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Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock
Crawling Machine.

Offroaders Guide to Gearing up for Offroad
From Basic Equipment to Well Equipped.  An extensive list guide to help you prepare your vehicle for the offroad.


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Jeep Central
From Jeep History to Tech Specs and Projects.  This section is all about Jeeps.
Jeep Technical Info
Engines
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Installing 23,000 Volt Offroad Lights


Onboard Air
Converting a York
AC Compressor
to Pump Air

What are HID Lights?

Onboard Air
Converting a York
AC Compressor
to Pump Air

Warn 9500i Winch Installation

Warn X8000i
Winch Installation

 

HEI Ignition
Installation & Review

Lockers, Limited Slips &
other Differentials Explained

 

 

 

Wheeling in the Valley of the Ferns

1.jpg (70086 bytes)
Tellico North Carolina


Paragon Adventure Park
Rock Krawl

Thousands more photos here..»

 
 

 

 

 

Bolt Identification
Bolthead Markings
Bolt Torque Specs
  
 

Most bolts are stamped with either a number (metric bolts) or a series of lines (American bolts also known as fractional bolts).  These numbers or markings indicate their minimum strength or, technically speaking, their property class.   In addition to these markings, most reputable bolt manufacturers will also stamp their trademark in the head of the bolt, which allows for easy identification and accountability.  In most cases, bolts used in machinery are made to SAE standard J429, and bolts used in structural applications are made to ASTM standards.  However not all bolts are stamped.  As an example, the hardware manufactured for OEM purposes do not require markings.  The importance of what is stamped on the head of a bolt relates to the job the bolt will do.  First if a bolt is a replacement of an existing bolt you wouldn't want to substitute the bolt for a weaker bolt compromising strength.  Another reason is if you know the property class of an existing bolt and you know its diameter, you can determine the suggested basic torque setting, even if you don't have a reference to the original torque recommendations.  Typically replacing a lower grade bolt with a stronger bolt is generally acceptable however there are instances when a lower grade bolt is used to handle certain types of loads that might shear a harder bolt.  If quality and strength is a concern, stick with marked bolts.

 

Visual ID Description Material Tensile Strength
No lines
Unmarked
Intermediate
Quality
SAE Grades 0-1-2
Low Carbon Steel 65,000 p.s.i.
3 Lines -
Common
commercial
quality
Automotive and
AN Bolts
SAE Grade 5
Med. carbon steel
Tempered
120,000 p.s.i.
4 Lines -
Medium
commercial
quality
Automotive and
AN Bolts
SAE Grade 6
Med. carbon steel
Quenched &
tempered
140,000 p.s.i.
5 Lines -
rarely used
SAE Grade 7
Med. carbon alloy
steel
140,000 p.s.i.
6 Lines -
Best
commercial
quality
N.A.S. & Aircraft
SAE Grade 8
Med. carbon alloy
steel Quenched
and tempered
150,000 p.s.i.
Supertanium Special alloy
steel
Quenched &
tempered
160,000 p.s.i.
A-354-BD
A490
Med. Carbon
alloy steel
Quenched &
tempered
150,000 p.s.i.
Socket head
cap screw
Also N.A.S.
Aircraft
standard
High carbon
Quenched &
tempered
160,000 p.s.i.
N.A.S. 144
Aircraft
standard
steel
High carbon
Quenched &
tempered
160,000 p.s.i.
N.A.S. 624
National
aircraft
standard
steel
High carbon
Quenched &
tempered
180,000 p.s.i.
Aircraft
No number
assigned steel
High carbon
Quenched &
tempered
220,000 p.s.i.

  
   

 

BOLT TORQUE SPECIFICATIONS

  Grade 1 or 2
Grade 5
Grade 8
Special Alloy
Capscrew
Diameter (inch)
and minimum
tensile Strength (P.S.I.)
to 1/2" - 69,000
to 3/4" - 64,000
to 3/4" - 120,000
to 1" - 115,000
to 1" - 150,000 to 1" - 185,000
Bolt Size & Thread Pitch

