Knowledge That Prevents Downtime
Practical knowledge for procurement and maintenance: identifying threads, looking up torque values, sizing linear guides. From the engineers who supply your parts.
Tools
Calculate instead of searching the catalog
Two tools that answer a sizing question directly. No sign-in, no download.
Thread identifier: measure, enter, identify
Enter the measured outer diameter, the pitch or thread count and the taper, and the tool narrows down the thread family and size.
L10 calculator: compute the service life directly
Enter the load rating and the load per runner block, choose the reference distance and rolling element: the calculator applies the DIN ISO 14728-1 formula live and converts to operating hours on request.
Connection Technology
Identifying and matching threads
Identify hydraulic threads: how to name every thread
Unknown thread? Three measurements settle it: diameter, pitch, taper. Measuring protocol, thread identifier and quick-match table for BSP, metric, NPT, JIC, ORFS.
Thread types in hydraulics: size charts for BSP, metric, NPT, JIC and ORFS
Hydraulic thread chart: major diameter, pitch and TPI per size for BSP, metric, NPT, JIC and ORFS, sealing principle per family, cross-reference by dash and tube OD.
ORFS fittings explained: the O-ring face seal
ORFS fittings explained: the O-ring face seal per ISO 8434-3, dimensions from -04 to -24 and when ORFS beats JIC as the vibration-proof choice.
Assembly and torque
Tightening torques for cutting-ring fittings: L and S series
Verified Nm tables for the male stud of the L and S series by size and sealing form. And why the swivel nut is assembled by turns, not torque.
Assembling a cutting-ring fitting correctly
Assembly guide for cutting-ring fittings: pre-assembly and final assembly step by step, turn counts per manufacturer and the most common mounting mistakes.
DIN 2353: understanding the LL, L and S series
The LL, L and S series to DIN 2353 and ISO 8434-1 in tables: tube OD, thread and rated pressure per size, and which series fits your operating pressure.
Selection and troubleshooting
Flare or Cutting Ring: Choosing the Right Tube Fitting
Flare or cutting ring compared: vibration, wall thickness, assembly effort, reusability, system pressure. When the 37° flare fits, and when the cutting ring.
Leaking hydraulic fitting: causes and remedies
Depressurize first, then read the leak by its sealing principle: cause table, a five-step diagnosis and when to replace instead of retighten.
Hydraulics
Monitoring and tooling
Hydraulic torque wrenches: choosing between hydraulic, pneumatic and manual
Hydraulic, pneumatic or manual: choose by torque, repeatability, access and bolt count. And when a hand torque wrench is all you need.
Filter clogging indicator on hydraulic filters: function and selection
How the clogging indicator works, which design fits where (differential pressure, back pressure, optical, electrical) and when to change the filter element.
Linear Motion
Selecting and sizing
How to size a linear guide: size, load rating, block count
Size linear guides correctly: pick the size from load ratings C and C0, then block format, count and preload. With a load-rating table and the full sequence.
Ball Rail or Roller Rail Guide: The Comparison for Practice
Ball rail or roller rail guide compared: load capacity, rigidity, speed and mounting. Why the roller is stiffer, and what that stiffness costs.
Calculating the service life of linear guides: formula, example, factors
How to calculate linear guide service life: the L10 formula per DIN ISO 14728-1, a worked example with real load ratings and a free L10 calculator.
Type codes and classes
Rexroth type code explained: decoding KWD, FNS, SNS and the R16 numbers
KWD-025-FNS-C1-N-1 decoded: read size, carriage form, preload and accuracy, understand the R16 part numbers and match the right runner block to your rail.
Preload on linear guides: choosing C0, C1, C2 and C3 correctly
How to choose preload on linear guides: the classes C0, C1, C2 and C3 compared, the trade-off of stiffness against service life, and the right pick for CNC.
Accuracy classes on linear guides: N, H, P, XP, SP and UP compared
Accuracy classes on linear guides: the five tolerance criteria, the classes N, H, P, XP, SP and UP, and the verified tolerance values from Bosch Rexroth.
Cutting, mounting and maintenance
Linear rail to length: planning the cut, edge distance T1 and hole pattern
Cut a linear rail correctly: calculate edge distance T1, plan pitch and hole pattern, configure your length. PTS cuts in-house from stocked 4000 mm bars.
Mounting a linear guide: alignment, tightening torques, reference edges
Mount a linear guide step by step: work from the reference edge, bolt from the center outward, verified Rexroth tightening torques per rail size as a table.
Lubricating linear guides: grease, intervals and relubrication in practice
Lubricate linear guides right: which grease fits, how often to relubricate and why modern Rexroth ball rails run up to 20,000 km without relubrication.