Typical MOQ
10pieces
Subject to product and material review.
Conditions
MOQ is typically 10 pieces, subject to product, material and manufacturing-route review.
XM-19 Hex Bolts — ASTM A193/A193M Grade B8R
MaterialXM-19Change · 45 grades
- Material
- XM-19 · UNS S20910 · NITRONIC 50
- Material focus
- Nitrogen-strengthened · corrosion resistance
- Common applications
- Seawater pumps & valves · chemical-process equipment
- Main elementsComposition limits · wt.%
- Cr 20.5–23.5%
- Ni 11.5–13.5%
- Mn 4–6%
- Mo 1.5–3.0%
- N 0.20–0.40%
Standards & threads
Finished boltASTM A193/A193M Grade B8RS20910 · B8R bolting route
Specify the A193 class, edition, treatment and applicable A962/A962M requirements. Do not label high-strength XM-19 bar as a finished B8R bolt without the required tests.
The producer identifies B8R for bolts and 8R under A194 for nuts. Keep those product roles separate.
Raw material specificationASTM A276/A276M / ASTM A479/A479MUNS S20910
S20910 / XM-19 · stainless bar
Specify annealed or higher-strength worked condition. Generic Nitronic 50 bar strength does not identify a bolting class.
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.
Heat treatment / conditionAnnealed
Reference condition from material data. The ordered condition is agreed in your quotation.
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
Strength condition
S20910, annealed or strengthened condition and required properties.
Avoids assigning high-strength bar values to an annealed enquiry.
Section and processing
Bolt diameter, starting-stock section and final manufacturing condition.
Makes size and processing effects visible in the acceptance basis.
Evidence scope
Certificate condition, mechanical results and sampling location when specified.
Links the reported properties to the material and section ordered.
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
Is high-strength XM-19 bar automatically an A193 B8R bolt?
B8R is a bolting route, while the bar condition describes the starting material. Specify the applicable A193 class, treatment, edition and final tests with A962/A962M requirements. Trace the completed bolt results to the ordered S20910 material.
Should I use B8R or 8R when specifying the matching components?
The producer reference identifies A193 B8R for bolts and A194 8R for nuts. Keep the component roles separate and confirm the ordered class, properties and thread fit for the actual assembly.
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 XM-19 bolt
Send a drawing or add your dimensions and quantity.
Continue to enquiry ↗
Combine several products in one enquiry
XM-19 hex boltsEnquire ↗