Same grade as body for matched thermal expansion at weld
Seal Type
PU U-cup rod seal + NBR O-ring piston seal
Rated -30°C to +100°C
Certifications
ISO 9001:2015 + EN 10204 3.1 on request
CE component documentation available for OEM programs
32mm bore KWB cap-end clevis cylinder — cap boss dimensions, pin bore location, and rod thread reference
The 32mm bore KWB-series double-acting hydraulic cylinder with cap end clevis is a metric welded cylinder featuring an integral transverse pin bore (ØJ 16.2mm) machined through the cap end mounting boss (ØK 30mm, L 35mm), providing a ready-made pin-mount cap end for direct connection to OEM machine frames without requiring fabrication of a separate cap-end clevis bracket. The rod end retains a metric threaded interface (M16×1.5) sized for standard ISO 6982 spherical rod-eye fittings, allowing the OEM to choose the rod-end fitting that matches the specific motion profile of the application. Manufactured by Ever-Power Huachang under ISO 9001:2015 certification with ISO 6020-2 mounting reference dimensions — dimensionally compatible with Bosch Rexroth MP3 / MP5, Parker style C, and Bucher rear clevis pin-mount metric cylinders for equivalent bore size; standard OEM supply with 20 to 25 business day lead time.
Key Technical Facts
✦ Bore × Rod: 32mm bore (Ø32 mm) × 20mm rod — OD 42mm, BSP G1/4″ port, working pressure 16 MPa (160 bar / 2,320 PSI)
✦ Stroke range: 50mm to 500mm — 8 standard sizes
✦ Cap end pin clevis: Integral Ø16.2mm pin bore through Ø30mm mounting boss, L 35mm — ready for ISO 8675 standard clevis pin
✦ Rod end: M16×1.5 metric thread for ISO 6982 spherical rod-eye / DIN 648 rod-end fittings — OEM selects fitting type
32mm Bore KWB Cap End Clevis Cylinder — 32Mm Metric Cap Clevis Cylinder For Industrial Automation
Between fully bare cylinder bodies (which require OEM end-fitting fabrication at both ends) and fully finished pin-mount cylinders (with mounting style fixed at both ends), there is a middle position that suits a large share of European OEM hydraulic equipment design: the cap end fixed as a standard pin clevis, the rod end left as a threaded interface for OEM-chosen rod-end fitting. The 32mm bore KWB-series cylinder occupies this middle position, with cap-end pin bore Ø16.2mm, integral mounting boss, and metric rod thread (M16×1.5) sized for standard ISO 6982 spherical rod-eye fittings.
This cylinder serves as a double-acting hydraulic cylinders for OEM equipment requiring standard pin-mount cap installation. Applications include machine tool slide positioning, automated assembly stations, packaging machinery.
What "Cap End Clevis" Means — KWB Pin Mount Concept
The KWB cap end ships with an integral pin clevis built directly into the cap end of the cylinder body. A mounting boss of Ø30mm diameter and 35mm length is welded to the cap end face, with a transverse pin bore (ØJ 16.2mm) drilled through the boss perpendicular to the cylinder centerline. This forms a one-piece pin clevis — no separate bracket needed at the cap end. The OEM installs the cylinder by inserting an ISO 8675 standard clevis pin (Ø16 nominal diameter) through this bore and through two clevis ears on the equipment frame.
* KWB position: standard cap mount with OEM-flexible rod end interface
Feature
KWA Without Ends
KWB Cap End Clevis (this series)
KWC Both Tube Ends
Cap end
Bare flat-machined face
Integral pin clevis (factory-installed)
Pin clevis (same as KWB)
Rod end
Threaded interface
Threaded interface (same as KWA)
Pin clevis (factory-installed)
OEM cap work
Fabricate bracket & weld
None — install with clevis pin
None — install with clevis pin
OEM rod work
Choose & install fitting
Choose & install fitting (same as KWA)
None — install with clevis pin
Flexibility
Maximum
Cap fixed, rod flexible
Both ends fixed
Best for
Custom OEM design
Standard cap + custom rod
Standard equipment maintenance
Cap End Clevis Dimensions Reference — ISO 6020-2
The cap end clevis dimensions on this 32mm bore KWB cylinder follow ISO 6020-2 reference. The full KWB series uses 5 standard pin bore sizes across all bore configurations — see the complete cross-reference below:
* Pin shear capacity calculated at τ = 80 MPa allowable shear stress for standard S355 pin in single shear configuration. Double shear capacity = 2x single shear. Apply safety factor ≥ 3.0 against cylinder thrust at maximum working pressure.
