Grease (Zerk) fittings: SAE-LT 1/4-28, 1/8 PTF and DIN 71412 forms A, B, C (M6, M8, M10, R1/8, R1/4) — hex size, overall length, 45° / 90°

sizes

56 in table

Notes

• SAE grease fittings (the 'Zerk' type): the common thread is 1/4-28 taper, called SAE-LT on the Alemite sheets, assembled into a 1/4-28 UNF class 3B straight threaded hole (Alemite: modified maximum minor diameter 0.2151 in), and 1/8 PTF (Dryseal pipe thread, tapered; the Alemite sheet prints 'SAE SPL' on the short ones). The SAE J534 document itself was not read, so no value is attributed to it; the rows are the makers' tables. Alemite's columns: hex size, overall length, shank length. Straight 1/4-28 fittings are 5/16 in hex (3/8 in hex for the angled ones), 17/32 to 1-5/8 in overall; 1/8 PTF fittings are mostly 7/16 in hex.
• McMaster-Carr's table for zinc-plated 1/4-28 SAE-LT fittings agrees on hex size and overall length with Alemite for the straight 35/64, 11/16, 31/32, 1-1/8 and 1-5/8 in fittings and the 3/4 in 90° one, but its 'thread length' column (7/64, 13/64, 13/64, 13/64, 1/4 in) is not Alemite's shank length (3/16, 23/64, 5/8, 25/32, 1 in); Alemite's 45° 13/16 in fitting has a 13/64 in shank against McMaster's 5/32 in thread length. McMaster also lists self-tapping, 65° and 303 stainless fittings; only the plain ones are shown. Drive-type (push-in) fittings and the double 70° fitting on the Alemite sheets are not tabulated.
• DIN 71412 (conical-head grease nipples): the AFT / Kipp K1132 sheets give form A (straight) and form B (45°) for M6x1, M8x1, M8x1.25, M10x1, M10x1.5, R1/8 and R1/4, with their own letters (A, D, L1, L max, SW) that the sheet does not define; SW is read as the hex wrench size since it matches the usual values (7, 9, 11, 14 mm). Form C (90°, Bollhoff): M6x1 and M8x1 s 9 mm, l 14.3 mm; M10x1 s 11 mm, l 15.3 mm. A Wuerth form B M10x1 listing prints thread length 5.5 mm, wrench size 11 and overall length 25 mm; AFT's form B prints L max 23 for the same nut, so the overall length of form B is shown as printed by each. Form A SW for M6 is 7 mm (AFT) and for form C Bollhoff prints 9 mm: the forms have different hex sizes. The DIN text itself was not read. Steel versions are hardened to min 550 HV 1 and zinc-plated; stainless to 1.4305 (AFT).
• No file: the ball-check head profile (spherical head diameter, neck) and the hex height are not published as numbers in any source read; a hex-plus-cylinder envelope would not describe the part. McMaster-Carr sells grease fittings with per-part STEP; its 1/4-28 SAE-LT category is linked, not copied. Thread data for the pipe-thread versions: npt-thread-dimensions-asme-b1-20-1, an-jic-37-degree-flare-fittings.

Grease (Zerk) fittings: SAE-LT 1/4-28, 1/8 PTF and DIN 71412 forms… size chart

Where the files are

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

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Plain text: sheet.txt · JSON: /api/geometry?object=grease-fittings-sae-j534-din-71412

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