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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 pivot bolt torque value		  New Topic  Topic Locked
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JamesBird
1st Mate

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USA
68 Posts
Initially Posted - 05/22/2016 :  08:54:15  Show Profile
I am confused (as many others) on what the torque value for the pivot pin hanger bolts should be. Catalina specifies 35 ft lbs but everything I find concerning MAX torque values for 3/8x16 316 stainless bolts says 247 in lbs or 21 ft lbs. See link below.

http://www.engineersedge.com/torque_table_sae.htm

I torqued the bolts to 35lbs as Catalina recommends but now I'm worried they may be over torqued and could fail. Any engineers out there?
Jim
Danvers, MA
79 Cat25/SR/SK/(1185)

Dave5041
Former Mainsheet Editor

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USA
3754 Posts
Response Posted - 05/23/2016 :  14:23:15  Show Profile
I think you'll be OK as long as they aren't hardware store variety bolts. 316 come in several flavors and can cover the range of grade 2 to grade 5 steel bolts. Rest assured that the SS bolts you buy at Lowe's and Home Depot will rust and won't take higher torque values.

Edit:
Pearl hasn't broken a bolt yet.

Dave B. aboard Pearl
1982 TR/SK/Trad. #3399
Lake Erie/Florida Panhandle
Edited by - Dave5041 on 05/23/2016 14:24:07
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JamesBird
1st Mate

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USA
68 Posts
Response Posted - 05/26/2016 :  18:44:40  Show Profile
ok guys. I contacted Catalina Yachts and spoke to Warren Pandy in technical support. He was very helpful and got back to me in just two days. He said no one had ever questioned the 35 lb torque on the 3/8 bolts for the Cat 25 pivot hangers so some research was required with engineering. The following is verbatim from Mr. Pandy.


Jim,

I just got a call from Gerry Douglas. We also checked our current charts and he said you can go with the (20.6) or 21 ft/lb recommendation.

We suspect that over the years that more than a few owners have torqued theirs to the 35 ft/lbs. that the late 70’s manual shows, but due to the fact that the breaking strength is always much higher (usually a 2 or 2.5 factor) than the recommended torque value, that it has never been a problem.

However, since you have already torqued yours to 35 ft/lbs, you would not want to simply back them off by 10 to 14 ft/lbs as those bolts have already been “stretched” or taken a set to the 35 ft/lbs. If you do decide to re-do the torque # you should use new bolts and re-set those with Lock-Tite again.

Best regards,
Warren Pandy
Warren@catalinayachts.com

Note: Gerry Douglas is one of the engineers involved with the development of the C22 and C25 models and has been with Catalina since the 70's.

I will be replacing the bolts and torque them to 21 lbs.




Jim
Danvers, MA
79 Cat25/SR/SK/(1185)
Edited by - JamesBird on 05/26/2016 18:48:42
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jmczzz
1st Mate

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USA
92 Posts
Response Posted - 05/26/2016 :  20:29:44  Show Profile
Jim, Thanks for staying after this. Good Work,
JMc
1978 C25 SK SR # 808
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 05/27/2016 :  01:35:28  Show Profile
Nice follow-up work there Jim.

1989 C25 TR/WK, #5822
1973 McVay Minuet 19
1975 Jester 12
1981 C25 SR/SK, #2428
1981 C22 SR/SK,
Tanzer 16
Sunfish

"There is nothing, absolutely nothing half so much worth doing as simply messing about in boats." Kenneth Grahame
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.