Explore Our Range of Bolt Products
As a trusted bolt manufacturer, Shanghai Hengrui provides reliable bolt supply for industrial projects, wholesale orders and long-term distributor purchasing. With over 15 years of technical expertise in the fastener industry, we help global buyers source metric and inch bolts in different materials, sizes, grades and surface finishes for construction, machinery, automotive, energy, oil and gas, and municipal applications. Backed by ISO9001 quality management, strict inspection and practical specification support, Hengrui delivers bolt products built for strength, durability and consistent performance.
Timber Bolt
Shoulder Bolt
Carriage bolt
Hex Flange Bolt
Plow bolt
TC bolt
U Bolt
T-head Bolt
Threaded Bar
Hex Bolt
Square Head Bolt
Eye Bolt
Bolt Materials and Surface Finishes for Your Application
Bolt materials and surface finishes should be selected according to strength requirements, corrosion environment, service life and project budget. Hengrui helps buyers choose suitable material and finish options.
Bolt Materials
Except for carbon steel, alloy steel and stainless steel, the materials we offer include:
Our Titanium & titanium alloy model include A-40, A-55, A-70, A-110AT, C120AV, C135AMo, C125AVT
Ｈastelly alloy model include C-276, C-4, C-22, C-2000, C-59, B, B-2, B-3, X.
Monel alloy model include 400, 404, 500
Brass material type include copper, brass, leaded brass, tined brass
Inconel alloy model include 600, 601, 617, 625, 686, 690, 706, 718, 725
Surface Finishes
Surface treatment we can offer are:
Plain, Zinc plating, Black Oxide, Hot‑Dip Galvanized, Chrome, Magni 560, Dacromet, Zn-ni, Gemet 500B, brass plated, nickel plated, etc.
Ensuring your components not only perform exceptionally but also withstand the harshest conditions.
Industrial Applications of Our Bolts
Hengrui bolts are used in automotive assembly, machinery, wind energy, tower and pole structures, oil and gas facilities, steel structures, commercial projects and municipal engineering. We help you match bolt specifications with real working conditions and project requirements.
Quality Control & Certifications
We strictly follow the ISO9001 quality management system. Every bolt order is checked through material inspection, production monitoring and final inspection before shipment. According to product requirements, we can provide dimensional checks, thread inspection, hardness testing, tensile testing, salt spray testing and inspection reports.
Flexible Packaging and Delivery for Bulk Orders
Hengrui offers cartons with wooden pallets, wooden cases, pails, small bags and customized export packaging.
Why Choose Us as Your Bolt Manufacturer
Choosing the right bolt manufacturer helps you reduce sourcing risk, avoid specification mistakes and maintain stable supply. Hengrui supports buyers with fastener experience, practical technical communication, inspection documents, export packaging and after-sales traceability.
Delivery Assurance
With our warehouse capacity and dedicated delivery team, we can arrange production and stock preparation in advance to keep orders on schedule and support urgent or repeat orders when possible.
Quality Assurance
We strictly comply with the ISO9001 system. Each production process is managed through self-inspection and routing inspection. Our testing equipment includes tensile machines, hardness testers, salt spray testers and dimensional inspection tools.
Good Price & After sales service
With strong sales, we can help you choose the most economical process according to bolt material, size, to help you save the cost; All of our products put our company mark”HR”, you can always find us based on our mark”HR”
Technical & Sales support
With more than 20 years’ experience of technical staff and more than 10 years’ experience of sales staff, Hengrui can help solve most problems customers may meet in bolt selection
Meet the Team Behind Your Order
Meet the team behind your order at Hengrui Fastener. From quotation and drawing review to production follow-up and shipment.
Sales and Project Support
Our sales team supports have 16 years of sales experience in fastener export support, follow-up from inquiry to shipment. Clear communication helps reduce mistakes and keeps the order moving in the right direction.
Technical & Sales support
With more than 20 years' experience oftechnical staff and more than 10 yearsexperience of sales staff, Hengrui can helpyou solve most problems you meet.
Feedback from Global Bolt Buyers
Many customers choose us for repeat bolt orders because of stable quality, clear communication and reliable delivery support. Buyers from machinery, construction, energy, tower and pole, oil and gas, and distributor markets value our ability to confirm specifications, prepare inspection documents and support bulk purchasing with consistent service.
Common Questions About Bulk Bolt Orders
Below are some common questions customers ask when sourcing bolt from China.
What information should I send for a bolt quotation?
please send us the bolt type, size, material, grade, quantity. If you have drawings, samples or photos, you can also send them to our team for checking before quotation.
