Nut Grade & Identification Markings

Printable shop wall chart: Nut Grade & Identification 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-DA2107 · Report an error on this sheet

Nut	Marking	Pairs with
ASTM A563 Grade A	None required	A307
ASTM A563 DH	DH	A325 galvanized, A490, A354 BD
ASTM A563 C3 / DH3	C3 / DH3	Type 3 weathering structural
ASTM A194 2H	2H	A193 B7
ASTM A194 2HM	2HM	A193 B7M
ASTM A194 8 / 8M	8 / 8M	A193 B8 / B8M
SAE J995 Grade 5 / 8	Grade marks per SAE J995	SAE Grade 5 / 8
ISO 898-2 class 8 / 10 / 12	8 / 10 / 12	8.8 / 10.9 / 12.9

Heavy hex is a shape, not a grade. A weaker nut on a stronger bolt strips first.

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

The printed sheet

25 x 36 inch poster version

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

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Tell us what is wrong.

Text version of this sheet

A563 DH

A194 2H

ISO CLASS 8

ISO CLASS 10

Nut grades are separate from bolt grades · the nut mark sets the nut strength

Nut

Marking

Pairs with

ASTM A563 Grade A

None required

A307

ASTM A563 DH

A325 galvanized, A490, A354 BD

ASTM A563 C3 / DH3

C3 / DH3

Type 3 weathering structural

ASTM A194 2H

A193 B7

ASTM A194 2HM

2HM

A193 B7M

ASTM A194 8 / 8M

8 / 8M

A193 B8 / B8M

SAE J995 Grade 5 / 8

Grade marks per SAE J995

SAE Grade 5 / 8

ISO 898-2 class 8 / 10 / 12

8 / 10 / 12

8.8 / 10.9 / 12.9

Heavy hex is a shape, not a grade. A weaker nut on a stronger bolt strips first.

The Fastener App | TheFastenerApp.com

Fastener Guide reference FG-DA2107 · thefastenerapp.com/fastener-guide/wall-charts/nut-grade-and-identification-markings · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

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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

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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

Customer	Hours a month	Hours a week
Summit Precast LLC	35.0	8.1
Brunswick Galvanizing Inc.	25.3	5.8
Talleyrand Signs LLC	13.9	3.2
Mayport Tool & Die Inc.	13.5	3.1
Eagle Mechanical LLC	12.5	2.9
Premier Electric Group	10.2	2.4
Tallahassee Packaging LLC	6.4	1.5
Coastal Maintenance Group	5.7	1.3
All others (64 customers)	51.0	11.8

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

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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.