There are basically two types of wrenches or spanners, one is a wrench that has fixed opening size marked on it, while the other is a wrench with adjuastable opening size. 

Our Adjustable Hook Spanners/Wrenches (Adjustable C Spanners/Wrenches) facilitate the easy and safe tightening and loosening of KM, KML, N, AN, KMK, KMFE, KMTand KMTA nuts. The spanners are made of special hardened steel for durability. One hook spanner covers several nut sizes, making it suitable for use with many applications.

Product Name: Adjustable Hook Spanners/Wrenches

Head Type: Square Head

Features of Adjustable Hook Wrenches:

• Money-saving solution: 1 hook wrench covers a lot of nut sizes

• Versatile: suitable for N, AN, KM, KML, KMK, KMFE, KMT & KMTA Nuts

• Hole in the adjustable hook wrench's handle facilitates easy storage

• High-quality Chrome Vanadium Steel material provides maximum strength and durability
  

• Minimizes shafts and nuts damage

Both fixed and adjustable hook spanners(round head & square head)/wrenches are available.

Drawing and Technical Parameters of the Square Head Adjustable Hook Wrenches/C Shape Spanners

Square Head Hook Wrenches No.	Thread					Applicable Nuts
	DM	L	S	F
YC19-50	M12-30	166	6.5	9	13	KM 1, KM 2, KM 3, KM 4, KM 5, KM 6, KMT 1, KMT 2, KMT 3, KMT 4, KMT 5, KMT 6
YC32-76	M20-55	208	7	10	15.5	KM4, KM5, KM6, KM7, KM8, KM9, KM10, KM11, KMT4, KMT 5, KMT6 ,KMT7, KMT8, KMT9, KMT10, KMT11, KMTA5, KMTA6, KMTA7, KMTA8, KMTA9, KMTA10, KMTA11
YC50-120	M33-90	290	8.5	12	18	KM 7, KM 8, KM 9, KM 10, KM 11, KM 12, KM 13, KM 14, KM 15 ,KM 16, KM 17, KM 18, KMT 7, KMT 8, KMT 9, KMT 10, KMT 11, KMT 12, KMT 13, KMT 14, KMT 15, KMT 16, KMT 17, KMT 18, KMTA 7, KMTA 8, KMTA 9, KMTA 10, KMTA 11, KMTA 12, KMTA 13, KMTA 14, KMTA 15, KMTA 16, KMTA 17, KMTA 18

Founded in 1999, HOLK Bearing leads the way in the design and manufacture of quality Bearing Housings and Bearing Adapter Sleeves/Withdrawal Sleeves, we pride ourselves on an immediate and dedicated response to standard and special bearing housing solutions. 

HOLK's max bearing housing fabrication capability: up to 5 tons/pc

We produce top-notch quality Split Plummer Blocks worth more than US$1,000,000 to a big famous European bearing company every year.

We manufacture premium quality Bearing Adapter Sleeves worth more than US$500,000 to a big famous European bearing company every year.