How many mm in 1 inch? The answer is 25.4.
mm = in
________
0.039370
1 thou (THOUSANDTH OF AN INCH) is exactly equal to: 0.001" = 0.0254 mm
e.g. one hundredth of an inch is "10 thou"
Rounded Conversion Table - Common #
.010" (10 thou) = 0.25mm
.015" (15 thou) = 0.40mm
.020" (20 thou) = 0.50mm
.030" (30 thou) = 0.75mm
.040" (40 thou) = 1.00mm
.060" (60 thou) = 1.50mm
.080" (80 thou) = 2.00mm
.100" (100 thou) = 2.5mm
.125" (125 thou) = 3.2mm
.156" (156 thou) = 4.00mm
.188" (188 thou) = 4.80mm
.250" (250 thou) = 6.30mm
Conversion Table
| INCHES | mm | INCHES | mm | INCHES | mm | ||
| 0.0005 | 0.0127 | 0.0060 | 0.1524 | 0.0160 | 0.4064 | ||
| 0.0010 | 0.0254 | 0.0070 | 0.1778 | 0.0180 | 0.4572 | ||
| 0.0015 | 0.0381 | 0.0080 | 0.2032 | 0.0200 | 0.5080 | ||
| 0.0020 | 0.0508 | 0.0090 | 0.2286 | 0.0220 | 0.5588 | ||
| 0.0025 | 0.0635 | 0.0100 | 0.2540 | 0.0240 | 0.6096 | ||
| 0.0030 | 0.0762 | 0.0110 | 0.2794 | 0.0250 | 0.6350 | ||
| 0.0035 | 0.0889 | 0.0120 | 0.3048 | 0.0260 | 0.6604 | ||
| 0.0040 | 0.1016 | 0.0130 | 0.3302 | 0.0280 | 0.7112 | ||
| 0.0045 | 0.1143 | 0.0140 | 0.3556 | 0.0300 | 0.7620 | ||
| 0.0050 | 0.1270 | 0.0150 | 0.3810 | 0.0320 | 0.8128 |
| INCHES | mm | INCHES | mm | |
| 0.0350 | 0.8890 | 0.10000 | 2.54000 | |
| 0.0400 | 1.0160 | 0.12500 | 3.17500 | |
| 0.0450 | 1.1430 | 0.25000 | 6.35000 | |
| 0.0500 | 1.2700 | 0.50000 | 12.70000 | |
| 0.0600 | 1.5240 | 0.75000 | 19.05000 | |
| 0.0625 | 1.5875 | 1.00000 | 25.40000 | |
| 0.0700 | 1.7780 | 1.25000 | 31.75000 | |
| 0.0750 | 1.9050 | 1.50000 | 38.10000 | |
| 0.0800 | 2.0320 | 1.75000 | 44.45000 | |
| 0.0900 | 2.2860 | 2.00000 | 50.80000 |
Stretch Gauge http://www.carcraft.com/techarticles/
ARP Instructions http://arp-bolts.com/
When using a stretch gauge it's best to measure the fastener prior to starting and monitor overall length during installation. When the bolt has stretched a specified amount, the correct preload or clamping force has been applied. We recommend that you maintain a chart of all rod bolts and make a note of the fastener length prior to installation and after any disassembly. If there is a permanent increase of .0005˝ or more in length, there is a deformation and the bolt should be replaced. You can download a sample rod bolt stretch monitoring chart by clicking here.
| U.S. STANDARD TORQUE VALUES | ||||||
| Recommended Torque to Achieve Optimum Preload (Clamping Force) | ||||||
| Fastener Tensile Strength | 170,000/180,000 | 190,000/200,000 | 220,000 PSI | |||
| PSI | PSI | (1,515 Nmm2) | ||||
| (1,171 Nmm2) | (1,309 Nmm2) | |||||
| Fastener Diameter | Torque | Preload(lbs) | Torque | Preload(lbs) | Torque | Preload(lbs) |
| ARP lube | ARP lube | ARP lube | ||||
| (ft-lbs) | (ft-lbs) | (ft-lbs) | ||||
| 1/4″ | 12 | 3,492 | 14 | 3,967 | 16 | 4,442 |
| 5/16″ | 24 | 5,805 | 28 | 6,588 | 32 | 7,371 |
| 3/8″ | 45 | 8,622 | 50 | 9,782 | 55 | 10,942 |
| 7/16″ | 70 | 11,880 | 80 | 13,470 | 90 | 15,060 |
| 1/2″ | 110 | 16,391 | 125 | 18,515 | 140 | 20,639 |
| 9/16″ | 160 | 21,220 | 180 | 23,944 | 200 | 26,668 |
| 5/8″ | 210 | 26,372 | 240 | 29,756 | 270 | 33,140 |
| 6mm | 11 | 3,359 | 13 | 3,814 | 15 | 4,269 |
| 8mm | 24 | 5,801 | 28 | 6,581 | 32 | 7,361 |
| 10mm | 54 | 9,970 | 62 | 11,305 | 70 | 12,640 |
| 11mm | 72 | 12,184 | 82 | 13,961 | 92 | 15,738 |
| 12mm | 98 | 14,472 | 112 | 16,949 | 125 | 19,425 |
| 14mm | N/A | N/A | 184 | 22,771 | 205 | 25,730 |
| 16mm | N/A | N/A | 244 | 29,664 | 272 | 33,519 |
DIY Installer - http://www.e30m3project.com/
Understanding Stretch - http://performanceenginetech.com/
A bolt functions similar to a spring, in that it needs to be stretched beyond it’s static length in order to apply a clamping force. In the case of a connecting rod bolt, the clamping force must exceed the tensile load imparted by the attached components during high rpm operation. This is accomplished through a combination of bolt material selection and stretch dimension.
