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° — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/grease-fittings-sae-j534-din-71412/ (sheet CC BY 4.0) Basis: Alemite's data sheets for 1/4-28 SAE-LT and 1/8 PTF fittings (with McMaster-Carr's category table as a cross-check), AFT / Kipp K1132 data sheets for DIN 71412 forms A and B, Bollhoff's form C sheet and a Wuerth form B listing; numbers only Catalog version: 2026-10-20 Sizes: see table below - 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. source / series part or material thread form / angle hex (AF) overall length shank / thread length / other note Alemite, 1/4-28 taper (SAE-LT) 1641-B 1/4-28 SAE-LT straight 5/16 in 35/64 in 3/16 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1652-B 1/4-28 SAE-LT straight 5/16 in 11/16 in 23/64 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1680-B 1/4-28 SAE-LT straight 5/16 in 31/32 in 5/8 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1698-B 1/4-28 SAE-LT straight 5/16 in 1-1/8 in 25/32 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 3014-B 1/4-28 SAE-LT straight 5/16 in 1-5/8 in 1 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1637-B1 1/4-28 SAE-LT 45° 3/8 in 13/16 in 13/64 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 3010-B1 1/4-28 SAE-LT 65° 3/8 in 25/32 in 19/64 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1911-B1 1/4-28 SAE-LT 90° 3/8 in 3/4 in 13/64 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1966-S (stainless) 1/4-28 SAE-LT straight 5/16 in 17/32 in 3/16 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1968-S (stainless) 1/4-28 SAE-LT 45° 3/8 in 13/16 in 13/64 in (shank) Alemite data sheets Alemite, 1/4-28 taper (SAE-LT) 1969-S (stainless) 1/4-28 SAE-LT 90° 3/8 in 3/4 in 13/64 in (shank) Alemite data sheets Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1644-B 1/8 PTF straight 7/16 in 9/16 in 15/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1610-BL 1/8 PTF straight 7/16 in 11/16 in 19/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1607-B 1/8 PTF straight 7/16 in 1-1/4 in 25/32 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1669-B 1/8 PTF straight 7/16 in 1-3/4 in 1-17/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1618-B 1/8 PTF straight 1/2 in 1 in 9/32 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1958 1/8 PTF straight 7/16 in 31/32 in 1/4 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1611-B 1/8 PTF 30° 7/16 in 29/32 in 19/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1688-B 1/8 PTF 45° 7/16 in 57/64 in 19/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1620-B 1/8 PTF 45° 7/16 in 1-1/8 in 13/32 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1612-B 1/8 PTF 65° 7/16 in 27/32 in 19/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1613-B 1/8 PTF 90° 7/16 in 27/32 in 19/64 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1606-B 1/8 PTF 90° 7/16 in 1-13/16 in 1-1/4 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1961-S (stainless) 1/8 PTF straight 7/16 in 3/4 in 5/16 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1921-S (stainless) 1/8 PTF 30° 7/16 in 1-1/4 in 11/32 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1922-S (stainless) 1/8 PTF 67.5° 7/16 in 61/64 in 11/32 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread Alemite, 1/8 PTF (sheet labels 'SAE SPL') 1923-S (stainless) 1/8 PTF 90° 7/16 in 7/8 in 11/32 in (shank) Alemite data sheets; 1/8 PTF is a tapered pipe thread McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT straight 5/16 in 35/64 in 7/64 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT straight 5/16 in 11/16 in 13/64 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT straight 5/16 in 31/32 in 13/64 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT straight 5/16 in 1-1/8 in 13/64 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT straight 5/16 in 1-5/8 in 1/4 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) 303 stainless 1/4-28 SAE-LT straight 5/16 in 17/32 in 7/64 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) 303 stainless 1/4-28 SAE-LT straight 9/32 in 19/32 in 7/32 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT 90° 3/8 in 3/4 in 5/32 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT 90° 3/8 in 51/64 in 5/16 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT 65° 3/8 in 49/64 in 13/64 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT 45° 3/8 in 13/16 in 5/32 in (thread length) category table as printed McMaster-Carr, 1/4-28 SAE-LT (as printed) zinc-plated steel 1/4-28 SAE-LT 45° 3/8 in 63/64 in 5/16 in (thread length) category table as printed DIN 71412 form A, straight (AFT / Kipp K1132, mm) M6x1 M6x1 A, 0° 7 