Need help with bolt size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

FL71C10 · 02-21-2019, 04:43 PM

I am finally installing my steering column and I don't have all of the bolts. I have the brackets, but not the bolts. I am trying to figure out what size the bolts are that hold the bracket that the lower part of the steering column straps to just outside of the passenger compartment, below the master cylinder. I have circled the holes in blue ink on some pictures I had. Can anyone help me here?

Thank you in advance.

**DeadheadNM** · 02-21-2019, 04:55 PM

This might help: http://67-72chevytrucks.com/vboard/s...&postcount=173

**DeadheadNM** · 02-21-2019, 04:56 PM

one more: http://67-72chevytrucks.com/vboard/s...&postcount=171

**71CHEVYSHORTBED402** · 02-21-2019, 10:56 PM

Column cover (engine side): The column cover mounts over a portion of the toe pan seal. The cover mounts to the firewall using:

• One (GR 5) 1/2" hex bolt and lock washer. The bolt thread is 5/16-18 x 1.1/2, of which 1/2" is shaft. This bolt also secures the brake booster bracket. The column cover slides underneath the booster bracket. NOTE: The bolt head is stamped "ROCKFORD".

• One (GR 5) 1/2" recessed hex tapered bolt with a 1" OD integrated washer. The bolt thread is 5/16-18 x 7/8. NOTE: The bolt head is stamped with an anchor. Very cool bolt BTW, it's not a flange head like most recessed bolts

**zicc1835** · 02-22-2019, 10:33 PM

Im going out to see if my bolt heads have all those markings

**71CHEVYSHORTBED402** · 02-23-2019, 12:13 AM

Quote:

Originally Posted by zicc1835

Im going out to see if my bolt heads have all those markings

Ha ha......Be interesting. "Rockford" kind of threw me off, doesn't seem original, but my guess it is. Pulled two other Rockfords off my truck, same bolt only 1/4" longer. They mount the combination valve.

FL71C10 · 02-23-2019, 10:25 AM

Thanks DeadheadNM and 71CHEVYSHORTBED402. That definitely helps!

02-21-2019, 04:43 PM	#1
FL71C10 Registered User Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,506	Need help with bolt size I am finally installing my steering column and I don't have all of the bolts. I have the brackets, but not the bolts. I am trying to figure out what size the bolts are that hold the bracket that the lower part of the steering column straps to just outside of the passenger compartment, below the master cylinder. I have circled the holes in blue ink on some pictures I had. Can anyone help me here? Thank you in advance. Attached Images __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

02-21-2019, 04:55 PM	#2
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,280	Re: Need help with bolt size This might help: http://67-72chevytrucks.com/vboard/s...&postcount=173 __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland

02-21-2019, 04:56 PM	#3
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,280	Re: Need help with bolt size one more: http://67-72chevytrucks.com/vboard/s...&postcount=171 __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland

02-21-2019, 10:56 PM	#4
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,118	Re: Need help with bolt size Column cover (engine side): The column cover mounts over a portion of the toe pan seal. The cover mounts to the firewall using: • One (GR 5) 1/2" hex bolt and lock washer. The bolt thread is 5/16-18 x 1.1/2, of which 1/2" is shaft. This bolt also secures the brake booster bracket. The column cover slides underneath the booster bracket. NOTE: The bolt head is stamped "ROCKFORD". • One (GR 5) 1/2" recessed hex tapered bolt with a 1" OD integrated washer. The bolt thread is 5/16-18 x 7/8. NOTE: The bolt head is stamped with an anchor. Very cool bolt BTW, it's not a flange head like most recessed bolts __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025

02-22-2019, 10:33 PM	#5
zicc1835 Senior Member Join Date: Mar 2011 Location: Hanover NJ Posts: 4,108	Re: Need help with bolt size Im going out to see if my bolt heads have all those markings __________________ Doc & Kim build http://67-72chevytrucks.com/vboard/s...d.php?t=722288 I am from the desert http://67-72chevytrucks.com/vboard/s...d.php?t=650332 basket case build SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=648557

02-23-2019, 10:25 AM	#7
FL71C10 Registered User Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,506	Re: Need help with bolt size Thanks DeadheadNM and 71CHEVYSHORTBED402. That definitely helps! __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.



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