Can you supply bolts according to DIN, ANSI or ISO standards?
Yes. We can supply bolts according to common international standards, including DIN, ANSI, ASME, ISO, GB and JIS requirements.
Do you offer free bolt samples?
Yes. For available bolts, samples can be offered free of charge, and customers only need to pay the freight cost.
What is your lead time for bulk bolt orders?
20 -45 days in generally, the precise delivery time based on the detailed order
Can you provide inspection reports before shipment?
Yes. Material test reports and inspection reports can be provided before shipment. Third-party inspection can also be arranged if required.
What is your production capacity for bolts?
We has 20 cold heading machines and 30 thread rolling machines, with an annual production capacity of up to 12,000 tons.
Do you support custom packaging or private labeling?
Yes. Custom bolt packaging, labels, and carton marks are available. Including: bulk in cartons+wooden pallet, bulk in wooden case, bulk in steel pails+pallets or wooden case, plastic films+steel supoort frame.
What is your payment term?
By T/T, 30% down payment, and balance before shipment
Your Trusted Supplier of Bolt Needs
Shanghai Hengrui Industrial Co., Ltd is a bolt manufacturer with 15 years experience, is specializing in the manufacturing and exporting of bolt and custom non-standard bolt, with many different materials, like carbon steel, stainless steel, brass, aluminum, titanium, special alloy steel, etc.
Your Buying Guide to Procuring Bolts
When you buy bolts for industrial use, you need to consider more than size and price. This guide helps you understand bolt structure, head types, thread options, strength grades, surface treatments and quotation details, so you can choose suitable bolts and communicate your requirements more clearly with the manufacturer.
What is bolt?
Bolt is a kind of fastener, which include a head and a cylindrical body with threads, are use to connect two or more objects through inserted in pre-made holes, then fasten with a nut in the other end.
Common Bolt Head Types
Hex head, Heavy hex head, Round head, Hex flange head, T head, Square head
Bolt Body Type
The diameter of a bolt’s body plays a crucial role in its strength and application.
Full size body
The body diameter is very close to the major diameter of threads. Full-size body have better mechanical properties than undersize body, because they have more material in the shank.
Undersize body
The diameter of undersize body is smaller than the major diameter of threads
Full Thread vs Partial Thread Bolts
The thread length of a bolt affects its grip strength and the types of materials it can effectively join.
The thread length of bolt have two kinds: Full thread and Partial thread
Full Thread
These bolts have threads that extend from the end to the head, providing maximum grip strength. They can be used in a variety of applications where the bolt is not subjected to significant shear forces. Full Thread Bolts for Maximum Grip
Partial Thread
Having a non-threaded shoulder between the head and the thread part, partial thread bolts are stronger under shear forces. They are ideal for aligning structures due to the smooth shoulder. Partial Thread Bolts for Enhanced Shear Strength
Bolt Thread type: M/UNC/UNF
| DIN ( M ) | |||
|---|---|---|---|
| Diameter (mm) | Pitch (mm) | Diameter (mm) | Pitch (mm) |
