Leaf Spring Material Grades & Heat Treatment Guide: SUP9, SUP9A, SUP11A, 50CrVA (51CrV4) & 60Si2Mn
Metallurgical comparison of automotive and truck leaf spring materials: SUP9 (SAE 5155), SUP9A (SAE 5160H), SUP11A, 50CrVA (51CrV4), and 60Si2Mn chemical composition, hardness, and thickness limits.
3-Leaf to 6-Leaf Trailer Leaf Spring Load Chart: 705lb, 1000lb, 1500lb, 3000lb & 5000lb Manufacturer Guide
Complete manufacturer specification chart for 3-leaf, 4-leaf, 5-leaf, and 6-leaf trailer leaf springs across 705lb, 916lb, 940lb, 1000lb, 1184lb, 1415lb, 1500lb, 1750lb, 2293lb, 3000lb, and 5000lb ratings.
Parabolic Leaf Spring Services vs. Semi-Elliptic Multi-Leaf Springs: CNC Taper Rolling & OEM Guide
Complete engineering guide to parabolic leaf spring services vs. semi-elliptic multi-leaf springs: CNC taper rolling formulas, 25–35% weight reduction, 50CrVA/SUP9A metallurgy, and OEM part numbers.
OEM Truck & Trailer Leaf Spring Cross-Reference Chart: Isuzu, Scania, TRA-2726, Mitsubishi, BPW & Ford
Master OEM truck and trailer leaf spring part number cross-reference chart: Isuzu 1-51130-961-0, Scania 1421060, Hutchens TRA-2726/2727/2728, Mitsubishi MC413899/F & Canter MB294519/MK310031, BPW 880368 & 24T, Fuwa T410012, Ford 43-698/43-1199, Freightliner 46-1189, and International 55-031.
Leaf Spring Rate & Load Capacity Calculator: 750lb–5000lb Spec Chart & SAE J510 Formulas
Interactive Leaf Spring Rate (N/mm & lb/in) and Load Capacity Calculator based on SAE J510 / JIS B 2710 formulas. Includes 750lb–5000lb trailer spring load chart and SUP9/SUP9A/50CrVA steel stress limits.
Types of Leaf Springs: Cantilever, Semi-Elliptical, Full Elliptical & Parabolic Guide + Load Calculator
Complete engineering guide to Cantilever Leaf Springs (Quarter-Elliptical), Semi-Elliptical, Full Elliptical, and Parabolic Tapered Leaf Springs. Includes an interactive Leaf Spring Rate & Load Capacity Calculator, 750lb–5000lb trailer load chart, and SUP9/SUP9A/50CrVA/60Si2Mn steel grade cross-reference.
