Socket Head Cap Screws

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Cylindrical-head screws with an internal hexagon drive.

Metric thread diameter: M1.2–M100
Inch thread diameter: #00–4 in

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Thread pitch: Coarse or fine
Drive: Hexagon socket
Thread coverage: Full or partial thread

Thread systems: Metric / inch

Socket ScrewsRequest a quote ↗

Standards & specifications

Dimensional standards / referencesISO 4762 · ASME B18.3; DIN 912 when specified

Preview your dimensions

Enter the dimensions you know to update the model. Blank fields use illustrative proportions and are excluded from your enquiry. You can send a drawing without filling these fields.

Illustrative shape with simplified threads, recesses and edges. No tolerance, fit, load or standard compliance is simulated.

Length unitsThread series

d · Nominal thread diametermmMeasure across the thread crests to help identify the size. Also provide the thread designation and pitch P, for example M10 × 1.5.L · Length under headmmMeasure the distance between the two indicated end faces.P · Thread pitchmmDistance between adjacent threads in the selected length unit. For inch threads, enter 1 / TPI.dₖ · Head diametermmMeasure the diameter through the centre, not the radius.s · Socket across flatsmmMeasure between two opposite flat faces, not corners.t · Socket depthmmMeasure the distance between the two indicated end faces.

Measurement notes

Illustrative geometry with simplified thread and drive details; confirm the actual drawing before manufacture.

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: head and socket form, length datum, thread designation and threaded length.

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 head and socket form, length datum, thread designation and threaded length 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.

Order checklist

Head diameter and height, or countersunk angle and reference diameter where applicable.

Socket size, depth and permitted corner condition.

Nominal thread, pitch or TPI, class, hand, threaded length and runout.

Under-head or overall length and end preparation.

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

Head, drive and product identity

Socket screws are identified by the complete head and internal-drive form, not by the word socket alone. Provide the controlled drawing or product definition for low-head, button-head, countersunk, set-screw or other forms.

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