Allen Front Engine Plate Bolt,

MS850 · May 12, 2016

Greeting from NoCal,
Does anyone make a Allen Front Engine Plate Bolt, maybe a Stainless one. Standard size is 1/2 x 20

DogT · May 12, 2016

Be careful about any old SS bolt there, those engine mounting studs/bolts need to be very good. Rocky Point sells SS engine hardware. That bolt can be a pain in the butt.

MS850 · May 12, 2016

DogT said:
Be careful about any old SS bolt there, those engine mounting studs/bolts need to be very good. Rocky Point sells SS engine hardware. That bolt can be a pain in the butt.

thanks for getting back,
SS is not a requirement , my local Ace Hardware doesn't have a long enough bolt. 7 1/2" is the total length. I swear I've seen one either for sale or on a bike in my journeys around the internet.

DogT · May 12, 2016

I hadn't thought about an Allen bolt there, if you can find a grade 8 or better it might be good. I think it's 1/2x20.

bwolfie · May 12, 2016

Check Grainger or Fastenal.

MS850 · May 12, 2016

Ill do some investigating and report back.
Ill be watching NBA playoffs and game 7 Sharks hockey. So ill be busy tonight.

Saber13 · May 12, 2016

Try Bolt Depot on line. They have just about everything. I haven't tried that size yet, but have gotten a lot of other SS for my MKIII.

Hortons Norton · May 12, 2016

Or these guys, been using them for years. They have a huge selection of all types and grades. http://www.allensfasteners.com

DogT · May 13, 2016

I've bought stuff from theboltdepot, but I wouldn't buy a bolt for the engine mount there.

grandpaul · May 13, 2016

I know Windy (bill) uses one with his front steady (recommended upgrade, by the way)

Come to think of it, that would make his bolt about 1/2" longer than stock, because it mounts the front steady in place there.

batrider · May 13, 2016

grandpaul said:
I know Windy (bill) uses one with his front steady (recommended upgrade, by the way)

Come to think of it, that would make his bolt about 1/2" longer than stock, because it mounts the front steady in place there.

Windy's front link rod setup does not connect to the big iso bolt.

MS850 · May 13, 2016

Well the only place I found with Allen Bolts long enough (7.5") was this place and the bolt is 13-tpi not the standard 20-tpi. Not sure how it measures up to the stock bolt as far as hardness.

http://www.albanycountyfasteners.com/Socket-Head-Cap-1-2-13-Screws-Stainless-Steel-p/36000.htm

grandpaul · May 13, 2016

batrider said:
Windy's front link rod setup does not connect to the big iso bolt.

Ah, so.

It's been a few years, I forgot.

WZ507 · May 13, 2016

MS850 said:
Well the only place I found with Allen Bolts long enough (7.5") was this place and the bolt is 13-tpi not the standard 20-tpi. Not sure how it measures up to the stock bolt as far as hardness.

http://www.albanycountyfasteners.com/Socket-Head-Cap-1-2-13-Screws-Stainless-Steel-p/36000.htm

McMaster-Carr has the subject SS socket head cap screw in 304 (18/8) SS in 1/2"-13 up to 12" in length

http://www.mcmaster.com/#socket-head-cap-screws/=12e6erg

peter12 · May 13, 2016

Middleton & Son UK, do the full set in stainless, not sure about Allen head though.

PeterJoe · May 13, 2016

I wonder if an Allen headed bolt would even work for your application because the diameter of the head of an allen bolt is 3/4 inch. The original bolt hex head is 5/8 of an inch across the flats. I would think you would have to grind the side of an allen bolt head to even get past the engine case. Not only that the height of an allen bolt head is 1/2 inches. So once the allen bolt is set you would have to make sure that it wouldn't turn and interfere with the engine case. The original hex headed bolt is somewhat special because it has a reduced head size that would use a 5/8 inch wrench instead of the standard 3/4 inch hex. I would be inclined to go with the original Andover-Norton engine mount bolt.

What I found that works very well to hold the original bolt head from turning is to use a modified deep offset 5/8 inch box end wrench. The modified wrench has a ground taper on the top part of the wrench so that the narrowest end is about 1/4 inch high. Here is a side view of the finished wrench:

Engine Bolt Wrench Side View

Here is a picture of the wrench in action:

Engine Bolt Wrench

MS850 · May 13, 2016

I ordered a set of three. with nuts and washers.
Ill let you know how they fit and if ok, I'll sell the other two at cost plus shipping.
If anyone is interested.

Order Details:

Code Item Qty Price Grand Total
36222 Socket Cap Screws 304 SS - 1/2-13 x 7-1/2 (PT) Qty- 3 $11.06 $33.18

128172 Nylon Lock Nut 304 SS - 1/2-13 (.752 Flats x .609 Height) Qty-3 $0.56 $1.68

1000-200019-0001 1/2"-818-SAE MS Flat Washers, ID .531, OD 1.062 18-8 SS - Qty-6 $0.21 $1.26

river700 · May 13, 2016

Fastenal shows a 1/2x 20= 7 1/2". Right across the river in Winona, MN. Rick

https://www.fastenal.com/products/faste ... 0~|sattr04:^1/2%22-20$|~

MS850 · May 13, 2016

PeterJoe said:
I wonder if an Allen headed bolt would even work for your application because the diameter of the head of an allen bolt is 3/4 inch. The original bolt hex head is 5/8 of an inch across the flats. I would think you would have to grind the side of an allen bolt head to even get past the engine case. Not only that the height of an allen bolt head is 1/2 inches. So once the allen bolt is set you would have to make sure that it wouldn't turn and interfere with the engine case. The original hex headed bolt is somewhat special because it has a reduced head size that would use a 5/8 inch wrench instead of the standard 3/4 inch hex. I would be inclined to go with the original Andover-Norton engine mount bolt.

What I found that works very well to hold the original bolt head from turning is to use a modified deep offset 5/8 inch box end wrench. The modified wrench has a ground taper on the top part of the wrench so that the narrowest end is about 1/4 inch high. Here is a side view of the finished wrench:

Engine Bolt Wrench Side View

Here is a picture of the wrench in action:

Engine Bolt Wrench

Thats a good idea with the wrench. If the Allen bolt doesn't fit ill be doing your suggestion.
Thanks

RoadScholar · May 16, 2016

Rocky Point Cycle has been making these fasteners locally out of 316 for years, they are machined out of bar stock, rather than hex stock so that all surfaces are machined, the heads are hexagonal, the 20 tpi threads are cut as par of the CNC machining process, the finish is satin and is easily polished, if you choose.

Allen Front Engine Plate Bolt,

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