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: ASME B18.2.2 / ASTM A194 2H
Fastener Catalog & Standard Specification
Active: ASME B18.2.2 / ASTM A194 2H (Heavy Hex Nut (ASTM A194 2H))
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ASME B18.2.2 / ASTM A194 2HASTM STANDARDFull ThreadUNC
Heavy Hex Nuts (Imperial / Petrochemical)
Thicker and wider across flats than standard finished hex nuts. Specially heat-treated for high-pressure, high-temperature bolted joints.
CAD Schematic
Nominal blueprint for 7/8"
Engineering Schematic / CAD Dimension InspectorModel: 7/8"
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
- • Proof load stress: 175,000 psi (Grade 2H). Standard hardness: 24 to 35 HRC.
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
Chemical Composition & Metallurgy
Elemental mass percentages, grain structure & mechanical properties
Elemental Composition (Mass %)
CCarbon0.25 - 0.55%
MnManganese0.60 - 1.20%
PPhosphorus0.025% max
SSulfur0.025% max
SiSilicon0.15 - 0.35%
CrChromium0.20 - 0.50% (Optional)
BBoron0.0008 - 0.005% (Boron-treated)
FeIronBalance (~97.5%)
Mechanical Strength & Heat Treatment
Metallurgical Notes
- • Quenched and tempered at min 425°C to achieve fine tempered martensite microstructure.
- • Meets ISO 898-1 / ASTM F568M Class 8.8 specifications.
- • Boron-alloyed steels must contain min 0.0008% active Boron for hardenability.
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 | 12.3 | 10.8 | 14.3 | 91.5 | |
| 5/8" | 11 TPI | 27 | 31 | 15.5 | 13.6 | 17.5 | 146 | |
| 3/4" | 10 TPI | 31.8 | 36.5 | 18.6 | 16.5 | 20.6 | 216 | |
| 7/8" | 9 TPI | 36.5 | 42 | 21.8 | 19.5 | 23.8 | 298 | |
| 1" | 8 TPI | 41.3 | 47.5 | 25 | 22.2 | 27 | 391 | |
| 1-1/8" | 8-UN | 46 | 53 | 28.2 | 25.4 | 30.2 | 510 | |
| 1-1/4" | 8-UN | 50.8 | 58.5 | 31.3 | 28.6 | 33.3 | 645 | |
| 1-1/2" | 8-UN | 60.3 | 69.5 | 37.7 | 34.9 | 39.7 | 955 | |
| 1-3/4" | 8-UN | 69.8 | 80.5 | 44 | 41.3 | 46 | 1330 | |
| 2" | 8-UN | 79.4 | 91.5 | 50.4 | 47.6 | 52.4 | 1770 |