Typical MOQ
10pieces
Subject to product and material review.
Conditions
MOQ is typically 10 pieces, subject to product, material and manufacturing-route review.
310S Hex Bolts
Material310SChange · 45 grades
- Material
- 310S · UNS S31008 · Stainless steel 310S
- Material focus
- High-temperature oxidation resistance
- Common applications
- Furnace supports · heat-treatment trays
- Main elementsComposition limits · wt.%
- Cr 24–26%
- Ni 19–22%
- C ≤0.08%
- Mn ≤2.0%
Standards & threads
Finished boltDrawing-defined acceptanceNo grade-specific finished-bolt specification was established in the reviewed sources.
Set final mechanical acceptance and any elevated-temperature / sustained-load tests independently of oxidation resistance.
The reviewed F2281 list includes 310 / S31000. That does not automatically qualify 310S / S31008.
Raw material specificationASTM A276/A276M / ASTM A479/A479MUNS S31008
S31008 · stainless bar
Specify the exact grade, stock condition and product form. Bar acceptance must be distinguished from plate or tube data.
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
Thermal atmosphere
Gas chemistry, temperature cycle and exposure duration.
Gives a defined basis for oxidation and thermal-service review.
Load acceptance
Required properties at the specified test temperature and duration.
Keeps scaling resistance separate from allowable joint loading.
Product-form reference
S31008; A276/A276M or A479/A479M bar, plus defined finished-bolt tests and limits.
Prevents tube or plate references becoming the bolt specification.
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
Can I use the F2281 Type 310 entry for 310S bolts?
The reviewed Type 310 entry identifies S31000, while 310S is S31008. Confirm the exact grade coverage before using that bolting route. The verified 310S bar routes are A276/A276M and A479/A479M.
What hot-service information belongs on a 310S bolt enquiry?
Include gas chemistry, temperature cycles and load duration, together with the final condition and required test properties. Specify any elevated-temperature acceptance explicitly so oxidation behaviour and joint loading are reviewed on their own terms.
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 310S bolt
Send a drawing or add your dimensions and quantity.
Continue to enquiry ↗
Combine several products in one enquiry
310S hex boltsEnquire ↗