Ceramic sleeves / aluminium oxide 92

Back to the Category Plastic Washers/Plastic Sleeves

Technical Drawing - Plastic Washers

Specification Tables - Plastic Washers

■Washer (Alumina 92)

Part Number		V	T	Unit Price
Type	D
CERAW	10	3	3
	12	4
	15	5
	20	6
	25	8
	30	10
	35	12	5
	40	16
	45	20

■Collar with Flange (Alumina 92)

Part Number		L					H	D	Unit Price
Type	V	Selection
CERAB	3	8	10	15			10	6
	4						12	8
	5						15	10
	6						20	10
	8		10	15	20		25	12
	10						30	14
	12			15	20	25	35	20
	16						40	20
	20						45	25

■Collar (Alumina 92)

Part Number		L	D	Unit Price
Type	V	1mm Increment		L5~29	L30~54	L55~79	L80~100
CERAC	3	5~50	6			-	-
	4		8
	5		10
	6		10
	8		12
	10		14
	12	5~100	20
	16		20
	20		25

■Washer (Alumina 96)

Part Number		V					T	Unit Price
Type	D	Selection
SCERAW	10	3	4	5			3
	12		4	5	6
	15			5	6	8
	20				6	8

■Sheet (Ceramic Fiber)

Part Number		V Selection					T	Unit Price
Type	D
SWSCE	8	3	4				1
	10	4	5	6
	12	4	5	6	8
	15	5	6	8	10
	20	6	8	10	12
	25	8	10	12	15
	30	8	10	12	15	20

■Property Values of Alumina 92 / Alumina 96 / Ceramic Fiber (Reference: The data in the table are the values of materials.)

Properties Material Name		Alumina 92	Alumina 96	Ceramic Fiber
Dielectric Breakdown Parallel to Lamination	kV/mm	~10	10	-
Volume Resistance Force	Ω-cm	~1014	~1014	-
Bending Strength	kN/cm2	24~34	33	-
Compression Strength	kN/cm2	147~245	210
Tensile Strength	MPa	1000~1200	1500	0.6
Expansion Coefficient	1/°C	8x10-6	7.6x10-6	-
Thermal Conductivity	cal/cm • sec • °C	3.6~5.0x10-2	5.0x10-2	1.7x10-4
Heat Resistance	°C	1000~1200	1500	1300
Water Absorption Ratio	%	0	0	-
Specific Gravity	-	3.7	3.8	0.25
Main Material	-	Al2O3(92%)	Al2O3(96%)	-

These materials are fragile. Please handle with care.

General Information - Plastic Washers

Selection details of plastic washers/plastic sleeves

- Material: MC-nylon, polyacetal (POM), Bakelit, epoxy glass, polyether ether ketone (PEEK), fluoroplastic, polyslider, ceramic, polycarbonate (PC), polyamide (PA), polytetrafluoroethylene (PTFE), Duracon, Duranex, ABS, glass (lime-sodium glass)

- Outer diameter: 2 to 100 mm

- Inner diameter: 1 to 90 mm

- Thickness, length: 0.1 to 500 mm

- Forms: cylindrical, with collar, with pins, with countersunk bore, with guide, square washers

Description/Basics of plastic washers/plastic sleeves

Sleeves in general, are among the most commonly used machine elements to create a distance between two components. Plastic sleeves and ceramic sleeves offer added value compared to conventional metal collars.

Plastic sleeves and plastic sleeves with a collar have some advantages over their metallic counterparts. In addition to creating and maintaining a distance, they also have an insulating effect. The insulation effect refers to thermal insulation or electrical insulation depending on the material. In addition, their similarity to natural materials is greater than with metal sleeves. As a result, plastic washers and plastic sleeves (depending on the material) expand to the same extent under the influence of heat, such as wood or similar soft materials.

Plastic washers, as well as washers, enable an increase in surface compression. However, their resistance to pressure loads is lower depending on the material selected than that of a similarly large metal washer. For this purpose, the advantage of thermal and electrical insulation effects exists in plastic washers.

MISUMI also offers plastic washers and plastic sleeves with gliding properties. For example, washers and sleeves made of fluoroplastics are suitable for reducing friction resistances in hinge constructions. It should be noted that plastic sleeves do not replace plain bearings.

Polyether ether ketone (PEEK) has excellent thermal insulating properties. Depending on the strength and material composition, PEEK has a melting point of up to 300°C. It is therefore suitable, among other things, for insulating heating and cooling lines, for example. Due to the quality of the surface, the material has particularly good adhesive properties.

Polyacetal, also called POM, is characterized by its very good machinability and excellent mechanical properties. Polyacetal (POM) products are widely used in various branches of mechanical engineering.

At MISUMI you will find washers and sleeves made of various variants of MC Nylon. In addition to the standard version, a conductive and antistatic type is also offered. Thus, MC Nylon can be used in a wide variety of applications.

The different versions and shapes of the plastic washers and plastic sleeves allow utilising them in a wide variety of applications. Thus, plastic washers can be used, for example, as bearing mountings up to the assembly of printed circuit boards.

Application Examples

Plastic sleeve as thermally insulating spacer sleeve
(1) Plastic sleeves, (2) Cylindrical plastic sleeve, (3) Plastic washer, (4) Hexagon socket screws, (5) Washer, (6) Hexagon nut

Plastic sleeve as bearing ring
(1) Plastic sleeve with guide, (2) Rotary shaft, (3) Timing pulley, (4) Ball bearing (5) Bearing with housing, (6) Drive wheel