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techtalk:ref:tools120 [2018/06/28 01:58] hippysmack [NPSC Tap Drill Sizes] |
techtalk:ref:tools120 [2018/06/28 03:03] hippysmack [Standard Tap Wrench (spanner)] |
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==== SAE and Metric Tap Drill Sizes ==== | ==== SAE and Metric Tap Drill Sizes ==== | ||
- | Below are standard pre-drill sizes for size taps used. These are common drill sizes and they are sufficient for most applications on a Sportster. | + | Below are standard pre-drill sizes for size taps used. These are common drill sizes and they are sufficient for most applications on a Sportster. ((Starrett tap drill sizes chart unless otherwise noted)) |
^ SAE Tap ^ Drill Size ^ Drill Bit | ^ Metric Tap ^ Drill Bit | | ^ SAE Tap ^ Drill Size ^ Drill Bit | ^ Metric Tap ^ Drill Bit | | ||
^ Thread size ^ #/Letter ^ Diameter- in | ^ Thread Size ^ Diameter- mm / in | | ^ Thread size ^ #/Letter ^ Diameter- in | ^ Thread Size ^ Diameter- mm / in | | ||
- | |6-32 | 36 |0.1065 in ^ |M3 x 0.5 |2.50 mm / 0.0984 in | | + | |6-32 | 36 |0.1065 in ^ |M3 x 0.5 |2.50 mm / 0.0984 in | |
- | |6-40 | 33 |0.1130 in ^ |M3.5 x 0.6 |2.90 mm / 0.1142 in | | + | |6-40 | 33 |0.1130 in ^ |M3.5 x 0.6 |2.90 mm / 0.1142 in | |
- | |8-32 / 8-36 | 29 |0.1360 in ^ |M4 x 0.7 |3.30 mm / 0.1299 in | | + | |8-32 / 8-36 | 29 |0.1360 in ^ |M4 x 0.7 |3.30 mm / 0.1299 in | |
|10-24 | 25 |0.1495 in ^ |M4.5 x 0.75 |3.70 mm / 0.1457 in | | |10-24 | 25 |0.1495 in ^ |M4.5 x 0.75 |3.70 mm / 0.1457 in | | ||
- | |10-32 | 21 |0.1590 in ^ |M5 x 0.8 |4.20 mm / 0.1654 in | | + | |10-32 | 21 |0.1590 in ^ |M5 x 0.8 |4.20 mm / 0.1654 in | |
- | |12-24 | 16 |0.1770 in ^ |M6 x 1 |5.00 mm / 0.1968 in | | + | |12-24 | 16 |0.1770 in ^ |M6 x 1 |5.00 mm / 0.1968 in | |
|12-28 | 14 |0.1820 in ^ |M7 x 1 |6.00 mm / 0.2362 in | | |12-28 | 14 |0.1820 in ^ |M7 x 1 |6.00 mm / 0.2362 in | | ||
- | |1/4-20 | 7 |0.2010 in ^ |M8 x 1.25 |6.70 mm / 0.2638 in | | + | |1/4-20 | 7 |0.2010 in ^ |M8 x 1.25 |6.70 mm / 0.2638 in | |
- | |1/4-28 | 3 |0.2130 in ^ |M8 x 1 |7.00 mm / 0.2756 in | | + | |1/4-28 | 3 |0.2130 in ^ |M8 x 1 |7.00 mm / 0.2756 in | |
- | |5/16-18 | F |0.2570 in ^ |M10 x 1.5 |8.50 mm / 0.3346 in | | + | |5/16-18 | F |0.2570 in ^ |M10 x 1.5 |8.50 mm / 0.3346 in | |
- | |5/16-24 | I |0.2720 in ^ |M10 x 1.25 |8.70 mm / 0.3425 in | | + | |5/16-24 | I |0.2720 in ^ |M10 x 1.25 |8.70 mm / 0.3425 in | |
- | |3/8-16 | 5/16 |0.3125 in ^ |M12 x 1.75 |10.20 mm / 0.4016 in | | + | |3/8-16 | 5/16 |0.3125 in ^ |M12 x 1.75 |10.20 mm / 0.4016 in | |
- | |3/8-24 | Q |0.3320 in ^ |M12 x 1.25 |10.80 mm / 0.4252 in | | + | |3/8-24 | Q |0.3320 in ^ |M12 x 1.25 |10.80 mm / 0.4252 in | |
- | |7/16-14 | U |0.3680 in ^ |M14 x 2 |12.00 mm / 0.4724 in | | + | |7/16-14 | U |0.3680 in ^ |M14 x 2 |12.00 mm / 0.4724 in | |
- | |7/16-20 | 25/64 |0.3906 in ^ |M14 x 1.5 |12.50 mm / 0.4921 in | | + | |7/16-20 | 25/64 |0.3906 in ^ |M14 x 1.5 |12.50 mm / 0.4921 in | |
- | |1/2-13 | 27/64 |0.4219 in ^ |M16 x 2 |14.00 mm / 0.5512 in | | + | |1/2-13 | 27/64 |0.4219 in ^ |M16 x 2 |14.00 mm / 0.5512 in | |
- | |1/2-20 | 29/64 |0.4531 in ^ |M16 x 1.5 |14.50 mm / 0.5709 in | | + | |1/2-20 | 29/64 |0.4531 in ^ |M16 x 1.5 |14.50 mm / 0.5709 in | |
+ | |9/16-12 | 31/64 |0.4844 in ^ |M18 x 2.5 |15.50 mm / 0.6102 in | | ||
+ | |9/16-18 | 33/64 |0.5156 in ^ |M18 x 1.5 |16.50 mm / 0.6496 in | | ||
+ | |5/8-11 | 17/32 |0..5312 in ^ |M20 x 2.5 |17.50 mm / 0.6890 in | | ||
+ | |5/8-18 | 37/64 |0.5781 in ^ |M20 x 1.5 |18.50 mm / 0.7283 in | | ||
+ | ==== Thread Tolerance ==== | ||
