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Flexnuts
 
 
Flexnuts are used in combination with Superbolt tensioners and are designed to flex out at the bottom and flex in toward the top of the nut. This distributes the bolt load along many threads, adds elasticity, and prevents stress concentrations in the first few threads.
 
For through hole applications we have developed the Superbolt flexnut, which is a reactive nut that is able to flex elastically. Putting a Flexnut gives the same advantages as the MJT on the reactive side. Under load they flex at the bottom and at the top. This helps relieve stress concentrations and increases the fatigue life of the bolt. Since flexnuts are reactive nuts to be used opposite our tensioners, they are never torqued directly to achieve preload.

Advantages with Superbolt Flexnuts:
 
  •   Under load they ensure an equal load distribution on the thread of the bolt/stud.
  •   Adds elasticity in the joint.
  •   Increases the fatigue life of the bolt/stud.
 
 
SX8 - Standard flexnut
 
For through hole applications we have developed the Superbolt flexnut, which is a reactive nut that is able to flex elastically.
 
Description:
 
Flexnuts are used in combination with our other products. They are designed to flex out at the bottom and flex in toward the top of the nut. This distributes the bolt load along many threads, adds elasticity, and prevents stress concentrations in the first few threads. This reduces the possibility of stud breakage.
 
Selection Guide:
 
  •   SX8 - Standard flexnut
  •   Dimension range: M20-M160 (3/4" - 6")
  •   Approx. bolt stress depending on size: 450 to 700 N/mm2 (60 to 100 ksi)
  •   Temperature range: -10 to 250oC (0 to 500oF)
  •   Surface treatment: optional
  •   Application samples: Reactive nut for through hole applications. Adds elasticity to bolted joints. Highly recommended for short clamp lengths.
  •   Notes: In combination with MT nut-style tensioners or SB8 bolt-style tensioners.
 
 
SX12 - High-strength flexnut
 
For through hole applications we have developed the Superbolt flexnut, which is a reactive nut that is able to flex elastically.
 
Description:
 
Flexnuts are used in combination with our other products. They are designed to flex out at the bottom and flex in toward the top of the nut. This distributes the bolt load along many threads, adds elasticity, and prevents stress concentrations in the first few threads. This reduces the possibility of stud breakage.
 
Selection Guide:
 
  •   SX12 - High-strength flexnut
  •   Dimension range: M20-M160 (3/4" - 6")
  •   Approx. bolt stress depending on size: 500 to 900 N/mm2 (70 to 130 ksi)
  •   Temperature range: -10 to 250oC (0 to 500oF)
  •   Surface treatment: optional
  •   Application samples: Reactive nut for through hole applications. Adds elasticity to bolted joints. Highly recommended for short clamp lengths.
  •   Notes: In combination with CY nut-style tensioners or SB12 bolt-style tensioners.
 
