Will this model work on my 5 speed mountain bike? Thanks

Actually, it should work fine. As someone else stated, the spacing is different between 7 and 5 speed indexing, BUT it is the shifter that does the indexing, NOT the derailluer. So as long as you have the correct shifter on your handle bars or downtube, this should work. The reason the spacing is different is because manufacturers used different chain thicknesses and closer spacing to match as they added more gears within the same basis space. The rear cassette is about the same width between a 5 speed and a 10 speed, the individual cogs are just closer together the more speeds you have. The indexing is handled by the shifter... so if you wish to convert from 5 speed to more in the rear, the parts that change are the shifter at the front and the chain when you go from 5 to 6/7/8, then again to 9 and again to 10. I recently converted a recumbent trike from 7 to 10 speeds in the rear using a Sunrace freewheel and KMC 10-speed chains with MicroShift bar-end 10 speed shifters using a Shimano 9 speed rear derailleur. Shifts great. Only reason I changed the rear derailleur out was due to slop in the 7 speed one that made it not shift or skip shift in certain gears. I used this on my son's hybrid mountain bike for the same reason and it shifts great.

is this a sis derailer?

This is a shimano altus rear derailed

Is the cable adjuster a fastener (using wrench) or a hex screw (using allen key)?

It's a hex screw. We will update the image

Anyone know if this will work with friction shifter?

Yes, friction shifters are a basic shifter equipped on many bikes as long as they are in working order, cables not seized and move freely inside cable housing. This works on old and new bikes regardless of its year as long as the bike has 7 or 8 speed cassettes that would be multiple cogs or sprockets , they have been called attached to the rear wheel.

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⚡ Shift into the future with Shimano Altus precision!

LIGHTWEIGHT DURABILITY - At just 326 grams, this derailleur balances strength and agility for peak riding efficiency.
TEFLON COATED BUSHINGS - Smooth, low-friction performance that extends component life and reduces maintenance.
DIRECT BRAZE ON MOUNTING - Effortless installation with a sleek, integrated design that keeps your bike looking sharp.
SEAMLESS 7 8 SPEED SHIFTING - Experience crisp, reliable gear changes tailored for mountain trails and urban rides alike.
OPTIMIZED CHAIN WRAP CAPACITY - Handles up to 43 teeth for versatile gearing, conquering steep climbs and fast descents.

The Shimano Altus RD-M310 is a high-performance rear derailleur designed for 7/8-speed mountain bikes. Featuring a direct braze-on mount, Teflon-coated bushings for smooth operation, and a lightweight 326g metal build, it delivers reliable, precise shifting with a chain wrap capacity of 43 teeth. Perfect for riders seeking durable, efficient drivetrain upgrades.

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Mounting type	Braze-On Mount
Product dimensions	10.8L x 9.5W x 16.5H centimeters
Manufacturer	Shimano
UPC	689228130913
Global Trade Identification Number	00689228130913
Bike Type	mountain
Color	Silver
Size	7/8spd
Team	Shimano
Weight	2 Pounds
Material Type	Metal
Number of Items	1
Sport	Cycling
Batteries Included?	No
Department	Unisex
Item model number	140779
ASIN	B000FFGTK0

SHIMANO Schal Altus RD-M310 7/8-fach schwarz Fahrrad MTB Direktmontage Bike

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