AnchorAll Earth Anchor Systems
Gene Fransee & Son Nursery & Landscape Co.

Manta Ray Earth Anchor Systems

 

MANTA RAY ANCHOR SYSTEMS
HOLDING CAPACITIES
 KIP/KN(7)

Common Soil Type Description

Geological Soil Classification

Typical Blow Count "N" per ASTM-D1586

MR-88
3' / .9m

MR-4
7' / 2.1 m

MR-3
7' / 2.1 m

MR-2
7' / 2.1 m

MR-1
7' / 2.1 m

MR-SR
7' / 2.1 m

Sound Hard Rock
Un-weathered		 Granite, Basalt, Massive Limestone

N/A

KIPS

KN

5
(1,3)

22

KIPS

KN

8
(1,3)

36

KIPS

KN

10
(1,3)

44

KIPS

KN

20
(1,3)

88

KIPS

KN

20
(1,3,5)

88

KIPS

KN

20
(1,3,5)

88

Very Dense and Cemented Sands; Coarse Gravel and Cobbles Caliche, (Nitrate-bearing Gravel/Rock)

60-100+

5
(1,3)

22

8
(1,3)

36

10
(1,3)

44

20
(1,3)

88

20
(1,3,5)

88

20
(1,3,5)

88

Dense Fine Sand; Very hard Silts and Clays Basal Till: Boulder Clay Cliche; Weathered Rock

45-60

5
(2,3)

22

8
(2,3)

36

10
(2,3)

44

18-20
(2,3)

79-88

20
(1,3,5)

88

20
(1,3,5)

88

Dense Clays, Sands and Gravel; Hard Silts and Clays Glacial Till; Weathered Shales, Schist Gneiss Siltstone

35-50

4-5
(2,3)

18-22

5.5-8
(4)

24-36

10
(3)

44

15-18
(4)

66-79

20
(2,3)

88

20
(2,3,5)

88

Medium Dense Sandy Gravel; Very Stiff to Hard Silts and Clays Glacial Till; Hardpan

24-40

3-4
(4)

13-18

4.5-5.5
(4)

20-24

10
(3,4)

44

12-15
(4)

53-66

8-20
(3,4)

79-88

20
(2,3)

88

Medium Dense Coarse Sand and Sandy Gravel; Stiff to Very Stiff Silts and Clays Saprolites Residual Soils

14-25

2-3
(4)

9-13

3.5-4.5
(4)

15-20

7-9
(4)

31-40

9-125
(4)

40-53

15-20
(3,4)

66-88

18-20
(3,4)

79-88

Loose to Medium Dense Fine to Coarse Sand; Firm to Stiff Clays and Silts Dense Hydraulic Fill; Compacted Fill; Residual Soils

7-14

1.5-2.5
(4)

7-11

2.5-4
(4)

22

5-8
(4)

22-36

7-10
(4)

31-44

10-15
(4)

44-66

14-18
(4)

62-79

Loose Fine Sand; Alluvium; Soft-Firm Clays; Varied Clays; Fill Flood Plain Soils; Lake Clays; Adobe; Gumbo Fill

4-8

0.9-1.5
(4,6)

4-7

1.5-2.5
(4,6)

7-11

3-5
(4,6)

13-22

5-8
(4,6)

22-36

8-12
(4,6)

37-53

9-14
(4,6)

40

Peat, Organic Silts; Inundates Silts Fly Ash Miscellaneous Fill; Swamp Marsh

0-5

0.2-0.9
(4,6)

0.9-4

0.3-1.5
(4,6)

1.3-7

0.8-3
(4,6)

3.5-13

2-5
(4,6)

9-22

3-8
(4,6)

13-37

4-12
(4,6)

18-53


 

1 = Drilled hole required to install.
2 = Installation may be difficult. Pilot hole may be required.
3 = Holding capacity limited by structural rating of anchors.
4 = Holding capacity limited by soil structure.
5 = Not recommended in these soils.
6 = Wide variation in soil properties reduces prediction accuracy. Pre-construction field test recommended.
7 = Holding capacity in KIPS and KN after anchor locking with no significant movement and no safety factor.

Use this chart for estimation only. True capacity must be tested with anchor locker.

NOTE: All underground work requires proper safety and location procedures. Do not install an anchor until you know what is below the surface. It is imperative in all cases that all anchors are fully anchor locked before being put into service.

For more information on Manta RayŽ anchor products, email

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