Metric Gears Specifications

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Gear Type


	Gear Type
	Your choices are...
	Spur Gear		Spur gears are straight-toothed gears with radial teeth that transmit power and motion between parallel axes.
	Change Gear		Change gears are hubless devices with a keyway that mates with a hub for rapid changing. They are used in machines where the gear ratio is changed frequently. Change gears resemble spur gears.
	Cluster Gear		Cluster gears are spur gears with an integral hub whose end can accept a second, hubless gear.
	Helical Gear		Helical gears are helical-toothed devices that transmit power and motion between parallel axes (opposite hand) or right-angle axes (same-hand).
	Herringbone Gear		Herringbone gears have teeth with two opposing helices. They transmit power and motion between parallel axes, and sometimes include a center groove.
	Miter / Bevel Gear		Miter and bevel gears have conical faces that operate on intersecting axes. Miter gears are bevel gears with a 1:1 ratio operating on right axes. Conical face; operate on intersecting axes which are often at right angles.
	Miter / Bevel Gear Set		Miter and bevel gear sets are matched gears with defined ratios.
	Hypoid Gear		Hypoid gears have specially formed teeth on a circular face. They are similar to bevel gears, but are driven by a worm-like drive on non-intersecting axes.
	Differential End Gear		Differential end gears mate with a differential assembly.
	Internal Gear		Internal gears have teeth that point towards the center. They mate with spur gears.
	Worm		Worms are cylindrical gears with a spiral thread. They operate on non-intersecting right-angle axes. Worm gears drive mating worm wheels in applications with large speed ratios. They are used for speed reduction or increase, torque multiplication and resolution, and accuracy enhancement for positioning systems.
	Worm Wheel		Worm wheels are driven by worms or worm gears.
	Gear Stock / Pinion Wire		Gear stock or pinion wire is a length of rod with gear teeth that can be cut to a required length.
	Gear Blank		Gear blanks may be hobbed or ground to any tooth configuration. The hub and outside diameter (OD) is already formed.
	Rack		Racks are straight components with gear teeth. They mate with pinions (spur gears) and are typically straight-toothed.
	Pinion		Pinions are used to drive racks or larger gears. They can be physically similar to spur gears, and occasionally resemble helical gears. The "pinion" designation is primarily used to indicate that the device is the driving gear in a rack and pinion configuration.
	Other		Other unlisted, specialized, or proprietary gear configurations.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Number of Teeth		The number of teeth helps determines the pitch or module of the gear.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Tooth Form
	Your choices are...
	Straight Teeth		The tooth axis is parallel to the axis of rotation.
	Spiral Teeth		Spiral or helical teeth curve along the gear's face.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Direction		Spiral bevel and miter gears have a right or left hand specification, which describes the direction of tooth curve. If they have spiral teeth, bevel and miter gear sets must have opposite hand specifications to mesh, i.e., a left-hand pinion will drive a right-hand gear and vice versa. Matching items for sets are listed according to the hand specification of the pinion.
	Your choices are...
	Right Hand		The screw advances when turned clockwise. This is the most common or "standard" configuration for spiral or helical teeth.
	Left Hand		The screw advances when turned counterclockwise. This is an unusual or specialty configuration.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Gear Center
	Your choices are...
	Center Bore		The gear has a circular, center bore for mounting onto a shaft.
	Integral Shaft		The gear is on a non-separable, cylindrical center shaft.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Pressure Angle:		Pressure angle is the angle between the line of force or action and the tangent to the pitch circle at the point of mesh. The most common pressure angles for gears are 14.5° and 20°, while some worms and worm gears utilize a 25° pressure angle. Gears must have the same pressure angle to mesh.
	Your choices are...
	14.5°		The gear has a pressure angle of 14.5°.
	20°		The gear has a pressure angle of 20°.
	25°		The gear has a pressure angle of 25°.
	Other PA		Other unlisted pressure angles.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Gear Features
	Your choices are...
	Anti-backlash		Anti-backlash gears have a mechanical assist such as a spring to take up any play between meshing gear teeth, thus avoiding backlash when gear direction changes.
	Ground Teeth		Ground teeth provide smoother, higher-precision tooth form.
	Integral Rack and Rail		Rack teeth are machined or ground directly onto the moving element to increase power transmission efficiency.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Metric Size Specifications


