ASME B18.2.1 SAE Grade 5 Hex Head Bolt Carbon Steel Zinc Plated

ASME B18.2.1 SAE Grade 5 Hex Head Bolt Carbon Steel Zinc Plated is a widely used inch-series heavy-duty fastener designed for medium-load industrial fastening applications. Manufactured from medium carbon steel and processed by quenching and tempering heat treatment, this bolt achieves balanced tensile strength and impact resistance. The zinc plated surface treatment delivers reliable basic rust protection for indoor and mild outdoor environments. You can easily identify the grade by the three radial marking lines on the bolt head, which complies with SAE J429 specification.

Key Features

- Produced strictly in accordance with ASME B18.2.1 and SAE J429 standards, equipped with standard UNC inch thread for matching American standard nuts and tapped holes.

- After professional heat treatment, it reaches Grade 5 mechanical performance with a minimum tensile strength of 120 ksi, stable enough for medium-load connection.

- Multiple surface options are available, including zinc plated, black oxide and hot dip galvanized, to satisfy different anti-corrosion requirements.

- Most sizes adopt semi-threaded structure, which helps to improve clamping force and avoid thread sliding during assembly.

Material & Surface Treatment Table

Typical Application Scenarios

When you need reliable inch-size fasteners for equipment assembly, the ASME B18.2.1 SAE Grade 5 Hex Head Bolt Carbon Steel Zinc Plated is a trusted option. It is commonly installed on agricultural machinery, truck and trailer components, steel frames, construction equipment and general mechanical housings. The standard inch thread ensures perfect fit with matching American standard fastener accessories. It is widely selected for projects that require medium tensile strength without extreme corrosion conditions.

Size Reference Table

Production & Quality Control

Every batch of bolts goes through a complete production flow, including raw material inspection, hot forging, heat treatment, thread rolling and surface finishing. Our QC team conducts random sampling tests on hardness, tensile strength and thread dimension to verify mechanical performance. For the ASME B18.2.1 SAE Grade 5 Hex Head Bolt Carbon Steel Zinc Plated, we record all test data and provide inspection certificates upon request. Each finished bolt will be visually checked to remove products with surface defects or damaged threads before packing.

Why Choose Gangtong Zheli

Gangtong Zheli is a professional manufacturer specialized in both metric and inch standard fasteners. We own complete production equipment and independent testing laboratory, which allows us to control quality from raw steel to finished goods. We accept small trial orders for sample testing and can support large-volume bulk shipments for long-term cooperation. Our sales and technical team can offer professional selection suggestions to help you pick the right size and surface finish for your project. We always keep sufficient stock of popular sizes to shorten your delivery lead time.

Packaging & Shipment

Large bulk goods are packed in thick woven bags, then put into export corrugated cartons. All outer cartons are sealed with waterproof tape and reinforced with plastic strapping. We adopt neutral carton packaging with fumigation and palletizing for sea shipment. Each pallet will be firmly fixed to prevent shifting during long-distance ocean transportation. For bulk orders, we can arrange customized marking on cartons based on customer’s requirements.

Installation Tips

Proper installation can maximize the service life of the ASME B18.2.1 SAE Grade 5 Hex Head Bolt Carbon Steel Zinc Plated. Please select matched UNC nuts and washers. Avoid over-tightening which may lead to bolt breakage. Pre-drilling is recommended for metal plate assembly. If your working environment has heavy corrosion, hot dip galvanized version is recommended instead of standard zinc plated finish.

FAQ

Q1: What do the three radial lines on the bolt head mean?

A1: It is the official SAE Grade 5 marking defined in SAE J429, to distinguish Grade 5 bolts from higher strength Grade 8 bolts.

Q2: Is the hot dip galvanized version available?

A2: Yes, HDG option is available. Please note hot dip galvanizing coating may cover the original head marking.

Q3: Can I get a material test certificate for my order?

A3: Yes, MTC can be provided as requested before shipment.

Q4: Do you support custom non-standard lengths?

A4: Custom lengths are acceptable, subject to minimum order quantity confirmation.