Tri-Lock Nut, Galvanized
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Tri-Lock Nut, Galvanized

Tri Lock style lock nuts are all metal prevailing torque lock nuts with a conical top and a flat bottom bearing surface with chamfered corners. The thread distortion on the top thread of the nut makes it frictionally resistant to rotation. Dimensional specifications are governed by ASME B18.2.2. Available in galvanized finish for corrosion resistance.

Governing StandardsGrade A

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.

Tri-Lock Head Marking
Grade A requires no material marking

Dimensional SpecificationsGrade A

Per ASME B18.2.2-2015
Nominal Diameter UNC UNF F G H
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1/4 0.2500 20 28 7/16 0.4380 0.4280 0.5050 0.4880 7/32 0.2260 0.2120
5/16 0.3125 18 24 1/2 0.5000 0.4890 0.5770 0.5570 17/64 0.2730 0.2580
3/8 0.3750 16 24 9/16 0.563 0.551 0.65 0.628 21/64 0.3370 0.3200
7/16 0.4375 14 20 11/16 0.6880 0.6750 0.7940 0.7680 3/8 0.3850 0.3650
1/2 0.5000 13 20 3/4 0.7500 0.7300 0.8660 0.8400 7/16 0.4480 0.4270
9/16 0.5625 12 18 7/8 0.8750 0.8610 1.0100 0.9820 31/64 0.4960 0.4730
5/8 0.6250 11 18 15/16 0.9380 0.9220 1.0830 1.0510 35/64 0.5590 0.5350
3/4 0.7500 10 16 1 1/8 1.1250 1.0880 1.2990 1.2400 41/64 0.6650 0.6170
7/8 0.8750 9 14 1 5/16 1.3120 1.2690 1.5160 1.4470 3/4 0.7760 0.7240
1 1.0000 8 14 1 1/2 1.5000 1.4500 1.7320 1.6530 55/64 0.8870 0.8310
1 1/8 1.1250 7 12 1 11/16 1.6880 1.6310 1.9490 1.8590 31/32 0.9990 0.9390
1 1/4 1.2500 7 12 1 7/8 1.8750 1.8120 2.1650 2.0660 1 1/16 1.0940 1.0300
1 3/8 1.3750 6 12 2 1/16 2.0620 1.9940 2.3820 2.2730 1 11/16 1.2060 1.3800
1 1/2 1.5000 6 12 2 1/4 2.2500 2.1750 2.5980 2.4800 1 9/32 1.3170 1.2450
1 5/8 1.6250 5.5 12 2 7/16 2.4300 2.3500 2.8050 2.6790 1 25/64 1.4160 1.3640
1 3/4 1.7500 5 12 2 5/8 2.6250 2.5380 3.0310 2.8930 1 1/2 1.5400 1.4600
1 7/8 1.8750 5 12 2 9/16 2.8130 2.7220 3.2470 3.1030 1 5/8 1.6510 1.5670
2 2.0000 4.5 12 3 3.0000 2.9000 3.4640 3.3060 1 23/32 1.7630 1.6750
  1. All dimensions are in inches.
Tri-Lock Nut, Galvanized
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Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.2188 NTLG0250000 In Stock $0.0843/EA EA
5/16 18 1/2 0.2656 NTLG0310000 In Stock $0.11774/EA EA
3/8 16 9/16 0.3281 NTLG0370000 In Stock $0.23042/EA EA
7/16 14 11/16 0.3750 NTLG0430000 3-5 Working Days $0.53786/EA EA
1/2 13 3/4 0.4375 NTLG0500000 In Stock $0.35697/EA EA
5/8 11 15/16 0.5469 NTLG0620000 In Stock $0.8441/EA EA
3/4 10 1 1/8 0.6406 NTLG0750000 In Stock $1.29184/EA EA
7/8 9 1 5/16 0.75 NTLG0870000 In Stock $2.76513/EA EA