{"id":784,"date":"2026-09-24T02:01:51","date_gmt":"2026-09-24T02:01:51","guid":{"rendered":"https:\/\/drivelines.net\/product\/series-4-clamp-bolt-pto-yoke-1-3-8-6-spline-27x74-6-mm-cross\/"},"modified":"2026-09-24T02:01:51","modified_gmt":"2026-09-24T02:01:51","slug":"series-4-clamp-bolt-pto-yoke-1-3-8-6-spline-27x74-6-mm-cross","status":"publish","type":"product","link":"https:\/\/drivelines.net\/pt\/produto\/series-4-clamp-bolt-pto-yoke-1-3-8-6-spline-27x74-6-mm-cross\/","title":{"rendered":"Series 4 Clamp Bolt PTO Yoke \u2014 1-3\/8″ 6 Spline (27\u00d774.6 mm Cross)"},"content":{"rendered":"
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<\/div>\n

Series 4<\/p><\/div>\n

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<\/div>\n

1-3\/8″ 6-Spline (540 rpm)<\/p><\/div>\n

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<\/div>\n

27\u00d774.6 mm Cross Kit<\/p><\/div>\n

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<\/div>\n

Interfering Clamp Bolt<\/p><\/div>\n

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<\/div>\n

High Vibration Rated<\/p><\/div>\n

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<\/div>\n

CE Certified<\/p><\/div>\n

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<\/div>\n

MOQ 1 pc — LGPD Ready<\/p><\/div>\n<\/div>\n

Series 4 Z6 Clamp Bolt PTO Yoke — Compatible Shaft Series<\/h2>\n
\n\n\n\n\n\n\n\n
Compatible Shaft<\/th>\nSeries Type<\/th>\nCross Kit<\/th>\nHP Range<\/th>\n<\/tr>\n<\/thead>\n
T4<\/td>\nT Series (Triangular)<\/td>\n27\u00d774.6 mm<\/td>\n28\u201345 hp<\/td>\n<\/tr>\n
L4<\/td>\nL Series (Lemon)<\/td>\n27\u00d774.6 mm<\/td>\n28\u201345 hp<\/td>\n<\/tr>\n
G4<\/td>\nG Series (Wide Angle CV)<\/td>\n27\u00d774.6 mm<\/td>\n28\u201345 hp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Series 4<\/div>\n
Shaft Series<\/div>\n<\/div>\n
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27\u00d774.6<\/div>\n
Cross Kit mm<\/div>\n<\/div>\n
\n
6-Spline<\/div>\n
1-3\/8″<\/div>\n<\/div>\n
\n
27 mm<\/div>\n
Cross Pin Ø<\/div>\n<\/div>\n<\/div>\n
Series: 4<\/span>Spline: 1-3\/8″ Z6 (6-spline)<\/span>Cross: 27\u00d774.6 mm<\/span>Pin Ø: 27 mm<\/span>Lock: Interfering Clamp Bolt<\/span>Material: 20CrMnTi forged steel<\/span>Finish: Phosphate coat<\/span>Bore: Induction hardened<\/span>Compatible: T4 \/ L4 \/ G4<\/span><\/div>\n

Overview<\/h2>\n
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⚙ Series 4 — Cross kit 27\u00d774.6 mm, Pin Ø 27 mm<\/div>\n
🔗 Compatible: T4 \/ L4 \/ G4 drive shafts<\/div>\n
▲ 1-3\/8″ Z6 bore (6-spline) — 1-3\/8″ 6-Spline (540 rpm)<\/div>\n
🔧 Interfering clamp bolt — tool-secured, vibration-resistant, no spring element<\/div>\n
⚔ 20CrMnTi forged steel — induction-hardened bearing seat and spline bore<\/div>\n
🌎 CE certified — LGPD compliant, ships to Brazil<\/div>\n<\/div>\n

Product Description<\/h2>\n

Series 4 Clamp Bolt Splined Yoke is the bolt-secured version of the most widely used PTO yoke series in agricultural machinery. Where the Series 4 Quick Release is the standard for flexible implement change-over applications, the Series 4 Clamp Bolt is the OEM standard for fixed driveline assemblies on rotary cutters, brush hogs, and fertiliser spreaders where the shaft is installed at the factory and remains connected for the entire operating season.<\/p>\n

The interfering clamp bolt on Series 4 creates a connection that is immune to push-pin wear, spring fatigue, and retention collar damage \u2014 the failure modes that can affect quick release yokes in high-vibration or high-cycle applications. When a rotary cutter operates for 500+ hours in rocky ground conditions, the clamp bolt provides a certainty of engagement that a spring-loaded mechanism cannot match under sustained vibration.<\/p>\n

Series 4 clamp bolt is the highest-volume variant in the clamp bolt range, mirroring the dominance of Series 4 quick release in the push-pin range. Both variants use the same 27\u00d774.6 mm cross kit (code 4.01). For distributor and dealer stock pricing, contact Ever-Power Drive Line<\/a>.<\/p>\n

