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Message started by vargas on 08/19/08 at 07:14:36

Title: white spacer material
Post by vargas on 08/19/08 at 07:14:36

what is the white spacer made from? I only ask becauseI work at a machine shop that makes , from time to time, a part with nearly identical dimensions from Brass. Since it's a cnc machine i could probably run offquite a few with thicknesses .010apart from .080 to .030.

Title: Re: white spacer material
Post by LANCER on 08/19/08 at 07:23:08

That is an interesting thought. What is the estimated cost/piece ?

Title: Re: white spacer material
Post by rokrover on 08/19/08 at 07:26:28

My guess is the original is either nylon or delrin (a polyacetal). These are fuel-resistant self-lubricating plastics with good dimensional stability (also used to injection mold gears). The end is rounded a bit, perhaps to allow the needle to align better.

Title: Re: white spacer material
Post by vargas on 08/19/08 at 07:46:56

can't quote cost untill i know if brass is too hard .

Title: Re: white spacer material
Post by clueless on 08/19/08 at 08:50:10

I'm using brass washers in place of spacer.

Title: Re: white spacer material
Post by Rogue_Cheddar on 08/19/08 at 09:51:37

I'm using stainless steel 3mm washers in place of spacer. (ACE Hardware)

Title: Re: white spacer material
Post by serowbot on 08/19/08 at 10:00:06

Ace hardware also has a nylon washer that is 66% of the stock spacer. That's what I used,... hope it is gas tolerant.

Title: Re: white spacer material
Post by EssForty on 08/19/08 at 14:02:48

594F58455D48455E2A0 wrote:

Ace hardware also has a nylon washer that is 66% of the stock spacer. That's what I used,... hope it is gas tolerant.

Most nylon grades have good gasoline resistance. You're probably OK.

Among the plastics, Delrin, would be my choice material. Good chemical resistance and ideal as a washer. I haven't taken a look at the spacer so I am not sure what material it is made of.

Other choices would include olefins, which have a very high resistance to liquid gasoline. Glass-reinforced polypropylene would give good physical properties for a washer. High density polyethylene is commonly used for blow molded gasoline tanks, but the physical properties may not be ideal for a washer.

Brass and some other metals have good corrosion resistance to gas and should be fine but I'd stick with a plastic washer if possible. There are a number of properties that engineers design for and unless you know them all you might be making a trade-off in long term longevity.