DH Anco Pin-Lock Nut, Galvanized
Choose Favorites List

DH Anco Pin-Lock Nut, Galvanized

Anco lock nuts are manufactured from heavy hex ASTM A563 Grade DH nuts that have an added stainless steel ratchet pin. The ratchet pin slides along the threads as the nut is threaded onto the bolt, which prevents the nut from backing off. The Anco style lock nut has an added feature in that the ratchet pin can be bent so that the nut can be removed, if needed. Dimensional specifications are governed by ASME B18.2.2. Available in hot dipped galvanized finish for corrosion resistance.

Governing StandardsGrade DH

ASTM A563 Covers the 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.
ASME B18.2.2 Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Grade DH Head Marking
Grade DH Material Marking

Mechanical PropertiesGrade DH

Carbon & Alloy Steel Per ASTM A563-2015
Diameter Proof Load Stress (1) Core Hardness
ksi Rockwell
Non Zinc-
Coated (2)
Zinc-
Coated (2)
Min Max
1/4" thru 4" (3) 175 150 C24 C38
  1. 1. To determine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread.
  2. 2. Non-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 assemblability. 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 assemblability.
  3. 3. Nuts 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.

Chemical PropertiesGrade DH

Per ASTM A563-2015
Grade Material Carbon Manganese Phosphorus Sulfur
% by weight % by weight % by weight % by weight
DH (1) Carbon & Alloy Steel 0.20-0.55 0.60 0.04 0.05
  1. 1. For Grade DH a sulfur content of 0.05 – 0.15 % is acceptable provided the manganese is 1.35 % min.

Dimensional SpecificationsGrade DH

Heavy hex nut dimensions
Per ASME B18.2.2-2015
Nominal Diameter UNC F G H
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1/4 0.250 20 1/2 0.500 0.488 0.577 0.556 15/64 0.250 0.218
5/16 0.313 18 9/16 0.562 0.546 0.650 0.220 19/64 0.314 0.280
3/8 0.375 16 11/16 0.688 0.669 0.794 0.763 23/64 0.377 0.341
7/16 0.438 14 3/4 0.750 0.728 0.866 0.830 27/64 0.441 0.403
1/2 0.500 13 7/8 0.875 0.850 1.010 0.990 31/64 0.504 0.464
9/16 0.563 12 15/16 0.938 0.909 1.083 1.037 35/64 0.568 0.526
5/8 0.625 11 1 1/16 1.062 1.031 1.227 1.175 39/64 0.631 0.587
3/4 0.750 10 1 1/4 0.250 1.212 1.443 1.382 47/64 0.758 0.710
7/8 0.875 9 1 7/16 1.438 1.394 1.660 1.589 55/64 0.885 0.833
1 1.000 8 1 5/8 1.625 1.575 1.876 1.796 63/64 1.012 0.956
1 1/8 1.125 7 1 13/16 1.812 1.756 2.093 2.002 1 7/64 1.139 1.079
1 1/4 1.250 7 2 2.000 1.380 2.309 2.209 1 7/32 1.251 1.187
1 3/8 1.375 6 2 3/16 2.188 2.119 2.526 2.416 1 11/32 1.378 1.310
1 1/2 1.500 6 2 3/8 2.375 2.300 2.742 2.622 1 15/32 1.505 1.433
1 5/8 1.625 5 1/2 2 9/16 2.562 2.481 2.959 2.828 1 19/32 1.632 1.556
1 3/4 1.750 5 2 3/4 2.750 2.662 3.175 3.035 1 23/32 1.759 1.679
1 7/8 1.875 5 2 15/16 2.938 2.844 3.392 3.242 1 27/32 1.886 1.802
2 2.000 4 1/2 3 1/8 3.125 3.025 3.608 3.449 1 31/32 2.013 1.925
2 1/4 2.250 4 1/2 3 1/2 3.500 3.388 4.041 3.862 2 13/64 2.251 2.155
2 1/2 2.500 4 3 7/8 3.875 3.750 4.474 4.275 2 29/64 2.505 2.401
2 3/4 2.750 4 4 1/4 4.250 4.112 4.907 4.688 2 45/64 2.759 2.647
3 3.000 4 4 5/8 4.625 4.475 5.340 5.102 2 61/64 3.013 2.893
3 1/4 3.250 4 5 5.000 4.838 5.774 5.515 3 3/16 3.252 3.124
3 1/2 3.500 4 5 3/8 5.375 5.200 6.207 5.928 3 7/16 3.506 3.370
3 3/4 3.750 4 5 3/4 5.750 5.562 5.562 6.341 3 11/16 3.670 3.616
4 4.000 4 6 1/8 6.125 5.925 5.925 6.755 3 15/16 4.014 3.862
  1. All dimensions are in inches.
DH Anco Pin-Lock Nut, Galvanized
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/2 13 7/8 0.4844 NANC0500000 In Stock $1.07669/EA EA
5/8 11 1 1/16 0.6094 NANC0620000 In Stock $1.14219/EA EA
3/4 10 1 1/4 0.7344 NANC0750000 In Stock $1.77657/EA EA
7/8 9 1 7/16 0.8594 NANC0870000 In Stock $2.91203/EA EA
1 8 1 5/8 0.9844 NANC1000000 In Stock $3.59365/EA EA
1 1/8 7 1 13/16 1.1094 NANC1120000 In Stock $4.93537/EA EA
1 1/4 7 2 1.2188 NANC1250000 In Stock $7.3459/EA EA
1 1/2 6 2 3/8 1.4688 NANC1500000 In Stock $12.28202/EA EA