Full Thread Carriage Bolts (DIN 603)

Question: What is a carriage bolt?

Answer: A carriage bolt is a fastener characterized by a smooth, domed head and a square section directly beneath it. The square section is designed to lock the bolt in place and prevent it from turning when you tighten the nut on the other end. Fullerkreg Metric Full Thread Carriage Bolts feature a fully threaded shaft and are manufactured according to DIN 603.

Question: Why do they call it a carriage bolt?

Answer: The name dates back to the early 1800s, originating from their initial use in the construction of horse-drawn carriages and coaches, where they were used to fasten metal to wood.

Question: What is the ISO equivalent of DIN 603?

Answer: The ISO equivalent for DIN 603 mushroom head square neck carriage bolts is ISO 8678;CSN 021319; PN 82406; UNI 5731;

Question: What is the difference between a carriage bolt and a coach bolt?

Answer: There is no difference; the terms "carriage bolt" and "coach bolt" are interchangeable and refer to the exact same type of fastener. Both feature a domed head with a square section underneath. 

Question: When should I use carriage bolts?

Answer: Carriage bolts are ideal for applications where a smooth, snag-free surface is desired and where the square neck can lock into the material to prevent spinning. Common uses include:

Fastening wood to wood or wood to metal.

Outdoor structures like decks, fences, and garden projects.

Situations where tightening is only possible from one side, as the bolt head is designed to be self-locking.

Question: What are the available materials and strength grades for this series of carriage bolts?

Answer: Fullerkreg Metric Full Thread Carriage Bolts offer the following standard options, with other materials potentially available for bespoke orders: Materials:  A2 (304) Stainless Steel, A4 (316) Stainless Steel ,Strength Grades : Class 4.8, Class 6.8, Class 8.8 (for metric bolts).

Question: Is Fullerkreg a manufacturer of carriage bolts? Where are they produced?

Answer: Yes, Fullerkreg is a manufacturer of carriage bolts, offering high-precision, bespoke manufacture through state-of-the-art facilities that specialize in both small-batch prototyping and large-scale production. The specific geographic location of production is not detailed in the provided materials.

Active Stock List (All items are currently in stock)：

PIC	PRODUCT	SIZE	GRADE	FINISH	THREAD
	DIN 603 Carriage Bolt A2 Stainless	M5 to M16	A2 Grade 70	-	Coarse
	DIN 603 Carriage Bolt A4 Stainless	M5 to M16	A4 Grade 70	-	Coarse
	DIN 603 Carriage Bolt 4.6 Zinc	M6 to M24	4.6 Grade	Zinc CR3	Coarse
	DIN 603 Carriage Bolt 8.8 Zinc	M6 to M20	8.8 Grade	Zinc CR3	Coarse
	DIN 603 Carriage Bolt Brass	M5 to M8	-	Brass	Coarse