| M6 | 1 | M24 | 3 |
| M8 | 1.25 | 2 | |
| 1 | M27 | 3 | |
| M10 | 1.5 | 2 | |
| 1.25 | M30 | 3.5 | |
| 1 | 2 | ||
| M12 | 1.75 | M33 | 3.5 |
| 1.25 | 2 | ||
| 1.5 | M36 | 4 | |
| M14 | 2 | 3 | |
| 1.5 | M42 | 4.5 | |
| M16 | 2 | 3 | |
| 1.5 | M45 | 4.5 | |
| M18 | 2.5 | M48 | 5 |
| 2 | 3 | ||
| 1.5 | M52 | 5 | |
| M20 | 2.5 | M56 | 5.5 |
| 2 | 4 | ||
| 1.5 | |||
| M22 | 2.5 | ||
| 2 | |||
| 1.5 | |||
| ANSI, ASME, IFI ( UNC/UNF ) | |||
|---|---|---|---|
| Diameter (Inch) | Pitch (Threads Per Inch) | Diameter (Inch) | Pitch (Threads Per Inch) |
| 1/4- | 20UNC | 7/8- | 9UNC |
| 28UNF | 14UNF | ||
| 5/16- | 18UNC | 1" | 8UNC |
| 24UNF | 12UNF | ||
| 3/8- | 16UNC | 1-1/8- | 7UNC |
| 24UNF | 8UNF | ||
| 7/16- | 14UNC | 1-1/4- | 7UNC |
| 20UNF | 8UNF | ||
| 1/2- | 13UNC | 1-3/8- | 6UNC |
| 20UNF | 8UNF | ||
| 9/16- | 12UNC / 18UNF | 1-1/2- | 6UNC |
| 5/8- | 11UNC | 8UNF | |
| 18UNF | 1-3/4- | 5UNC | |
| 3/4- | 10UNC | 8UNF | |
| 16UNF | |||
Bolt Dimension Standard
| Bolt Types | Bolt Grade | Recommended Nut Grade | Recommended Washer Grade |
|---|---|---|---|
| Hex bolt, hex cap screw, carriage bolt, hex flange bolt, square bolt, plow bolt, U bolts, splice bolt, T bolt, socket cap screw, timber bolt, etc. | SAE J429 Gr.2 | SAE J995 Gr.2 | N/A |
| SAE J429 Gr.5 | SAE J995 Gr.5 | N/A | |
| SAE J429 Gr.8 | SAE J995 Gr.8 | N/A | |
| ASTM A307 Gr.A | ASTM A563 Gr.A | N/A | |
| ASTM A307 Gr.B | ASTM A563 Gr.A | N/A | |
| Thread rods and headed bolt | ASTM A193 B7 | ASTM A194 Gr.2H | F436 |
| ASTM A193 B8 Class 1 | ASTM A194 Gr.8 | SS304 | |
| ASTM A193 B8M Class 1 | ASTM A194 Gr.8M | SS316 | |
| ASTM A193 B8 Class 2 | ASTM A194 Gr.8 | SS304 | |
| ASTM A193 B8M Class 2 | ASTM A194 Gr.8M | SS316 | |
| Steel transmission tower bolt | ASTM A394 Type 0 | ASTM A563 Gr.A | F436 |
| ASTM A394 Type 1 | ASTM A563 Gr.DH | F436 | |
| ASTM A394 Type 3 | ASTM A563 Gr.DH3 | F436 | |
| Anchor bolt | ASTM F1554 Grade 36 | ASTM A563 Gr.A | F436 |
| ASTM F1554 Grade 55 | ASTM A563 Gr.A | F436 | |
| ASTM F1554 Grade 105 | ASTM A563 Gr.DH | F436 | |
| Heavy hex structural bolts | ASTM A325 | ASTM A563 Gr.DH | F436 |
| ASTM A490 | ASTM A563 Gr.DH | F436 |
Bolt Grade Specification
A307 & A394 Grade
| Standard for Bolt | Grade | Tensile Strength | Yield Strength | Elongation | Length | Hardness | |
|---|---|---|---|---|---|---|---|
| ksi | ksi | % | in. | Brinell | Rockwell B | ||
| A307 | Gr.A | 60 min | -- | 18 | < 3*D | 121-241HRB | 69-100HRB |
| ≥ 3*D | 241max | 100max | |||||
| Gr.B | 60-100 | -- | 18 | < 3*D | 121-212 | 69-95 | |
| ≥ 3*D | 212max | 95max | |||||
| A394 | Type 0 | 74 | 80-100 | ||||
| Type 1 | 120 | 25-34 | |||||
A325 Grade
| Standard for Bolt | Grade | Bolt Size | Tensile Strength | Yield Strength | Elongation | Bolt Length | Hardness | |
|---|---|---|---|---|---|---|---|---|
| in. | ksi | ksi | % | in. | Brinell | Rockwell C | ||
| A325 | Type 1 | 1/2-1 | 120 min | 92 min | 14 min | < 2*D | 253-319 | 25-34HRC |
| ≥ 2*D | 319max | 34max | ||||||
| 1-1/8~1-1/2 | 105 min | 81 min | 14 min | < 3*D | 223-286 | 19-30HRC | ||
| ≥ 3*D | 286max | 30max | ||||||
SAE J429 Grade
| Standard for Bolt | Grade | Bolt Size | Tensile Strength | Yield Strength | Elongation | Hardness | |
|---|---|---|---|---|---|---|---|
| in. | ksi | ksi | % | Surface 30N max | Core Rockwell | ||
| SAE J429 | Gr.2 | 1/4 to 3/4 | 74 | 57 | 18 | / | B80-100 |
