The Bolt Guide

Square Head Bolts Grade 2	Flat Slotted Cap Screw	Hex Cap Screw Grade 2
Also known as a Battery Bolt. The Square head offers greater bearing surface for wrenching than standard hex head bolts.	Flat Cap Screws are most often used for assembling close tolerance machinery where head clearance is critical.	Grade 2 Steel used in non-critical applications where not subject to extreme temperatures or excessive stress.
– Zinc	– Zinc	– Zinc – 18-8 Stainless Steel – 316 Stainless Steel – Black Oxide

Hex Cap Screw SAE J429 Grade 5	Hex Cap Screw SAE J429-Grade 8	Studs B7 Steel
Grade 5 used when greater tensile strength needed. Yield-to-tensile ratio is the lowest of all heat treated steels.	Greater tensile strength than Grade 2 or Grade 5. For use in high stress applications.	Grade 2 Steel used in non-critical applications where not subject to extreme temperatures or excessive stress.
– Zinc	– Yellow Zinc	– Plain Steel

Carriage Bolts Square Neck Mild Steel	Carriage Bolts, Square Neck Grade 5	Carriage Bolts, Square Neck Grade 8
Mild Steel used for non-critical applications where cost is a consideration or it is preferred that the fastener shear/deform before the fastened objects. Square Neck keeps the bolt from turning as the nut is tightened.	Also known as “Shaker Screen Bolts”. Grade 5 Steel used when greater tensile strength is needed. The Square Neck keeps the bolt from turning as the nut is tightened.	Grade 8 Steel used for greater tensile strength than Grade 2 or Mild/A307 Steel. Square Neck keeps the bolt from turning as the nut is tightened
– Zinc – Stainless Steel – Galvanized Steel – Black Oxide	– Zinc	– Yellow Zinc

Carriage Bolts Flat Head	Carriage Bolts Ribbed Neck	Track Bolts Ribbed Neck
Square Neck keeps the bolt from turning as the nut is tightened. Flat Head allows a lower profile	Ribbed Neck used in softer materials to keep the bolt from turning when the nut is being tightened.	Designed specifically for use in the installation of garage doors. Ribbed Neck used in softer materials to keep the bolt from turning when the nut is being tightened.
– Zinc – Plain Steel	– Zinc	– Zinc

Step Bolts	Elevator Bolts	Turned, Open End Eye Bolts
For use in softer materials as the larger diameter head will not pull through. Also preferred for its lower profile.	Commonly used in conveyor/elevator systems. Large head also preferred where low profile required.	To use as a temporary, light duty fastening system. Also known as Bent Bolts or Turned Eye Bolts.
– Zinc	– Zinc	– Zinc

Plow Bolts # 3 Head Grade 5	Plow Bolts #3 Head Grade 8	Serrated Hex Flange Screws Grade 5 & Case Hardened
Grade 5 Steel for medium wear. Countersunk flat head with square necks allow better resistance to the wear from heavy duty applications.	Grade 8 Steel for heavy duty wear. Countersunk flat head with square necks allow better resistance to the wear from their heavy duty applications.	Locking Serrations keep a tight grip when loosening forces are present. Flanged Head provides greater bearing surfuce and eliminates need for a washer.
– Zinc	– Plain Steel	– Carbon Steel, Zinc – Grade 5 Steel, Zinc – Stainless Steel – Black Oxide

Flange (Frame) Bolts SAE Grade 8	Structural Bolts ASTM-A325	Hanger Bolts
Generally used for automotive applications. Flanged head provides greater bearing surface and eliminates the need for a washer.	For use in heavy duty construction applications. 120/105 ksi minimum tensile strength as per ASTM international standards.	Part wood screw, part machine screw. Also known as Table Leg Bolts as they are often used in furniture manufacturing.
– Steel Black Phosphate	– Plain Steel – Galvanized Steel	– Full Thread, Zinc – Partial Thread, Zinc – Metric – Stainless Steel


Tap Bolts (Full Thread) Grade 2	Tap Bolts (Full Thread) Grade 5	Tap Bolts (Full Thread) Grade 8
A307 steel for non-critical applications. Generally used in pre-tapped holes where application requires a fully threaded bolt.	Grade 5 for higher tensile strength. Generally used in pre-tapped holes where application requires a fully threaded bolt. Often used in light automotive applications.	Part wood screw, part machine screw. Also known as Table Leg Bolts as they are often used in furniture manufacturing.
Zinc	– Zinc	– Yellow Zinc

Hex Cap Screw Partially Threaded Metric DIN 931	Hex Cap Screw Full Threaded Metric DIN 933	Flange Bolts Metric DIN 6921
Partially threaded. DIN Metric Standard. DIN Grade 10.9 (similar to Grade 8) has a greater tensile strength than Grade 8.8 (similar to SAE Grade 5).	Fully threaded. DIN Metric Standard. DIN Grade 10.9 (similar to Grade 8) has a greater tensile strength than Grade 8.8 (similar to SAE Grade 5).	DIN Metric Standard. Flanged head style provides greater bearing surface and eliminates need for washer.
– Class 8.8, Zinc – Class 10.9, Plain Steel	– Class 8.8, Zinc – Class 10.9, Plain Steel	– Grade 8.8, Zinc – Class 8.8, Plain Steel – Class 10.9, Black Phosphate – Class 10.9, Plain Steel

10 Responses to The Bolt Guide

Leave a Reply Cancel reply

Categories

Recent Posts

Recent Comments