Typical MOQ
10pieces
Subject to product and material review.
Conditions
MOQ is typically 10 pieces, subject to product, material and manufacturing-route review.
420 Hex Bolts
Material420Change · 45 grades
- Material
- 420 · UNS S42000 · Stainless steel 420
- Material focus
- Hardness & wear resistance after heat treatment
- Common applications
- Wear-resistant parts · precision components
- Main elementstypical · wt.%
- Cr 13%
- C 0.20%
Standards & threads
Finished boltDrawing-defined acceptanceNo grade-specific finished-bolt specification was established in the reviewed sources.
Define the finished heat-treatment condition, hardness range, tensile acceptance and any toughness requirement.
420 is not the 410 or 431 entry in the reviewed F593 scope. Do not assign an F593 group from the martensitic family alone.
Raw material specificationASTM A276/A276MUNS S42000
S42000 · 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.
Heat treatment / conditionAnnealed
Reference specimen: Rod
Reference condition from material data. The ordered condition is agreed in your quotation.
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
Hardness and toughness
Hardness range / scale plus required strength or toughness acceptance.
Avoids optimizing a wear property without the joint requirements.
Treatment and section
Final treatment condition and nominal bolt section.
Makes the hardening requirement relevant to the ordered geometry.
Final inspection stage
Hardness sampling and thread / dimensional inspection after final processing.
Checks the completed part rather than only the starting material.
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 420 covered by the F593 groups for 410 or 431?
The reviewed scope identifies those other martensitic grades, not 420. Use the A276/A276M stock route for S42000 and define the final bolt heat treatment, mechanical limits and inspection plan explicitly.
Is a hardness requirement enough for a 420 bolt?
Include the required tensile acceptance and any toughness criteria for the joint as well as the hardness range and scale. State the bolt section and final treatment so the inspection plan evaluates the completed part.
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 420 bolt
Send a drawing or add your dimensions and quantity.
Continue to enquiry ↗
Combine several products in one enquiry
420 hex boltsEnquire ↗