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ASTM A563M Nuts Specification

Carbon Steel & Alloy Steel Metric Nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts

ASTM A563M Hex Nut, Heavy hex Nut, Square Nuts, Hexagon High Nuts, Slotted Nuts

ASTM A563M specification covers metric M1.6 to M100 Carbon Steel & Alloy Steel Imperial Nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts. rades C3 and DH3 nuts have atmospheric corrosion resistance and weathering characteristics comparable to that of the steels covered in Specifications A242/A242M, A588/A588M, and A709/A709M. The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition. When properly exposed to the atmosphere, these steels can be used bare (uncoated) for many applications. Steel for nuts shall be made by the open-hearth, basic-oxygen, or electric-furnace process except that steel for Grades O, A, and B nuts may be made by the acid-bessemer process. Nuts may be made cold or hot by forming, pressing, or punching or may be machined from bar stock. Threads shall be formed by tapping or machining.

Related Specifications of ASTM A563M Bolting

A563 A194 A307 A325 A394 A449 F3148 A490 F3125 A687 A242/A242M A588/A588M A606/A606M A709/A709M

ASTM A563M Nut Bolt Suitability Guide

Class of Bolt,A Screw, or Stud Nominal Diameter of Bolt/Nut Combination Surface Finish of BoltB Property Class and Dimensional Style of Nut
5 9 10 12 8S 8S3 10S 10S3
H1C HHD H2E HFF HHD H1C HFF H2E HFF HHD HHD HHD HHD HHD
F568M, Class 4.6 M5 to M36 plain G H I I H I I I I I I I I I
zinc-coated G H H H H H H I I H H H I H
M42 to M100 plain H G H H I H H H H I H H H H
zinc-coated H G H H H H H H H I H H H H
F568, Class 4.8 M1.6 to M16 plain G H I I H I I I I H H H H H
zinc-coated G H H H H H H I I H H H I H
F568, Class 5.8 M5 to M24 plain G H I I H I I I I H I I I I
zinc-coated G H H H H H H I I H H H I H
F568, Class 8.8 M16 to M36 plain H H G I H I I I I H I I I I
zinc-coated H H H H H H H G I H H H I H
M42 to M100 plain H H H H G H H H H I H H H H
zinc-coated H H H H H H H H H G H H H H
F568, Class 8.8.3 M16 to M36 plain H H H H H H H H H H H G H I
F568, Class 9.8 M1.6 to M16 plain H H G I H I I I I H H H H H
zinc-coated H H H H H H H G I H H H I H
F568, Class 10.9 M5 to M36 plain H H H H H G I I I H I I I I
M42 to M100 H H H H H H H H H G H H H H
F568, Class 10.9.3 M16 to M36 plain H H H H H H H H H H H H H G
F568, Class 12.9 M1.6 to M36 plain H H H H H H H G I H H H I I
M42 to M100 H H H H H H H H H G H H H H
A325M, Types 1 and 2 M16 to M36 plain H H H H H H H H H H G I I I
zinc-coated H H H H H H H H H H H H G H
A325M, Type 3 M16 to M36 plain H H H H H H H H H H H G H I
A490M, Types 1 and 2 M16 to M36 plain H H H H H H H H H H H H G I
A490M, Type 3 M16 to M36 plain H H H H H H H H H H H H H G
A394, Grade A M12 to M24 zinc-coated G H H H H H H I I H H H I H
A394, Grade B M12 to M24 zinc-coated H H H H H H H G I H H H I H
  • (A) The term "bolt" includes all types of externally threaded products.
  • (B) "Plain" applies to any bolt that is non-coated or non-plated, or that has a coating or plating of insufficient thickness to require that the nut be overtapped. "Zinc-coated" applies to any bolt that is hot-dip or mechanically zinc-coated or otherwise coated or plated with a coating or plating of sufficient thickness to require the use of overtapped nuts.
  • (C) H1-ANSI B 18.2.4.1M hex nut, Style 1.
  • (D) HH-ANSI B 18.2.4.6M heavy hex nut.
  • (E) H2-ANSI B 18.2.4.2M hex nut, Style 2.
  • (F) HF-ANSI B 18.2.4.4M hex flange nut.
  • (G) Recommended nut class and style.
  • (H) Non-suitable nut.
  • (I) Suitable nut class and style.

ASTM A563M Chemical Composition

ASTM A563M Chemical Requirements for 5, 9, 8S, 10, 10S and 12 Nuts

Property Class of Nut Analysis C Mn, min P, max S, max
5, 9, 8S heat product 0.55 max 0.58 max . . . . . . 0.04 0.048 0.15A . . .
10B, 10S heat product 0.55 max 0.58 max 0.30 0.27 0.04 0.048 0.05 0.058
12B heat product 0.20-0.55 0.18-0.58 0.60 0.57 0.04 0.048 0.05 0.058
  • (A) For Classes 5 and 9, a sulfur content of 0.23 % max. is acceptable with the purchasers approval.
  • (B) For Classes 10 and 12, a sulfur content of 0.15 % max. is acceptable provided the manganese is 1.35 % min.