| over 3/4 to 1-1/2 | 60 | 36 | 18 | / | B70-100 | ||
| Gr.5 | 1/4 to 1 | 120 | 92 | 14 | 54 | C25-34 | |
| over 1 to 1-1/2 | 105 | 81 | 14 | 50 | C19-30 | ||
| Gr.8 | 1/4 to 1-1/2 | 150 | 130 | 12 | 58.6 | C33-39 | |
A354 & A490 Grade
| Standard for Bolt | Grade | Bolt Size | Tensile Strength | Yield Strength | Elongation | Hardness | |
|---|---|---|---|---|---|---|---|
| in. | ksi | ksi | % | Brinell | Rockwell C | ||
| A354 | BC | 1/4~2-1/2 | 125min | 109min | 16 | 255-331 | 26-36 |
| >2-1/2 | 115min | 99min | 16 | 235-311 | 22-33 | ||
| BD | 1/4~2-1/2 | 150min | 130min | 14 | 311-363 | 33-39 | |
| >2-1/2 | 140min | 115min | 14 | 293-363 | 31-39 | ||
| A490 | Type 1 | 1/2~1" | 150-173 | 130min | 14 | <2*D, HB 311-352; >2*D, HB…-352 | <2*D, 33-39; >2*D, HC…-39 |
| 1~1-1/2" | 150-173 | 130min | 14 | <3*D, HB313-352; >3*D, HB…-352 | <2*D, 33-39; >2*D, HC…-39 | ||
A449 Grade
| Standard for Bolt | Grade | Bolt Size | Tensile Strength | Yield Strength | Elongation | Hardness | |
|---|---|---|---|---|---|---|---|
| in. | ksi | ksi | % | Brinell | Rockwell C | ||
| A449 | Type 1 | 1/4 to 1 | 120min | 92min | 14 | 255-321 | 25-34 |
| over 1 to 1-1/2 | 105min | 81min | 14 | 223-285 | 19-30 | ||
| over 1-1/2 to 3 | 90min | 58min | 14 | 183-235 | / | ||
| Type 2 | 1/4 to 1 | 120min | 92min | 14 | 255-321 | 25-34 | |
| over 1 to 1-1/2 | 105min | 81min | 14 | 223-285 | 19-30 | ||
| over 1-1/2 to 3 | 90min | 58min | 14 | 183-235 | / | ||
A193 Grade
| Standard for Bolt | Grade | Bolt Size | Tensile Strength | Yield Strength | Elongation | Reduction of Area | Hardness | |
|---|---|---|---|---|---|---|---|---|
| in. | ksi | ksi | min% | min% | Brinell | Rockwell | ||
| A193 | B7 | to 2-1/2 | 125min | 105min | 16 | 50 | / | C35 |
| over 2-1/2 to 4 | 115min | 95min | 16 | 50 | ||||
| over 4 to 7 | 100min | 75min | 18 | 50 | ||||
| B7M | to 4 | 100min | 80min | 18 | 50 | 235 | B99 | |
| over 4 to 7 | 100min | 75min | 18 | 50 | 235 | B99 | ||
| Class 1: B8, B8M | all | 75min | 30min | 30 | 50 | 223 | B96 | |
| B16 | to 2-1/2 | 125min | 105min | 18 | 50 | 321 | C35 | |
| over 2-1/2 to 4 | 110min | 95min | 17 | 45 | 321 | C35 | ||
| over 4 to 7 | 100min | 85min | 16 | 45 | 321 | C35 | ||
| Class 2: B8M | to 3/4 | 110min | 96min | 15 | 45 | 321 | C35 | |
| over 3/4 to 1 | 120min | 80min | 20 | 45 | 321 | C35 | ||
| over 1 to 1-1/4 | 110min | 95min | 25 | 45 | 321 | C35 | ||
| over 1-1/4 to 1-1/2 | 100min | 85min | 30 | 45 | 321 | C35 | ||
ISO 898-1 2009(DIN931/933) Grade
| Standard for Bolt | Grade | Bolt Size | Tensile Strength | Yield Strength | Proof Load Stress | Elongation | Hardness |
|---|---|---|---|---|---|---|---|
| mm | MPa | MPa | MPa | % | |||
| ISO 898-1 2009 (DIN931/933) | 4.8 | 420min | 340min | 310 | - | B71-95 | |
| 5.8 | 520min | 420min | 380 | - | B 82-95 | ||
| 6.8 | 600min | 480min | 440 | - | B 89-99.5 | ||
| 8.8 | ≤16 | 800min | 640min | 580 | 12 | C22-32 | |
| >16 | 830min | 660min | 600 | 12 | C23-34 | ||
| 10.9 | 1000min | 940min | 830 | 9 | C32-39 | ||
| 12.9 | 1200min | 1100min | 970 | 8 | C39-44 |
How to Choose Bolt Surface Treatment?
Zinc plating is suitable for general corrosion protection. Hot dip galvanizing is often used for outdoor structures and infrastructure. Dacromet, Geomet, Magni and Zn-Ni coatings can be considered for higher corrosion resistance.
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