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ASTM A563 TECHNICAL DATA

 

Order Grade A Heavy Hex Nuts Order DH Heavy Hex Nuts

 

 

Technical Data: ASTM A563 Chemical Requirements for Grades O, A, B, C, D, and DH Nuts ASTM A563 Chemical Requirements for Grades C3 and DH3 Nuts ASTM A563 Mechanical Requirements ASTM A563 Thread Dimensions and Overtapping Allowances for Nuts Hot Dip Zinc Coated per Specification ASTM A563 Nut and Bolt Suitability Guide

This specification covers chemical and mechanical requirements for eight grades of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.

Chemical Requirements for Grades O, A, B, C, D, and DH Nuts

Grade of Nut Composition, %
  Analysis Carbon Manganese, min Phosphorus, max Sulfur, max
           
O, A, B, C heat 0.55 max   0.12 0.15A
  product 0.58 max   0.13B  
DC heat 0.55 max 0.30 0.04 0.05
  product 0.58 max 0.27 0.048 0.058
  heat 0.20-0.55 0.60 0.04 0.05
DHC product 0.18-0.58 0.57 0.048 0.058

AFor Grades O, A, and B a sulfur content of 0.23 % max is acceptable with the purchasers approval.

BAcid bessemer steel only.

CFor Grades D and DH a sulfur cont4nt of 0.05-0.15% is acceptable provided the manganese is 1.35 % min.

Chemical Requirements for Grades C3 and DH3 Nuts

Element Composition, %
  Classes for Grade C3 NutsA Grade DH3
  N A B C D E F Nuts
Carbon:                
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
Manganese:                
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
Phosphorus:                
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
Sulfur:                
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
Silicon:                
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  
Copper:                
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
Nickel:                
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
Chromium:                
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 0.45 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 0.42 min
Vanadium:                
Heat analysis       0.020 min        
Product analysis       0.010 min        
Molybdenum:                
Heat analysis     0.06 max   0.10 max     0.15 minB
Product analysis     0.07 max   0.11 max     0.14 min
Titanium:                
Heat analysis         0.05 max      
Product analysis                

AC3 nuts may be made of any of the above listed material classes. Selection of the class shall be at the option of the manufacturer.

BNickel or molybdenum may be used.

Mechanical Requirements

Nuts with UNC, 8 UN, 6 UN and Coarser Pitch Threads
Grade of Nut Nominal Nut Size, Style of Nut Proof Load Stress, ksiAM/sup> Hardness
  in.   Non-Zinc-Coated NutsB Zinc-Coated NutsB Brinell Rockwell
          min   max min   max
O 1⁄4    to 11⁄2 square 69 52 103   302 B55   C32
A 1⁄4 to 11⁄2 square 90 68 116   302 B68   C32
O 1⁄4    to 11⁄2 hex 69 52 103   302 B55   C32
A 1⁄4 to 11⁄2 hex 90 68 116   302 B68   C32
B 1⁄4 to 1 hex 120 90 121   302 B69   C32
B 11⁄8 to 11⁄2 hex 105 79 121   302 B69   C32
CE 1⁄4 to 11⁄2 hex 130 130 143   352 B78   C38
DC 1⁄4 to 11⁄2 hex 135 135 159   352 B84   C38
DHD 1⁄4 to 11⁄2 hex 150 150 248   352 C24   C38
DH3 1⁄2 to 1 hex 150 150 248   352 C24   C38
A 1⁄4    to 4 heavy hex 100 75 116   302 B68   C32
B 1⁄4 to 1 heavy hex 133 100 121   302 B69   C32
B 11⁄8 to 11⁄2 heavy hex 116 87 121   302 B69   C32
CC 1⁄4 to 4 heavy hex 144 144 143   352 B78   C38
C3 1⁄4 to 4 heavy hex 144 144 143   352 B78   C38
DC 1⁄4 to 4 heavy hex 150 150 159   352 B84   C38
DHD 1⁄4 to 4 heavy hex 175 150 248   352 C24   C38
DH3 1⁄4 to 4 heavy hex 175 150 248   352 C24   C38
A 1⁄4    to 11⁄2 hex thick 100 75 116   302 B68   C32
B 1⁄4 to 1 hex thick 133 100 121   302 B69   C32
B 11⁄8 to 11⁄2 hex thick 116 87 121   302 B69   C32
DC 1⁄4 to 11⁄2 hex thick 150 150 159   352 B84   C38
DHD 1⁄4 to 11⁄2 hex thick 175 175 248   352 C24   C38
Nuts with UNF, 12   UN, and Finer Pitch Threads
O 1⁄4    to 11⁄2 hex 65 49 103   302 B55   C32
A 1⁄4 to 11⁄2 hex 80 60 116   302 B68   C32
B 1⁄4 to 1 hex 109 82 121   302 B69   C32
B 11⁄8 to 11⁄2 hex 94 70 121   302 B69   C32
DC 1⁄4 to 11⁄2 hex 135 135 159   352 B84   C38
DHD 1⁄4 to 11⁄2 hex 150 150 248   352 C24   C38
A 1⁄4    to 4 heavy hex 90 68 116   302 B68   C32
B 1⁄4 to 1 heavy hex 120 90 121   302 B69   C32
B 11⁄8 to 11⁄2 heavy hex 105 79 121   302 B69   C32
DC 1⁄4 to 4 heavy hex 150 150 159   352 B84   C38
DHD 1⁄4 to 4 heavy hex 175 150 248   352 C24   C38
A 1⁄4    to 11⁄2 hex thick 90 68 116   302 B68   C32
B 1⁄4 to 1 hex thick 120 90 121   302 B69   C32
B 11⁄8 to 11⁄2 hex thick 105 79 121   302 B69   C32
DC 1⁄4 to 11⁄2 hex thick 150 150 159   352 B84   C38
DHD 1⁄4 to 11⁄2 hex thick 175 175 248   352 C24   C38