ASTM A563M Chemical Requirements for Classes 8S3 and 10S3 Nuts

Element Analysis Steel Analyses for ASTM A563M Class 8S3 Nuts A ASTM A563M Class 10S3 Nuts
N A B C D E F
C Heat analysis . . . 0.33-0.40 0.38-0.48 0.15-0.25 0.15-0.25 0.20-0.25 0.20-0.25 0.20-0.53
Product analysis . . . 0.31-0.42 0.36-0.50 0.14-0.26 0.14-0.26 0.18-0.27 0.19-0.26 0.19-0.55
Mn Heat analysis . . . 0.90-1.20 0.70-0.90 0.80-1.35 0.40-1.20 0.60-1.00 0.90-1.20 0.40 min
Product analysis . . . 0.86-1.24 0.67-0.93 0.76-1.39 0.36-1.24 0.56-1.04 0.86-1.24 0.37 min
P Heat analysis 0.07-0.15 0.040 max 0.06-0.12 0.035 max 0.040 max 0.040 max 0.040 max 0.046 max
Product analysis 0.07-0.155 0.045 max 0.06-0.125 0.040 max 0.045 max 0.045 max 0.045 max 0.052 max
S Heat analysis 0.050 max 0.050 max 0.050 max 0.040 max 0.050 max 0.040 max 0.040 max 0.050 max
Product analysis 0.055 max 0.055 max 0.055 max 0.045 max 0.055 max 0.045 max 0.045 max 0.055 max
Si Heat analysis 0.20-0.90 0.15-0.35 0.30-0.50 0.15-0.35 0.25-0.50 0.15-0.35 0.15-0.35 . . .
Product analysis 0.15-0.95 0.13-0.37 0.25-0.55 0.13-0.37 0.20-0.55 0.13-0.37 0.13-0.37 . . .
Cu Heat analysis 0.25-0.55 0.25-0.45 0.20-0.40 0.20-0.50 0.30-0.50 0.30-0.60 0.20-0.40 0.20 min
Product analysis 0.22-0.58 0.22-0.48 0.17-0.43 0.17-0.53 0.27-0.53 0.27-0.63 0.17-0.43 0.17 min
Ni Heat analysis 1.00 max 0.25-0.45 0.50-0.80 0.25-0.50 0.50-0.80 0.30-0.60 0.20-0.40 0.20 minB
Product analysis 1.03 max 0.22-0.48 0.47-0.83 0.22-0.53 0.47-0.83 0.27-0.63 0.17-0.43 0.17 min
Cr Heat analysis 0.30-1.25 0.45-0.65 0.50-0.75 0.30-0.50 0.50-1.00 0.60-0.90 0.45-0.65 0.30 min
Product analysis 0.25-1.30 0.42-0.68 0.47-0.83 0.27-0.53 0.45-1.05 0.55-0.95 0.42-0.68 0.25 min
V Heat analysis . . . . . . . . . 0.020 min . . . . . . . . . . . .
Product analysis . . . . . . . . . 0.010 min . . . . . . . . . . . .
Mo Heat analysis . . . . . . 0.06 max . . . 0.10 max . . . . . . 0.15 minB
Product analysis . . . . . . 0.07 max . . . 0.11 max . . . . . . 0.14 min
Ti Heat analysis . . . . . . . . . . . . 0.05 max . . . . . . . . .
Product analysis . . . . . . . . . . . . . . . . . . . . . . . .
  • (A) Class 8S3 nuts may be made of any of the listed steel analyses. Selection of steel analysis shall be the option of the manufacturer.
  • (B) Nickel or molybdenum may be used.

ASTM A563M Mechanical Requirements

ASTM A563M Mechanical Requirements of Nuts 5, 5 (overtapped), 9

Nominal Diameter Property Class
5 5 (overtapped) 9
Proof Load Stress, MPa Hardness Proof Load Stress, MPa Hardness Proof Load Stress, MPa Hardness
Rockwell Vickers Rockwell Vickers Rockwell Vickers
min max min max min max min max min max min max
M1.6 to M2.5 M3 to M4 520 B70 C30 130 302 . . . . . . . . . . . . . . . . . . 900 . . . B85 . . . C30 . . . 170 . . . 302
M5 and M6 580 B70 C30 130 302 465 B70 C30 130 302 915 B89 C30 188 302
M8 and M10 590 B70 C30 130 302 470 B70 C30 130 302 940 B89 C30 188 302
M12 to M16 610 B70 C30 130 302 490 B70 C30 130 302 950 B89 C30 188 302
M20 to M36 630 B78 C30 146 302 500 B78 C30 146 302 920 B89 C30 188 302
M42 to M100 630 B70 C30 128 302 500 B70 C30 128 302 920 B89 C30 188 302

ASTM A563M Mechanical Requirements of Nuts 10, 12, 12 (Overtapped) 