Clamp Bolt Locking Mechanism — Installation Procedure<\/h2>\n
\"Series<\/p>\n

The interfering clamp bolt bites into the spline bore wall when tightened, creating a mechanically locked connection independent of any spring element.<\/p>\n<\/div>\n

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1<\/div>\n

Clean and Align<\/p>\n

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 \u2014 no gap between yoke face and stub shoulder.<\/p>\n<\/div>\n

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2<\/div>\n

Insert and Hand-Tighten Bolt<\/p>\n

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 \u2014 the bolt must be guided in straight.<\/p>\n<\/div>\n

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3<\/div>\n

Torque to Specification<\/p>\n

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.<\/p>\n<\/div>\n<\/div>\n

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⚠ Clamp Bolt vs Quick Release — Choose the Right Locking Type<\/p>\n

Clamp bolt:<\/strong> Use when the yoke remains connected for the season — OEM factory-fit, high-vibration implements, applications where removal requires tools by design. Quick release:<\/strong> Use when daily connect\/disconnect is required. The cross-kit and dimensional specifications are identical between both variants at Series 4.<\/p>\n<\/div>\n

Dimensional Drawing — A \/ B \/ C \/ D Reference<\/h2>\n
\"Series<\/p>\n

A = Overall length  |  B = Cross pin diameter  |  C = Yoke width  |  D = Bore diameter. Refer to the compatibility table above for exact mm values.<\/p>\n<\/div>\n

\"Series<\/p>\n

End-face view of the 1-3\/8″ Z6 bore (6-spline). Count the splines to confirm specification before ordering.<\/p>\n<\/div>\n

Cross-Reference Part Numbers<\/h2>\n
\n\n\n\n\n\n\n\n\n
Brand \/ Standard<\/th>\nPart Number \/ Reference<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Weasler (North American)<\/td>\n103-0406<\/td>\nClamp bolt \/ interfering bolt, B suffix<\/td>\n<\/tr>\n
Sparex \/ Eurocardan (European)<\/td>\nS.7507<\/td>\nInterfering clamp bolt, Series 4 Z6<\/td>\n<\/tr>\n
Bondioli & Pavesi (Italian)<\/td>\n6.05.08<\/td>\nAB4\/A4 catalog reference<\/td>\n<\/tr>\n
Ever-Power Drive Line (This product)<\/td>\nEPG-YK-CB-4-Z6<\/td>\nEPG Series 4 CB Z6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Spline Profile Reference<\/h2>\n
\"PTO<\/p>\n

Left: Z6 (6-spline, 540 rpm) — Centre: Z21 (21-spline, European) — Right: Z20 (20-spline, 1,000 rpm)<\/p>\n<\/div>\n

Key Features<\/h2>\n
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<\/div>\n
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Interfering Clamp Bolt Lock<\/p>\n

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 \u2014 there is no spring to fatigue, no collar to wear, and no retention pin to lose in field conditions.<\/p>\n<\/div>\n<\/div>\n

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<\/div>\n
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High Vibration Resistance<\/p>\n

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.<\/p>\n<\/div>\n<\/div>\n

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<\/div>\n
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1-3\/8″ Z6 Spline Bore<\/p>\n

Standard 540 rpm agricultural interface \u2014 fits all Z6 PTO stubs worldwide. Induction-hardened spline bore for long-term engagement durability.<\/p>\n<\/div>\n<\/div>\n

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<\/div>\n
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27\u00d774.6 mm Cross-Kit Seat<\/p>\n

Precision-machined cross-kit bearing cup bores hardened to accept 27 mm pin diameter needle-roller cross-kit cups. Cross kit (code 4.01) is shared with the Quick Release version at Series 4 \u2014 one part number covers both variants.<\/p>\n<\/div>\n<\/div>\n

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<\/div>\n
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20CrMnTi Forged Steel Body<\/p>\n

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 \u2014 no separate clamp ring to lose or misalign.<\/p>\n<\/div>\n<\/div>\n

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<\/div>\n
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CE Certified \u2014 LGPD Ready<\/p>\n

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.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

Typical Applications<\/h2>\n
\"Series<\/p>\n

Series 4 CB Z6 — permanent-mount tractor-end connection for 28\u201345 hp implements<\/p>\n<\/div>\n

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Rotary Cutter and Brush Hog \u2014 OEM<\/p>\n

Series 4 clamp bolt is the factory-standard yoke on rotary cutters and brush hogs. Installed at manufacture, the clamp bolt connection outlasts the push-pin in high-vibration rotary cutter operation.<\/p>\n<\/div>\n

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Finish Mower \u2014 Permanent Mount<\/p>\n

Finish mower driveline implement-end connections where the shaft is installed at the start of the mowing season and removed only for storage or maintenance.<\/p>\n<\/div>\n

