Bolts Manufacturer & Supplier

Qi Sheng supplies a full range of industrial bolts for OEM and wholesale buyers. Our bolt categories cover common fastening needs across construction, manufacturing, marine, and general engineering—such as hex bolts, hexagon socket screws, carriage bolts, flange bolts, U-bolts, and T-bolts.
We support sourcing by specification: thread type (metric/imperial), diameter and length, strength grade, material options (e.g., carbon steel, stainless steel), and surface finishes for corrosion protection. If you have drawings or a BOM, our team can help confirm the best matching bolt type and offer packaging options for bulk supply.
For faster quoting, please share: bolt type, size, quantity, material/grade, finish, and any required standard. Request a quote from Qi Sheng to get lead time and price.

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Steel hex bolts and nuts for mechanical and hardware applications.

ASTM A193 B7 Hex Bolt

ASTM A193 Grade B7 hex bolts are chromium-molybdenum alloy-steel fasteners commonly specified for high-temperature or high-pressure service. Product dimensions, thread form, coating, testing and documentation are confirmed for the specified order and application.

Mechanical Properties: Grade B7 requirements are reviewed against the specified product form, dimensions and applicable documentation.
Application Review: Service temperature, pressure and operating conditions should be confirmed against the applicable specification and project requirements.
Surface Protection: Coating options are reviewed for the requested size and service conditions.
Thread Configuration: Full- and partial-thread configurations can be quoted according to the requested dimensions and mating components.
Mating Components: ASTM A194 Grade 2H heavy hex nuts are commonly specified with ASTM A193 Grade B7 bolting; confirm the required nut grade, finish and dimensions for the assembly.

ASTM A193 B8M Hex Bolt

Engineered for extreme environments, the ASTM A193 B8M Hex Bolt by Qi Sheng delivers exceptional durability and reliability for critical B2B industrial applications. Manufactured from premium 316 stainless steel, it is the ultimate fastening solution for high-pressure, high-temperature, and highly corrosive settings.

1. Extreme Temperature Tolerance: Operates flawlessly from -200℃ to 650℃ without deformation.
2. Superior Corrosion Resistance: Premium 316 stainless steel resists acids, alkalis, salt spray, and chlorides.
3. Heavy-Duty Load Bearing: High tensile and yield strength to withstand intense pressure and severe vibration.
4. Standardized Efficiency: Hexagonal head profile ensures seamless fitment with standard wrenches for rapid installation and maintenance.
5. Primary Industries: Oil & Gas, Petrochemical, Power Generation, and Marine infrastructure.

ASTM A320 L7 Hex Bolt

ASTM A320 Grade L7 hex bolts are alloy-steel bolting components for specified low-temperature service. Product dimensions, thread configuration, surface treatment, impact-testing requirements and documentation are reviewed against the applicable specification and order requirements.

Low-Temperature Bolting: Intended for applications where ASTM A320 Grade L7 is specified.
Testing Requirements: Impact-test temperature, test values and documentation are confirmed against the applicable ASTM edition and purchase requirements.
Surface Treatment: Plain, zinc-plated, hot-dip galvanized and PTFE-coated options can be reviewed for the requested size and application.
Thread Configuration: Full- and partial-thread configurations can be quoted according to the requested dimensions.
Mating Components: Nut grade, finish and impact-testing requirements should be confirmed for the complete bolting assembly.

ASTM F3125 Grade A325/A490 Heavy Hex Bolts

1. Medium carbon steel & Alloy steel
2. Highly corrosion-resistant surface treatment
3. Classified as high-strength bolts, manufactured in compliance with ASTM A325 and ASTM A490 standards
4. Designed for use with nuts

T bolt for battery terminal replacement and secure electrical connections.

Battery Terminal Replacement T Bolt

Complies with automotive and industrial standards (e.g., SAE J1171, DIN 787), specialized for battery terminal replacement and connection
Features a T-shaped shankand matching head design (e.g., hex head, square head) to fit battery terminal slots
Common materials include copper-plated steel, pure copper, or corrosion-resistant alloy
Surface treatment options include tin plating, silver plating, or nickel plating to enhance conductivity and anti-corrosion

Carriage Bolt/Mushroom Head Square Neck Bolt

Complies with international standards such as ISO 8677, ASTM A307, and DIN 603
Common materials include carbon steel (e.g., Q235, 45#), stainless steel (e.g., 304, 316), and alloy steel
Classified as special-shaped fasteners, featuring a mushroom-shaped round headand a square neck under the head
Strength grades typically range from 4.8 to 8.8

High-strength bolt with captive washer for secure fastening applications.

Combined Bolt/Socket Head Cap Bolt with Captive Washer

A specialized combined fastener integrating a socket head cap boltwith a captive washer (washer fixed to the bolt shank, non-detachable)
Complies with international standards such as ISO 4762 (bolt) and DIN 125 (washer), ensuring dimensional accuracy and interchangeability
Common materials include carbon steel (e.g., 45#), stainless steel (e.g., 304, 316), and alloy steel
With high-strength variants undergoing heat treatment

DIN251 Hexagon Socket Head with Serrated Flange Screws

1.Complies with DIN 251, ANSI B18.2.1M; serrated flange hex socket fasteners.

2.Material: Carbon steel (45#), stainless steel (304/316), alloy steel (42CrMo); strength grades 4.8–12.9.

3.Structure: Hex socket head + serrated flange (integrated) + full/half thread.

4.Surface treatments: Zinc plating, black oxide, passivation

5.Size M4–M16, length 6–50mm

Hexagon flange bolts without serrated, made for mechanical fastening applications.

DIN6921 Hexagon Flange Bolts Without Serrated

1.Complies with ISO 4162, DIN 6921, ANSI B18.2.1; non-serrated flange hex bolts.

2.Material: Carbon steel (45#), stainless steel (304/316), alloy steel (42CrMo); strength grades 4.8–12.9.

3.Structure: Hex head + smooth integrated flange (no serrations) + full/half thread.

4.Surface treatments: Zinc plating, black oxide, hot-dip galvanizing

5.Size M6–M64, length 16–150mm.

Hex bolt with partial threading for mechanical fastening.

DIN931 Hex Bolt Half Thread

1.Complies with DIN 931, ISO 898-1, ASTM A325, categorized as half-thread hexagonal bolts

2.Material: Carbon steel (45#), alloy steel (42CrMo) or stainless steel (304/316); strength grades 4.8–12.9

3.Structure: One-piece hex head + half-thread shank (threaded section at bolt end, smooth shank in middle)

4.Surface treatments: Zinc plating, black oxide, hot-dip galvanizing; size range M3–M364, length 20mm–150mm

DIN933 Hex Bolt

1.Complies with DIN 933/931, ISO 898-1, ASTM A325; general-purpose hexagonal bolts.

2.Material: Carbon steel (45#), alloy steel (42CrMo), stainless steel (304/316); strength grades 4.8–12.9.

3.Structure: One-piece hex head + threaded shank (full/half thread optional).

4.Surface treatments: Zinc plating, black oxide, hot-dip galvanizing; size M6–M30, length 20mm–150mm.

Hammer Bolt

Complies with international standards such as DIN 18800, ISO 8673, and ASTM A325 (for structural variants)
Categorized as hammer-driven fasteners
Features a cylindrical head with a flat or slightly domed topand a smooth or partially threaded shank, designed for hammer-in installation
Common materials include carbon steel (e.g., Q235, 45#), stainless steel (e.g., 304, 316), and alloy steel
Surface treatments include zinc plating, blackening, or hot-dip galvanizing for corrosion resistance