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).

Technical Data

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 Temperature	Tensile Strength	Yield Strength, 0.2% offset	Elongation in 2 in. or 50 mm	Reduction of Area	Hardness
Diameter	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. 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
Grade	% 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

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Diameter	Thread Pitch	Length	Origin	Item #	Availability	Price	Quantity
5/8	11	12 FT	Unrestricted Origin	RGL70620000	5-7 Working Days	$3.86051/FT	FT	FT
3/4	10	12 FT	Unrestricted Origin	RGL70750000	5-7 Working Days	$7.6047/FT	FT	FT
7/8	9	12 FT	Unrestricted Origin	RGL70870000	5-7 Working Days	$6.02704/FT	FT	FT
1	8	12 FT	Unrestricted Origin	RGL71000000	In Stock	$8.75012/FT	FT	FT
1 1/8	8	12 FT	Unrestricted Origin	RGL71120000	5-7 Working Days	$14.06123/FT	FT	FT
1 1/4	8	12 FT	Unrestricted Origin	RGL71250000	In Stock	$13.17222/FT	FT	FT

A320 L7 All Thread Rod

Technical Data

Tab 1

Governing StandardsGrade L7

Tab 2

Mechanical PropertiesGrade L7

Tab 3

Chemical PropertiesGrade L7

Product Specification

Diameter

Thread Pitch

Thread Type