Skip to content

// TECHNICAL RESOURCES

Machine Screws.

A family reference for specification-controlled hardware. Identify the relevant series and the details needed to source the required part.

// DIMENSION GUIDE

Machine-screw length and thread diameter

Machine-screw length and thread diameter
L is the length from the bearing surface under the head to the tip. d identifies nominal thread diameter. This raised-head example does not show the length convention for countersunk screws.

Schematic only; not to scale. Letter labels are keys for this illustration. Use the applicable part specification for dimensions, tolerances and measurement conventions.

// IDENTIFICATION

Identify the head, recess and thread.

A pan head sits above the bearing surface. A countersunk head fits a matching seat; the included angle is part of the requirement. A drilled fillister head adds another configuration that must be preserved.

Keep coarse and fine thread references distinct. MS51957 and MS51958 are separate series; MS24693 uses a 100-degree head while MS51959 is associated with an 82-degree head.

// REFERENCE TABLE

Series in this family

Machine screws series directory
SeriesProduct descriptionFamilyResource
MS24693100° flat cross-recessed machine screwsMachine screwsFamily reference →
MS3519082° flat cross-recessed machine screws, coarse threadMachine screwsFamily reference →
MS3519182° flat cross-recessed machine screws, fine threadMachine screwsFamily reference →
MS35206Pan head cross-recessed machine screws, carbon steel, UNCMachine screwsFamily reference →
MS35207Pan head cross-recessed machine screws, fine threadMachine screwsFamily reference →
MS35265Drilled slotted fillister machine screws, coarse threadMachine screwsFamily reference →
MS35266Drilled slotted fillister machine screws, fine threadMachine screwsFamily reference →
MS35275Drilled slotted fillister machine screws, coarse thread, stainlessMachine screwsFamily reference →
MS35276Drilled slotted fillister machine screws, fine thread, stainlessMachine screwsFamily reference →
MS51957Pan head cross-recessed machine screws, corrosion-resistant steel, UNCMachine screwsRead guide →
MS51958Pan head cross-recessed machine screws, fine thread, stainlessMachine screwsFamily reference →
MS5195982° flat cross-recessed machine screws, corrosion-resistant steel, UNCMachine screwsFamily reference →
MS5196082° flat cross-recessed machine screws, fine thread, stainlessMachine screwsFamily reference →
MS21318Type U round-head drive screwsMachine screwsFamily reference →
MS51861Pan head Type AB tapping screwsMachine screwsFamily reference →

// PREPARE AN RFQ

What to confirm on the drawing

Head style and angle; drive/recess; nominal diameter; pitch; length convention; material and finish.

// REFERENCE SCOPE

Reference scope

The table groups hardware by catalog family. It does not certify dimensions or current stock. For a document-level status finding, use the cross-reference page; for a dimensional table, use the linked guide.

// SOURCE WITH WEBSON

Have a part number or bill of material?

Send the complete designation, quantity, required delivery date and documentation requirements. Webson will review your requirement for quotation.