Where 2 buy pad bolts???

Go to a track shop and order a Hardware Kit, still not cheap but your talking 60 +pounds of steel

According to my parts book the 4G used regular hex head cap screw #S-1584 which is a 1/2 in. x 20 tpi x 1-3/4 in. length.
The nuts are a #1B4432 high head fine thread.
The washers a #3B4508

This is all common hardware, available in grade 8 (150,000 psi).
Available from outfits like McMaster or MSC.

Apparently they didn't use the fancy head version and 160,000 psi strength they use now.

O.m., sir, xactly what i needed. U r one of many blessings on this site. Nik, 1921 nichols & shepard 25-85 single, cat & d-44oo stationary.

When I did my D8 14A, Our local Cat shop "NC Machinery" sold me the correct pad bolts for about half of what anyone else could do. Unless your RD 4 pad polts are no longer stocked by your local Cat Dealer, I wouldn't shop for pad bolts anywhere else.

Hard to beat "CAT" bolts at any price.
Frank👍

The Cat bolts will probably have the slightly higher heads and hopefully known quality control. Can't say that I use them except is some critical applications. If your concerned you might try moving to a commercial grade 9 (180,000 psi) which also has the taller head.

Nik,

Are you looking for a pad also?
"Am short one pad, would buy good one. She will not be used daily."
What width and length?

As far as the bolts, I was under the impression that not only do they have a taller head but are shouldered where they go through the pad and the rail?

Jeff

NIK O. I would buy a track bolt only, from Caterpillar if possible. I once saw someone put grade 8 bolts in instead and the bolt heads started to seperate from the bolt shaft, I could see the top of the head caving in. At that point I realized that Caterpillar made track bolts with the very tall and rounded bolt head for a GOOD REASON. This happened on the master link of a D7G track but after seeing the results I still will not cut corners on any track bolts. W. SMITH