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 F436 / F436M
Fastener Catalog & Standard Specification
Active: ASTM F436 / F436M (Hardened Structural Washer)
Select a fastener below to view its data sheet
ASTM F436 / F436MASTM STANDARDNon-ThreadedUNC
Hardened Steel Structural Washers
Through-hardened structural flat circular washers (38 to 45 HRC) designed specifically for ASTM A325 and A490 structural bolt assemblies.
CAD Schematic
Nominal blueprint for 7/8"
Engineering Schematic / CAD Dimension InspectorModel: 7/8"
Nominal Thread (d)7/8" P=-mm
Wrench / Allen (s)0mm e=0
Tap Drill DiameterØ 0 mm
Tensile Stress Area (Aₛ)0 mm²
Manufacturing & Drilling Engineering Notes
- • Required under the turned element (head or nut) when tightening high-strength structural bolts.
Size Specification Inspector
7/8"Select diameter & order quantity
Select Nominal Thread Diameter
Thread Pitch- mm
Wrench (A/F Spanner s)N/A
Recommended Tap DrillØ 0 mm
Clearance Hole (H13)Ø 0 mm
Tensile Stress Area (Aₛ)0 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" | - | 0 | 0 | 3.5 | 0 | 0 | 0 | |
| 5/8" | - | 0 | 0 | 3.5 | 0 | 0 | 0 | |
| 3/4" | - | 0 | 0 | 3.8 | 0 | 0 | 0 | |
| 7/8" | - | 0 | 0 | 4 | 0 | 0 | 0 | |
| 1" | - | 0 | 0 | 4.5 | 0 | 0 | 0 | |
| 1-1/8" | - | 0 | 0 | 4.5 | 0 | 0 | 0 | |
| 1-1/4" | - | 0 | 0 | 4.5 | 0 | 0 | 0 | |
| 1-1/2" | - | 0 | 0 | 4.8 | 0 | 0 | 0 |