Frequently Asked Questions

Grade 5 bolts have a tensile strength of 120,000 PSI and are sufficient for most automotive and construction applications. Grade 8 bolts have 150,000 PSI tensile strength—25% stronger—and are required for high-stress applications like suspension components, heavy equipment, and structural connections. Grade 8 bolts are marked with 6 radial lines on the head, while Grade 5 has 3 lines.

Use Grade 8 when the application specifies it, when loads are high or cyclic, when failure would be catastrophic, or when replacing existing Grade 8 bolts. For general construction, deck building, and light-duty applications, Grade 5 is typically adequate and more cost-effective.

The radial lines on hex bolt heads indicate grade: no lines = Grade 2 (low carbon steel), 3 lines = Grade 5 (medium carbon, quenched and tempered), 6 lines = Grade 8 (alloy steel, quenched and tempered). Metric bolts use numbers instead: 8.8 is similar to Grade 5, and 10.9 is similar to Grade 8.

No. Always match nut grade to bolt grade or higher. A Grade 5 nut will fail before a Grade 8 bolt reaches its rated capacity, causing the connection to fail at the nut threads. Always use Grade 8 nuts with Grade 8 bolts.

For outdoor use in Georgia's humid climate, we recommend hot-dip galvanized (HDG) for most applications—it provides 50+ years of protection in rural environments. For coastal areas within 20 miles of saltwater, use 316 stainless steel. Zinc plating is only suitable for indoor use or temporary outdoor applications.

Zinc plating is a thin electroplated coating (0.0002" thick) suitable for indoor use. Hot-dip galvanizing is much thicker (0.003-0.006") and provides decades of outdoor protection. Galvanized fasteners cost more but last far longer outdoors. Zinc-plated fasteners will rust within months in outdoor exposure.

Use stainless steel for: marine/coastal environments, food processing equipment, medical applications, outdoor furniture, and anywhere appearance matters. 18-8 (304) stainless works for most applications. Use 316 stainless for saltwater exposure, swimming pools, or chemical environments.

This is called galling—stainless steel's oxide layer can break down under friction, causing the threads to cold-weld together. Prevent galling by: using anti-seize lubricant, tightening slowly, using different stainless grades for bolt and nut (e.g., 304 bolt with 316 nut), or using waxed stainless fasteners.

UNC (Unified National Coarse) has fewer threads per inch and is the standard for most applications—easier to assemble and more tolerant of damage. UNF (Unified National Fine) has more threads per inch, providing finer adjustment, slightly higher strength, and better vibration resistance. UNF is common in automotive and precision applications.

For SAE bolts, measure the major diameter (across the threads) and count threads per inch. A 1/2-13 bolt is 1/2" diameter with 13 threads per inch. For metric, measure diameter and thread pitch in mm—an M10x1.5 bolt is 10mm diameter with 1.5mm between threads.

No. SAE and metric threads are not interchangeable even if the diameter seems close. For example, a 1/2" bolt (12.7mm) might seem to fit an M12 nut, but the thread pitch is different and the connection will fail. Always match the thread system.

Measure total material thickness, add washer thickness if used, then add 1.5x the bolt diameter for thread engagement in steel (2x for aluminum or softer materials). Round up to the next standard length. For through-bolting with a nut, ensure 1-3 threads extend past the nut.

Not always, but washers are recommended for: distributing load on soft materials, protecting painted or finished surfaces, spanning oversized holes, and preventing bolt heads from pulling through. For structural steel with properly sized holes, washers are often optional.

Flat washers (SAE or USS) have a standard outside diameter and distribute load. Fender washers have a much larger OD relative to the hole—they span oversized or slotted holes and distribute load over a wider area on thin or soft materials.

Lock washers help prevent loosening from vibration. Split lock washers work for light vibration. For heavy vibration, consider Nordlock wedge-locking washers or thread-locking compound (Loctite). Note: lock washers are not a substitute for proper torque.

Generally, place the washer under whichever part rotates during tightening—usually the nut. For critical connections, use washers under both. Always ensure the washer material matches the fastener material to prevent galvanic corrosion.

We're open Monday through Friday 7:00 AM to 5:00 PM, and Saturday 8:00 AM to 12:00 PM. We're closed on Sundays and major holidays.

Yes! Most in-stock items are available for same-day pickup. Use our website to check availability, then reserve online or call ahead. We'll have your order ready when you arrive.

Absolutely! Bring the fastener to our counter and we'll measure and identify it. You can also text a photo to 229-555-1234 and we'll help identify it before you come in.

Yes, we offer contractor accounts with volume pricing, net-30 terms for qualified businesses, and priority service. Contact us or visit the store to set up an account.

Our Albany, GA location serves all of Southwest Georgia including Americus, Cordele, Tifton, Dawson, Moultrie, Sylvester, Camilla, Bainbridge, and Thomasville. We're located at 123 Industrial Blvd, just off US-19.