3 Alice Street
BASSENDEAN (Perth) 6054, Western Australia
Ph: +61 8 9279 5522 Fax: +61 8 9279 9386

Hofnut - The High Tension Bolting Solution

TYPICAL APPLICATIONS

  • Girth Gear Split Lines.
  • Gearbox Split Lines.
  • Pressure Vessels.
  • Hold-Down Bolts.
  • Engine Blocks.
  • * ANY LARGE BOLTING APPLICATION *

Hofnuts enable you to:

  • Tighten large nuts with hand wrenches.
  • Tighten split joints accurately to the correct tension.
  • Minimal space requirements.

Removes the need to use:

  • Hydraulic tensioning.
  • Crane wrenches.
  • Other cumbersome methods of tightening.

 

Metric HofNuts - HSN 41.
Size
Body
Jacking
Washer
OD
Thick
Size
Hex
OD
Thick
M30
53
24
8
6
53
5
M33
58
24
8
6
58
5
M36
66
32
10
8
66
5
M39
69
32
10
8
69
5
M42
75
32
10
8
75
5
M45
81
38
12
10
81
6.5
M48
85
38
12
10
85
6.5
M52
94
38
12
10
94
6.5
M56
100
38
12
10
100
6.5
M60
107
38
12
10
107
6.5
M64
113
53
16
14
113
8
M72
119
56
16
14
119
8
M80
132
56
16
14
132
8
M90
145
58
16
14
145
8
Imperial HofNuts - HSN 41.
Size
Body
Jacking
Washer
OD
Thick
Size
Hex
OD
Thick
1-1/8"
53
24
8
6
53
5
1-1/4"
58
24
8
6
58
5
1-3/8"
63
32
10
8
63
5
1-1/2"
69
32
10
8
69
5
1-5/8"
75
32
10
8
75
5
1-3/4"
79
38
12
10
79
6.5
1-7/8"
92
41
12
10
92
6.5
2"
92
41
12
10
92
6.5
2-1/4"
100
41
12
10
100
6.5
2-1/2"
113
53
16
14
113
8
2-3/4"
119
54
16
14
119
8
3"
132
54
16
14
132
8

 

STOCKED BLANKS FOR QUICK DELIVERY
Hofmann Engineering holds in stock a range of sizes of HofNuts with unthreaded bores to assist in the minimisation of lead time in the production of a customerís specific requirements. These blanks can accommodate any size and/or pitch between 33mm and 72mm.
MIS-ALIGNMENT SOLUTIONS
SPHERICAL SEATS
The use of spherical seats allows the tensioning of bolts that may be out of alignment, ensuring that your equipment remains tensioned securely. The spherical seats can be subjected to almost twice the force that can be exerted upon them by a fully tensioned HofNut, while still maintaining their own structural integrity.
BOLTING LUBRICATION
For ease of lubrication, each set of HofNuts comes with a tube of lubricant for use on the jacking bolt threads and between the tips and the washer.
SPLIT LINE CLAMPING
It is essential to keep the split line tightly closed to keep the root area of the split line tooth under compression throughout operation. This provides support for the tooth and hence prevents it from deflecting and fatigue cracking. When using HofNuts, the operating forces must first overcome the applied bolting forces before any deflection of the split line can occur.
GRADE HSN 41
STANDARD
The HSN 41 HofNuts are used for general mechanical applications. It is standard to see these nuts on the split lines of our girth gears as well as the split lines on both our newly manufactured or refurbished gearboxes. A range of sizes are kept in stock for quick delivery for a customerís requirements.
GRADE HSN 43
EXTRA HIGH TENSION
For high tension applications, we recommend our HSN 43 Grade HofNuts, which are manufactured from a higher grade of steel and contain more jacking bolts.The 43 series can apply up to 50% more force to a split line when used with the appropriately rated bolt.
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