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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 NutComposition, %
 AnalysisCarbonManganese, minPhosphorus, maxSulfur, max
      
O, A, B, Cheat0.55 max 0.120.15A
 product0.58 max 0.13B 
DCheat0.55 max0.300.040.05
 product0.58 max0.270.0480.058
 heat0.20-0.550.600.040.05
DHCproduct0.18-0.580.570.0480.058

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

ElementComposition, %
 Classes for Grade C3 NutsAGrade DH3
 NABCDEFNuts
Carbon:        
Heat analysis 0.33-0.400.38-0.480.15-0.250.15-0.250.20-0.250.20-0.250.20-0.53
Product analysis 0.31-0.420.36-0.500.14-0.260.14-0.260.18-0.270.19-0.260.19-0.55
Manganese:        
Heat analysis 0.90-1.200.70-0.900.80-1.350.40-1.200.60-1.000.90-1.200.40 min
Product analysis 0.86-1.240.67-0.930.76-1.390.36-1.240.56-1.040.86-1.240.37 min
Phosphorus:        
Heat analysis0.07-0.150.040 max0.06-0.120.035 max0.040 max0.040 max0.040 max0.046 max
Product analysis0.07-0.1550.045 max0.06-0.1250.040 max0.045 max0.045 max0.045 max0.052 max
Sulfur:        
Heat analysis0.050 max0.050 max0.050 max0.040 max0.050 max0.040 max0.040 max0.050 max
Product analysis0.055 max0.055 max0.055 max0.045 max0.055 max0.045 max0.045 max0.055 max
Silicon:        
Heat analysis0.20-0.900.15-0.350.30-0.500.15-0.350.25-0.500.15-0.350.15-0.35 
Product analysis0.15-0.950.13-0.370.25-0.550.13-0.370.20-0.550.13-0.370.13-0.37 
Copper:        
Heat analysis0.25-0.550.25-0.450.20-0.400.20-0.500.30-0.500.30-0.600.20-0.400.20 min
Product analysis0.22-0.580.22-0.480.17-0.430.17-0.530.27-0.530.27-0.630.17-0.430.17 min
Nickel:        
Heat analysis1.00 max0.25-0.450.50-0.800.25-0.500.50-0.800.30-0.600.20-0.400.20 minB
Product analysis1.03 max0.22-0.480.47-0.830.22-0.530.47-0.830.27-0.630.17-0.430.17 min
Chromium:        
Heat analysis0.30-1.250.45-0.650.50-0.750.30-0.500.50-1.000.60-0.900.45-0.650.45 min
Product analysis0.25-1.300.42-0.680.47-0.830.27-0.530.45-1.050.55-0.950.42-0.680.42 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 NutNominal Nut Size,Style of NutProof Load Stress, ksiAM/sup>Hardness
 in. Non-Zinc-Coated NutsBZinc-Coated NutsBBrinellRockwell
     min maxmin max
O1⁄4    to 11⁄2square6952103 302B55 C32
A1⁄4 to 11⁄2square9068116 302B68 C32
O1⁄4    to 11⁄2hex6952103 302B55 C32
A1⁄4 to 11⁄2hex9068116 302B68 C32
B1⁄4 to 1hex12090121 302B69 C32
B11⁄8 to 11⁄2hex10579121 302B69 C32
CE1⁄4 to 11⁄2hex130130143 352B78 C38
DC1⁄4 to 11⁄2hex135135159 352B84 C38
DHD1⁄4 to 11⁄2hex150150248 352C24 C38
DH31⁄2 to 1hex150150248 352C24 C38
A1⁄4    to 4heavy hex10075116 302B68 C32
B1⁄4 to 1heavy hex133100121 302B69 C32
B11⁄8 to 11⁄2heavy hex11687121 302B69 C32
CC1⁄4 to 4heavy hex144144143 352B78 C38
C31⁄4 to 4heavy hex144144143 352B78 C38
DC1⁄4 to 4heavy hex150150159 352B84 C38
DHD1⁄4 to 4heavy hex175150248 352C24 C38
DH31⁄4 to 4heavy hex175150248 352C24 C38
A1⁄4    to 11⁄2hex thick10075116 302B68 C32
B1⁄4 to 1hex thick133100121 302B69 C32
B11⁄8 to 11⁄2hex thick11687121 302B69 C32
DC1⁄4 to 11⁄2hex thick150150159 352B84 C38
DHD1⁄4 to 11⁄2hex thick175175248 352C24 C38
Nuts with UNF, 12   UN, and Finer Pitch Threads
O1⁄4    to 11⁄2hex6549103 302B55 C32
A1⁄4 to 11⁄2hex8060116 302B68 C32
B1⁄4 to 1hex10982121 302B69 C32
B11⁄8 to 11⁄2hex9470121 302B69 C32
DC1⁄4 to 11⁄2hex135135159 352B84 C38
DHD1⁄4 to 11⁄2hex150150248 352C24 C38
A1⁄4    to 4heavy hex9068116 302B68 C32
B1⁄4 to 1heavy hex12090121 302B69 C32
B11⁄8 to 11⁄2heavy hex10579121 302B69 C32
DC1⁄4 to 4heavy hex150150159 352B84 C38
DHD1⁄4 to 4heavy hex175150248 352C24 C38
A1⁄4    to 11⁄2hex thick9068116 302B68 C32
B1⁄4 to 1hex thick12090121 302B69 C32
B11⁄8 to 11⁄2hex thick10579121 302B69 C32
DC1⁄4 to 11⁄2hex thick150150159 352B84 C38
DHD1⁄4 to 11⁄2hex thick175175248 352C24 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 pitchDiametral Allowance, in.Pitch Diameter, in.
Aminmax
   
