Heavy-Duty Carbon Steel F959 Bolt Washer for Engineering Projects
Product Specifications
- F959
Contact Supplier
Product Highlights
- Fully compliant with ASTM F959 / F959M international industrial standards, universal for global structural projects
- High-precision tension sensing design, real-time bolt tension monitoring to avoid structural loosening risks
- Made of high-strength carbon steel and alloy steel base materials, excellent compression resistance for heavy-duty industrial applications
- Perfectly compatible with A325, A490 and other mainstream structural bolts for accurate assembly
- Available in hot-dip galvanized, black oxide and other finishes, anti-corrosion and anti-aging for harsh working environments
- High-precision integral stamping process with tight dimensional tolerance, flat surface and perfect fitting performance
- Complete size coverage of F959 imperial and F959M metric series to meet global diverse assembly requirements
- Widely applied in steel structure, bridge engineering, wind power, marine and heavy construction projects
- Uniform material structure and stable force bearing, long service life and low maintenance cost
- Support bulk customization and OEM service, sufficient stock and stable supply for large-scale engineering procurement
Product Attributes
- Customization
- Available
- Type
- Flat Gasket
- Material
- Carbon Steel
- Model NO.
- F959
- Combination Washer Structure
- A Type
- Combination Washer Packaging
- No
- Spring Washer Type
- Standard
- Standard Compliance
- Compliant with ASTM F959 / F959m International Ind
- Core Function
- High-Precision Design for Accurate Bolt Tension Mo
- Premium Material
- High-Strength Carbon Steel Base, Pressure and Defo
- Wide Compatibility
- Compatible with A325, A490 and 8.8-12.9 Grade Stru
- Surface Finish
- Available in HDG, Black Oxide, Zinc Plated Anti-Co
- Precise Dimension
- Standard Tolerance, Complete Metric & Imperial Siz
- Stable Structure
- One-Piece Stamping Structure with Uniform Force Be
- Application Scenarios
- Widely Used in Wind Power, Bridge, Steel Structure
- Environmental Resistance
- Excellent Anti-Corrosion and Anti-Aging for Harsh
- Custom Service
- Support Bulk Customization and Stable Mass Supply
- Transport Package
- Box, Carton, Pallet
- Specification
- 1/2" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4" 1-3/8" 1-1/2"
- Trademark
- vkf
- Origin
- China
- HS Code
- 7318220000
- Production Capacity
- 300 Tons/Month
- Package Size
- 25.00cm * 23.00cm * 15.00cm
- Package Gross Weight
- 5.000kg
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
Product Images of Heavy-Duty Carbon Steel F959 Bolt Washer for Engineering Projects
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Product Description





Nominal Size | Nominal Size | OD (max, in) | Initial Thickness (in) | Compressed Thickness (in) | No. of Protrusions |
1/2" | 0.527 / 0.533 | 1.187 | 0.180 | 0.120 | 4 |
5/8" | 0.659 / 0.665 | 1.437 | 0.200 | 0.130 | 4 |
3/4" | 0.790 / 0.796 | 1.625 | 0.215 | 0.140 | 5 |
7/8" | 0.921 / 0.927 | 1.875 | 0.235 | 0.160 | 5 |
1" | 1.053 / 1.059 | 2.125 | 0.250 | 0.170 | 6 |
1-1/8" | 1.184 / 1.190 | 2.375 | 0.260 | 0.180 | 6 |
1-1/4" | 1.316 / 1.322 | 2.625 | 0.265 | 0.185 | 6 |
1-3/8" | 1.447 / 1.453 | 2.875 | 0.270 | 0.190 | 7 |
1-1/2" | 1.577 / 1.583 | 3.000 | 0.270 | 0.190 | 8 |
Nominal Size | ID (min/max, mm) | OD (max, mm) | Initial Thickness (mm) | Compressed Thickness (mm) | No. of Protrusions |
M12 | 13.0 / 13.43 | 25 | 4.2 | 3.0 | 3 |
M16 | 17.0 / 17.43 | 33 | 4.8 | 3.5 | 4 |
M20 | 21.0 / 21.43 | 40 | 5.0 | 3.7 | 5 |
M22 | 23.0 / 23.43 | 44 | 5.1 | 3.8 | 5 |
M24 | 25.0 / 25.43 | 48 | 5.2 | 3.9 | 6 |
M27 | 28.0 / 28.43 | 54 | 5.5 | 4.1 | 6 |
M30 | 31.0 / 31.43 | 60 | 5.8 | 4.3 | 6 |
M36 | 37.0 / 37.43 | 72 | 6.2 | 4.5 | 7 |
DTI Function: Direct Tension Indicator – protrusions flatten to compressed thickness when design preload is reached.
Tolerance: ID ±0.03 mm (metric) / ±0.002 in (inch); OD ±0.1 mm / ±0.005 in.
Coating: Hot-dip galvanized (HDG) DTIs have slightly larger ID/OD to compensate for coating thickness.
Types: Type 325-1/325-3 for A325 bolts; Type 490-1/490-3 for A490 bolts (inch series).














