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Techs & Specs

Grade markings are standardized symbols denoting the combination of the fastener's base material, its strength properties, its performance capabilities, and the engineering standard against which it is produced.

Markings on bolts and screws are usually located on the top of their heads; those on studs on their ends; and on nuts on their top face.

BOLTS

              TENSILE & YIELD STRENGTH BOLTGUIDE

Material

Diameter

Minimum PSI

Tensile Strength

Minimum PSI

Yield Strength

Grade 2 Steel

1/4" to 3/4"

74,000

57,000

 

7/8" to 1-1/2"

60,000

36,000

 

1 5/8" to 4"

60,000

--

Grade 5 Steel

1/4" to 1"

120,000

92,000

 

1 1/8" to 1 1/2"

105,000

81,000

 

1 5/8" to 3"

90,000

58,000

Grade 8 Steel

1/4" to 1 1/2"

150,000

130,000

 

1 5/8” & Above

--

--

18-8 Stainless Steel

1/4” to 1 1/2"

75,000

30, 000

316 Stainless Steel

1/4" to 1 1/2"

75,000

30,000

400 Monel

1/4" to 1 1/2"

75,000

30,000

Brass

All

57,000

--

Silicone Bronze

All

75,000

45,000

2024 Aluminum

All

75,000

11,000

 

Tensile Stress Area

Diameter

UNC

UNF

1/4"

.0318

.0364

5/16”

.0524

.0580

3/8”

.0775

.0878

7/16”

.1063

.1187

1/2"

.1419

.1599

5/8”

.226

.256

3/4"

.334

.373

7/8”

.462

.509

1”

.606

.663

1 1/4"

.969

1.073

1 1/2"

1.405

1.581

NOTE: 
(The values listed are for reference purposes only. Check with an engineer for job site applicable loads.)


STAINLESS STEEL: 304, 316, 410

GRADE

GENERAL
DESCRIPTION OF MATERIAL

SPECIFICATIONS
COVERING RAW
MATERIALS
REQUIREMENTS

CHEMICAL COMPOSITION
(MIN / MAX LIMITS GIVEN)

 

C

Mn

P

S

Si

Cu

Mo

NI

Cr

other

303

Austenitic Stainless Steel

ASTM A276 TYPE 303
QQ-N-764 CLASS 303
AISI 303

0.15

2.00

0.20

.015

min

1.00

--

.060

8.00
To
10.00

17.00
To
19.00

--

304

Austenitic Stainless Steel

ASTM A276 TYPE 304
QQ-S-763 CLASS 304
AISI 304

0.08

2.00

0.045

0.030

1.00

--

--

8.00
TO
12.00

18.00
TO
20.00

--

316

Austenitic Stainless Steel

ASTM A276 TYPE 316
QQ-S-763 CLASS 316
AISI 316

0.06

2.00

0.045

0.030

1.00

--

2.00
To
3.00

10.00
To
14.00

16.00
To
18.00

--

410

Martensitic
Stainless Steel

ASTM A276 TYPE 410
QQ-S-763 CLASS 410
AISI 410

0.15

1.00

0.040

0.030

1.00

--

--

--

11.50
To
13.50

--

Legend:

ASTM – American Society for Testing and Materials
AISI – American Iron and Steel Institute
QQ-X-XXX – Federal Government

Stainless steel fastener materials are identified as the B8 class of alloys and are identified in the ASTM Specification A193/193M (Standard Specifications for Alloy Steel and Stainless Steel Bolting materials for high temperature service).

A typical of the austenitic group is Type 304, which contains nominally 18% chromium and 8% nickel; hence the 18-8 name.

For further guidance on material selection, consult with an engineer.