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Topic: bumber & nerfs material?
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Page 1 of 1 of 2 replies
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May 03, 2007 at
07:49:39 PM
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12/02/2004
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1118
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Does anyone make them out of 4130 or are they all made out of stainless? and why?
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May 03, 2007 at
08:16:10 PM
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7918
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I know that 4130 is too strong to be practical. If you make contact with 4130 you could do some damage to the frame, so you go to a softer material that's cheap which will cushion the impact. $100 nerf saving $3-? frame. Stainless doesn't rust so to speak and is very easy to get.
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May 03, 2007 at
09:49:56 PM
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05/03/2007
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Reply to:
Posted By: brian26 on May 03 2007 at 08:16:10 PM
I know that 4130 is too strong to be practical. If you make contact with 4130 you could do some damage to the frame, so you go to a softer material that's cheap which will cushion the impact. $100 nerf saving $3-? frame. Stainless doesn't rust so to speak and is very easy to get.
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Not true.
Historically most nerfs and bumpers have been made from 4130. Generally 1" x .065 wall thickness is used for sprints and 7/8" x .065 wall is used on midgets. The 4130 nerfs are nickel plated most of the time and are more durable than the stainless. They are definitely not too strong and will not damage the frame unless they are built with excessive cross bracing or gussets. The trend toward stainless nerfs and bumpers is more of a recent change (last 5 to 10 years). They are not as durable, but are slightly cheaper. While the raw stainless is a bit more expensive than 4130, the plating cost puts the end expense of the chromoly bars higher. Also, those building their own bars will often not want to deal with the extra time and hassle that plating the 4130 tubing entails.
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