ATo determine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread. Stress areas for UNC, UNF, and 8 UN thread series are given in Table 4.

BNon-zinc-coated nuts are nuts intended for use with externally threaded fasteners which have a plain (nonplated or noncoated) finish or have a plating or coating of insufficient thickness to necessitate overtapping the nut thread to provide assimilability. Zinc-coated nuts are nuts intended for use with externally threaded fasteners which are hot-dip zinc-coated, mechanically zinc-coated, or have a plating or coating of sufficient thickness to necessitate overtapping the nut thread to provide assimilability.

CNuts made in accordance to the requirements of Specification A194/A194M, Grade 2 or Grade 2H, and marked with their grade symbol are acceptable equivalents for Grades C heavy hex and hex and D nuts. When A194 zinc-coated inch series nuts are supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with Specification A563.

DNuts made in accordance with the requirements of Specification A194/A194M, Grade 2H, and marked with its grade symbol are an acceptable equivalent for Grade DH nuts. When A194 zinc-coated inch series nuts are supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with Specification A563.

EASTM A194 Grades 2 or 2H shall not be supplied for Grade C hex nuts unless approved by purchaser.

Thread Dimensions and Overtapping Allowances for Nuts Hot Dip Zinc Coated per Specification

Nominal Nut Size, in. and pitch Diametral Allowance, in. Pitch Diameter, in.
A min max
     
0.250-20 0.016 0.2335 0.2384
0.312-18 0.017 0.2934 0.2987
0.375-16 0.017 0.3514 0.3571
0.437-14 0.018 0.4091 0.4152
0.500-13 0.018 0.4680 0.4745
0.562-12 0.020 0.5284 0.5352
0.625-11 0.020 0.5860 0.5932
0.750-10 0.020 0.7050 0.7127
0.875-9 0.022 0.8248 0.8330
1.000-8 0.024 0.9428 0.9516
1.125-8 0.024 1.0678 1.0768
1.125-7 0.024 1.0562 1.0656
1.250-8 0.024 1.1928 1.2020
1.250-7 0.024 1.1812 1.1908
1.375-8 0.027 1.3208 1.3301
1.375-6 0.027 1.2937 1.3041
1.500-8 0.027 1.4458 1.4553
1.500-6 0.027 1.4187 1.4292
1.750-5 0.050 1.6701 1.6817
2.000-4.5 0.050 1.9057 1.9181
2.250-4.5 0.050 2.1557 2.1683
2.500-4 0.050 2.3876 2.4011
2.750-4 0.050 2.6376 2.6513
3.000-4 0.050 2.8876 2.9015
3.250-4 0.050 3.1376 3.1517
3.500-4 0.050 3.3876 3.4019
3.750-4 0.050 3.6376 3.6521
3.750-4 0.050 3.6376 3.6521
4.000-4 0.050 3.8876 3.9023

AThese allowances also apply to the minimum and maximum major and minor diameters.