 
Dimension Charts - See brochure
 
Easy Order Shortcuts
No Part
Number
Description Image Stock
Qty
Price
Each
Qty
Ord'd
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1 SUP-SMX-175-8/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
Part SUP-SMX-175-8/W 
1.75 Inch Thread / Body Diameter 
8 Threads Per Inch 
3/8 Inch Diameter Set Screws 
3/16 Inch Allen Bit Size 
3.625 Inch Body Diameter 
Total Thickness with Washer 1.0625 Inch 
Includes a Tube of JL-M Moly Lube and the Hardened Washer  
[Amazon]  
(3LBS) H 4" L 5" W 4 Box
0 $121.12
2 SUP-SMX-802/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
1.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Foot 
3/8 Inch Diameter Set Screws 
3/16 Inch Allen Bit 
2.34 Inch Body Diameter 
Total Thickness with Washer 0.94 Inch 
Includes a Tube of JL-Moly Lube and the Hardened Washer 
For 602 & 802 Mill Motors 
(4LBS) H 6.00" L 7.00" W 6.00" 
[Amazon]
0 $55.50
3 SUP-SMX-803/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
1.25 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
3/8 Inch Diameter Set Screws 
3/16 Inch Allen Bit 
2.72 Inch Nominal Thread / Stud Diameter 
Total Thickness with Washer 0.94 Inch 
Includes a tube of JL-M Moly Lube and the Hardened Washer 
For 603, 604 & 803, 804 Mill Motors 
(3LBS) H 5.00" L 5.00" W 5.00" Box 
[Amazon] 
6 $68.00
4 SUP-SMX-804/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
1.25 Inch Thread / Body Diameter 
8 Threads Per Inch 
3/8" Diameter Set Screws 
3/16 Inch Allen Bit 
2.72 Inch Body Diameter 
Total Thickness with Washer 0.94 Inch 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 603, 604 & 803, 804 Mill Motors
- 0 $68.00
5 SUP-SMX-806/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
1.50 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
Set Screws 
1/4 Inch Allen Bit 
3.59 Inch Body Diameter 
Total Thickness with Washer 1.00 Inch 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 606, 806 & MD102 Mill Motors  
(4LBS) H 4" L 5" W 4" box 
[Amazon]
2 $105.19
6 SUP-SMX-808/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
2.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
Qty. 8, 1/2" Diameter Set Screws / Jacking Bolts 
1/4 Hex Bit Size 
3.72 Inch Body Diameter 
Total Thickness with Washer 1.00 Inch 
Includes a Tube of JL-M Moly Jack Bolt Lube and the Hardened Washer 
For 608 & 808 Mill Motors  
(3LBS) H 8.00" L 8.00" W 8.00" Box 
[Amazon]
2 $134.72
7 SUP-SMX-810/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
2.25 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
4.47 Inch Body Diameter 
Total Thickness with Washer 1.13 Inches 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 610 & 810 Mill Motors (5LBS)
- 3 $185.94
8 SUP-SMX-812/W Superbolt Mill Motor Nut Assembly with a Hardened Washer  
Part SUP-SMX-812/W 
2.50 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
Torque to 58 LB FT Each 
4.72 Inch Body Diameter 
Total Thickness with Washer 1.13 Inches 
Includes a Tube of JL-M Moly Lube and the Hardened Washer G3B37 
For 612 & 812 Mill Motors 
[Amazon] 
(4LBS) H 6" L 6" W 6" Box
3 $216.75
9 SUP-SMX-814/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
3.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
Qty 8, 5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
Body Diameter 5.47 Inches 
Total Thickness with Washer 1.25 Inches 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
Set Screw Torque 58 LB FT with JL-M Standard Preload 132,000 LBS 
For 614 & 814 Mill Motors  
(9LBS) H 4.00" L 5.00" W 4.00" 
[Amazon]
3 $286.88
10 SUP-SMX-816/W Superbolt Mill Motor Nut Assembly 
With a Hardened Washer 
3.25 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
5.97 Inch Body Diameter 
1.13 Inch Total Thickness with Washer 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 416, 616 & 816 Mill Motors 
(9LBS) H 6.00" L 6.00" W 6.00" 
[Amazon]
1 $362.31
11 SUP-SMX-818/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
3.50 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
5/8" Diameter Set Screws 
5/16" Allen Bit 
Body Diameter 6.47 Inches 
Total Thickness with Washer 1.13 Inch 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 618 & 818 Mill Motors 
(4LBS) H 4.00" L 5.00" W 4.00" 
[Amazon]
2 $396.31
12 SUP-SMX-820/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
4.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
Body Diameter 7.22 Inches 
