Shops, Barns, Varmints, and Trucks

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Another question

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=180743
Printed Date: 06 Sep 2025 at 9:37am
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Topic: Another question

Posted By: JTOOL
Subject: Another question
Date Posted: 24 May 2021 at 7:38pm

Hunt4Allis' last post in the Farm Equipment section mentioned square head bolts and got me to wondering when did manufacturers go from square head to majority hex head. I have a Servis brand back blade that has several square head bolts on it. Just curious. Thanks.

Replies:

Posted By: steve(ill)
Date Posted: 24 May 2021 at 9:10pm

Hex head bolts have been around ( a few) for 400 years.. Square head bolts and nuts have been around even longer. The nice thing about square headed bolts and nuts is you could use a beat up old wrench to hold or tighten the nut. A 5/8 inch wrench would tighten a 9/16, possibly even a 1/2 inch head.. Thats why the wide spread use for many years even into the 1960- 70s... normally not "high torque" applications.. just basic fasteners.

HEX bolts needed special wrenches and sockets. hard to tighten a Hex head with an open end wrench.. When wrenches and sockets got better and more available, it was easy for the HEX to take over as the Majority.

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Like them all, but love the "B"s.

Posted By: ac hunter
Date Posted: 25 May 2021 at 4:40pm

When I re-do implements with square head bolts / nuts I like to replace them when needed with square stuff. I have found new in the past a couple of times on ebay and decent used in a big box of bolts Dad saved. Keeps the original look. Think I saw them at McMaster-Carr once too.