Bore × Rod
ØJ Pin Bore
ØK Boss Diameter
L Boss Length
S Pin-to-Body
Pin Size / Shear Capacity*
25 × 16
Ø12.1 mm
25 mm
25 mm
31 mm
Ø12 pin / 9.2 kN single shear
32 × 20
Ø16.2 mm
30 mm
35 mm
51 mm
Ø16 pin / 16.5 kN single shear
40 × 25
Ø20.25 mm
35 mm
40 mm
65 mm
Ø20 pin / 25.8 kN single shear
50 × 30
Ø25.25 mm
40 mm
45 mm
85 mm
Ø25 pin / 40.3 kN single shear
60 × 30 / 60 × 35
Ø25.25 mm
40 mm
45 mm
83 mm
Ø25 pin / 40.3 kN single shear
70 × 40
Ø30.25 mm
50 mm
55 mm
82 mm
Ø30 pin / 58.0 kN single shear
80 × 40
Ø30.25 mm
50 mm
55 mm
70 mm
Ø30 pin / 58.0 kN single shear
100 × 50
Ø30.25 mm
60 mm
70 mm
75 mm
Ø30 pin / 58.0 kN single shear
Cap Pin Shear Load Calculation Guide
Before installing this KWB cylinder, the OEM engineer must verify that the planned cap clevis pin has adequate shear capacity to handle the cylinder thrust at maximum working pressure. The calculation requires a clear understanding of pin material, shear configuration, and required safety factor.
Pin Shear Load Formula: F = τ × A × n
F = Allowable pin load (kN) τ = Pin material allowable shear stress (MPa) — S355 = 80 MPa · Grade 10.9 = 115 MPa · Grade 12.9 = 145 MPa A = Pin cross-section area = π × J² / 4 (mm²) n = Number of shear planes (1 single shear / 2 double shear)
Pin safety factor recommendation: For 32mm bore KWB at full 16 MPa working pressure, the single-shear S355 pin configuration provides a safety factor of 1.28 — below the recommended minimum of 3.0. OEM should use double-shear mounting configuration (two parallel equipment frame ears with pin passing through both), upgrade to grade 10.9 or 12.9 high-strength pin, or limit operating pressure to ensure adequate pin safety factor.
Rod End Fitting Selection Guide
The rod end of the KWB cylinder is supplied with a metric threaded interface (M16×1.5), allowing the OEM to choose the rod-end fitting that matches the application motion profile. Three standard options cover most industrial applications:
Option A — Spherical Rod Eye (Most Common, ~70% of OEM Applications)
Standard ISO 6982 / DIN 648 spherical rod-eye with internal M16×1.5 thread. Provides ±5° angular self-alignment under load — the most forgiving choice when assembly alignment tolerances are moderate. Most common rod-end fitting in European industrial OEM applications. Available from SKF, INA, ASK, Durbal, and most European spherical bearing manufacturers.
Option B — Double Clevis Yoke
Female clevis yoke with internal M16×1.5 thread, paired with separate clevis pin for two-plane pivoting. Use when rod-end load arc requires bidirectional pivot (scissor lift mechanisms, complex linkages). Lower angular travel than spherical bearings (typically ±10°) but higher load rating.
Option C — Fixed Pin Coupling
Threaded coupling block with single transverse pin bore for fixed connection. Use when the rod-end is rigidly attached with no relative motion between rod and mating part. Lowest cost and highest load rating, but requires precise alignment between cylinder centerline and rod-end mounting point.
* Column load reference values calculated with rod 20mm at pinned-pinned end condition (K=1). Apply safety factor ≥ 3.5. Pressure derating above 600mm stroke is recommended best practice.
