X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 20 Jul 2014 08:26:08 -0400 Message-ID: X-Original-Return-Path: Received: from rc4-smtp.comporium.net ([208.104.2.9] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 6986737 for lml@lancaironline.net; Sat, 19 Jul 2014 17:02:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=208.104.2.9; envelope-from=snopercod@comporium.net Received: from rg20.comporium.net ([208.104.244.60]) by rc4-smtp.comporium.net ({f885e408-6373-4fe1-96b5-c2a14748506e}) via TCP (outbound) with ESMTP id 20140719210142710 for ; Sat, 19 Jul 2014 21:01:42 +0000 X-RC-FROM: X-RC-RCPT: Received: from 208-104-132-203.brvd.dsl.dyn.comporium.net (EHLO _127.0.0.1_) ([208.104.132.203]) by rg20.comporium.net (MOS 4.3.4-GA FastPath queued) with ESMTP id BTQ49202 (AUTH snopercod); Sat, 19 Jul 2014 17:01:42 -0400 (EDT) X-Original-Message-ID: <53CADCAB.4040600@comporium.net> X-Original-Date: Sat, 19 Jul 2014 17:01:31 -0400 From: John Cooper User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Nicopress oval sleeves - copper, tin plated, or zinc plated? Content-Type: multipart/alternative; boundary="------------030204050506080104090504" X-MAG-OUTBOUND: comporium.redcondor.net@208.104.244.48/28 This is a multi-part message in MIME format. --------------030204050506080104090504 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Since one of my Nicopress sleeves failed, I've learned more than I want to know about these things. Nicopress recommends using the 428 series *tin-plated* sleeves on stainless steel cable, but Lancair sells the 18 series plain copper sleeves. Aircraft Spruce doesn't sell the tin-plated sleeves in America (they do in Europe), but instead they sell the 28 series *zinc-plated* and the 18 series *plain copper* sleeves. The only company in America that I can find who sells the *Nicopress *tin-plated sleeves is VER, and they have a $50 minimum order so I would have to buy 200 sleeves. Grainger sells some off brand tin-plated sleeves made in China. Do I really want to use those? I don't think so. The copper alloy is crucial to the longevity of the crimp, I think, and who knows what I would be getting. McMaster-Carr sells some "TIN-Plated Copper Oval Compression Sleeve for 3/32" Rope Diameter, 3/8" Sleeve Length". No Country of origin listed, but they do say "All sleeves meet MIL-STD 51844". Unfortunately, the length before crimping is listed at 3/8" rather than the 7/16" that MS51844 Rev. E calls for. So I'm flummoxed. Does anyone know of a source for the *authentic, Mil spec. *Nicopress 428-3-VG *tin plated* oval crimp sleeves for 3/32" stainless steel cable? OTOH, does the plating really matter? Is galvanic corrosion really a concern in the foot-well? I noted that my failed copper crimp sleeve had blue copper corrosion all over it. Sure, I used the wrong tool originally, but could corrosion have been a factor in the failure? Possibly, according to this Kitplane article The Big Squeeze . It's a great article from 2013 answers a lot of my questions, including: > Why three types? The idea is to match sleeve and cable finish for the > least damaging galvanic potential between components. While any copper > sleeve choice will initially withstand the rated load when installed > on either galvanized or stainless cable, corrosion will weaken the > mechanical joint given time, the wrong environment, and the wrong > combination of materials. The specifications are quite specific. Bare > copper or zinc-plated sleeves are used on galvanized carbon steel > cable. *Tin-plated sleeves (or as noted previously, stainless steel > sleeves) are used on stainless cable. There are no exceptions.* and... > *Zinc-plated sleeves on stainless cable has been an obsolete > recommendation**/for more than 40 years./* --------------030204050506080104090504 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Since one of my Nicopress sleeves failed, I've learned more than I want to know about these things. Nicopress recommends using the 428 series tin-plated sleeves on stainless steel cable, but Lancair sells the 18 series plain copper sleeves. Aircraft Spruce doesn't sell the tin-plated sleeves in America (they do in Europe), but instead they sell the 28 series zinc-plated and the 18 series plain copper sleeves. The only company in America that I can find who sells the Nicopress tin-plated sleeves is VER, and they have a $50 minimum order so I would have to buy 200 sleeves. Grainger sells some off brand tin-plated sleeves made in China. Do I really want to use those? I don't think so. The copper alloy is crucial to the longevity of the crimp, I think, and who knows what I would be getting. McMaster-Carr sells some "TIN-Plated Copper Oval Compression Sleeve for 3/32" Rope Diameter, 3/8" Sleeve Length". No Country of origin listed, but they do say "All sleeves meet MIL-STD 51844". Unfortunately, the length before crimping is listed at 3/8" rather than the 7/16" that MS51844 Rev. E calls for. So I'm flummoxed.

Does anyone know of a source for the authentic, Mil spec. Nicopress 428-3-VG tin plated oval crimp sleeves for 3/32" stainless steel cable?

OTOH, does the plating really matter? Is galvanic corrosion really a concern in the foot-well? I noted that my failed copper crimp sleeve had blue copper corrosion all over it. Sure, I used the wrong tool originally, but could corrosion have been a factor in the failure? Possibly, according to this Kitplane article The Big Squeeze. It's a great article from 2013 answers a lot of my questions, including:

Why three types? The idea is to match sleeve and cable finish for the least damaging galvanic potential between components. While any copper sleeve choice will initially withstand the rated load when installed on either galvanized or stainless cable, corrosion will weaken the mechanical joint given time, the wrong environment, and the wrong combination of materials. The specifications are quite specific. Bare copper or zinc-plated sleeves are used on galvanized carbon steel cable. Tin-plated sleeves (or as noted previously, stainless steel sleeves) are used on stainless cable. There are no exceptions.

and...
Zinc-plated sleeves on stainless cable has been an obsolete recommendation for more than 40 years.

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