PHILLIPS TRUSS HEAD MACHINE SCREW DIMENSIONS

Phillips truss head machine screw dimensions are shown in the following chart according to ASME B18.6.3 standard.

The truss head has a low rounded top surface with a flat bearing surface, the diameter of which for a given screw size is larger than the diameter of the corresponding pan head.

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	No.0 No.1 No.2 No.3 No.4 No.5 No.6 No.8 No.10 No.12 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4

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

Supplements:

• Unified Inch Screw Thread Sizes & Tolerances Calculator
• Dimensions for #0000, #000 and #00 Threads
• General Data on ASME Machine Screws

Reference:

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