描述
Series 6
1-3/8″ 21-Spline (European)
30.2×92 mm Cross Kit
Interfering Clamp Bolt
High Vibration Rated
CE Certified
MOQ 1 pc — LGPD Ready
Series 6 Z21 Clamp Bolt PTO Yoke — Compatible Shaft Series
| Compatible Shaft | Series Type | Cross Kit | HP Range |
|---|---|---|---|
| T6 | T Series (Triangular) | 30.2×92 mm | 45–70 hp |
| L6 | L Series (Lemon) | 30.2×92 mm | 45–70 hp |
| S6 | S Series (Star) | 30.2×92 mm | 45–70 hp |
| G6 | G Series (Wide Angle CV) | 30.2×92 mm | 45–70 hp |
Overview
Product Description
Series 6 Clamp Bolt Splined Yoke — 1-3/8″ 21-Spline (Z21) is the interfering clamp bolt version for European tractors with the 21-spline PTO stub interface. The 21-spline bore is identified by counting 21 ridges inside the bore — both Z6 and Z21 share the same outer diameter (1-3/8″/34.9 mm), so spline count is the definitive identification method.
The 30.2×92 mm cross-kit seat is identical to the Series 6 Z6 clamp bolt version — the cross kit is fully interchangeable between Z6 and Z21 at Series 6. The difference is only in the spline bore. For tractors with Z21 stubs (SAME, Lamborghini, some older Deutz-Fahr models), the Z21 bore is the only correct specification — using a Z6 bore on a Z21 stub produces incomplete spline engagement.
Series 6 Z21 clamp bolt cross-references to the Italian AB6/A6 designation in Bondioli & Pavesi catalogs, which is the standard reference when sourcing European OEM replacement parts. For stock orders and OEM supply, contact Ever-Power Drive Line.
Clamp Bolt Locking Mechanism — Installation Procedure
The interfering clamp bolt bites into the spline bore wall when tightened, creating a mechanically locked connection independent of any spring element.
Clean and Align
Clean the spline bore and PTO stub. Align the yoke spline bore with the stub splines. Slide the yoke fully onto the stub until it is completely seated — no gap between yoke face and stub shoulder.
Insert and Hand-Tighten Bolt
Insert the clamp bolt through the yoke clamp collar. Hand-tighten until the bolt contacts the spline bore wall. Do not use impact tools at this stage — the bolt must be guided in straight.
Torque to Specification
Use a calibrated torque wrench. Tighten to 25–30 Nm for Series 1–5; 35–45 Nm for Series 6–8. Inspect and retorque at first 10 hours, then every 50 hours in high-vibration duty.
⚠ Clamp Bolt vs Quick Release — Choose the Right Locking Type
Clamp bolt: Use when the yoke remains connected for the season — OEM factory-fit, high-vibration implements, applications where removal requires tools by design. Quick release: Use when daily connect/disconnect is required. The cross-kit and dimensional specifications are identical between both variants at Series 6.
Dimensional Drawing — A / B / C / D Reference
A = Overall length | B = Cross pin diameter | C = Yoke width | D = Bore diameter. Refer to the compatibility table above for exact mm values.
End-face view of the 1-3/8″ Z21 bore (21-spline). Count the splines to confirm specification before ordering.
Cross-Reference Part Numbers
| Brand / Standard | Part Number / Reference | Notes |
|---|---|---|
| Weasler (North American) | 103-2121 | Clamp bolt / interfering bolt, D suffix |
| Sparex / Eurocardan (European) | S.7512 | Interfering clamp bolt, Series 6 Z21 |
| Bondioli & Pavesi (Italian) | 6.05.22 | AB6/A6 catalog reference |
| Ever-Power Drive Line (This product) | EPG-YK-CB-6-Z21 | EPG Series 6 CB Z21 |
Spline Profile Reference
Left: Z6 (6-spline, 540 rpm) — Centre: Z21 (21-spline, European) — Right: Z20 (20-spline, 1,000 rpm)
Key Features
Interfering Clamp Bolt Lock
The bolt threads into the yoke clamp collar and bites into the spline bore wall when tightened, creating a mechanically interlocked connection. Unlike a spring-loaded push-pin, the clamp bolt connection does not depend on any spring element — there is no spring to fatigue, no collar to wear, and no retention pin to lose in field conditions.
High Vibration Resistance
The bolt-secured connection maintains its clamping force under sustained vibration loads that cycle a push-pin spring mechanism. Specified for rotary cutters, forage harvesters, and high-duty-cycle implements where vibration fatigue is a concern over 300+ hour operating seasons. Retorque inspection at 50-hour intervals ensures sustained clamping force.
1-3/8″ Z21 Spline Bore
European 21-spline interface for SAME, Lamborghini, and specific Deutz-Fahr tractor models. Induction-hardened spline bore for long-term engagement durability.
