HIWIN EG low-profile linear guideway: EGR15 to EGR35 rail and EGH15 to EGH30 SA / CA block dimensions (width, height, hole pitch, mounting holes) — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/hiwin-eg-linear-guideway-egr-egh-15-30/ (sheet CC BY 4.0) Basis: HIWIN EG Series 2025 catalog tables (one document, two extractions); the cells that merge between SA and CA rows are left out Catalog version: 2026-10-20 Sizes: see table below - HIWIN EG is the low-profile ball-type guideway: EGR rail, EGH square block in a short (SA) and long (CA) body, EGW flange blocks (not read). Dimension letters as in HIWIN's catalog: W / WR width, H / HR height (H from the rail bottom to the block top), B across and C along the block holes, L1 body length and L overall length, M x l thread and depth, T hole depth, D x h x d rail counterbore, P hole pitch, E end distance. - Source and its limits: all numbers are from HIWIN's EG Series 2025 catalog as hosted by Motion Industries, read in two extractions that agree. It is a single document, and its table layout merges cells between the SA and CA rows, so only what is unambiguous is shown: the SA block rows in full, and for the CA blocks only the body length L1 and overall length L (the printed 'H' of the CA rows, 26 / 32 / 35 / 40 mm, is the C hole spacing, which is why a CA row's H is not shown). The rail data is in two tables: EGR_T (tapped from below, S x thread depth h) for sizes 15 to 35, and EGR_U ('large mounting hole, rail mounting from top') for which only sizes 15 and 30 had D, h, d printed in the text read; the EGH block tables also list the standard rail bolts M3 x 16 (15), M5 x 16 (20), M6 x 20 (25) and M6 x 25 (30), which belong to the standard-counterbore rail EGR_R whose D, h and d were not printed in the text read. (The M3 x 16 and M6 x 25 for EG size 15 and 30 differ from the M4 x 16 and M8 x 25 of the large-hole EGR_U rail.) - End distance: E = 20 mm standard on all rails; for cut rails E should not exceed half the pitch (30 mm for 60 mm pitch, 40 mm for 80 mm; derived from that rule as the catalog states it). Standard-rail E tolerance +/-0.5 mm. - Numbers only, no CAD files: the rail and block cross-sections are not dimensioned in the catalog. For STEP use HIWIN's CAD configurator (linked under sources). - Left out: EGW flange blocks, EGH 35, EGR20 / 25 large-hole rails and the EG standard-counterbore D, h, d (not legible), moments, load ratings and weights, the QE series. part width W / WR, mm height H / HR, mm length L (block), mm block holes B / rail pitch P, mm thread / bolt rail counterbore D x h, through d, mm / thread depth h rail end distance E / other block dimensions EGR15T rail (tapped from below) 15 12.5 rail length: any P 60 tapped M5 x 0.8 thread depth h 7 E 20 standard EGR20T rail (tapped from below) 20 15.5 rail length: any P 60 tapped M6 x 1 thread depth h 9 E 20 standard EGR25T rail (tapped from below) 23 18 rail length: any P 60 tapped M6 x 1 thread depth h 10 E 20 standard EGR30T rail (tapped from below) 28 23 rail length: any P 80 tapped M8 x 1.25 thread depth h 14 E 20 standard EGR35T rail (tapped from below) 34 27.5 rail length: any P 80 tapped M8 x 1.25 thread depth h 17 E 20 standard EGR15U rail (large counterbore, from above) 15 12.5 rail length: any P 60 rail bolt M4 x 16 D 7.5 x h 5.3, d 4.5 E 20 standard EGR30U rail (large counterbore, from above) 28 23 rail length: any P 80 rail bolt M8 x 25 D 14 x h 12, d 9 E 20 standard EGR15R rail (standard counterbore, from above), bolt only — — rail length: any — rail bolt M3 x 16 counterbore D, h, d not read — EGR20R rail (standard counterbore, from above), bolt only — — rail length: any — rail bolt M5 x 16 counterbore D, h, d not read — EGR25R rail (standard counterbore, from above), bolt only — — rail length: any — rail bolt M6 x 20 counterbore D, h, d not read — EGR30R rail (standard counterbore, from above), bolt only — — rail length: any — rail bolt M6 x 25 counterbore D, h, d not read — EGH15SA block (short, square) 34 24 40.1 B 26 M4 x 6 (blind, depth l) T 6 H1 4.5, N 9.5, B1 4, L1 23.1, K1 14.8, K2 3.5, G 5.7, H2 5.5, H3 6 EGH20SA block (short, square) 42 28 50 B 32 M5 x 7 (blind, depth l) T 7.5 H1 6, N 11, B1 5, L1 29, K1 18.75, K2 4.15, G 12, H2 6, H3 6 EGH25SA block (short, square) 48 33 59.1 B 35 M6 x 9 (blind, depth l) T 8 H1 7, N 12.5, B1 6.5, L1 35.5, K1 21.9, K2 4.55, G 12, H2 8, H3 8 EGH30SA block (short, square) 60 42 69.5 B 40 M8 x 12 (blind, depth l) T 9 H1 10, N 16, B1 10, L1 41.5, K1 26.75, K2 6, G 12, H2 8, H3 9 EGH15CA block (long, square) as the SA block (not printed separately) as SA (the printed CA cell is the C spacing, not H) 56.8 B as SA as SA — L1 39.8 (body length) EGH20CA block (long, square) as the SA block (not printed separately) as SA (the printed CA cell is the C spacing, not H) 69.1 B as SA as SA — L1 48.1 (body length) EGH25CA block (long, square) as the SA block (not printed separately) as SA (the printed CA cell is the C spacing, not H) 82.6 B as SA as SA — L1 59 (body length) EGH30CA block (long, square) as the SA block (not printed separately) as SA (the printed CA cell is the C spacing, not H) 98.1 B as SA as SA — L1 70.1 (body length) Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - HIWIN (EG Series 2025, hosted by Motion Industries): EG series low-profile guideway: EGH SA / CA block table and EGR rail tables — web — Publisher's page; dimensions are facts — https://s3.amazonaws.com/www.motionusa.com/hiwin/2025/EG Series_2025.pdf - HIWIN: EG series rail CAD (HIWIN's own CAD configurator, STEP download; check HIWIN's terms) — STEP, web — HIWIN site terms [verify license at link] — https://motioncontrolsystems.hiwin.com/en-us/configurator/eg-series-rail 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=hiwin-eg-linear-guideway-egr-egh-15-30