	Pitch Diameter		The diameter of tooth drive action.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Face Width		The width of the teeth (or length of a worm thread).
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Length		The length of a rack or piece of gear stock. Not a valid specification for other gear styles.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	*Bore Diameter (if applicable)*		The diameter of the desired center bore through the gear.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	*Shaft Diameter (if applicable)*		The diameter of the desired non-separable center shaft.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Material


	Metal:
	Your choices are...
	Aluminum		Aluminum is a bluish, silver-white, malleable, ductile, light, trivalent, metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation. It is lighter than steel, but not as strong.
	Brass		Brass comes with good strength, excellent high temperature ductility and reasonable cold ductility, good electrical conductivity, excellent corrosion resistance, good bearing properties, and low magnetic permeability.
	Bronze		Bronze is a copper base alloy that consists of copper as the main alloying metal and one or more other metals, such as tin, zinc, or phosphorus. Silicon bronze is a typical bronze alloy.
	Cast Iron		Cast iron is a very durable iron alloy with high amounts of carbon. Types include ductile iron, gray iron and white cast iron grades. Differences in grades are due to variations in composition and processing.
	Carbon / Alloy Steel		Steel is a commercial iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. Many grades of carbon and alloy steel are available. They may require coating to protect against corrosion, however.
	Hardened Steel		Steel may be hardened in a number of ways. These include a variety of quenching techniques in oil and water, passing the steel through induction chambers, etc. Quickly cooling steel during processing freezes, traps and packs the carbon atoms inside the shrunken iron crystals, thereby producing a very hard and brittle metal. Although very hard, it cannot absorb much shock or impact without breaking.
	Stainless Steel		Stainless steel is chemical and corrosion resistant and can have relatively high stress ratings. Most stainless steels cannot be hardened to the same degree as carbon steels.
	Other Metal		Other unlisted, specialized, or proprietary metals or alloys.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Plastic:
	Your choices are...
	Acetal		Acetal is a stable plastic material with inherent self-lubricating properties that can be enhanced with lubricating fillers.
	Delrin		Delrin is an engineered plastic with a good combination of toughness, stiffness, wear and abrasion resistance, and low frictional characteristics.
	Nylon		Nylon, comprising several grades of polyamides, is a general-purpose material in wide use. It is tough and resistant and has good pressure ratings.
	Polycarbonate		Polycarbonate is an extremely tough polymer that can be machined to close tolerances. Lubrication is sometimes needed, as the wear properties of polycarbonate are not as good as some other polymers.
	Other Plastic		Other unlisted or specialized polymers or plastic materials.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Plastic Teeth with Metal Insert		Gears made with a combination of materials offer the strength and good fit of a metal hub and/or web with the properties of plastic teeth. These include quieter running and greater fit tolerances.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

Mounting Features


			A hub is a cylindrical projection from one or both sides of the gear, typically for the provision of a shaft attachment mechanism such as a set screw. Hubless gears are typically attached via a press-fit, adhesive, or an internal keyway.
	Your choices are...
	Hubless		No mounting hub.
	Hub		The hub is an extension of the gear body and allows shaft mounting options.
	Keyway		One or more square-edged cutouts are designed to mate with a shaft key.
	Set Screw(s)		Screws tighten directly onto a shaft for gear attachment.
	Hub Clamping Screw		The gear is attached with a screw that squeezes the inner diameter of the hub to a tight fit around the shaft.
	*Split (Requires Clamp)*		The hub is split into several pieces that are tightened down by a separate clamp to grip the shaft.
	Simple Bore		Simple bores are used typically for press-fit or adhesive attachments.
	Other		Other unlisted or specialized shaft attachment mechanisms.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Metric Gears Specifications

Gear Type:

Number of Teeth:

Tooth Form:

Direction:

Gear Center:

Pressure Angle:

Gear Features:

Pitch Diameter:

Face Width:

Length:

Bore Diameter (if applicable):

Shaft Diameter (if applicable):

Metal:

Plastic:

Plastic Teeth with Metal Insert?

Mounting Features:

Help with Metric Gears specifications: