 1-3/4" | 8-UN | 69.8 | 80.5 | 0 | 41.3 | 46 | 1330 | |
| 1-7/8" | 8-UN | 74.6 | 86 | 0 | 44.5 | 49.2 | 1545 | |
| 2" | 8-UN | 79.4 | 91.5 | 0 | 47.6 | 52.4 | 1770 | |
| 2-1/4" | 8-UN | 88.9 | 102.5 | 0 | 54 | 59 | 2280 | |
| 2-1/2" | 8-UN | 98.4 | 113.5 | 0 | 60.3 | 65.5 | 2860 | |
| 2-3/4" | 8-UN | 108 | 124.5 | 0 | 66.7 | 72 | 3500 | |
| 3" | 8-UN | 117.5 | 135.5 | 0 | 73 | 78.5 | 4210 |