COMBO PAN HEAD MACHINE SCREW DIMENSIONS

Combo (Slotted - Phillips) pan head screw dimensions according to ASME B18.6.3 standard.

The slotted pan head has a flat top surface rounded into cylindrical sides and a flat bearing surface. The recessed pan head has a rounded top surface blending into cylindrical sides and a flat bearing surface.

Some important notes from the ASME B18.6.3:

- Thread dimensions for the No.0000, No.000 and No.00 sizes are also included in the standard.

- The general data about the head height, bearing surface, gaging of recess, slot, length, tolerance on length, length of thread, points, finish, workmanship and designation of machine screws are given in the standard.

INPUT PARAMETERS
Nominal screw size


RESULTS
Nom. Size	---	---
Basic Dia.	---	---
Head Diameter (A)	max	---
Head Diameter (A)	min	---
Head Height (H)	max	---
Head Height (H)	min	---
Head Radius (R)	min	---
Slot Width (W)	max	---
Slot Width (W)	min	---
Slot Depth (D)	max	---
Slot Depth (D)	min	---
Recess Diameter (M)	ref	---
Recess Depth (T)	ref	---
Recess Width (N)	ref	---
Driver Size	---	---
Recess Penetration Gaging Depth (P)	max	---
Recess Penetration Gaging Depth (P)	min	---

Note 1: Dimensions in this calculator are in inches.

Note 2: Machine screws shall have a definite underhead fillet large enough to ensure that full fastener strength is achieved. The radius of the fillet under countersunk head screws shall be no greater than 40% of the basic screw diameter. The radius of the fillet under truss heads and number 6 sized pan heads shall be no greater than 25% of the basic screw diameter. The radius of the fillet under all other head styles shall be no greater than 15% of the basic screw diameter.

Note 3: Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than slotted pan heads.

Supplements:

Reference:

ASME B18.6.3 - 2003, Machine Screws and Machine Screw Nuts