IndFastPro Industrial Fasteners Manufacturer
Get a Quote
English
English English Deutsch German Français French Español Spanish Italiano Italian Português Portuguese Nederlands Dutch Polski Polish Türkçe Turkish Русский Russian 日本語 Japanese 한국어 Korean العربية Arabic Tiếng Việt Vietnamese 繁體中文 Traditional Chinese

ISO 4032 Hex Regular Nuts (Style 1)

ISO 4032 hex regular nuts, style 1 — the standard-height metric hex nut, M1.6 to M60 — with the full collected 29-size table: pitch, countersink and bearing-face diameters, nut height, effective bearing height, and across-flats tolerances.

Last updated: 2026-11

Request a Quote

ISO 4032 Hex Regular Nuts (Style 1) in an industrial setting
Illustrative image redrawn from real product references — not a photograph of stocked items.

Specifications

ISO 4032 is the reference metric hex nut: nominal (style 1) height of roughly 0.8–0.9 × thread diameter, chamfered bearing faces, and the across-flats series shared with the hex bolts it pairs with (ISO 4014/4017). The m w row in the table — effective bearing height — is the load-bearing figure: it is the thread engagement a mating bolt can count on, and it is what separates a style 1 nut from the thin ISO 4035, whose reduced height trades engagement for clearance and thread run-up. The collected table runs M1.6 to M60, with sizes above M39 printed in parentheses by the source (the less-common upper ladder). Pairing discipline follows the bolt: strength class matching between nut and bolt protects the bolt from nut-thread stripping — the grade-pairing guidance on this site covers the combinations. Property class and finish are not part of the collected table and follow the drawing callout; for the lock-nut variants see the DIN 985 nyloc and DIN 980 Stover pages.

