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Bolts · GB/T 5782 / ISO 4014

ISO 4014 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001)

For Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001), ISO 4014 defines dimensions, tolerances and product grades. The sections below describe its scope, what it does NOT cover, and the equivalents across DIN, ISO and ASME.

ISO 4014 — Scope

ISO 4014 specifies the dimensions and tolerances of hex head bolt — gb/t 5782 / iso 4014 (series 001). Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).

Tolerance & Product Grades

ISO 4014, alongside the related GB/T 5782 / ISO 4014 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.

Dimensions Specified by ISO 4014

SizePitch (mm)Nominal diameter d (mm)Length L (mm)Width across flats s (mm)Width across corners e (mm)Head height k (mm)
M30.53205.56.012.0
M40.74257.07.662.8
M50.85308.08.793.5
M61.064010.011.054.0
M81.2585013.014.385.3
M101.5106016.017.776.4
M121.75128018.020.037.5
M142.0148021.023.368.8
M162.01610024.026.7510.0
M182.51810027.030.1411.5
M202.52012030.033.5312.5
M243.02415036.039.9815.0
M303.53018046.050.8518.7
M364.03620055.060.7922.5

Equivalent Standards

ISO 4014 (partial thread) corresponds closely to DIN 931; the fully-threaded variant ISO 4017 corresponds to DIN 933.

When to Specify ISO 4014

Choose ISO 4014 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for hex head bolt — gb/t 5782 / iso 4014 (series 001).

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Specification
Business Information

Dimensions & Specifications (GB/T 5782 / ISO 4014)

SizePitch (mm)Nominal diameter d (mm)Length L (mm)Width across flats s (mm)Width across corners e (mm)Head height k (mm)
M30.53205.56.012.0
M40.74257.07.662.8
M50.85308.08.793.5
M61.064010.011.054.0
M81.2585013.014.385.3
M101.5106016.017.776.4
M121.75128018.020.037.5
M142.0148021.023.368.8
M162.01610024.026.7510.0
M182.51810027.030.1411.5
M202.52012030.033.5312.5
M243.02415036.039.9815.0
M303.53018046.050.8518.7
M364.03620055.060.7922.5

Frequently Asked Questions

What is the equivalent of ISO 4014 in DIN or ASME?

ISO 4014 (partial thread) corresponds closely to DIN 931; the fully-threaded variant ISO 4017 corresponds to DIN 933.

What product grades does ISO 4014 define?

ISO 4014 typically distinguishes product grades for precision (A/B) and general engineering (C). The selection for Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001) depends on the precision your application requires.

Does ISO 4014 specify the mechanical strength?

No. ISO 4014 controls only the geometry of hex head bolt — gb/t 5782 / iso 4014 (series 001). The mechanical strength is set by ISO 898-1 (bolts / screws) or ISO 898-2 (nuts), and the finish is governed by separate standards.

Can I substitute ISO 4014 for the corresponding DIN standard on a drawing?

On modern drawings the ISO standard is the master reference; the older DIN equivalent is a cross-reference. For most dimensional purposes the parts are interchangeable, but check tolerance grades and the head height — these are the most common points of divergence.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.