Total Thickness with Washer 1.38 Inches 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 620, 622 & 820, 822 Mill Motors 
(14LBS) H 9.00" L 9.00" W 9.00" Box 
[Amazon]
6 $427.13
13 SUP-SMX-822/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
4.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch 
5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
Body Diameter 7.22 Inches 
Total Thickness with Washer 1.38 Inches 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 620, 622 & 820, 822 Mill Motors
- 0 $472.81
14 SUP-SMX-824/W Superbolt Mill Motor Nut Assembly with a Hardened Washer 
4.00 Inch Thread Dia 
8 Threads Per Inch  
5/8 Inch Diameter Set Screws 
5/16 Inch Allen Bit 
Body Diameter 7.72 Inches 
Total Thickness with Washer 1.38 Inch 
Includes a Tube of JL-M Moly Lube and the Hardened Washer 
For 624 & 824 Mill Motors 3/17
- 0 $496.19
15 SUP-SMX-M27/W Superbolt Mill Motor Nut Assembly with Hardened Washer, Motor Frame - 1LT3 166, Thread Size - M27-1.5 3/7 - 0 $52.06
16 SUP-SMX-M33/W Superbolt Mill Motor Nut Assembly with Hardened Washer, Motor Frame - 1LT2 136/156, Thread Size - M33-1.5 - 0 $104.83
17 SUP-MT-100-14/W Superbolt Torquenut MT 
Torquenut / Standard Mechanical Tensioners with Hardened Washer 
100 = 1.00 Bolt / Stud Diameter 
14 - 14 TPI / Threads Per Inch 
/ W = Hardened Washer & JL-G Lubricant 
1.90 Inch OD 
Stock to 2 Weeks 7/14 
(1LB) H 4" L 5" W 4" Box 
[Amazon]
3 $48.88
18 SUP-MT-100-8/W Superbolt Mechanical Tensioner 
Standard Torque Nut 
1.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch  
With a Hardened Washer & JL-G Jack Bolt Lubricant 
1.90 Inch OD 
(3LBS) H 4.00" L 4.00" W 4.00" 
[Amazon]
2 $54.12
19 SUP-MT-150-12/W Superbolt Torquenut MT 
Torquenut / Standard Mechanical Tensioners 
1.5 Inch Nominal Thread Diameter 
12 Threads Per Inch 
Features Hex-Head Jack Bolts 
With a Hardened Washer & 
Tube of JL-G Graphite Lubricant  
(3LBS) H 5" L 4" W 4" Box 
[Amazon]
2 $76.50
20 SUP-MT-175/W Superbolt Torquenut MT 
Torquenut / Standard Mechanical Tensioners 
175 = 1.75 Bolt / Stud Diameter 
/W Includes a Hardened Washer 
3.08 Inch OD 
2 Weeks (2.3LBS)
- 0 $94.56
21 SUP-MT-300-8/W Superbolt Mechanical Tensioner 
Part SUP-MT-300-8/W 
Standard Torque Nut 
3.00 Inch Nominal Thread / Stud Diameter 
8 Threads Per Inch  
Qty 8, 9/16 Inch Hex-Head Jacking Bolts 
With a Hardened Washer by 0.31 Thick & JL-G Jack Bolt Lubricant 
5.2 Inch OD Dated 7/17 
[Amazon] 
(9LBS) H 6" L 6" W 4" Box
0 $326.19
22 SUP-MT-350-4/W Superbolt Mechanical Tensioner 
Standard Torque Nut 
3.50 Inch Nominal Thread / Stud Diameter 
4 Threads Per Inch  
Qty X, X/XX Inch Hex-Head Jacking Bolts 
With a Hardened Washer by 0.XX Thick & JL-G Jack Bolt Lubricant 
X.X Inch OD 
(13LBS) H 6" L 6" W 4" Box 
[Amazon]
4 $409.06
23 SUP-MT-375-8 SuperBolt Tensioner. STD, MT, 3.750-8 TPI Mechanical Tensioner with Hardened Washer 9/14 - 0 $479.19
24 SUP-MT-48 MT Standard Torque Nut, Coarse Pitch 5 MM - 0 $128.75
25 SUP-MT-M20-2.5/W Superbolt Torquenut MT 
Torquenut / Standard Mechanical Tensioners with Hardened Washer 
20 = 20mm Diameter 
2.5 = 2.5 TPI / Threads Per Inch 
/ W = Includes a Hardened Washer & JL-G Lubricant 
37mm OD
- 0 $41.44
26 SUP-SB8-100-14-0400 Superbolt 1.00-14 UNF x 4.00 Inches Long 8/14 - 0 $162.56
27 SUP-SJ-200-4.5/W Superbolt SJ-200-4.5 3 Weeks 4/14 - 0 $157.50
28 SUP-SJX-200-12/W Superbolt Jam Nut 
Part SJX-200/W 
2.00 Inch Thread Diameter 
4.2 Inch O.D. 
SJX are used for applications where limited headroom and / or limited thread engagement is required 
On request, Jamnuts are available with 
Superbolt's patented captive set screws 
10/14
- 0 $206.13
29 SUP-H650-275-8/W Superbolt STD.H650, 2.750-8  
2.75-8 TPI Medium Temp 
Tensioner with Hardened Washer 5/14
- 0 $345.31
30 SUP-H650T-275-8/W Superbolt STD.H650T, 2.750-8  
2.75-8 TPI Medium Temp 
Tensioner with Hardened Washer 5/14
- 0 $386.75
31 SUP-JL-M TUBE 15ML Superbolt Lube 
Moly-Disulphide Based Jackbolt Lubricant 
One 15ML Squeeze Tube with each Supernut order 
Apply between Jackbolt Tips & Washer 
(1LB) H 4.00" L 5.00" W 4.00" Box 
[Amazon]
124 $4.50
32 SUP-JL-G TUBE 15ML Superbolt Lube 
Graphite Based Jackbolt Lubricant 
One 15ML Squeeze Tube 
Apply between Jackbolt Tips & Washer 
(1LB) H 4.00" L 5.00" W 4.00" 
[Amazon]
201 $2.50
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What is a multi-jackbolt tensioner?

