Information about the Chainsaw Bar wrenche, Scrench and T wrench

In the chart below, I have tried to cross reference various types of scrench with manufacturers of chain saws so it's a little bit easier for the individual to figure out what size scrench will fit their equipment.

SIZE	PART NO	USED ON	FOR MODELS
19 X 10 (3/4" X 13/32")	JPM-108	ECHO	CS-280, 290, 300, 301, 302, 315, 330, 351, 400, 440, 2800, 2900, 3000, 3450
		JOHN DEERE	30, 40
		OLYMPYK	234, 240, 241, 244, 935DF, OLE200, E140F

19 X 13 SCRENCHES

SIZE	PART NO	USED ON	FOR MODELS
19 X 13 (3/4" X 1/2")	JPM-104	ECHO	500,510, 550, 650, 660,701,750, 4600, 5500, CS8000
		DOLMAR	118
		HUSQVARNA	NEWER 32, 36R, 38, 40, 44, 50, 51, 60, 61, OLDER 65, 66, 77, 160, 162, 165R, 165RX, 166, 180, 181, 185, 240, 262, 263, 266, 268, 281, 285, 288, 298, 380, 480, 1100, 2100, 2101, 3120
		POULAN	25 series, PP235 THRU PP655, 285, 305, 335, 336, 365, 1800, 2000, 2300, 2800, 3000, 4000, 6900, 7700, 8500
		JOHN DEERE	8, 9, 12, 15, 50, 60, 70
		JONSERED	49, 50, 52, 52, 450, 451, 510 (OLD), 455, 490, 525, 521, 535, 590, 625, 62511, 630, 630s11, 670, 670C, 670S11, 2036, 2040, 2041, 2045, 2050, 2051, 2054, 2055, 2077, 2083
		PARTNER	R16 THRU R40, 420, S50, S55, S65, P70
		STIHL NOTE: SOME STIHL SAWS USE T27 TORX FASTENERS, IF SO, USE SCRENCH IN TABLE BELOW	E10, 009, 010, 011, 015, 020

19 X T27 TORX SCRENCHES

SIZE	PART NO	USED ON	FOR MODELS
19 X T27 TORX	JPM-103	OREGON	See description for STIHL below
19 X T27 TORX	JPM-103	STIHL	Fix all of the latest Stihl saws with Torx fasteners. 19mm barrel will remove bar nuts and spark plug while torx head will accommodate all other bolts on saw (except cylinder head bolts).

19 X 14 SCRENCHES

SIZE	PART NO	USED ON	FOR MODELS
19 X 14 (3/4" X 5/8")	JPM-103	LOMARD	COMANGO, SUPER LIGHTNING
19 X 14 (3/4" X 5/8")	JPM-103	POULAN	200, 300 400, 405, 655, 3400, 3700

19 X 16 SCRENCHES

SIZE	PART NO	USED ON	FOR MODELS
19 X 16 (3/4" X 5/8")	JPM-103	HOMELITE	1000 SERIES, XL 12 SERIES, XL 120 SERIES, XL 800-900 , XL 102,35,330,350,360,410,450,550,125 SERIE, EZ MINI, XL MINI
19 X 16 (3/4" X 5/8")	JPM-103	MCCULLOCH	100 Series, Eager Beaver 2, 600 ?, 605 ?, 610 ?, 650 ?,

19 X 17 SCRENCHES

SIZE	PART NO	USED ON	FOR MODELS
19 X 17 (3/4" x 11/16")	JPM-109	ECHO	1001
		DOLMAR	122, 144
		STIHL	051, 075 (OLDER), 076, TS510

Scrench, Wrench and Spark Plug Sizes for US/Imperial Nuts & Bolts

This next chart should be very helpful if you need to figure out what bolt size corresponds to each wrench size. It also helps you if you need to order new nuts because nuts are purchased based on the bolt size. Nuts can get lost or the threads can become damaged. This chart will help you find the right nut size based on the wrench you used to remove it.

