Search
Better Farming OntarioBetter PorkBetter Farming Prairies

Better Farming Ontario Featured Articles

Better Farming Ontario magazine is published 11 times per year. After each edition is published, we share featured articles online.


Power at Work: So there is such a thing as a Grade 12 bolt

Thursday, June 4, 2009

An update on bolt grades, prompted by an observant reader

by RALPH WINFIELD


After my first article on bolt grading appeared in the December 2008 issue of Better Farming, the phone rang. An observant and knowledgeable reader assured me – very politely, I might add – that I had shortchanged you.

I had said that Grade 8 was the highest grade of bolt available in the imperial system. He assured me that, indeed, a Grade 12 is also available. When I inquired about the use and source, he told me that he regularly uses Grade 12 bolts to attach the bars to the feeder house chains in his combine.

The use of bolts allows him to change damaged bars without removing the feeder house chain.

Many of you will know that the bolts or rivets used to secure feeder house bars are small and short. Thus, there is a need for very high strength bolts capable of retaining high torque without vibrating loose. (I am assuming now that you read my earlier article on torquing bolts.)

This is not an application for lock washers. Lock washers should never be used under the heads or nuts of torqued bolts. They break and come out, leaving the bolt assembly loose – a recipe for disaster in many applications.

Grade 12 or L9 bolts are not available at your local hardware store. They are available from specialized fastener outlets and will cost about double the price of grade eight bolts.

There is no point in using high strength bolts together with low quality nuts. When torqued, the threads will distort or be completely destroyed before the desired torque value is obtained.

So, with Grade 8 bolts, make sure that you have Grade 8 nuts. They have two dash marks on one end of each nut. The Grade 12 nuts will have nine dashes on one end of the corresponding nut. The number nine goes along with the nine radial dashes on the L9 bolts.

At this time, I do not have torque values for G­rade 12 or L9 bolts as they are not in common use, though available if you need them for specific applications.

Like the high strength bolts, specification grade (SPEC.) electrical receptacles are only available from electrical wholesalers. There was a time when they could be obtained in a separate bin at the local hardware store. They will cost three to four times the price of the competition grade (spell it cheap) electrical receptacles that are also CSA-approved.

It was another recent reader phone call about sourcing SPEC. grade receptacles that caused me to mention the source again. They should be used in all high-amperage use outlets, but especially in corrosive environments such as livestock and poultry buildings where items like pressure washers and heat lamps are powered. BF

Agricultural engineer Ralph Winfield farms at Belmont in Elgin County.
 

Current Issue

May 2025

Better Farming Magazine

Farms.com Breaking News

New board members for Ontario Pork

Friday, April 25, 2025

Ontario Pork, an association representing the 1,898 pork farms that market 5.9 million hogs in the province, has announced its new board lineup for 2025. As a Guelph, Ontario-headquartered organization, Ontario Pork is engaged in the areas of research, government representation,... Read this article online

Sheep farmers win Ontario’s Outstanding Young Farmers

Thursday, April 24, 2025

Sheep farmers and wool producers from Wallenstein, Ont. are Ontario’s Outstanding Young Farmers for 2025. “It’s great to be recognized by your peers in the industry with an award like that,” Ryan Schill told Farms.com. “When we started the sheep farm, there were people questioning us... Read this article online

Ontario ag connections in the NHL playoffs

Tuesday, April 22, 2025

The 2025 NHL playoffs are underway, and some of hockey’s biggest names got their start on an Ontario farm or have invested in agriculture since becoming professional athletes. Farms.com went through each of the 16 playoff team rosters to uncover which players have a connection to... Read this article online

New Alcohol Trade Freedom in Ontario

Thursday, April 17, 2025

The Canadian Federation of Independent Business (CFIB) has welcomed Ontario’s bold step in eliminating trade barriers and allowing direct alcohol sales to consumers. This new legislation aims to ease internal trade across provinces and support small businesses. One of the key changes... Read this article online

BF logo

It's farming. And it's better.

 

a Farms.com Company

Subscriptions

Subscriber inquiries, change of address, or USA and international orders, please email: subscriptions@betterfarming.com or call 888-248-4893 x 281.


Article Ideas & Media Releases

Have a story idea or media release? If you want coverage of an ag issue, trend, or company news, please email us.

Follow us on Social Media

 

Sign up to a Farms.com Newsletter

 

DisclaimerPrivacy Policy2025 ©AgMedia Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
Back To Top