 Nominal Diameter Property Class
10 12 12 (Overtapped)
Proof Load Stress, MPa Hardness Proof Load Stress, MPa Hardness Proof Load Stress, MPa Hardness
Rockwell Vickers Rockwell Vickers Rockwell Vickers
min max min max min max min max min max min max
M1.6 to M2.5           . . . . . . . . . . . . . . . . . . . . . . . . . . .  
M3 to M4 1040 C26 C36 272 353 1150 C26 C36 272 353          
M5 and M6                     920 C26 C36 272 353
M8 and M10           1160 C26 C36 272 353 930 C26 C36 272 353
M12 to M16 1050 C26 C36 272 353 1190 C26 C36 272 353 950 C26 C36 272 353
M20 to M36 1060 C26 C36 272 353 1200 C26 C36 272 353 960 C26 C36 272 353
M42 to M100 . . . . . . . . . . . . . . . 1200 C26 C36 272 353 960 C26 C36 272 353

ASTM A563M Mechanical Requirements of Nuts 8S, 8S3, 10S, 10S3, 10S (Overtapped)

 Nominal Diameter Property Class
8S and 8S3 10S and 10S3 10 S (Overtapped)
Proof Load Stress, MPa Hardness Proof Load Stress, MPa Hardness Proof Load Stress, MPa Hardness
Rockwell Vickers Rockwell Vickers Rockwell Vickers
min max min max min max min max min max min max
M12 to M36 1075 B89 C38 188 372 1245 C26 C38 272 372 1165 C26 C38 272 372

ASTM A563M Nut Proof Load Values, kN

Nominal Diameter and Thread Pitch Thread Stress Area, mm2 Property Class of Nut
5 5 (over- tapped) 9 10 12 12 (over- tapped) 8S and 8S3 10S and 10S3 10S (over- tapped)
M1.6 x 0.35 1.27 0.66 . . . . . . 1.32 . . . . . . . . . . . . . . .
M2 x 0.4 2.07 1.08 . . . . . . 2.15 . . . . . . . . . . . . . . .
M2.5 x 0.45 3.39 1.76 . . . . . . 3.53 . . . . . . . . . . . . . . .
M3 x 0.5 5.03 2.62 . . . 4.53 5.23 . . . . . . . . . . . . . . .
M3.5 x 0.6 6.78 3.53 . . . 6.10 7.05 . . . . . . . . . . . . . . .
M4 x 0.7 8.78 4.57 . . . 7.90 9.13 . . . . . . . . . . . . . . .
M5 x 0.8 14.2 8.23 6.60 13.0 14.8 16.3 13.1 . . . . . . . . .
M6 x 1 20.1 11.7 9.35 18.4 20.9 23.1 18.5 . . . . . . . . .
M8 x 1.25 36.6 21.6 17.2 34.4 38.1 42.5 34.0 . . . . . . . . .
M10 x 1.5 58.0 34.2 27.3 54.5 60.3 67.3 53.9 . . . . . . . . .
M12 x 1.75 84.3 51.4 41.3 80.1 88.5 100 80.1 90.6 105 98.2
M14 x 2 115 70.2 56.4 109 121 137 109 124 143 134
M16 x 2 157 95.8 76.9 149 165 187 149 169 195 183
M20 x 2.5 245 154 123 225 260 294 235 263 305 285
M22 x 2.5 303 . . . . . . . . . . . . . . . 291 326 377 353
M24 x 3 353 222 177 325 374 424 339 379 439 411
M27 x 3 459 . . . . . . . . . . . . . . . . . . 493 571 535
M30 x 3.5 561 353 281 516 595 673 539 603 698 654
M36 x 4 817 515 409 752 866 980 784 878 1020 952
M42 x 4.5 1120 706 560 1030 . . . 1340 1080 . . . . . . . . .
M48 x 5 1470 920 735 1350 . . . 1760 1410 . . . . . . . . .
M56 x 5.5 2030 1280 1020 1870 . . . 2440 1950 . . . . . . . . .
M64 x 6 2680 1690 1340 2470 . . . 3220 2570 . . . . . . . . .
M72 x 6 3460 2180 1730 3180 . . . 4150 3320 . . . . . . . . .
M80 x 6 4340 2730 2170 3990 . . . 5210 4170 . . . . . . . . .
M90 x 6 5590 3520 2800 5140 . . . 6710 5370 . . . . . . . . .
M100 x 6 6990 4400 3500 6430 . . . 8390 6710 . . . . . . . . .

ASTM A563M Dimensions

Nut Diameter Diametral Allowance, μm
M5 156
M6 200
M8 255
M10 310
M12 365
M14 and M16 420
M20 and M22 530
M24 and M27 640
M30 750
M36 860
M42 970
M48 1080
M56 1190
M64 to M100 1300

ASTM A563M Bolting Surface Treatment Specifications

ASTM A563M Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

ASME Dimensional Standards

B18.2.4.1M Metric Hex Nuts
B18.2.4.6M Metric Heavy Hex Nuts

ASTM A563M Bolting Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

ASTM A563M Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E709 Guide for Magnetic Particle Testing
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M Specification for Steel Forgings, General Requirements

ASME Threading Specifications

ASME B1.13M Metric Screw Threads - M Profile
ASME B1.21M Metric Screw Threads - MJ Profile

ASTM A563M Supplementary Requirements

S1 Supplementary Lubricant Requirements for Nuts
S2 Lubricant Dye
S3 Lubricant Placement