Fastener Guide / Technical Reference

ASTM A320 Low-Temperature Bolting

A320 is the cold-service companion to A193: alloy and stainless studs for pressure equipment, with impact testing to prove toughness at low temperature.

Last reviewed 2026-09-10 · Governing standard: ASTM A320/A320M-24; ASTM A194/A194M-24 · reference FG-A154F6 · Report an error on this sheet

Common grades

GradeMaterialTensile / yield (min)Impact test
L7Cr-Mo alloy, Q&T125 / 105 ksi (to 2-1/2 in)Charpy at -150 F
L7MCr-Mo, hardness-controlled100 / 80 ksiCharpy at -100 F
L43Ni-Cr-Mo alloy125 / 105 ksi (to 4 in)Charpy at -150 F
B8 / B8M304 / 316 stainlessper classAs specified

These tables carry the same figures as the printed sheet below.

The printed sheet

ASTM A320 Low-Temperature Bolting

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Text version of this sheet

ASTM A320 / A320M · low-temperature bolting

FIELD IDENTIFICATION

What it is

A320 is the cold-service companion to A193: alloy and stainless studs for pressure equipment, with

impact testing to prove toughness at low temperature.

L7

Stud bolt with nuts; grade marked on stud end

Common grades

Grade

Material

Tensile / yield (min)

Impact test

L7

Cr-Mo alloy, Q&T

125 / 105 ksi (to 2-1/2 in)

Charpy at -150 F

L7M

Cr-Mo, hardness-controlled

100 / 80 ksi

Charpy at -100 F

L43

Ni-Cr-Mo alloy

125 / 105 ksi (to 4 in)

Charpy at -150 F

B8 / B8M

304 / 316 stainless

per class

As specified

Key points

If the service can reach -20 F or colder, A193 B7 is the wrong reflex.

Governing standards: ASTM A320/A320M-24; ASTM A194/A194M-24. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard

always take precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-A154F6 · thefastenerapp.com/fastener-guide/technical-reference/astm-a320-low-temperature-bolting · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← ASTM F959 Direct Tension Indicator WashersAerospace Fasteners - AN / MS / NAS →

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