Torque (foot/lbs) for plated bolts with clean, dry threads

1/4-20 6 10 12 14
-28 7 12 15 17
5/16-18 13 20 24 29
-24 14 22 27 35
3/8-16 23 36 44 58
-24 26 40 48 69
7/16-14 37 52 63 98
-20 41 57 70 110
1/2-13 57 80 98 145
-20 64 90 110 160
9/16-12 82 120 145 200
-18 91 135 165 220
5/8-11 111 165 210 280
-18 128 200 245 310
3/4-10 200 285 335 490
-16 223 317 370 530
7/8-9 315 430 500 760
-14 340 470 550 800
1-8 400 650 760 1130
-14 460 710 835 1210
Torque values shown are for high nickel-chrome Bowmalloy cap screws.  Other high-alloy cap screws may not have the same values.  Always use the manufacturer's specifications if they do not agree with this chart.
A Bolt must be torqued  properly before it's optimum strength can be realized.  Torqueing also maximizes the elasticity of the bolt to keep the fastener from loosening up on it's own.  Over torqueing can ruin this elastic effect.  When using lubricated threads, reduce torque values by the following amounts...45% when using anti-seize compound, 40% when using grease or heavy oil, 30% with graphite and 25% with white lead.  Increase torque values by 5% for unplated bolts.  Always use manufacturers torque specifications if they do not agree with this chart.  
 

Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock Crawling Machine.

All Terrain 
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Tire Reviews & Info

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Ramp Travel Index
RTI / Ramp Travel Index What it is and how to calculate it, with and without the ramp.

Offroad Tire Info
P-Metric Tire Sizes Conversion to Inches
Tire Terminology
Wheel Terminology
How to Pick the Right
Tires for your Truck
Truck Tire Info
Tires - What Hits What Fits
  
All Terrain  Mud Terrain
Tire Reviews & Info
Mud Terrain MT Tire Reviews
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Super Swamper Bogger
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Interco IROK TSL
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Super Swamper Narrow
Interco SS-M16 Swamper
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Thornbird TSL
Parnelli Jone Dirt Grip
BFGoodrich Krawler
BFGoodrich MT T/A KM
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BFGoodrich AT TA KO
BFGoodrich Mud King XT
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Kelly-Springfield Safari MSR
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Kumho Road Venture KL71
Kumho Road Venture AT
Dick Cepek Mud Country
Dick Cepek F-C II
Dick Cepek Fun Country II
Dick Cepek Fun Country Nylon
Dick Cepek Fun Country Kevlar
Mastercraft Courser MT
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Maxxis M-8080 Mudzilla
Maxxis MT-754 Buckshot
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Maxxis MA-751 Bravo
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Maxxis MT-762 BigHorn
Nitto Mud Grappler
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Nitto Dune Grappler
Nokian Vatiiva MT
Pit Bull Rocker Extreme
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Goodyear Wrangler MT/R
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Toyo Open Country MT
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Michelin LTX A/T²
Michelin LTX AT2 Press
Michelin LTX AT2
Mickey Thompson MTZ
Mickey Thompson MTX
Mickey Thompson Baja Claw Radial
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Mickey Thompson Baja ATZ Radial SLT
Competition Claw
Dunlop Mud Rover
Federal Couragia M/T
Nitto Dura Grappler
Yokohama Geolandar
  
Dick Cepek's 2008 F-250 Super Duty Project Vehicle – Project CRUSHER
 
Mud Tire Reviews
Product Reviews
Tire Reviews
 
  
 
ATV Tire Index
Carlisle 489 Titan
Dunlop Quadmax
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Quadmax Sport Development
Highlifter Outlaw
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Super Swamper TSL ATV
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Swamp Lite ATV Tires
 
ATV Tire FAQs
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Quad Tire Reviews Index

 


Off-Road Lights
by LightForce Product Review / Installation.
from Off-Road Lights

 


Jeep Dana 300 TeraLow - 4:1 Gearset for the Dana 300 Transfer Case

Jeep Trans Swap
T-18A Transmission Rebuild & Short Shaft Conversion
  


Black Diamond Suspension Lift install for CJ-7

 

From the
Department of Cheap   Tricks and Useful Tips

  
Ultra-Cool Hand Throttle for Free!

Jeep V8 Swap Tips

The Exploding Clutch

Radiator Protection using 6 bucks worth of material

Cracked Under Pressure - Fixing a smashed fingernail

A Cheap, effective alternative to undercoating

Home-built Saginaw Gearbox Brace for the cost of lunch!

Ammo Box Storage - Mounting Them for Quick Disconnect

Home-built Serious Skid-Plate protection for the Oil Pan for under 20 bucks!