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form A, straight (AFT / Kipp K1132, mm) M8x1 M8x1 A, 0° 9 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form A, straight (AFT / Kipp K1132, mm) M8x1.25 M8x1.25 A, 0° 9 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form A, straight (AFT / Kipp K1132, mm) M10x1 M10x1 A, 0° 11 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form A, straight (AFT / Kipp K1132, mm) M10x1.5 M10x1.5 A, 0° 11 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form A, straight (AFT / Kipp K1132, mm) R1/8 R1/8 A, 0° 11 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form A, straight (AFT / Kipp K1132, mm) R1/4 R1/4 A, 0° 14 mm (SW) L1 16 mm D 6 mm letters as printed on the sheet, not defined there DIN 71412 form B, 45° (AFT / Kipp K1132, mm) M6x1 M6x1 B, 45° 9 mm (SW) L max 23 mm L1 5.5 mm; A 10.5 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form B, 45° (AFT / Kipp K1132, mm) M8x1 M8x1 B, 45° 9 mm (SW) L max 23 mm L1 5.5 mm; A 10.5 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form B, 45° (AFT / Kipp K1132, mm) M8x1.25 M8x1.25 B, 45° 9 mm (SW) L max 23 mm L1 5.5 mm; A 10.5 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form B, 45° (AFT / Kipp K1132, mm) M10x1 M10x1 B, 45° 11 mm (SW) L max 23 mm L1 5.5 mm; A 11.5 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form B, 45° (AFT / Kipp K1132, mm) M10x1.5 M10x1.5 B, 45° 11 mm (SW) L max 23 mm L1 5.5 mm; A 11.5 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form B, 45° (AFT / Kipp K1132, mm) R1/8 R1/8 B, 45° 11 mm (SW) L max 23 mm L1 5.5 mm; A 11.5 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form B, 45° (AFT / Kipp K1132, mm) R1/4 R1/4 B, 45° 14 mm (SW) L max 23 mm L1 5.5 mm; A 12 mm letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11 DIN 71412 form C, 90° (Bollhoff, mm) M6x1 M6x1 C, 90° 9 mm (s) 14.3 mm (l) — Bollhoff steel 5.8 zinc, conical thread DIN 71412 form C, 90° (Bollhoff, mm) M8x1 M8x1 C, 90° 9 mm (s) 14.3 mm (l) — Bollhoff steel 5.8 zinc, conical thread DIN 71412 form C, 90° (Bollhoff, mm) M10x1 M10x1 C, 90° 11 mm (s) 15.3 mm (l) — Bollhoff steel 5.8 zinc, conical thread Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Alemite: 1/4-28 taper (SAE-LT) hydraulic grease fittings: 1641-B, 1652-B, 1680-B, 1698-B, 3014-B straight, 1637-B1 45 deg, 3010-B1 65 deg, 1911-B1 90 deg: hex, overall length, shank length — web — Maker data sheet; numbers only — https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1641-B-Straight-Hydraulic-One-Quarter-Inch-Twenty-Eight-Thread-Grease-Fitting.pdf - Alemite: 1/8 PTF hydraulic grease fittings (labelled SAE SPL on the sheet): straight, 30, 45, 65, 90 deg: hex, overall length, shank length — web — Maker data sheet; numbers only — https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1688-B-Hydraulics-Forty-Five-Degree-Angle-One-Eighth-Inch-Male-PTF-Grease-Fitting.pdf - Alemite: Stainless steel grease fittings 1966-S, 1968-S, 1969-S (1/4-28 taper), 1961-S, 1921-S, 1922-S, 1923-S (1/8 PTF): hex, overall length, shank length — web — Maker data sheet; numbers only — https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1961S-StainlessSteel-Straight-Fitting-Grease-Zerk-Hydraulic-Corrosion-Resistant.pdf - McMaster-Carr: Grease fittings, 1/4-28 SAE-LT (hex, overall and thread length per fitting) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/plugs/thread-type~sae-lt - AFT / Kipp K1132: Grease nipples, conical head, DIN 71412 style A, straight: M6x1, M8x1, M8x1.25, M10x1, M10x1.5, R1/8, R1/4: D, L1, SW — web — Maker data sheet; numbers only. Letters are not defined on the sheet — https://www.aftfasteners.com/content/K1132-A-Datasheet-18495-Grease-nipples-conical-head-DIN-71412-style-A-straight-enUS.pdf - AFT / Kipp K1132: Grease nipples, conical head, DIN 71412 style B, 45 deg: A, thread, L max, L1, SW — web — Maker data sheet; numbers only. Letters are not defined on the sheet — https://www.aftfasteners.com/content/K1132-B-Datasheet-18496-Grease-nipples-conical-head-DIN-71412-style-B-45-hexagonal-enUS.pdf - Bollhoff: DIN 71412 C conical grease nipple (form C, 90 deg head position), steel 5.8 zinc-plated: thread, s, pitch, l, M6, M8, M10 — web — Maker data sheet; numbers only — https://eshop-tr.boellhoff.com/out/media/pdf/DIN_71412_C_Stahl_5.8_gv_M___en.pdf - Wuerth: Cone grease nipple form B (45 deg) DIN 71412, zinc-plated, M10x1: thread length 5.5, wrench size 11, overall length 25 — web — Maker shop page; numbers only — https://eshop.wuerth.dk/Cone-grease-nipple-shape-B-angled-shape-45-DIN-71412-shape-B-zinc-plated-steel-with-hexagon-NPL-DIN71412-B-H2-A3F-WS11-HEX-M10X1/0986592.sku/en/US/DKK No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=grease-fittings-sae-j534-din-71412