A320 L7 All Thread Rod
Choose Favorites List

A320 L7 All Thread Rod

ASTM A320 Grade L7 all thread rod is manufactured from alloy steel, quenched and tempered. Dimensional specifications are governed by ASME B18.31.3. Inch series fasteners meeting ASTM A320 Grade L7 specifications are typically used to secure valves, flanges and fittings in low temperature applications. A320 L7 all thread rod having diameters above 1" are most common 8UN (8 threads per inch).

Governing StandardsGrade L7

ASTM A320 Covers alloy steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for low-temperature service.
ASME B18.31.3 Covers the general and dimensional data for inch series threaded rods.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Mechanical PropertiesGrade L7

AISI 4140/4142 Steel, Quenched & Tempered Per ASTM A320/A320M-15a
Diameter Tempering
Yield Strength,
0.2% offset
Elongation in
2 in. or 50 mm
of Area
Min Min ksi Min ksi Min % Min % Max
2 1/2" and under (1) 1100F 125 105 16 50 321 HBW or 35 HRC
  1. 1. These upper diameter limits were established on the basis that these were the largest sizes commonly available that consistently met specification property limits. They are not intended as absolute limits beyond which bolting materials could no longer be certified to the specification.

Chemical PropertiesGrade L7

Per ASTM 320/A320M-15a
Grade Carbon Manganese Phosphorus Sulfur Silicon Chromium Molybdenum
% by weight % by weight % by weight % by weight % by weight % by weight % by weight
L7 0.38-0.48 0.75-1.00 0.035 max 0.040 max 0.15-0.35 0.80-1.10 0.15-0.25
A320 L7 All Thread Rod
Diameter Thread Pitch Length Origin Item # Availability Price Quantity UOM
1/2 13 12 FT Domestic RGB70500000-U In Stock $3.08435/FT FT
5/8 11 12 FT Unrestricted Origin RGL70620000 In Stock $4.86392/FT FT
3/4 10 12 FT Unrestricted Origin RGL70750000 In Stock $5.52434/FT FT
7/8 9 12 FT Unrestricted Origin RGL70870000 In Stock $8.66563/FT FT
1 8 12 FT Unrestricted Origin RGL71000000 In Stock $10.28903/FT FT
1 1/8 8 12 FT Unrestricted Origin RGL71120000 In Stock $10.12015/FT FT
1 1/4 8 12 FT Unrestricted Origin RGL71250000 In Stock $13.48988/FT FT