Stroke
Total Length (E + S)
Column Load (ref)
Recommended Working Pressure
50 mm
101 mm
~1519.8 kN
16 MPa
100 mm
151 mm
~679.9 kN
16 MPa
150 mm
201 mm
~383.7 kN
16 MPa
200 mm
251 mm
~246.1 kN
16 MPa
250 mm
301 mm
~171.1 kN
16 MPa
300 mm
351 mm
~125.8 kN
16 MPa
400 mm
451 mm
~76.2 kN
16 MPa
500 mm
551 mm
~51.1 kN
16 MPa
Cap pin shear safety factor warning: The cap clevis pin bore ØJ is fixed at the factory and cannot be enlarged in the field. OEM must verify the planned cap pin material and shear configuration provide minimum 3.0 safety factor against cylinder thrust at maximum working pressure. Standard S355 pins typically require double-shear mounting; smaller pins under heavy load may need grade 10.9 / 12.9 upgrade.
Cap pin bore vs equipment frame ear fit: Equipment frame ears that accept the cap clevis pin must be machined to H7 tolerance for the standard ISO 8675 pin diameter. Loose pin fit (oversized ear bore) introduces impact clearance under cyclic loading — this is the primary cause of premature cap boss damage in pin-mount cylinder installations. Verify ear bore H7 tolerance before installation.
Rod thread vs rod-end fitting compatibility: The KWB rod end thread is M16×1.5, sized for ISO 6982 spherical rod-eye and DIN 648 series rod-end accessories. Different rod-end fitting manufacturers may use slightly different thread length or tolerance — verify thread engagement is at least 1.5 times rod diameter (30mm minimum) for full load transfer. Do not assume all metric threads of nominal size are interchangeable.
S distance impact on equipment design: The cap pin axis is S = 51mm from the cylinder body end face. Equipment frame design must include this S distance when computing total cap-pin-to-rod-end attachment-point geometry. Many OEM design errors occur when the frame is laid out based on cylinder body length (E dimension) without adding S — the cap pin position will be wrong by exactly 51mm.
Cap pin clevis use limitation: The cap pin clevis is intended for angular compensation (typically ±5°) to accommodate small motions during stroke. It is NOT designed for continuous rotation around the pin axis. The plain bearing interface (no internal ball bearing) has limited friction life under continuous rotation. Applications requiring continuous rotation should specify a cylinder with integral spherical bearing in the cap clevis.
Construction and Material Specification
Cap boss material is identical to the cylinder body material (S355J2) to ensure consistent weld behaviour and matched thermal expansion across the joint. The transverse pin bore is drilled, reamed, and finish-honed in a single setup on a CNC machining center to maintain concentricity with the cylinder centerline within 0.1mm. Boss perpendicularity is verified on a coordinate measurement machine for first-article samples per production order.
Manufacturing Process: How Every KWB Cylinder Is Built
Production steps for KWB cap-end clevis hydraulic cylinder — cap boss welding, pin bore machining, seal assembly, pressure testing
Each 32mm bore KWB cylinder passes through: incoming inspection of cold-drawn seamless steel tube, CNC machining of body and end caps, precision honing to Ra below 0.4 microns, cap boss welding to cylinder body with full-penetration weld at ISO 5817 Class B quality, magnetic particle inspection of cap boss weld, drilling and reaming of cap pin bore to H7 tolerance, hard chrome plating of rod, rod thread rolling, seal assembly, 100% pressure test at 24 MPa (1.5x rated). Review our agricultural hydraulic cylinders for full quality documentation.
OEM Integration Guide: Installing a Cap-End Clevis Cylinder
1
Verify all cap and rod dimensions:Cross-check bore 32mm, rod 20mm, cap pin bore ØJ 16.2mm, boss diameter ØK 30mm, boss length L 35mm, pin-to-body S 51mm, and rod thread M16×1.5 against equipment design. Any one dimension wrong will cause installation problems.
