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MToomey, You will find ASTM A320 refers to ASTM A962. ASTM A962 section 13.3.1 refers to ASME B18.2.1 (for inch bolts) and states the heavy hex series should be used. Suggest you obtain a copy of ASTM A962 if you do not already have it. It contains a lot of requirements applicable to A320 (and...

Suggest reading ASTM F3125, which covers the "A490" structural bolts, especially Annex A1 as this lists acceptable coatings for this grade of bolt. Both mechanical zinc and hot-dip galvanized coatings are not permitted on A490 bolts. ASTM A354 is not as restrictive on coatings. Note 1 - ASTM...

Thank you all for the information!!!

Thank you drawoh!! I checked the Qcad and only a trial for 15 minutes is free. They do have some fasteners in their library, but not many and most are metric. As for use, we would basically just be printing (and scanning)them and providing them to a customer and/or supplier when needed. Nothing...

Thank you Ted!! I tried Unbrako, but found I need Autocad in order to run their download and I do not have any cad programs.

Does anyone know of a low cost, easy to use drawing software for fasteners? Looking to make simple drawings for screws, nuts, bolts, studs, etc. I am hoping there is software out there that already has the fasteners with the various head styles, etc that is simple to use.

Note in the fastener distributor lingo, machine bolts typically refer to ASTM A307 Grade A Hex Bolts. These bolts have a min tensile of 60,000 psi, about half the strength as a grade 5 cap screw.

Look at ASTM A563M. Table X1.1 contains a nut/bolt suitability guide.

Splitrings, ASME B18.2.1 is a dimensional standard for a variety of hex and square bolts, cap screws, lag screws, etc. It does not contain any specific mechanical properties for the bolts. The grades 1, 2, 5 & 8 bolt material and mechanical properties are covered in specification SAE J429...

The inside of the nut threads should not have any galvanize coating on them. Hot-dip galvanized (HDG) nuts are galvanized before tapping the threads. If there are unused nuts that have a coating on the threads, it may be the nuts were mechanically galvanized. If this is the case, those nuts...

I will assume the nut had been assembled on the bolt in question, but not fully up the bolt threads to the body. This would explain why the lower portion of the threads look shaved and the bolt threads above where the nut assembled look normal. Since you suspect the nut is not tapped oversize...

The bolt threads are made to Class 2A thread fit prior to galvanizing (required by A325). Per ASTM A325 the maximum allowable limit for the 3/4 bolt threads is 0.020 over the maximum Class 2A thread pitch diameter of 0.6832 (thus 0.7032 is max pitch diameter after HDG). The galvanized nuts used...

Thanks all! The bolts are used on a hub that is attached to a motor that turns large diameter wheels for irrigation purposes. It is in an enclosed piece of equipment. The hole in the hub is punched twice to reduce the taper. The user was concerned about possible slippage of the bolts and...

We have a 9/16-18 wheel bolt with a straight knurl under the head. What is the typical interference? The low diameter over the knurls is 0.6305. Approximate contact length in the mating part is 0.065 (steel is 1/8" thick and 0.060 max length under head to start of knurl). Thanks!

I believe an equivalent ASTM B633 callout is Type II, Class Fe/Zn5. Note that ASTM B695 is a mechanical zinc coating, not an electroplate such as B633 and the old QQ-Z-325.

I know there is a requirement for the 24 hour heating of ASTM A194 Grade 2H nuts at a specific temperature and then hardness testing of the sample. This test is essentially a temper audit to assure the minimum tempering temperature was met.

The marking of 3 radial lines indicates a Grade 5 bolt (SAE J429 Grade 5). Based on information I have, the "LM" mark likely belongs to a factory in China by the name of Ningbo Haixin Hardware.

One thing to keep in mind is if you are using a SHCS or other high strength bolt, a hardened flat washer (ASTM F436 as an example) should be considered.

I recommend you talk to a good fastener distributor who can work with a wholesale fastener distributor/importer in the U.S. There are some very reputable fastener importers who understand where to source for a variety of fasteners and similar products and understand the necessary specifications...

ASME B18.24 - 2004 is the document you need. B18.24 - 2004 Part Identifying Number (PIN) Code System Standard for B18 Fastener Products http://catalog.asme.org/Codes/PrintBook/B1824_2004_Part_Identifying.cfm?TAB=Designator&Designator=B18