30.2×92 mm Cross-Kit Seat
Precision-machined cross-kit bearing cup bores hardened to accept 30 mm pin diameter needle-roller cross-kit cups. Cross kit (code 6.01) is shared with the Quick Release version at Series 6 — one part number covers both variants.
20CrMnTi Forged Steel Body
Drop-forged chromium-manganese-titanium alloy steel yoke body, normalised and induction-hardened at the bearing seat bores. Phosphate surface coating provides corrosion resistance in outdoor agricultural conditions. Clamp bolt collar is machined integral with the yoke body — no separate clamp ring to lose or misalign.
CE Certified — LGPD Ready
CE Declaration of Conformity and ISO 9001:2015 documentation included with every shipment. LGPD data handling compliance for Brazil import submissions. SGS third-party inspection available for contract orders.
Typical Applications
Series 6 CB Z21 — permanent-mount tractor-end connection for 45–70 hp implements
Large Round Baler — OEM Driveline
Series 6 clamp bolt is the European OEM standard tractor-end yoke on large round balers. Factory-fitted and specified as AB6/A6 in Italian catalog, it provides permanent connection through the full baling season.
Disc Mower-Conditioner — Implement End
Implement-end clamp bolt yoke on mower-conditioner drivelines where the shaft remains connected for extended working periods in 50–70 hp tractor applications.
High-Capacity Spreader — Continuous
Series 6 clamp bolt on twin-disc fertiliser spreader drives running continuous seasonal campaigns where push-pin spring fatigue is a maintenance concern.
Installation Steps
Verify Series and Spline
Confirm your PTO shaft is Series 6 (30.2×92 mm cross kit) and your tractor PTO stub is Z21 (1-3/8″ 21-spline). Count the splines to confirm.
Clean Stub and Bore
Remove all rust, debris, and old lubricant from both the PTO stub and the yoke spline bore. Clean mating surfaces ensure maximum contact area and correct bolt seating.
Slide and Seat Yoke
Align splines and push the yoke fully onto the stub until the yoke face contacts the stub shoulder. Full seating is essential before bolt tightening — a partially seated yoke will not lock correctly.
Torque the Clamp Bolt
Insert the clamp bolt and tighten with a calibrated torque wrench to 25–30 Nm (Series 1–5) or 35–45 Nm (Series 6–8). Do not use impact tools. Verify bolt is fully threaded before torquing.
Anchor Shield and Inspect
Connect the shaft safety shield chains to non-rotating points on tractor and implement. Inspect the bolt after the first 10 hours of operation and retorque to specification. Reinspect every 50 hours in high-vibration duty.
Frequently Asked Questions
- —Use Z21 when the tractor PTO stub has 21 splines (count the ridges inside the stub)
- —Z21 stubs are found on SAME, Lamborghini, and some older Deutz-Fahr tractors
- —Using Z6 on a Z21 stub (or vice versa) produces incomplete spline engagement — causing rapid wear
- —Yes — the 30.2×92 mm cross kit (code 6.01) is identical for both Z6 and Z21
- —One cross-kit part number covers Z6, Z21 clamp bolt, and quick release variants at this series
- —Only the yoke body differs between Z6 and Z21
- —Use clamp bolt for OEM factory-fit and seasonal-mount applications — it does not require daily disconnection
- —Use quick release for frequent daily implement changes
- —Clamp bolt eliminates push-pin spring fatigue in high-vibration and long-season applications
- —Same as Z6 at Series 6: 25–30 Nm (series 1–5) or 35–45 Nm (series 6–8)
- —The bore profile differs (21 vs 6 splines) but bolt torque specification is the same
- —Inspect and retorque at 50-hour intervals in high-vibration duty
- —Italian series: AB6D / A6D (Bondioli & Pavesi D-suffix for Z21)
- —Sparex references listed in the Cross-Reference table above
- —Interfering Bolt = Clamp Bolt in North American terminology
Customer Reviews
André F.
Rio Grande do Sul, Brazil — European Implement Importer
★★★★★
- Series 6 Z21 clamp bolt confirmed correct for our SAME tractor fleet — no engagement issues
- CE documentation accepted for import compliance
- Cross kit interchangeable with Z6 — simplifies our spare parts inventory
Lucia M.
Montevideo, Uruguay — Tractor Parts Dealer
★★★★★
- Series 6 Z21 CB stocked for European tractor service — consistent replacement for Italian OEM yokes
- AB series cross-reference matches exactly
- 9-day lead time from stock
Shipping and Order Information
MOQ
1 pc from stock
50 pcs custom / OEM
Lead Time
7–10 days (stock)
20–30 days (OEM)
Shipping
Sea / Air to Brazil
South America
Trade Terms
FOB Ningbo
CIF Santos available
认证
CE Certified
ISO 9001:2015
TS/16949
SGS InspectionLGPD Compliant
