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For school science projects. Four sets of 1.58mm thick cardboard wheels. Four of each size, 25mm, 38mm, 51mm and 63mm diameters. 5mm hole in center of each wheel. White on front side, cardboard on ... CAT# CW-16
$2.25 set
Quantity:  
Four matched unbreakable plastic gears. The three larger gears are beveled on one side and can mesh at 90 degrees as well as the normal 180 degree angle. They have 5mm bores. Inserts are supplie... CAT# GR-86
$2.25 each
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42 tooth sprocket for #25 roller chain. 3.5" diameter. Attaches to 10mm (0.4") diameter half-moon shaft. 0.42" collar. CAT# GR-123
$2.00 each
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Steel axle. 12" long x 1/8" (3mm) diameter. CAT# AXL-12
$1.00 each
Quantity:  
 
Velleman Kits # KNS7. Fun with gears and motors. Small 3 Vdc motor, metal bracket and axles, and an assortment of small plastic gears and collars to produce a gear train of various ratios. Note: ... CAT# GR-84
$11.95 each
Quantity:  
12 x 18 x 16mm one-way needle bearing. Includes 12mm adapter for 8mm shaft with 10mm shank. CAT# BR-14
$2.00 each
10 or more    $1.50 each
Quantity:  
 
0.1" diameter thick x 2.6" overall diameter. CAT# FT-3
2 for $1.00
Quantity:  
Minimum order of 2 pieces .
Experimenter's Delight - Removed from used assembly. A belt-driven slotted shaft that probably caused a piston to oscillate attached to an optical encoder. Rotates in one direction only. 50mm long ... CAT# ENC-1
$0.50 each
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For school science projects. A set of two front and two rear plastic model race car wheels. Rear wheels, 40mm diameter x 17mm wide. Front wheels 34mm diameter x 4.5mm wide. Accepts 3mm diameter axl... CAT# DWH-1
$2.75 set
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For school science projects. Set of three red plastic pulleys, 50mm, 38mm, 25mm with 4mm hole. For axles see CAT#s AXL-12, AXL-25. CAT# PLY-3
$2.00 set
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Five matched break-resistant plastic gears ranging from 0.44" diameter (10 teeth) to 2.02" (50 teeth). Gears are molded with 0.15" (4mm) bores and come with inserts which reduce the bore to 0.075" ... CAT# GR-5
$3.50 each
10 or more    $3.00 each
Quantity:  
Shaft diameter 8mm. Thread diameter 12mm. Thread length 79mm. Overall length 130mm. 9 threads per inch. CAT# SFT-11
$1.25 each
10 or more    $1.00 each
Quantity:  
 
Two 22-cog, 1.17" diameter nylon gears with 5.8" stainless steel axle. The 0.25" diameter axle is attached to one gear. The other end is flatted and mates with the other gear. CAT# GR-40
$1.00 each
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Set of two metal axles, 2.5" long x 1/8" diameter (63mm x 3mm). CAT# AXL-25
$0.50 pair
Quantity:  
 
 
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