Standard ISO 4032 — hexagon regular nuts (style 1), chamfered
Series M1.6 – M60 (29 sizes tabulated; sizes above M39 printed in parentheses in the source)
Tabulated geometry Per size: pitch P, chamfer c, countersink d a, bearing face d w, across-corners e, nut height m (max/min), effective bearing height m w, across-flats s (max/min)
Nut form Style 1 — nominal height, double-chamfered bearing faces
Family note Standard-height counterpart of ISO 4035 thin nuts; pairs with ISO 4014/4017 hex bolts; lock variants DIN 985 / DIN 980
Materials / strength Not tabulated by the collected specification — per RFQ (property class and finish per drawing callout)
ISO 4032 hex regular nuts (style 1) - per-size dimensions (M1.6 - M60)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; c = washer-face/chamfer; d a = countersink diameter on the bearing face; d w = bearing face diameter; e = width across corners; m = nut height; m w = effective bearing height of the nut; s = width across flats. Sizes above M39 are printed in parentheses in the source (less common) — reproduced verbatim. Materials, property classes and finishes are not tabulated by the collected specification.
Nominal threadP — Pitchc — maxc — mind a — maxd a — mind w — mine — minm — maxm — minm w — mins — max=nominal sizes — min
M1.60.350.20.11.841.62.43.411.31.050.83.23.02
M20.40.20.12.323.14.321.61.351.143.82
M2.50.450.30.12.92.54.15.4521.751.454.82
M30.50.40.153.4534.66.012.42.151.75.55.32
M40.70.40.154.645.97.663.22.92.376.78
M50.80.50.155.7556.98.794.74.43.587.78
M610.50.156.7568.911.055.24.93.9109.78
M81.250.60.158.75811.614.386.86.445.21312.73
M101.50.60.1510.81014.617.778.48.046.41615.73
M121.750.60.15131216.620.0310.810.378.31817.73
M1620.80.217.31622.526.7514.814.111.32423.67
M202.50.80.221.62027.732.951816.913.53029.16
M2430.80.225.92433.339.5521.520.216.23635
M303.50.80.232.43042.850.8525.624.319.44645
M3640.80.238.93651.160.793129.423.55553.8
M424.510.345.4426071.33432.425.96563.1
M48510.351.84869.582.63836.429.17573.1
M565.510.360.55678.793.564543.434.78582.8
M64610.369.16488.2104.865149.139.39592.8
(M3.5)0.60.40.1543.556.582.82.55265.82
(M14)20.60.1515.11419.623.3612.812.19.72120.67
(M18)2.50.80.219.51824.929.5615.815.112.12726.16
(M22)2.50.80.223.72231.437.2919.418.114.53433
(M27)30.80.229.1273845.223.822.5184140
(M33)3.50.80.235.63346.655.3728.727.421.95049
(M39)410.342.13955.966.4433.431.825.46058.8
(M45)4.510.348.64564.776.953634.427.57068.1
(M52)510.356.25274.288.254240.432.38078.1
(M60)5.510.364.86083.499.214846.437.19087.8
ISO hex nuts — calculator grade/standard map, M1.6–M64 (style 1/2, heavy, thin; grades A/B/C)All dimensions in millimetres. Second collected view of the ISO hex-nut ladder: this table is the source calculator's grade/standard map, where each size row names the product grade(s) and the ISO standard(s) it maps to (ISO 4032 style 1 / ISO 4033 heavy / ISO 4034 thin, with ISO 8673 fine-pitch entries from M18 up), plus the per-standard dimension envelopes. Compound cells (grade lists, standard lists, tolerance class lists, "/"-separated multi-standard values, "-" where a standard does not print a value) are reproduced verbatim — a cell like "4.7 / 5.1 / 5.6" reads as ISO 4032 / ISO 4033 / ISO 4034 respectively. The first dimension table for this page (single-standard grade A/B ladder) is tabulated separately; this map adds the grade C / heavy / thin and fine-pitch envelopes. Duplicated 3.5 selection reproduced verbatim (see anomaly note).
SizeProduct GradeStandardThread TolerancePitchc Maxc Minda Maxda Mindw Mine Minm Maxm Minmw Mins Maxs Min
1.6AISO 40326H0.350.20.11.841.602.43.411.301.050.83.203.02
2AISO 40326H0.40.20.12.32.03.14.321.601.351.14.003.82
2.5AISO 40326H0.450.30.12.92.54.15.452.001.751.45.004.82
3AISO 40326H0.50.400.153.453.004.66.012.402.151.75.505.32
3.5AISO 40326H0.60.400.154.03.556.582.802.5526.005.82
3.5AISO 40326H0.60.400.154.03.556.582.802.5526.005.82
5A / CISO 4032 / ISO 4033 / ISO 40346H / 7H0.80.50 / 0.5 / -0.15 / -5.75 / -5.00 / -6.9 / 6.78.79 / 8.634.7 / 5.1 / 5.64.4 / 4.83.5 / 3.848.007.78 / 7.64
6A / CISO 4032 / ISO 4033 / ISO 40346H / 7H10.50 / 0.5 / -0.15 / -6.75 / -6.00 / -8.9 / 8.711.05 / 10.895.2 / 5.7 / 6.44.9 / 5.43.9 / 4.32 / 3.710.009.78 / 9.64
8A / CISO 4032 / ISO 4033 / ISO 40346H / 7H1.250.60 / 0.6 / -0.15 / -8.75 / -8.00 / -11.6 / 11.514.38 / 14.26.80 / 7.5 / 7.96.44 / 7.14 / 6.45.2 / 5.71 / 5.113.0012.73 / 12.57
10A / CISO 4032 / ISO 4033 / ISO 40346H / 7H1.50.60 / 0.6 / -0.15 / -10.8 / -10.0 / -14.6 / 14.517.77 / 17.598.40 / 9.3 / 9.58.04 / 8.94 / 8.06.4 / 7.1516.0015.73 / 15.57
12A / CISO 4032 / ISO 4033 / ISO 40346H / 7H1.750.60 / 0.6 / -0.15 / -13 / -12 / -16.6 / 16.520.03 / 19.8510.80 / 12.00 / 12.210.37 / 11.57 / 10.48.3 / 9.2618.0017.73 / 17.57
14A / CISO 4032 / ISO 4033 / ISO 40346H / 7H20.60 / 0.6 / -0.15 / -15.1 / -14.0 / -19.6 / 19.223.36 / 22.7812.8 / 14.1 / 13.912.1 / 13.49.7 / 10.721.0020.67 / 20.16
16A / CISO 4032 / ISO 4033 / ISO 40346H / 7H20.8 / -0.2 / -17.3 / -16.0 / -22.5 / 2226.75 / 26.1714.8 / 16.4 / 15.914.1 / 15.711.3 / 12.624.0023.67 / 23.16
18B / CISO 4032 / ISO 4034 / ISO 86736H / 7H2.5 / 1.50.8 / -0.2 / -19.5 / -18.0 / -24.9 / 24.8529.5615.8 / 16.915.112.1 / 12.0827.0026.16
20B / CISO 4032 / ISO 4033 / ISO 40346H / 7H2.50.8 / -0.2 / -21.6 / -20.0 / -27.732.9518.0 / 20.3 / 19.016.9 / 19.013.5 / 15.230.0029.16
22B / CISO 4032 / ISO 4034 / ISO 86736H / 7H2.5 / 1.50.8 / -0.2 / -23.7 / -22.0 / -31.4 / 31.3537.2919.4 / 20.218.114.5 / 14.483433
24B / CISO 4032 / ISO 4033 / ISO 40346H / 7H30.8 / -0.2 / -25.9 / -24.0 / -33.3 / 33.239.5521.5 / 23.9 / 22.320.2 / 22.616.2 / 18.13635
27B / CISO 4032 / ISO 4034 / ISO 86736H / 7H3 / 20.8 / -0.2 / -29.1 / -27.0 / -3845.223.8 / 24.722.5 / 22.618 / 18.14140
30B / CISO 4032 / ISO 4033 / ISO 40346H / 7H3.50.8 / -0.2 / -32.4 / -30.0 / -42.8 / 42.750.8525.6 / 28.6 / 26.424.3 / 27.319.4 / 21.84645
33B / CISO 4032 / ISO 4034 / ISO 86736H / 7H3.5 / 20.8 / -0.2 / -35.6 / -33.0 / -46.6 / 46.5555.3728.7 / 29.527.421.9 / 21.925049
36B / CISO 4032 / ISO 4033 / ISO 40346H / 7H40.8 / -0.2 / -38.9 / -36.0 / -51.160.7931.0 / 34.7 / 31.929.4 / 33.123.5 / 26.5 / 23.255.0 / 5553.8
39B / CISO 4032 / ISO 4034 / ISO 86736H / 7H4 / 31.0 / -0.3 / -42.1 / -39.0 / -55.9 / 55.8666.4433.4 / 34.331.825.4 / 25.4460.058.8
42B / CISO 4032 / ISO 4034 / ISO 86736H / 7H4.5 / 31.0 / -0.3 / -45.4 / -42.0 / -60 / 59.9571.334.0 / 34.932.425.9 / 25.9265.0 / 6563.1
45B / CISO 4032 / ISO 4034 / ISO 86736H / 7H4.5 / 31.0 / -0.3 / -48.6 / -45.0 / -64.776.9536.0 / 36.934.427.5 / 27.5270.068.1
48B / CISO 4032 / ISO 4034 / ISO 86736H / 7H5 / 31.0 / -0.3 / -51.8 / -48.0 / -69.5 / 69.4582.638.0 / 38.936.429.1 / 29.1275.0 / 7573.1
52B / CISO 4032 / ISO 4034 / ISO 86736H / 7H5 / 41.0 / -0.3 / -56.2 / -52.0 / -74.288.2542.0 / 42.940.432.3 / 32.3280.078.1
56B / CISO 4032 / ISO 4034 / ISO 86736H / 7H5.5 / 41.0 / -0.3 / -60.5 / -56.0 / -78.7 / 78.6693.5645.0 / 45.943.434.7 / 34.7285.0 / 8582.8
60B / CISO 4032 / ISO 4034 / ISO 86736H / 7H5.5 / 41.0 / -0.3 / -64.8 / -60.0 / -83.4 / 83.4199.2148.0 / 48.946.437.1 / 37.1290.087.8
64B / CISO 4032 / ISO 4034 / ISO 86736H / 7H6 / 41.0 / -0.3 / -69.1 / -64.0 / -88.2 / 88.16104.8651.0 / 52.449.1 / 49.439.3 / 39.5 / 39.2895.0 / 9592.8
  • Row 6 (3.5): The M3.5 row appears twice with identical values — reproduced verbatim.
  • Row 5 (3.5): The size column skips 4 in this calculator map (M3.5 jumps to 5); the single-standard table on this page carries M4. Values are not invented for the skipped size.