2
Pin shear and bearing pressure analysis:Beyond shear safety factor, verify the cap boss has adequate bearing area for the contact pressure. Bearing pressure = thrust / (J × L_engagement). For S355 boss, allowable bearing pressure is 200 MPa. 32mm bore generates 12.9 kN thrust — verify bearing pressure stays within limit.
3
Frame bracket design with H7/h6 fit:Design equipment frame ears to accept the planned clevis pin in H7 tolerance bore. Pin should be h6 tolerance (e.g. Ø25 h6 for KWB-25 family). Tight fit eliminates impact clearance under reversing loads.
4
Rod-end fitting procurement:Confirm rod-end fitting thread matches M16×1.5 and that the fitting's rated load exceeds the cylinder pull force (υ7.8 kN at 16 MPa). Select from ISO 6982 spherical rod-eye, DIN 648 series, or equivalent.
5
Cylinder receipt inspection:Verify cap pin bore dimension with calliper (should be within H7 tolerance, e.g. Ø25.25 H7 = +0.021 / 0). Inspect rod thread for damage. Document cap boss weld appearance with photos.
6
Hydraulic system flush before connection:If the hydraulic system was previously used or contains stored fluid, flush with clean fluid to ISO 4406 18/16/13 cleanliness or better before connecting the KWB. Contamination accelerates rod seal wear in metric cylinders.
7
Mechanical installation in sequence:Install cylinder cap clevis first via clevis pin. Verify clevis pin retainers are fully seated. Thread rod-end fitting onto rod. Connect rod-end fitting to mating part. Tighten in sequence; do not load until full mechanical assembly is verified.
8
Commissioning with pressure ramping:Initial commissioning at 50% pressure (8 MPa) for 5 cycles, verify smooth motion and no leaks. Increase to 75% (12 MPa) for 5 cycles. Increase to 100% (16 MPa) for final 5 cycles. Document any anomalies; investigate before placing the equipment in production service.
Industry Standard Compliance
Standard
Scope
Application to KWB
ISO 9001:2015
Quality Management System
Material traceability, hold-point inspections, individual pressure test records retained 5 years
ISO 6020-2
Cap Clevis Mounting Reference
Cap boss diameter (ØK), pin bore (ØJ), boss length (L), and S distance follow ISO 6020-2 preferred series
ISO 5817
Welding Quality Levels
Class B weld quality on cap boss-to-body weld; 100% visual inspection, MT on every cylinder
EN 10204 3.1
Material Inspection Certificates
Available on request for OEM programs requiring material traceability
Manufacturing Capability: Ever-Power Huachang
Ever-Power Huachang hydraulic cylinder manufacturing facility, Hangzhou Lin’an, China
The integral cap clevis on KWB cylinders is formed by welding a machined S355J2 mounting boss to the cap-end face of the cylinder body, then drilling the pin bore through the boss after welding to ensure perpendicularity to the cylinder centerline. Welding sequence and heat input are controlled to prevent thermal distortion of the cylinder body bore. Each cap boss weld undergoes 100% visual inspection and magnetic particle inspection on a sampling basis per production batch. Review our quality control for production quality documentation.
Frequently Asked Questions: 32mm Bore KWB Cap End Clevis Cylinder
What is the difference between KWA, KWB, and KWC cylinder series?
KWA cylinders ship as bare bodies — flat-machined cap end and threaded rod end, no mounting attachments. OEM fabricates both ends. KWB cylinders (this series) ship with cap end pin clevis pre-installed and rod end as threaded interface — OEM only fabricates or selects rod-end fitting. KWC cylinders ship with both cap end and rod end pre-fitted as pin clevises (tube ends both sides) — OEM installs cylinder directly with two clevis pins. KWA gives maximum design flexibility; KWB gives standard cap mount with rod flexibility; KWC gives ready-to-install pin mount at both ends.
Why would I choose KWB over the fully bare KWA series?
Choose KWB over KWA when the OEM equipment design has standardised on pin clevis cap mounting. Reasons: (1) save OEM fabrication labour at the cap end — no need to weld a clevis bracket; (2) cap clevis dimensions match ISO 6020-2 reference, supporting bracket interchangeability; (3) cap boss perpendicularity is held within 0.5 degree at the factory, harder to achieve in OEM-fabricated brackets; (4) faster OEM equipment assembly — cap end is install-ready out of the box.