Category | Product Type / Standard No. | Category | Product Type / Standard No. |
Bolt | DIN928 | Rod | threaded rod DIN975 |
Bolt | DIN933 | Rod | DIN976 |
Bolt | DIN931 | Rod | threaded bar DIN975 stud bolt |
Bolt | DIN912 | Rod | B7 stud bolt |
Bolt | DIN603 | Screw | hex screw DIN912 |
Bolt | DIN7985 | Screw | self drilling screw DIN7504 |
Bolt | DIN7991 | Screw | self tapping screw DIN7981/7982 |
Bolt | DIN6921 | Screw | drywall screw |
Bolt | ASME/ANSI B18.2.1 | Screw | panhead screw |
Bolt | ASME/ANSI B18.2.3.1M | Screw | button head screw |
Bolt | GB | Screw | machine screw |
Bolt | BSW | Screw | chipboard screw |
Bolt | ISO Hex bolt | Screw | furniture screw |
Bolt | carriage bolt | Screw | wood screw |
Bolt | heavy hex bolt | Washer | flat washer DIN125 |
Bolt | flange head bolt | Washer | spring washer DIN127 |
Bolt | anchor bolt | Washer | lock washer |
Nut | DIN934 | Washer | square washer |
Nut | DIN6923 | Washer | spring lock washer |
Nut | DIN985 | Washer | plain washer |
Nut | ISO4032 hex heavy hex nut | Washer | F436 |
Nut | 2H nut | Washer | DIN6916 |
Nut | A563/A563M cap nut | Washer | DIN436 |
Nut | nylon nut | DTI Washers | ASTM F959/F959M |
2. Many years of export experiences.
3. Specification list is avaliable upon your request.
4. Welcome to send requry, we will reply soon.
5. Prompt shipment with professional documents.
6. Custom packing with photo bafore shipment.
7. High quality and competitive price.
About the Supplier
This supplier has been audited by BV. Verify the report on the official BV website with ID "MIC-ASI265725". Items marked "" are certified.
Company Profile
The company has grown into a one-stop procurement center for fasteners, supplying a full range of fastener products. Starting with general civil components, we have continuously improved our management, technologies and supply chain integration capabilities, and successfully expanded into high-precision machining for high-end civilian and military sectors, with a machining accuracy up to 0.01mm.
Our highlight lies in precision stamping: We can produce products of such accuracy directly via stamping without secondary machining. This process guarantees high precision while greatly cutting production costs, enabling us to maintain a leading position in the MID-to-high-end machining industry.
Throughout our development, we have established in-depth industry-university-research cooperation with top engineering universities. We jointly carry out product development and testing, keeping our applied technologies at the cutting edge and integrating them with advanced academic theories.
To meet customers' increasingly complex customized requirements and reduce their technical difficulties in procurement, we have forged strategic partnerships and fully integrated the supply chain. We have built a comprehensive process matrix covering metallic and special materials:
Metallic Materials: Titanium, Copper, Aluminum, Stainless Steel, High-temperature Alloy Steel, Alloy Steel, Carbon Steel
Special Materials: Carbon, Carbon Fiber, PEEK, Nylon
We offer a complete lineup of mainstream processing technologies, including 3D printing, stamping, drawing, bending, precision casting, powder metallurgy, machining, cold heading, hot forging, forging and precision grinding. Among them, four core technologies - 3D printing, machining, powder metallurgy and stamping - have reached world-class standards.
Our products are widely applied in large-scale infrastructure, heavy steel structures, wind power, marine, petrochemical, automotive, aerospace and military industries. With precise, reliable and efficient services, we help customers from all sectors create greater value.
About Our Factory & Business Background
- Address
- No. 502, Building 3, Guanggu Research and Innovation Center, Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province
- Terms of Payment
- LC, T/T, D/P, Western Union
- International Commercial Terms(Incoterms)
- FOB, EXW, CIF, DDP
- Average Lead Time
-
Peak Season Lead Time: 1-3 months
Off Season Lead Time: 1-3 months - Nearest Port
- shanghai, tianjin, ningbo
Our Production Capability & Technical Expertise
- Main Products
- Washers, Aerospace Fasteners, Nuts, Screws, Bolts, Gasket & Washer, Precision Fasteners, Precision Stamping, High-Strength Fasteners, Heavy-Duty Bolts & Nuts
-
Customization Options
- Customization from Samples, Customization from Designs, Full Customization, Minor Customization, Flexible customization
-
ODM Service Available
- Yes
-
OEM Service Available
- Yes
-
R&D Engineers
- 1 people
Our Industry Experience & Global Business Record
- Export Year
- 2023-03-01
- Main Markets
- North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
-
New Products Launched in Last year
- No
FAQ
- How long is your delivery time?
- Generally it is 5-10 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, it is according to quantity.
- Do you provide samples?is it free or extra?
- Yes, we could offer the sample for free charge but do not pay the cost of freight.
- What is your terms of payment?
- Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment.
- Can you send me a price list?
- Due to a lot of kinds of fasteners, we quote prices accoridng to sizes, quantity, packing only.
- What is the difference between F959 and F959M DTI washers?
- ASTM F959 refers to imperial inch-size DTI washers, while ASTM F959M represents metric millimeter-size DTI washers. They are designed for different standard structural bolts with identical tension detection function and high-strength performance.
- What bolts match F959 / F959M washers?
- These DTI washers are perfectly suitable for A325, A490 imperial structural bolts and 8.8/10.9/12.9 grade metric high-strength structural bolts.
- Are these standard size DTI washers customizable?
- We provide standard DTI washers with complete sizes, and support customized surface treatment, non-standard dimensions and bulk OEM processing for large construction and wind power projects.
- Application Scenarios:
- Steel structure construction, bridge engineering, wind power generation, heavy industrial equipment
- Matched Fasteners:
- A325, A490 High Strength Structural Bolts
- Executive Standard:
- ASTM F959-2017, ASTM F959M-2017
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