Materials

  • Material, property class and finish specified per RFQ — the collected specification table covers geometry only

Ordering & documentation

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

  • The fastener family (ISO 4032 Hex Regular Nuts (Style 1)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
  • Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
  • Quantity per size and your target delivery date.
  • Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

Frequently asked questions

What does the m w row in the ISO 4032 table represent?

The effective bearing height — the portion of nut height that actually carries thread load after chamfers and countersink are deducted. It is the figure behind bolt-nut strength pairing: a nut must develop the bolt's full tensile strength before its threads strip, and m w is the engagement the standard guarantees for that purpose. This is also why substituting a thinner nut (ISO 4035) reduces the usable engagement even when the across-flats wrench size is identical.

What is the MOQ and lead time for this nut type?

The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common diameters in this nut type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.

Related knowledge

Request a Quote

Get factory-direct pricing from the manufacturer.

What to include in your inquiry

  • ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
  • ✓ Sizes, lengths and thread type (metric or inch).
  • ✓ Quantity per size and your target delivery date.
  • ✓ Destination country, plus any coating or finish requirement.
  • ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
  • ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
  • ✓ Factory-direct pricing
  • ✓ Standard and custom specifications
  • ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
  • ✓ Full fastener family support

We use your details only to answer this inquiry — see our Privacy notice for everything the form collects.