 
A "Superbolt" or "multi-jackbolt tensioner (MJT)" is a direct replacement for hex nuts, covered nuts, bolts, etc. They spin onto your existing bolt or stud and provide a better way to bolt up your joint. They consist of three components, shown above.
 
Click here to learn more
Superbolt Lube
 

Superbolt Lube
 
JL-M
Moly-Disulphide Based Jackbolt Lubricant: JL-M MSDS
 
JL-G
Graphite Based Jackbolt Lubricant: JL-G MSDS
 
Apply between Jackbolt Tips & Washer.
 
Nut-style tensioners

Nut-style tensioners
 
Superbolt multi-jackbolt tensioners (MJTs) replace existing hex nuts. Only hand tools are required for installation and removal of any size tensioner. Safe, accurate and economical! We have a wide range of standard series, as well as an unlimited capacity to create special designs to meet your unique needs.
Bolt-style tensioners

Bolt-style tensioners
 
Bolt style Superbolt multi-jackbolt tensioners (MJTs) replace existing studs or bolts. Ideal for applications with tapped holes, or where threading a stud into a nut would be impractical. The outside diameter is smaller than a nut type tensioner on a stud, allowing MJTs to fit into tighter areas.
Flexnuts

Flexnuts
 
Flexnuts are used in combination with Superbolt tensioners and are designed to flex out at the bottom and flex in toward the top of the nut. This distributes the bolt load along many threads, adds elasticity, and prevents stress concentrations in the first few threads.
SMX Mill Motor Nuts

SMX Mill Motor Nuts
 
SMX Mill Motor Nuts are used to replace standard mill motor armature nuts supplied by electric motor manufacturers. SMX tensioners are available for most standard motor frame sizes. Preload matches the hub stress capacity of brake wheels and pulleys.
 
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Brake Products, Inc.   16751 Hilltop Park Place
  Chagrin Falls, Ohio 44023
  Phone: (440) 543-7962
  Fax:     (440) 543-7963
  Web:   www.brakeproducts.com
  Email: sales@brakeproducts.com
  Federal ID #: 34-1473351
  CAGE Code: 1QTP8
  DUNS# 14-748-2392
  Download: Form W-9
Supplier of Industrial Brake Parts Since 1985