Typical MOQ
10pieces
Subject to product and material review.
Conditions
MOQ is typically 10 pieces, subject to product, material and manufacturing-route review.
904L Hex Bolts
Material904LChange · 45 grades
- Material
- 904L · UNS N08904 · Stainless steel 904L
- Material focus
- Corrosion resistance in chemical processing
- Common applications
- Acid-handling equipment · process systems
- Main elementsComposition limits · wt.%
- Cr 19–23%
- Ni 23–28%
- Mo 4–5%
- Cu 1–2%
Standards & threads
Finished boltDrawing-defined acceptanceNo grade-specific finished-bolt specification was established in the reviewed sources.
Define final tensile / hardness requirements and any corrosion acceptance for the stated acid concentration, chlorides and temperature.
Older 904L data may cite B649. Do not use that historical listing as current N08904 coverage under B649-26.
Raw material specificationASTM A479/A479MUNS N08904
N08904 · stainless bar
Specify N08904 and the required annealed condition. B649-26 explicitly directs former N08904 products to A479/A479M and A484/A484M.
Dimensions · metricISO 4014 / ISO 4017Coarse pitch · partial-thread bolts / full-thread hex screws
Dimensions · inchASME B18.2.1Inch hex bolts / hex cap screws
Select the bolt or cap-screw pattern, head dimensions and thread length. Hex and heavy hex are different choices.
Threads · metricISO 261 / ISO 965-1Metric M · pitch plan and tolerance system
Threads · UNC / UNFASME B1.1Unified inch · coarse / fine series
State diameter, TPI, series and external class: e.g. 1/2-13 UNC-2A or 1/2-20 UNF-2A. Select 2A / 3A with the mating-thread fit; UNC and UNF do not mate.
Mechanical testing ASTM F606/F606M
Mechanical test methods for fasteners; select applicable tensile, yield and hardness tests. This standard supplies methods, not a material grade or pass/fail limits. Define those limits and sampling in the part specification.
Test-method reference ↗Sources & editions Reviewed 2026-10-19
Historical samples support the stated grade coverage. The ordered edition controls the full requirements.
Preview your dimensions
Example dimensions, not a stock size.
Simplified right-hand thread appearance. No tolerance, fit or standard compliance is simulated.
Head dimensions · optional
Head proportions are illustrative: s = 1.5d, k = 0.625d. They are not standard-table values and will not be submitted as specified dimensions.
Quality documents
Heat number traceability
Every delivery traceable by heat number
Mechanical testing
Included with every delivery
Thread inspection
GO / NO-GO gauging · sampled inspection
Methods, sampling and acceptance criteria follow the agreed specification. PMI, third-party inspection and additional records are agreed separately.
Before production and at delivery
During quotation, a redacted certificate from a previous order can show the document format and recorded tests. It is a historical example, not certification of this product or a new order. Shipment documents must correspond to the material and batch actually supplied.
How to read a historical certificate sample ↗Prepare your enquiry
Send a drawing and quantity.
No drawing? Use these details.
- Size
- d × L Diameter × under-head length
- Quantity
- Pieces Required quantity per size
- Thread
- Metric / UNC / UNF Pitch or TPI + thread class
- Coverage
- Full / Partial For partial, include threaded length
Full material checklist
Acid exposure
Acid species, concentration, temperature and contaminants.
Provides a meaningful basis for comparison with Incoloy 020.
Bar condition
N08904, A479/A479M with A484/A484M general requirements and specified solution-annealed condition.
Defines the stock certificate and processing basis.
Bolt acceptance
Required mechanical properties, thread class and final inspection.
Prevents material chemistry being mistaken for a fastener strength class.
Commercial terms
Indicative terms; confirmed in your quotation.
Sample review
~20days
Freight, import duties and taxes are separate.
Conditions
Samples are typically reviewed on an approximately 20-day basis. BYBOLT may cover agreed sample manufacturing; buyer freight, import duties and taxes remain separate.
Production review
25–35days
Urgent requirements can be discussed.
Conditions
Regular production is commonly reviewed on a 25–35 day basis. Urgent requirements can be discussed against the complete specification.
Typical deposit
30%
T/T or LianLian. Balance before dispatch.
Conditions
Payment can be arranged by T/T or LianLian. A typical order uses a 30% deposit, with the balance completed before dispatch.
Technical help
Why does this 904L page use A479 rather than B649?
B649-26 explicitly directs N08904 products to A479/A479M and A484/A484M. Older 904L documents may cite B649. Check the edition on the drawing and identify the current or explicitly agreed legacy material basis for the order.
What should I compare when choosing between 904L and Incoloy 020 bolts?
Compare acid species, concentration, temperature and contaminants using the same joint requirements. State the final material condition and bolt mechanical acceptance for each candidate. Similar application descriptions do not make the grades interchangeable.
Read a thread designation Metric / UNC / UNF
M12 × 1.75–6g12 mm diameter · 1.75 mm pitch · external class 6g
1/2-13 UNC-2A1/2 inch · 13 TPI · coarse · external class 2A
1/2-20 UNF-2A1/2 inch · 20 TPI · fine · external class 2A
Examples explain designations, not available sizes. Specify fine pitch explicitly. UNC and UNF do not mate; full or partial threading is a separate choice.
Thread classes and inspection ↗Related material guides
Download the PO and receiving checklist (PDF)
Guides for your enquiry
Specify your 904L bolt
Send a drawing or add your dimensions and quantity.
Continue to enquiry ↗
Combine several products in one enquiry
904L hex boltsEnquire ↗