Threads can be cut to a tighter or looser fit depending on the needs or sometimes availability of drill bit sizes. For instance, drill bits are available in a wide variety of sets or kits. The most common sizes are usually the ones that are provided. However, many suppliers carry a drill index kit which comes with a huge amount of drill bits in step sizes. Some are in 1/32 steps and some are in one thousandths increments. So, if you want a close tolerance fit on a 3/8"x16 threaded connection, you could use a 0.2969" pre-drill or for a looser fit you could use a 0.3230" pre-drill. Even with a standard 0.3125" drill bit, a hand drill is not going to produce a straight hole every time. If you have to over compensate with it and wallow out the hole just a bit to get it straight, you may be producing a looser threaded connection without realizing it. Care should be taken on tighter pre-drilled holes since it creates more friction and heat when tapping than a standard or slightly larger hole and it can lead to breaking taps off in the hole or cracking the piece you're working on. ((hippysmack from the XLFORUM)) | Threads can be cut to a tighter or looser fit depending on the needs or sometimes availability of drill bit sizes. For instance, drill bits are available in a wide variety of sets or kits. The most common sizes are usually the ones that are provided. However, many suppliers carry a drill index kit which comes with a huge amount of drill bits in step sizes. Some are in 1/32 steps and some are in one thousandths increments. So, if you want a close tolerance fit on a 3/8"x16 threaded connection, you could use a 0.2969" pre-drill or for a looser fit you could use a 0.3230" pre-drill. Even with a standard 0.3125" drill bit, a hand drill is not going to produce a straight hole every time. If you have to over compensate with it and wallow out the hole just a bit to get it straight, you may be producing a looser threaded connection without realizing it. Care should be taken on tighter pre-drilled holes since it creates more friction and heat when tapping than a standard or slightly larger hole and it can lead to breaking taps off in the hole or cracking the piece you're working on. ((hippysmack from the XLFORUM)) | ||
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- | |Standard tap wrenches. ((photo by Hippysmack))|No name, cheap metal. (center distorted) But, it has \\ ran many taps. Holds the tap via a threaded handle. ((photo by Hippysmack))| | + | |Standard tap wrenches. ((photo by Hippysmack))|No name, cheap metal. (center distorted) But, it has \\ ran many taps. Holds the tap via a threaded handle. ((photo by Hippysmack))|Hand made tap wrench ((photo by Freewheeler of the XLFORUM http://xlforum.net/forums/showthread.php?t=1852458&highlight=stripped+plug))| |
- | |{{techtalk:ref:tools:tap_wrenches_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:tap_wrench_3_by_hippysmack.jpg?direct&300|}}| | + | |{{techtalk:ref:tools:tap_wrenches_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:tap_wrench_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:tap_wrench_by_freewheeler.jpg?direct&300|}}| |
- | |This Starrett 91D, [[http://www.starrett.com/metrology/product-detail/91D|specs here]] (for tap sizes 5/16" - 3/4") has a "V" shaped plunger which allows you to grip and hold square and round tooling. \\ One use for this feature is using the tap wrench to turn a reamer for bushings. Holds the tap / tooling via an internal plunger pushed up by the knurled threaded handle ((photos by Hippysmack))||| | + | |This Starrett 91D, [[http://www.starrett.com/metrology/product-detail/91D|specs here]] (for tap sizes 5/16" - 3/4") has a "V" shaped plunger which allows you to grip and hold square and round tooling. \\ One use for this feature is using the tap wrench to turn a reamer for bushings. \\ Holds the tap / tooling via an internal plunger pushed up by the knurled threaded handle ((photos by Hippysmack))||| |
|{{techtalk:ref:tools:tap_wrench_2-_starrett_91d_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:tap_wrench_1-_starrett_91d_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:tap_wrench_1_w_reamer_by_hippysmack.jpg?direct&300|}}| | |{{techtalk:ref:tools:tap_wrench_2-_starrett_91d_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:tap_wrench_1-_starrett_91d_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:tools:tap_wrench_1_w_reamer_by_hippysmack.jpg?direct&300|}}| | ||