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Hexagonal Fasteners: 12.9 Quality

Hexagonal fasteners from BYG have specific characteristics including being made of fine grade steel, having forged heads that are 20% higher than standard and laminated threads for better holding. They are available in various thread types and grades ranging from 5.6 to 12.9 quality, with the 12.9 grade indicating a minimum pretensile strength of 170,000 PSI. Using BYG fasteners with their heavy duty nuts and washers provides a complete fastening system for maximum resistance and durability.

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28 views1 page

Hexagonal Fasteners: 12.9 Quality

Hexagonal fasteners from BYG have specific characteristics including being made of fine grade steel, having forged heads that are 20% higher than standard and laminated threads for better holding. They are available in various thread types and grades ranging from 5.6 to 12.9 quality, with the 12.9 grade indicating a minimum pretensile strength of 170,000 PSI. Using BYG fasteners with their heavy duty nuts and washers provides a complete fastening system for maximum resistance and durability.

Uploaded by

marcusdba
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Page 1

Fasteners

12.9 Quality

Hexagonal
Fasteners

Pretensile Strength
170.000 P.S.I. (120 Kg/mm2)
Elastic Load Limit
2
140.000 P.S.I. (100 Kg/mm )
Rockwell Hardness
C35-38

Hexagonal Fasteners

Characteristics of
BYG Hexagonal Bolts

Coarse Thread Bolts (U.S.S. COARSE UNC-2A)


Fine Thread Bolts (S.A.E. FINE UNF-2A)
Coarse Metric Thread Bolts Norms DIN 931 / 933

Higher Head

Fine Metric Thread Bolts According to DIN 960 / 961

Heads 20% higher than American Standard B 18.2.1. Providing


increased fatigue life and maximum holding force for the nut.

Hexagonal Nuts
Self-Locking Nuts

SAE Grade Brands

Heavy Duty Flat Washers

The radial marks indicate the grade of SAE strength for better
identification. Six marks on the head guarantee the quality
grade 12.9 / 35-38 Rockwell (113/124 Kg./mm2)

Heavy Duty Spring Washers

Min. Pretensile
Strength
pounds / inch2

Quality of Fasteners

Forged Head
Provides a correct flow of the steel fibre reducing the fatigue
points ensuring major resistance to bumps and an even
distribution of the weight. The edges do not round off and the
bolts can be reused. The washer sits perfectly below the head.

180
170
160
150
140

Laminated Thread

130

Laminated with the maximum precision they provide a better


hold eliminating the risk of breaking.

120
110

Fine Grade Steel

100

Provides a more even


microstructure improving
its resistance with a lower
percentage of breakage.

90
80
70

12.9

3/5/2011

QUALITY
5.6

Kg
mm.

6
8
10
12
14
16
18
20
24

0,600
1,090
1,740
2,530
3,450
4,710
5,760
7,350
10,590

QUALITY
8.8

Kg
mm.
4
5
6
8
10
12
14
16
18

0,560
0,910
1,290
2,340
3,710
5,400
7,350
10,000
12,300

10.9

8.8

QUALITY
10.9

Kg.
mm.
4
5
6
8
10
12
14
16

0,790
1,280
1,810
3,300
5,200
7,500
10,350
14,130

5.6

QUALITY
12.9

Kg
mm.
5
6
8
10
12
14
16

1,530
2,170
3,950
6,250
9,100
12,400
16,900

Complete
Fastening
System
For better assurance and
to get the maximum
resistance and duration
use BYG HD nuts and
washers in combination
with BYG fasteners.

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