Machine screws, inch (ASME B18.6.3): pan, 82° flat, round, truss, fillister heads #0 to 1/2 — head, slot and recess sizes + envelope models

length

32.5 mm

width

25.1 mm

height

32.5 mm

Notes

• Inch dimensions as printed on the ASME B18.6.3 tables: A = head diameter, H or k = head height, J or n = slot width, T or t = slot depth, max / min. Columns after the size are TPI for the coarse (UNC) and fine (UNF) series (#0 exists only as 0-80 UNF), the head dimensions, and 'other' (pan head radius R and Phillips recess diameter and width; round and truss recess diameter M, recess depth G and driver number; flat head angle). The last column is the max head diameter and height converted to mm (computed, x 25.4).
• Cross-checks: GlobalFastener's ASME B18.6.3-2013 slotted pan table and Engineers Edge's ANSI B18.6.3 pan table agree on head diameter A, head height H, head radius R, slot width J and slot depth T for every size #0 to 3/4 (Engineers Edge does not label max or min, its values equal the max column); AFT's pan table agrees on the head diameter and height maxima (for example #6: 0.270 and 0.082). AFT's 82° flat table (dk .262 / .238 and k .083 for #6) agrees with GlobalFastener's ASME B18.6.3-2013 Table 1. The round table is Tanner Bolt's ASME B18.6.3-2002 sheet and the truss table a single maker sheet (2010 edition); neither was cross-checked against a second source. Older and newer editions differ slightly in places, so check the edition your drawing calls out.
• Fillister heads: Westfield's UNC table and AFT's fillister table print identical numbers but both have misaligned column headers. The first pair is the head diameter A (max / min, for example #6 0.226 / 0.208) and is shown; the other pairs are shown by print position only ('printed pair 2, 3'), not named, because neither source labels them in a way that can be checked. For that reason no fillister models are drawn. The inch fillister numbers also appear in McMaster-Carr's fillister catalogue page, linked below.
• The 82° flat head (ASME B18.6.3 Table 1) has a head angle of 82° max and 80° min on every size, and a published head height 'k ref'. Screws at or below a stated length (1/8 in for #0 to #3, 3/16 in for #4 to #6, and so on up to 3/4 in for 1/2) have undercut heads (GlobalFastener note). The model uses the 82° cone from A max to the nominal body diameter; its height is computed from those two numbers and is shorter than the published k ref, which is not used for the geometry.
• Files are Xem-drawn envelopes at true nominal size: pan = cylinder A max x H max with the published head radius R max on the top edge; round and truss = a spherical cap through A max and H max (the real head has a short cylindrical side that no source gave as a number); flat = the 82° cone. All have the slot J max wide and T min deep, and a plain shank at the nominal diameter. No thread, no Phillips cross (only its diameter and width are published) and no point. Example lengths (0.25 in for #0 to #3, 0.5 in for #4 to #12, 0.75 in for 1/4 to 3/8, 1 in for 7/16 and 1/2) are Xem's choice. Pan: #0 to 1/2 (15), flat: #0 to 1/2 (15), round: #2 to 1/2 (12), truss: #2 to 1/2 (12).
• Overlap: the older page imperial-machine-screws lists #4-40, #6-32, #8-32 and 1/4-20 (clearance and tap drills, socket head files). Socket head cap screws, inch: socket-head-cap-screws-inch-full. Thread, tap drill and clearance values: thread-reference-tap-drills-clearance.

Machine screws, inch (ASME B18.6.3): pan, 82° flat, round, truss… size chart

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 54 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=machine-screws-inch-asme-b18-6-3

Fits with

Free

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