Why would I choose KWB over the fully finished KWC series?
Choose KWB over KWC when the rod-end interface varies across the OEM equipment product line. KWC has both cap and rod ends fixed as pin clevises — less flexible if different equipment models use different rod-end fittings (some spherical bearings, others double yokes, etc.). KWB keeps the rod end as a metric thread, allowing the OEM to specify different rod-end fittings per equipment model from the same cylinder body inventory. This reduces inventory complexity for multi-product OEM lines.
What applications is the 32mm bore KWB best suited for?
The 32mm bore KWB cap-end clevis cylinder is suited to machine tool slide positioning, automated assembly stations, packaging machinery. At 16 MPa working pressure the cylinder generates 12.9 kN push force from the cap end. The cap clevis configuration is preferred in applications where: equipment frame ears are factory-fitted to accept a clevis pin, the cylinder must accommodate small angular motion during stroke, and the OEM wants to standardise on a single cap mount style across equipment variants while allowing rod-end fitting selection per application.
Is the KWB rod thread compatible with standard ISO 6982 spherical rod-eyes?
Yes. The KWB rod thread (M16×1.5) is a standard metric thread per ISO 261, sized for direct fit of ISO 6982 spherical rod-eye fittings and DIN 648 series rod-end accessories. Common compatible brands include SKF, INA, ASK, Durbal, and most European spherical bearing rod-end manufacturers. Confirm the specific rod-end fitting's thread length and torque specification before installation.
What is the maximum stroke length I can order for this bore size?
Standard maximum stroke for the 32mm bore KWB is 500mm in 50mm or 100mm increments. Strokes longer than the catalog maximum are available on request with engineering review for column load (buckling) and shipping considerations. Longer strokes typically require a larger rod diameter to maintain column load safety factor — review the Pin Shear Load Calculation Guide and Rod Diameter information on this page before specifying long-stroke configurations.
What hydraulic fluid is recommended for KWB cylinders?
Standard mineral hydraulic oil meeting ISO VG 32 or ISO VG 46 viscosity grade is recommended for normal operating conditions. The NBR / PU seal compounds are compatible with mineral oils, water-glycol fluids (with appropriate seal compound — confirm at order), and most synthetic ester (HEES) biodegradable fluids. For HFB / HFC / HFD high-water or phosphate ester fluids, alternative seal compounds are required — specify fluid type at order placement.
Can I get EN 10204 3.1 material certificates with my KWB order?
Yes. EN 10204 3.1 material inspection certificates for body steel, rod material, and cap boss material are available on request for OEM programs. Specify at order placement — material certificate requests add 3 to 5 business days for documentation preparation. For OEM programs requiring CE marking technical file documentation, full component-level material traceability and individual cylinder pressure test records are also available.
How do I verify the cap clevis dimensions before installation?
After receipt, verify with a calliper: cap pin bore ØJ (should be within H7 tolerance), cap boss outside diameter ØK (h9 tolerance), boss length L (±0.5mm typical), and S distance from pin axis to body face. Slide a go-gauge clevis pin (J nominal diameter) through the bore to confirm smooth fit without binding. Document all critical dimensions on first-article samples from each production order for OEM quality records.
What lead time and minimum order quantity apply to KWB orders?
Standard KWB configurations with catalog bore/rod/stroke combinations ship within 20 to 25 business days from order confirmation. Minimum order quantity for standard configurations is 1 piece for repair applications, increasing to 50 to 100 pieces for OEM program pricing. Custom variations (alternative pin bore size, alternative rod thread, custom S dimension) require 100-piece MOQ and add 5 to 10 business days to standard lead time.
OEM / Pin Mount Replacement Program
Need a 32mm KWB cap end clevis cylinder for your OEM equipment?
Replacing a Bosch Rexroth MP3 / MP5, Parker style C, or Bucher rear clevis cylinder? Provide the original part number from the data plate — we will cross-reference to the equivalent KWB configuration with dimensional match on ØJ, ØK, L, and S.
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