MS51960 fine-thread 82-degree flat-head screws.

// PART IDENTIFICATION

Identify the thread, head and material

MS51960 identifies cross-recessed, 82-degree flat countersunk-head machine screws in corrosion-resistant steel with UNF-2A threads. This table selects 112 unsuffixed references from 0-80 through 3/8-24. Entries marked inactive for new design in the reviewed MS51960D table are omitted.

// REFERENCE SIZES

MS51960 part-number and dimension table

Reference sizes for identification and quotation; availability is confirmed by inquiry. These rows do not indicate Webson stock.

Head diameter is the maximum theoretical sharp-head diameter from the reviewed drawing, not the minimum finished head diameter. The included head-angle limits are 80–82 degrees. Short screws may have undercut heads with separate height limits. Use the governing drawing for countersink design and inspection.

// LENGTH CONVENTION

Measure the correct length

Overall length includes the countersunk head. The length column preserves the decimal values printed in MS51960D Table I, including 0.12, 0.19 and 0.62; these are reference table values, not an added acceptance tolerance. MS51960-65 identifies a 10-32 by 0.50-inch reference.

// ORDERING DETAILS

Keep finish and locking codes with the part

MS51960D specifies 300-series corrosion-resistant steel and passivation. B identifies black oxide and L identifies a self-locking element; the order is BL when both apply. MS51960-65BL is the drawing’s example of a 10-32, 0.50-inch screw with black oxide and a self-locking element. Suffixes are not interchangeable with the unsuffixed references in this table.

// RELATED REFERENCES

Compare related screw families

// DRAWING REQUIREMENTS

Use the issue required by your drawing

Dimensions summarize MS51960D, pages 1–3, 20 April 2011. This is a selected purchasing reference. Send the complete part designation and governing specification issue for quotation; the required issue controls full dimensions, tolerances, material, finish and documentation.