 Flapper Box Clamp Bolt 914-6 |
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| DennisV |
  Aug 18 2026, 07:40 PM
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#1
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Senior Member  Group: Members Posts: 1,005 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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Is this the correct bolt to secure the flapper box to the heat exchanger on a 914-6? Part number 901-211-631-00. Appears to be NLA. Paired with square nut.
It is what I removed from a pair of used flapper boxes I bought. I tried installing it on a new Dansk flapper / heat exchanger and it appears too short. Even if I try various clamps to compress the flange and close the distance.   |
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| Puebloswatcop |
Aug 18 2026, 07:51 PM
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#2
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Senior Member Group: Members Posts: 1,724 Joined: 27-December 14 From: Mineola, Texas Member No.: 18,258 Region Association: Southwest Region |
Dennis, I tried looking it up in the PET and other resources and it doesn't give a length. It sould be an M6 bolt although that is an assuption based on the fact that it shows the nut on it is M-6. Sorry its not much help, but you can at least check if its M6. if the one you have doesn't meet that spec, then you'll know its not right.
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| bdstone914 |
Aug 19 2026, 03:29 AM
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#3
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bdstone914 Group: Members Posts: 5,354 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(DennisV @ Aug 18 2026, 06:40 PM)  Is this the correct bolt to secure the flapper box to the heat exchanger on a 914-6? Part number 901-211-631-00. Appears to be NLA. Paired with square nut. It is what I removed from a pair of used flapper boxes I bought. I tried installing it on a new Dansk flapper / heat exchanger and it appears too short. Even if I try various clamps to compress the flange and close the distance. I assumed the 4 and 6 flappers took the same bolt. But thevpart number does start with 901. I can check if a 4 flapper fits a 6 exchanger. Im sure i have those bolts to check. Im betting it is the Dansk flapper that is the problem. |
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| rgalla9146 |
Aug 19 2026, 07:50 AM
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#4
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Advanced Member Group: Members Posts: 4,992 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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[quote name='bdstone914' post='3268916' date='Aug 19 2026, 05:29 AM']
[quote name='DennisV' post='3268892' date='Aug 18 2026, 06:40 PM'] Is this the correct bolt to secure the flapper box to the heat exchanger on a 914-6? Part number 901-211-631-00. Appears to be NLA. Paired with square nut. It is what I removed from a pair of used flapper boxes I bought. I tried installing it on a new Dansk flapper / heat exchanger and it appears too short. Even if I try various clamps to compress the flange and close the distance. [/quote] I assumed the 4 and 6 flappers took the same bolt. But thevpart number does start with 901. I can check if a 4 flapper fits a 6 exchanger. Im sure i have those bolts to check. Im betting it is the Dansk flapper that is the problem I agree. The bolt on my flappers is 32mm If the Dansk parts do everything else as they should a longer bolt will do the trick. If you choose to go with OE 6 flappers I have a pair of beauties Oh, one more thing. The bolt extends through the elongated hole. The square nut goes on the round hole side. The round hole side keeps the nut from turning. And one more. Put a flat washer on the elongated hole side to keep the clamp from getting bent. |
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