Drawing-Based Special Alloy Fasteners

Photograph of square-head positioning bolts

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Search grade, alias or UNS

Have a fastener that does not fit a catalogue shape? Send your drawing, material grade and required condition. We review custom geometries, critical tolerances, inspection needs and quantities with support from our factory before confirming the production route and quotation.

Request a quote Send your drawing

Custom FastenersRequest a quote ↗

Dimensions

Geometry, tolerances and threads

Define the datum scheme, controlling dimensions, tolerance system, thread details, transitions, holes, recesses, undercuts, end forms and edge requirements. Units and measurement conventions should be explicit.

Quality documents

Material certificate

MTC · EN 10204 3.1 included

310 fastener MTC · PDF ↗310S bar MTC · PDF ↗

Heat number traceability

Every delivery traceable by heat number

Mechanical testing

Included with every delivery

Thread inspection

GO / NO-GO gauging · sampled inspection

Product-specific review: part reference and revision, critical geometry, tolerances and mating features.

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: Diameter × length
Quantity: Pieces
Material: Grade / UNS
Requirements: Drawing / standard

Start with a drawing, specification or written requirement; a drawing is not needed for an initial enquiry. For this product, include part reference and revision, critical geometry, tolerances and mating features along with the alloy grade, condition and quantity. BYBOLT clarifies open requirements with you before confirming the quotation and arranging production. Any change to an agreed material or specification requires your approval.

Commercial terms

Indicative terms; confirmed in your quotation.

Typical MOQ

10pieces

Subject to product and material review.

Conditions

MOQ is typically 10 pieces, subject to product, material and manufacturing-route review.

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

Start with the controlled part definition

Custom fasteners are reviewed from the current drawing, model, specification or agreed written definition. Identify the part number and revision, intended assembly and which dimensions or characteristics are critical to function.

Manufacturing review

The review considers geometry, material form and condition, process sequence, tolerances, inspection access, marking, cleaning, packing and quantity. Any clarification or proposed change is returned for agreement before production scope is fixed.

Related material guides