Fastener Guide / Wall Charts

Stainless Fastener Markings

Printable shop wall chart: Stainless Fastener Markings. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.

Last reviewed 2026-09-10 · reference FG-7C0EAE · Report an error on this sheet

MarkAlloy groupCondition
F593CGroup 1 (304 family)CW1
F593DGroup 1 (304 family)CW2
F593GGroup 2 (316 family)CW1
F593HGroup 2 (316 family)CW2

Marking Meaning Strength

F593H

MarkingMeaningStrength
18-8Austenitic family name (302/303/304/305)Not a strength grade
304 / 316Alloy nameNot certification by itself
A2-70ISO 3506, 304-type, cold worked700 MPa min
A4-70ISO 3506, 316-type, cold worked700 MPa min
A4-80ISO 3506, 316-type, strain hardened800 MPa min
B8 / B8MASTM A193 304 / 316 studClass 1: 75 ksi min

A magnet is not a reliable alloy test. Stainless on stainless galls: use anti-seize or slower tightening.

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

The printed sheet

Stainless Fastener Markings

25 x 36 inch poster version

For the full-size shop poster, tell us where to send it.

See an error on this sheet?

Tell us what is wrong.

Text version of this sheet

18-8

304

316

A2-70

A4-70

A4-80

B8

B8M

18-8

304

316

A2-70

A4-70

A4-80

A193 B8

A193 B8M

Stainless alloy, ASTM condition and ISO class marks

Common cold-worked condition marks

Mark

Alloy group

Condition

F593C

Group 1 (304 family)

CW1

F593D

Group 1 (304 family)

CW2

F593G

Group 2 (316 family)

CW1

F593H

Group 2 (316 family)

CW2

Marking

Meaning

Strength

18-8

Austenitic family name (302/303/304/305)

Not a strength grade

304 / 316

Alloy name

Not certification by itself

A2-70

ISO 3506, 304-type, cold worked

700 MPa min

A4-70

ISO 3506, 316-type, cold worked

700 MPa min

A4-80

ISO 3506, 316-type, strain hardened

800 MPa min

B8 / B8M

ASTM A193 304 / 316 stud

Class 1: 75 ksi min

A magnet is not a reliable alloy test. Stainless on stainless galls: use anti-seize or slower tightening.

The Fastener App | TheFastenerApp.com

Fastener Guide reference FG-7C0EAE · thefastenerapp.com/fastener-guide/wall-charts/stainless-fastener-markings · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Metric Bolt Head MarkingsNut Grade & Identification Markings →

Scan the label, the item lands in the shopping cart

Your rep or the customer scans a barcode label or they can select items from your store. No part number to remember, no phone call to your counter, no one re-keying anything.

  • Built into the app, not a separate device or an add-on
  • Works on any phone camera, or a handheld scanner if they have one
  • Scans your competitors’ barcode labels too*
  • Customers and employees can place orders 24 hours a day, even after hours, and the orders will be waiting for you when you get there in the morning. You can choose to be notified every time an order is placed, whether you’re at the office or not. It gives you greater visibility into your company’s ordering activity.

* Simply cross the number in the system to ours, and we can walk you through the process.

See what every customer buys from you

Every account gets a category chart: share of dollars, share of times ordered and share of pieces. Your reps see what each customer buys from you, and the categories they are buying somewhere else stand out.

Share of dollars

Fasteners37%$69,879
Electrical10%$19,152
Fleet and Automotive7%$12,293
Hardware and Building Supplies5%$10,243
Tools and Equipment5%$9,811
Cutting Tools and Metalworking5%$9,740
Plumbing5%$8,865
All other25%$46,410

Share of times ordered

Fasteners44%355
Electrical12%94
Fleet and Automotive7%53
Tools and Equipment6%48
Cutting Tools and Metalworking4%36
Pneumatics4%34
Hardware and Building Supplies4%33
All other20%162

Share of pieces

Fasteners75%486,316
Fleet and Automotive6%38,905
Electrical5%31,100
Hardware and Building Supplies3%19,775
Sealing3%17,704
Abrasives3%17,251
General MRO2%16,133
All other4%23,770

Sample report from our demo store.

Sales rep territory management

The time planner splits each rep’s month by how much every customer spends. A customer that is 20% of the rep’s business gets about 35 hours a month, about 8 hours a week, and the rep’s week is laid out for them.

Share of the rep’s business

Summit Precast LLC20.2%
Brunswick Galvanizing Inc.14.6%
Talleyrand Signs LLC8.0%
Mayport Tool & Die Inc.7.8%
Eagle Mechanical LLC7.2%
Premier Electric Group5.9%
Tallahassee Packaging LLC3.7%
Coastal Maintenance Group3.3%
All others (64 customers)29.4%

Time each customer deserves

CustomerHours a monthHours a week
Summit Precast LLC35.08.1
Brunswick Galvanizing Inc.25.35.8
Talleyrand Signs LLC13.93.2
Mayport Tool & Die Inc.13.53.1
Eagle Mechanical LLC12.52.9
Premier Electric Group10.22.4
Tallahassee Packaging LLC6.41.5
Coastal Maintenance Group5.71.3
All others (64 customers)51.011.8

Sample plan from our demo store: 173 hours a month, all selling time.

Nearly 3,000 real product photographs, covering more than 27,000 SKUs.

We had a professional photographer come in and spend weeks in our warehouse, photographing and producing real, high-resolution photos of many of our products. This work is ongoing, and many more products will be added. Right now the photographs cover more than 27,000 SKUs. We also have AI image generation capabilities.

Not ready yet? Send yourself the details.

Leave your email and we will send you what your own store would look like, what it costs, and what we would need from your system. No call unless you ask for one.

Or call 904-422-1273. We never sell or share your details.