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Tools

Free Engineering Tools

A hardness conversion calculator and a steel-grade heat-treatment selector — built by the plant team that uses these numbers every day.

11 free calculators for the decisions taken before a hardening or plating order is placed: converting hardness between HRC, HV and HB, choosing a steel grade for a target hardness, estimating fastener weight, planning a salt-spray requirement, checking thread fit against a coating allowance, sizing a hydrogen de-embrittlement bake, and setting bolt torque. Each runs in the browser, needs no sign-up, and names the standard it follows.

Hardness Converter HRC ↔ HV ↔ HB

Convert Rockwell, Vickers, Brinell and approximate tensile strength per ASTM E140 / ISO 18265, with the full reference chart.

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Which Steel Grades Harden — and How Far

Pick a grade (S45C, SCM435, SUJ2, SUS304…) and see the right process and realistic hardness range for small parts.

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Fastener Weight: pcs ↔ kg

Convert piece counts to kilograms from DIN/ISO dimensions (M3–M24), with a per-1000-pcs weight chart — estimate batch weight before requesting a quote.

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Finishing Specification Builder for Purchasing and QC

Build a zinc-plating, effective case-depth, phosphate-coating or failure-investigation callout; copy it or save as PDF for RFQ and QC.

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Salt Spray Test Plan Builder

Build a salt-spray test request with method, duration, inspection interval, specimen count, corrosion criteria and reporting. Copy or save it for RFQ and QC.

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Coating thickness → thread fit (GO/NO-GO)

Check whether a zinc-plating thickness will still pass the GO gauge on M3–M24 external threads by tolerance class (6g/6h/6e). Reference estimator using the ISO 4042 4× rule.

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Hydrogen Embrittlement — is baking required?

Check whether electroplated fasteners need hydrogen de-embrittlement baking by property class, hardness (HRC/HV) or tensile strength, with the reference bake window per ISO 4042 / ASTM B850.

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Bolt Tightening Torque & Proof Load

Calculate tightening torque, proof load, tensile stress area and target preload for M3–M24 bolts by property class (8.8/10.9/12.9) and friction condition. Free reference tool.

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Thread Engagement Length

Minimum engaged thread length so a tapped hole or nut strips at or above the bolt tensile fracture — by size, property class (8.8/10.9/12.9) and internal-thread material. Free reference tool.

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Bolt Size Estimator (from load)

Enter an axial working load and safety factor and get the smallest metric bolt (M3–M24) and property class (8.8/10.9/12.9) whose proof load covers it. Free ISO 898-1 reference tool.

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Bolt Property Class — Mechanical Properties (ISO 898-1)

Reference table of ISO 898-1 bolt strength classes 4.6, 4.8, 5.8, 8.8, 10.9, 12.9 — tensile Rm, yield, Vickers HV and Rockwell HRC hardness, and elongation. Which hardness each class needs.

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