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MANUFACTURING SPECIFICATIONS

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Standard North American DTI?s are made to ASTM F959 or F959M (metric), which define the chemical, mechanical (read compression load vs. residual DTI gap), and dimensional requirements. Complete F959 specifications are available from ASTM or you can contact Applied Bolting and we will send you a photocopy. The following is a summary of ASTM F959.

Do we make all these sizes and grades? See our LINECARD here.

Chemical Requirements(%) Product Analysis

Carbon .27 - .53
Manganese .47 - .93
Phosphorus (max) .043
Sulfur (max) .048
Silicon .13 - .37

Mechanical Requirements

DTI's are made to compress in proportion to the applied load or bolt tension. A sample of the lot must demonstrate a compression load range at a residual gap of .015" within the following values (the minimum is based on 70% of the minimum ultimate tensile strength of the applicable bolt grade, and the maximum is 20% higher than that). Note that F959 stipulates that the compression load test gap of .015" be the same whether the DTI is plain finish, galvanized, or epoxy coated. Note that the laboratory certification compression load tests for DTI's DO NOT involve bolts, but rather the tests are performed with the DTI's compressed between hardened mandrels.

The compression load test ranges stipulated by ASTM F959 are as follows:

 DTI Size – Inch Series

 Type A325 (000 lb)

 Type A490 (000 lb)
 1/2  12-14  15-18
 5/8  19-23  24-29
 3/4  28-34  35-42
 7/8  39-47  49-59
 1  51-61  64-77
 1 1/8  56-67  80-96
 1 ¼  71-85  102-122
 1 3/8  85-102  121-145
 1 ½  103-124  148-178
     

 DTI Size – Metric Series

 Type 8.8 (kN)

 Type 10.9 (kN)
 M16  91-109  114-131
 M20  142-170  179-206
 M22  176-211  221-254
 M24  205-246  257-296
 M27  267-320  334-384
 M30  326-391  408-469
 M36  475-570  595-684

Dimensions of Applied Bolting DTI's

Inch Series (Dimensions in Inches)
 SIZE A325< 

A325

A325

A490

A490

A490

A325 OR A490

(NOM DIA OF BOLT)

OD MAX

NO OF BUMPS

THICKNESS AFTER COMPRESSION

OD MAX

NO OF BUMPS

THICKNESS AFTER COMPRESSION

ID MAX

PTD MAX
 

1/2

1.187

4

0.120

1.375

5

0.120

0.527

0.788

5/8

1.375

4

0.140

1.625

5

0.140

0.658

0.956

3/4

1.625

5

0.140

1.750

6

0.160

0.790

1.125

7/8

1.875

5

0.160

2.000

6

0.180

0.921

1.294

1

2.000

6

0.180

2.250

7

0.180

1.052

1.463

1 1/8

2.250

6

0.180

2.500

7

0.180

1.183

1.631

1 1/4

2.480

7

0.180

2.750

8

0.180

1.315

1.800

1 3/8

2.750

7

0.180

3.000

8

0.180

1.446

1.969

1 1/2

3.000

8

0.180

3.250

9

0.180

1.577

2.138

Metric Series (Dimensions in mm)

Size 

Gr. 8.8

Gr. 8.8

Gr. 8.8

Gr. 10.9

Gr. 10.9

Gr. 10.9

 8.8 or 10.9

Nom Bolt Dia

OD

# Bumps

Thickness After Compression

OD

# Bumps

Thickness
After Compression

ID

PTD MAX

M16

36

4

3.4

36

4

3.8

17

25

M20

46

5

3.8

46

6

3.8

21

29

M22

50

5

3.8

50

6

4.294

23

33

M24

55

5

4.4

55

6

4.4

25

38

M27

61

6

4.4

62

7

4.4

28

43

M30

68

7

4.4

69

8

5.2

32

47

M36

81

8

5

83

9

5.2

38

56

Coatings

F959 only allows for mechanical galvanizing (to ASTM B695) and epoxy coating on top of mechanical galvanizing. Other coatings are allowed with the approval of both the manufacturer and the purchaser. Coating of DTI's by anyone other than the manufacturer is prohibited because all compression testing and certification must be done after coating.

Certifications

ASTM F959 requires that compression load certifications be issued which show the results of 27 pieces selected at random from the manufactured lot and compression tested according to the F959 Appendix A1. The compression load of all 27 pieces must be within the range stipulated above. Applied Bolting makes all product certifications available from this website by .pdf download.

DTI Markings

All DTI?s are stamped with an individual unique lot mark, which can be related to the lot number. Through the lot number, all DTI lots are traceable to date of manufacture and compression load properties.

BIG DEAL

They said it couldn't be done - to stamp a 5/16" thick 16 bump Squirter® DTI to fit an M64 (2 1/2"+) diameter bolt and to generate 1680 kN of force (!!). But we did it, and now we are continuing to perfect the Squirt action on bolts of these diameters.
Call for information.

MAKE ROOM

Applied Bolting Celebrates Opening of their New Squirter® DTI Room

LATEST PROJECTS

 
OGD-III/AGD-II FEED in Abu Dhabi
Owner: Abu Dhabi Gas Industries.
EPC: Bechtel OG&C.
Location: 110 km from Persian Gulf
Squirter® DTIs: Approx. 400,000 each