0.250-200.0160.23350.2384
0.312-180.0170.29340.2987
0.375-160.0170.35140.3571
0.437-140.0180.40910.4152
0.500-130.0180.46800.4745
0.562-120.0200.52840.5352
0.625-110.0200.58600.5932
0.750-100.0200.70500.7127
0.875-90.0220.82480.8330
1.000-80.0240.94280.9516
1.125-80.0241.06781.0768
1.125-70.0241.05621.0656
1.250-80.0241.19281.2020
1.250-70.0241.18121.1908
1.375-80.0271.32081.3301
1.375-60.0271.29371.3041
1.500-80.0271.44581.4553
1.500-60.0271.41871.4292
1.750-50.0501.67011.6817
2.000-4.50.0501.90571.9181
2.250-4.50.0502.15572.1683
2.500-40.0502.38762.4011
2.750-40.0502.63762.6513
3.000-40.0502.88762.9015
3.250-40.0503.13763.1517
3.500-40.0503.38763.4019
3.750-40.0503.63763.6521
3.750-40.0503.63763.6521
4.000-40.0503.88763.9023

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

Nut and Bolt Suitability Guide

Grade of BoltDSurface
FinishE		Nominal Size, in.Grade and ANSI Nut StyleA
RecommendedBSuitableC
HexHeavy HexSquareHexHeavy HexHex Thick
A307
Grade A		non-zinc-coated
and
zinc-coated		1⁄4    to 11⁄2A AB, D, DHA, B, C, D, DH, DH3A, B, D, DH
>11⁄2 to 2 A AFC, 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 AAB, D, DHB, C, D, DH, DH3A, B, D, DH
>11⁄2 to 2 A AFC, D, DH, DH3 
>2 to 4 A  C, D, DH, DH3 
A325
Type 1		non-zinc-coated1⁄2    to 11⁄2 C  C3, D, DH, DH3 
zinc-coated1⁄2    to 11⁄2 DH    
A325
Type 3		non-zinc-coated1⁄2    to 11⁄2 C3  DH3 
        
A354
Grade BC		non-zinc-coated1⁄4    to 11⁄2 C D, DHC3, D, DH, DH3D, DH
 >11⁄2 to 4 C  C3, D, DH, DH3 
zinc-coated1⁄4    to 11⁄2 DH   DH
 >11⁄2 to 4 DH    
A354
Grade BD		non-zinc-coated1⁄4    to 11⁄2 DH DHD, DH, DH3D, DH
 >11⁄2 to 4 DH  DH3 
A394
Type 0		zinc-coated1⁄2    to 1A  B, D  
        
A394
Types 1 and 2		zinc-coated1⁄2    to 1DH  D  
        
A394
Type 3		non-zinc-coated1⁄2    to 1DH3   C3 
        
A449
Types 1 and 2		 1⁄4    to 11⁄2B  D, DHB, C, C3, D, DH, DH3B, D, DH
non-zinc-coated>11⁄2 to 3 A  C, C3, D, DH, DH3 
 1⁄4    to 11⁄2 DH D, DHDD, DH
zinc-coated>11⁄2 to 3 DH  D 
A490
Types 1 and 2		non-zinc-coated1⁄2    to 11⁄2 DH  DH3 
        
A490
Type 3		non-zinc-coated1⁄2    to 11⁄2 DH3    
        
A687non-zinc-coated11⁄4 to 3 D  DH, DH3 
zinc-coated11⁄4 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.