A common method for determining ideal stretch, is by incrementally increasing the amount of stretch until the bolt becomes permanently elongated. This dimension is termed yield, and a typical target stretch range is then determined to be 75-80 % of yield, with the min/max provided to the end user at +/- 5 % of this target. As an example:
Yield = .007″ stretch
Target stretch is 75-80 % of yield = .0052″ – .0056″
+/- 5 % of target = Min/Max of .0049″ – .0059″ (recommended stretch range)
Yield varies, and is affected by a variety of factors, such as material, bolt length, under-head register length, and shank diameter.
Torque vs. Stretch - http://performanceenginetech.com/
Now that we understand that the stretch value is what needs to be achieved, it’s necessary to verify what amount of torque on the wrench being used is going to stretch the bolt within spec. All rod manufacturers provide an information sheet that will list the recommended torque spec and bolt stretch range. Here’s the process I use to match my torque wrench reading the proper stretch value:
- Install the cap on the rod with the manufacturers recommended lube on the bolts.
- Carefully draw the cap into the rod using a nut-driver alternating from side to side in order to keep everything square until the cap & bolts are properly seated.
- Loosen one bolt just enough to be sure there is no load on it.
- Install the bolt stretch gauge on the loose bolt.
- Set the dial to “0″ – remove and re-install gauge to verify it still reads “0″
- Remove the gauge.
- Finger tighten the loose, just measured bolt.
- Torque the opposing bolt to 25 ft. lbs. – this assures it has a small amount of preload on it.
- Torque the measured bolt to the manufacturer’s recommended value.
- Install the stretch gauge, and see what the bolt stretched to.
- If the bolt isn’t within specs, loosen and adjust torque up or down until you reach the desired stretch.
- If the bolt is stretched within the specified range, loosen the opposing bolt and repeat the measure/torque/verify procedure.
- Repeat these steps to 4 bolts to assure that the same torque reading provides the same amount of stretch.
At this point you should be able to use the torque wrench reading determined in the outlined process to torque the rest of the bolts, or continue to stretch each bolt individually. I should also be clear that you must zero the dial on the stretch gauge for each bolt. The center dimples used for the gauge are not a critical dimension, and will vary from bolt to bolt.
Pauter Installation Information - /forged-4g15-pick-list-continued.html
Technical information about your Pauter Rods
Bolt Torque
- ALWAYS oil the threads and underside of bolt head thoroughly before installation!
WARNING!
- Never assemble rods without thread lubrication. Incorrect torque figures and/or seized threads will result.
These torque specifications are accurate for engine oil only, moly lubes will not give the same results. After drawing beam and cap together to seat both pieces evenly, torque should be reached in incremental steps of about 10-15 ft/lbs from one bolt to the other.
- NEVER torque one side completely while the other is loose.
ARP 2000 bolts
- 5/16"-24 thread bolts (3/8" socket) = 32 ft/lbs
- 3/8"-24 thread bolts (7/16"/11mm socket) = 50 ft/lbs
- 7/16"-20 thread bolts(7/16 or 1/2" socket) = 70 ft/lbs
- Stretch method: .0055"
Rod Cap Removal
To remove the rod cap from the rod body, we recommend loosening and backing out the rod bolts approximately 1/4" then carefully tap on the head of the bolt with a soft-faced hammer (aluminum, brass or plastic) until the rod and cap part at the split line and the alignment sleeves are free. You can then remove the bolts.
In Case of Rod Beam/Cylinder Bore Interference
Some makes of small bore-long stroke engines may require minor notching of the cylinder block to allow full rod rotation cycle without interference. This should be done prior to final engine cleaning and assembly. Allow 1/16" minimum clearance and watch location of oil ring at BDC.
DO NOT MODIFY ROD BEAM!
You can see it used here http://www.evans-tuning.com/
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