Scrench or Wrench size	Fits nuts for this bolt size	Possible thread sizes
3/16" (.183")	#2, #3
1/4" (.250")	#4	#4-40
5/16" (.312")	#6	#6-32
11/32" (.34325")	#8	#8-24, #8-32
3/8" (.375")	#10	#10-24, #10-32
13/32" (.4062")	Metric 10mm	Metric M10 x 1.25
7/16" (.4375")	1/4" (.250")	1/4"-20, 1/4"-28
1/2" (.500")	5/16" (.312")	5/16"-18
9/16" (.5625")	3/8" (.375")	3/8"-16
5/8" (.625") Common Spark Plug Size	7/16" (.4375")	7/16"-20
11/16" (.6875")	Metric 18mm	Metric M18 x 1.5
3/4" (.750") Common Spark Plug Size	1/2" (.500")	1/2"-13
13/16" Common Spark Plug Size

Since you can have bolts of the same diameter with different thread types you need to check the thread so you know what to ask for. If you are able to locate the bolt you are trying to find a nut for, use your measuring tape and lay the bolt down on it stopping at the first inch mark. Count the number of threads in one inch and refer to the chart. The second number after the bolt size is the number of threads per inch. With all the products being made in China these, you are probably going to run into some metric threads. I have listed a couple but you really need thread guages to determine what metric thread you have, or you could take the bolt with you and try it out on a few metric nuts that are close in diameter.

Reccomended Torques for Spark Plug Installation
10mm with Gasket	12mm with Gasket	14mm with Gasket	14mm with Tapered Seat	18mm with Gasket	18mm with Tapered Seat
8-11 ft lb.	12-15 ft lb.	19-22 ft lb.	12-15 ft lb.	20-23 ft lb.	14-17 ft lb.

Spark Plug sizes removeable with the Scrench

Screnches are primarily designed to remove 10mm and 12mm Spark Plugs which are commonly used in small gas engine tools such as Chainsaws, Weed Wackers and Leaf Blowers. Screnches may not fit the spark plugs used in your Lawnmower or Car or Motorcycle. These may use Spark Plugs requiring 21mm or 13/16" wrench size or 27mm or 1-1/8" wrench size. The chart below summarizes the different thread styles for SAE Standard spark plugs.

Spark Plug Thread Size	Wrench Size in mm	Wrench Size in Inches
M18 x 1.5	27	1-1/8"
M14 x 1.25	22	7/8"
M12 x 1.25	19	3/4"
M10 x 1.0	17	5/8"

Torx fasteners used in Modern Chainsaws and other Gas Engine powered devices

Some chain saws manufacturers such as Stihl and Oregon have started using "Torx" fasteners on their models. Screnches have been made with the T-27 Torx bit that is required. This chart gives you a cross reference between existing fasteners and Torx fasteners. The chart will tell what size bolts you are likely to find in your saw if the T-27 bit fits them.

**TORX SCREW SIZE CHART**
Screw Size	Torx Socket Set Screw	Torx Socket Cap Screw	Torx Pan Head Screw	Torx Flat Head Screw	Torx Fillister Head Screw	Torx Truss Head Screw	Torx Oval Head Screw	Torx Hex Head Screw	Torx Internal Washer Head Screw
#2	T3	-	T7	T6	-	-	-	-	T7
#3	T5	-	T8	T7	-	-	-	-	T8
#4	T6	T10	T9	T8	T9	-	-	T9	T9
#5	T7	T10	T10	T9	T10	-	T10	T10	T10
#6	T7	T15	T15	T10	T15	T10	T15	T15	T15
#8	T8	T25	T20	T15	T20	T15	T20	T20	T20
#10	T10	T27	T25	T20	T25	T20	T25	T25	T25
#12	T10	T27	T27	T25	T27	T25	T27	T27	T27
1/4	T20	T30	T30	T27	T30	T27	T30	T30	T30
5/16	T27	T45	-	T40	T40	T30	T40	T40	-
3/8	T30	T50	T45	T40	T45	T40	T45	T45	-
7/16	T40	T55	T50	T50	T50	T45	T50	-	-
1/2	T45	T55	T55	T55	T55	T50	T50	-	-

The Scrench Page

19 X 10 SCRENCHES