Stainless Steel Carriage Bolt Round Head Square Neck Bolt

Under the Wanluo factory brand, we supply high-quality Stainless Steel Carriage Bolt Round Head Square Neck Bolt, also named round head square neck bolts, compliant with global industrial standards. This specialized fastener features a unique round head and square neck structure, focusing on anti-rotation installation and smooth surface fastening.

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Product Description

Wanluo supplier’s China Stainless Steel Carriage Bolt Round Head Square Neck Bolt effectively avoids bolt rotation during tightening and leaves a flat, burr-free surface after installation, which cannot be replaced by ordinary bolts in decorative and concealed fastening scenarios. We support spot wholesale, non-standard customization and bulk order supply to meet diverse global procurement needs.

Design Innovation & Structural Strength

Different from conventional fasteners, this carriage bolt adopts an integrated round head + square neck one-piece forging structure. The embedded square neck can be tightly clamped in the mounting hole to achieve automatic anti-rotation positioning, eliminating the need for manual bolt fixing during installation and greatly improving construction efficiency. The smooth arc round head provides no sharp edges, preventing scratch injuries and surface abrasion of connected workpieces. Made of high-purity stainless steel, the bolt features compact internal structure, stable mechanical strength and excellent environmental adaptability, maintaining neat appearance and firm fastening for long-term outdoor and decorative engineering use.

Product Parameter

Parameter Item	Detailed Specification
Product Name	Stainless Steel Carriage Bolt, Round Head Square Neck Bolt
Executive Standard	DIN 603, ISO, ANSI, GB Standard, Custom Non-standard Sizes Available
Available Material	In Stock: 304, 316, 316L; Customizable: 904L, 310S, 2205, 2507 Duplex Steel
Size Range	M3-M24 mainstream sizes, customizable bolt length and square neck size
Thread Type	Standard metric coarse thread, fine thread customizable for special assembly
Surface Treatment	Pickling & passivation, ultra-smooth flawless surface, uniform metallic luster
Mechanical Properties	Stable tensile strength, good toughness, anti-twist and anti-loosening performance
Packaging Method	Standard inner bag + export carton, pallet packaging for FCL, OEM private label supported
Supply Service	Spot inventory supply, personalized customization, mixed shipment and one-stop procurement

Stainless Steel Carriage Bolt Round Head Square Neck Bolt

Thread Size d		M5	M6	M8	M10	M12	M16	M20
P	Pitch	0.8	1	1.25	1.5	1.75	2	2.5
b	L≤125	16	18	22	26	30	38	46
	125 < L≤200	22	24	28	32	36	44	52
	L>200	/	/	41	45	49	57	65
d_k	max	13.55	16.55	20.65	24.65	30.65	38.8	46.8
d_k	min	12.45	15.45	19.35	23.35	29.35	37.2	45.2
d_s	max	5	6	8	10	12	16	20
d_s	min	4.52	5.52	7.42	9.42	11.3	15.3	19.16
k₁	max	4.1	4.6	5.6	6.6	8.75	12.9	15.9
k₁	min	2.9	3.4	4.4	5.4	7.25	11.1	14.1
k	max	3.3	3.88	4.88	5.38	6.95	8.95	11.05
k	min	2.7	3.12	4.12	4.62	6.05	8.05	9.95
r₁	≈	10.7	12.6	16	19.2	24.1	29.3	33.9
r₂	max	0.5	0.5	0.5	0.5	1	1	1
r₃	max	0.75	0.9	1.2	1.5	1.8	2.4	3
s	max	5.48	6.48	8.58	10.58	12.7	16.7	20.84
s	min	4.52	5.52	7.42	9.42	11.3	15.3	19.16

Applicable Industry Scenarios

1. The Stainless Steel Carriage Bolt Round Head Square Neck Bolt unique square neck anti-rotation structure locks the position firmly during installation, preventing bolt spinning and shaking, greatly improving assembly efficiency for manual and mechanical installation.

2. Polished smooth round head eliminates sharp corners, ensuring safe and beautiful installation effect, perfectly suitable for furniture manufacturing, guardrail installation and decorative engineering with high appearance requirements.

3. Premium stainless steel material provides excellent rust and corrosion resistance, adapting to outdoor guardrails, landscape facilities, coastal equipment and humid environmental installation scenarios.

4. Precise standardized thread rolling ensures tight nut matching, realizing stable locking without loosening, suitable for long-term fixed connection of wooden structures, metal frames and equipment supports.

5. Multiple in-stock specifications and flexible non-standard customization meet the diverse size requirements of furniture, construction, machinery and municipal engineering fastening projects.

Stainless Steel Carriage Bolt Round Head Square Neck Bolt

FAQ

Q1: What is the unique feature of carriage bolts compared with ordinary bolts?

A1: Stainless Steel Carriage Bolt Round Head Square Neck Bolt adopt round head and square neck design. The square neck can be fixed in the mounting hole to prevent rotation during tightening, requiring no auxiliary fixing tools. The smooth round head also provides safer and more aesthetic installation results, which is irreplaceable for decorative fastening scenarios.

Q2: What scenarios are carriage bolts mostly used in?

A2: They are widely used for fence guardrails, wooden furniture assembly, municipal landscape facilities, metal frame decoration, outdoor equipment fixing and other scenarios requiring beautiful appearance, flat surface and firm anti-loosening fastening.

Q3: Can you customize special-sized square neck carriage bolts?

A3: Yes. We support customized square neck width, bolt rod length and thread specifications, including non-standard small-size and long-size carriage bolts to match special installation holes and equipment gaps.

Q4: Will the round head of the bolt be scratched easily?

A4: All products are treated with fine pickling and passivation, with smooth and wear-resistant surface. The integrated molding process ensures no burrs or cracks, maintaining a neat appearance even after long-term use.

Q5: Are stainless steel carriage bolts suitable for outdoor long-term use?

A5: Definitely. Standard 304/316 stainless steel has reliable weather resistance and anti-rust performance. It can resist wind, rain and salt fog erosion, and is the preferred fastener for outdoor decorative and structural fixing projects.

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