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    2. ISO 4032 Hexagon Regular Nuts (Style 1) Dimensional Standard

    ISO 4032 Hexagon Nuts | Style 1 Dimensions, DIN 934

    ISO 4032 Hexagon Regular Nut parameters provide comprehensive engineering data for Style 1 fasteners, currently the paramount global standard for metric coarse thread fastening.
    The ISO 4032 specification represents the current apex of global standardization for metric coarse pitch regular hexagon nuts, officially designated as "Style 1".
    Covering an expansive nominal size range from microscopic M1.6 micro-fasteners up to massive M64 industrial nuts, this standard meticulously defines the geometric characteristics necessary to achieve Product Grade A tolerances for threads D ≤ M16, and Product Grade B tolerances for threads D > M16.
    These product grades dictate the strictness of the dimensional runout, positional tolerances, and surface finish, ensuring highly reliable automation in high-volume manufacturing and automated assembly environments.
    A massive paradigm shift in the global fastener industry involves the ongoing, decades-long transition from the legacy German DIN 934 standard to the universally adopted modern ISO 4032 standard.
    For mechanical engineers, maintenance technicians, and procurement officers, this transition presents a profound technical nuance that drives massive search volume: the two standards are not dimensionally identical.
    Specifically, the Width Across Flats (WAF) was definitively altered for nominal sizes M10, M12, M14, and M22 to harmonize global wrench clearance standards.
    For example, a legacy DIN 934 M10 nut requires a 17mm wrench, whereas an ISO 4032 M10 nut is engineered for a 16mm wrench.
    Furthermore, the overall structural height (m) of ISO 4032 nuts is generally taller than those manufactured to the older DIN 934 parameters.
    This seemingly minor vertical increase is mechanically profound; it expands the total shear area of the internal threads, providing substantially greater resistance to thread stripping.
    This taller profile aligns the nut's internal load capacity directly with the modern, high-stress property classes defined under ISO 898-2.
    Because of these highly specific dimensional and structural discrepancies, nuts conforming to ISO 4032 cannot be blindly substituted with legacy DIN 934 nuts in high-stress structural boltings, as the older DIN parts possess inherently reduced loadability and run the risk of premature catastrophic stripping.

    ISO 4032 Hexagon Nuts

    ISO 4032 Hexagon Nuts Dimensions

    Nominal Size c da e m s Weight Per Pc
    Max Min Max Min Min Max Min Max Min
    M1.6 0.2 0.1 2.42 2 3.41 1.3 1.05 3.2 3.02 -
    M2 0.2 0.1 3.07 2.5 4.32 1.6 1.35 4 3.82 -
    M2.5 0.3 0.1 4.07 3.5 5.45 2 1.75 5 4.82 -
    M3 0.4 0.15 4.57 4 6.01 2.4 2.15 5.5 5.32 -
    M4 0.4 0.15 5.88 5 7.66 3.2 2.9 7 6.78 -
    M5 0.5 0.15 6.88 6 8.79 4.7 4.5 8 7.78 -
    M6 0.50 0.15 6.75 6.00 11.05 5.20 4.90 10.00 9.78 -
    M8 0.60 0.15 8.75 8.00 14.38 6.80 6.44 13.00 12.73 0.0046
    M10 0.60 0.15 10.80 10.00 17.77 8.40 8.04 16.00 15.73 0.0100
    M12 0.60 0.15 13.00 12.00 20.03 10.80 10.37 18.00 17.73 0.0151
    M14 0.60 0.15 15.10 14.00 23.36 12.80 12.10 21.00 20.67 0.0235
    M16 0.80 0.20 17.30 16.00 26.75 14.80 14.10 24.00 23.67 0.0304
    M18 0.80 0.20 19.50 18.00 29.56 15.80 15.10 27.00 26.16 0.0435
    M20 0.80 0.20 21.60 20.00 32.95 18.00 16.90 30.00 29.16 0.0587
    M22 0.80 0.20 23.70 22.00 37.29 19.40 18.10 34.00 33.00 0.0720
    M24 0.80 0.20 25.90 24.00 39.55 21.50 20.20 36.00 35.00 0.0983
    M27 0.80 0.20 29.10 27.00 45.20 23.80 22.50 41.00 40.00 0.1442
    M30 0.80 0.20 32.40 30.00 50.85 25.60 24.30 46.00 45.00 0.2022
    M33 0.80 0.20 35.60 33.00 55.37 28.70 27.40 50.00 49.00 0.2584
    M36 0.80 0.20 38.90 36.00 60.79 31.00 29.40 55.00 53.80 0.3586
    M39 1.00 0.30 42.10 39.00 66.44 33.40 31.80 60.00 58.80 0.4678
    M42 1.00 0.30 45.40 42.00 71.30 34.00 32.40 65.00 63.10 0.5908
    M45 1.00 0.30 48.60 45.00 76.95 36.00 34.40 70.00 68.10 0.7528
    M48 1.00 0.30 51.80 48.00 82.60 38.00 36.40 75.00 73.10 0.8989
    M52 1.00 0.30 56.20 52.00 88.25 42.00 40.40 80.00 78.10 1.1251
    M56 1.00 0.30 60.50 56.00 93.56 45.00 43.40 85.00 82.80 1.3227
    M60 1.00 0.30 64.80 60.00 99.21 48.00 46.40 90.00 87.80 1.5750
    M64 1.00 0.30 69.10 64.00 104.86 51.00 49.10 95.00 92.80 1.8190

    Related A194 Grades & References

    ISO 4032 hexagon nuts (Style 1) are the metric equivalent of ASME B18.2.2 hex nuts. For Style 2 (higher thickness) see ISO 4033; for thin (jam) nuts see ISO 4035. Common A194 grades manufactured to metric thread: Grade 2H carbon, Grade 8 304, Grade 8M 316. Full specification: ASTM A194 PDF.

    Frequently Asked Questions

    What is ISO 4032?

    ISO 4032 is the international standard for metric hexagon nuts Style 1 (standard hex nuts). It covers sizes from M1.6 to M64 and specifies width across flats, thickness, and tolerances. ISO 4032 is the metric equivalent of inch-series ASME B18.2.2 hex nuts.

    What is the difference between ISO 4032 and DIN 934?

    ISO 4032 supersedes DIN 934 as the international standard for metric hex nuts. The two are dimensionally equivalent for most sizes, though ISO 4032 introduced minor changes in width across flats for M10, M12, M14, and M22 — modern manufacturers default to ISO 4032 dimensions.

    What thread pitch do ISO 4032 nuts use?

    ISO 4032 nuts use the ISO Metric coarse thread series per ISO 261/ISO 262. Fine-thread variants are covered by ISO 8673 (Style 1) and ISO 8674 (Style 2).

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