Nut and Bolt Suitability Guide

Grade of BoltD Surface
FinishE		 Nominal Size, in. Grade and ANSI Nut StyleA
RecommendedB SuitableC
Hex Heavy Hex Square Hex Heavy Hex Hex Thick
A307
Grade A		 non-zinc-coated
and
zinc-coated		 1⁄4    to 11⁄2 A   A B, D, DH A, B, C, D, DH, DH3 A, B, D, DH
>11⁄2 to 2   A   AF C, D, DH, DH3  
>2 to 4   A     C, D, DH, DH3  
A307
Grade B		 non-zinc-coated
and
zinc-coated		 1⁄4    to 11⁄2   A A B, D, DH B, C, D, DH, DH3 A, B, D, DH
>11⁄2 to 2   A   AF C, D, DH, DH3  
>2 to 4   A     C, D, DH, DH3  
A325
Type 1		 non-zinc-coated 1⁄2    to 11⁄2   C     C3, D, DH, DH3  
zinc-coated 1⁄2    to 11⁄2   DH        
A325
Type 3		 non-zinc-coated 1⁄2    to 11⁄2   C3     DH3  
               
A354
Grade BC		 non-zinc-coated 1⁄4    to 11⁄2   C   D, DH C3, D, DH, DH3 D, DH
  >11⁄2 to 4   C     C3, D, DH, DH3  
zinc-coated 1⁄4    to 11⁄2   DH       DH
  >11⁄2 to 4   DH        
A354
Grade BD		 non-zinc-coated 1⁄4    to 11⁄2   DH   DH D, DH, DH3 D, DH
  >11⁄2 to 4   DH     DH3  
A394
Type 0		 zinc-coated 1⁄2    to 1 A     B, D    
               
A394
Types 1 and 2		 zinc-coated 1⁄2    to 1 DH     D    
               
A394
Type 3		 non-zinc-coated 1⁄2    to 1 DH3       C3  
               
A449
Types 1 and 2		   1⁄4    to 11⁄2 B     D, DH B, C, C3, D, DH, DH3 B, D, DH
non-zinc-coated >11⁄2 to 3   A     C, C3, D, DH, DH3  
  1⁄4    to 11⁄2   DH   D, DH D D, DH
zinc-coated >11⁄2 to 3   DH     D  
A490
Types 1 and 2		 non-zinc-coated 1⁄2    to 11⁄2   DH     DH3  
               
A490
Type 3		 non-zinc-coated 1⁄2    to 11⁄2   DH3        
               
A687 non-zinc-coated 11⁄4 to 3   D     DH, DH3  
zinc-coated 11⁄4 to 3   DH        

AThe availability of DH nuts in nominal sizes 3⁄4 in. and larger is very limited and generally available only on special orders for 50,000 pieces or more. For smaller quantities A194 Gr. 2H nuts should be considered.

B“Recommended” denotes a commercially available nut having the most suitable mechanical properties and dimensional configuration (style) that will make it possible to torque the bolt to the required load when used in combination with the nut.

C“Suitable” denotes nuts having mechanical properties that will make it possible to torque the bolt to the required load when used in combination with the nut; but, which require consideration of dimensional configuration (style) suitability and availability. Others are not suitable.

DThe term “bolt” includes all externally threaded types of fasteners.

ENon-zinc-coated nuts are nuts intended for use with externally threaded fasteners, which have a plain (nonplated or noncoated) finish or a have a plating or coating of insufficient thickness to necessitate overtapping the nut thread to provide assimilability. Zinc-coated nuts are nuts intended for use with externally threaded fasteners which are not hot-dip zinc-coated, mechanically zinc-coated, or have a plating or coating of sufficient thickness to necessitate overtapping the nut thread to provide assimilability.

FHex nuts in nominal sizes over 11⁄2 to 2 in. inclusive are not covered in the tables of tabulated sizes in ANSI B18.2.2 but are commercially available. Such nuts are suitable. See 7.2 for dimensions.