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Fertiliser Spreader \u2014 Continuous Duty<\/p>\n

High-capacity spreader drive connections running continuous duty across spreading campaigns. Clamp bolt eliminates push-pin spring cycle fatigue in continuous-operation applications.<\/p>\n<\/div>\n<\/div>\n

Installation Steps<\/h2>\n
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1<\/div>\n

Verify Series and Spline<\/p>\n

Confirm your PTO shaft is Series 4 (27\u00d774.6 mm cross kit) and your tractor PTO stub is Z6 (1-3\/8″ 6-spline). Count the splines to confirm.<\/p>\n<\/div>\n

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2<\/div>\n

Clean Stub and Bore<\/p>\n

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.<\/p>\n<\/div>\n

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3<\/div>\n

Slide and Seat Yoke<\/p>\n

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 \u2014 a partially seated yoke will not lock correctly.<\/p>\n<\/div>\n

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4<\/div>\n

Torque the Clamp Bolt<\/p>\n

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.<\/p>\n<\/div>\n

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5<\/div>\n

Anchor Shield and Inspect<\/p>\n

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.<\/p>\n<\/div>\n<\/div>\n

Frequently Asked Questions<\/h2>\n
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When should I use Series 4 clamp bolt instead of quick release?<\/div>\n
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  • —<\/span>Use clamp bolt when the shaft is installed at the start of the season and not disconnected daily<\/li>\n
  • —<\/span>Use clamp bolt on high-vibration rotary cutters and brush hogs where push-pin spring fatigue is a concern after 300+ hours<\/li>\n
  • —<\/span>Use clamp bolt for OEM factory-fit on implement drivelines that are shipped fully assembled<\/li>\n
  • —<\/span>Use quick release when the tractor services multiple implements requiring daily changes<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
    \n
    What cross kit does the Series 4 clamp bolt use?<\/div>\n
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    • —<\/span>Series 4 cross kit: 27\u00d774.6 mm, code 4.01<\/li>\n
    • —<\/span>Identical to Series 4 Quick Release \u2014 one cross kit covers both variants<\/li>\n
    • —<\/span>Cross kit is also shared with T4, L4, and G4 drive shaft assemblies<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
      \n
      What is the correct bolt tightening torque?<\/div>\n
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        \n
      • —<\/span>Series 4 clamp bolt: tighten to 25\u201330 Nm<\/li>\n
      • —<\/span>Use a calibrated torque wrench \u2014 do not tighten by feel alone<\/li>\n
      • —<\/span>Inspect and retorque at the first 10 hours and then every 50 hours in high-vibration applications<\/li>\n
      • —<\/span>A loose clamp bolt allows axial yoke movement which causes spline fretting wear<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
        \n
        What are the European catalog references for Series 4 clamp bolt?<\/div>\n
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          \n
        • —<\/span>Italian (Bondioli & Pavesi): 6.05.08<\/li>\n
        • —<\/span>Weasler (North American): 103-0406<\/li>\n
        • —<\/span>Sparex (European): S.7507<\/li>\n
        • —<\/span>The ‘interfering bolt’ terminology in Sparex\/European catalogs is the same product as ‘clamp bolt’ in North American terminology<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
          \n
          Can the clamp bolt yoke be converted to quick release in the field?<\/div>\n
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            \n
          • —<\/span>No \u2014 the yoke bodies are different components and are not interchangeable<\/li>\n
          • —<\/span>Order the Quick Release version (EPG-YK-QR-4-Z6) if quick release functionality is required<\/li>\n
          • —<\/span>The cross kit (4.01) is shared between the two variants and is interchangeable<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n

            Customer Reviews<\/h2>\n
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            \n
            \n
            \n

            Marco A.<\/p>\n

            Paran\u00e1, Brazil \u2014 Implement OEM<\/p>\n<\/div>\n

            ★★★★★<\/span><\/div>\n

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            • Series 4 clamp bolt fitted as standard on our driveline assembly \u2014 no push-pin wear after full season<\/li>\n
            • CE documentation complete \u2014 straightforward import compliance<\/li>\n
            • Consistent dimensions across batches \u2014 no fitment issues<\/li>\n<\/ul>\n<\/div>\n
              \n
              \n
              \n

              Helena V.<\/p>\n

              Montevideo, Uruguay \u2014 Parts Distributor<\/p>\n<\/div>\n

              ★★★★★<\/span><\/div>\n

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              • Series 4 CB stocked alongside QR \u2014 sells as OEM replacement for European implements<\/li>\n
              • Interfering bolt references (Italian AB series) match exactly<\/li>\n
              • Lead time within 9 days for stock orders<\/li>\n<\/ul>\n<\/div>\n<\/div>\n

                Shipping and Order Information<\/h2>\n
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                \n

                MOQ<\/p>\n

                1 pc from stock
                50 pcs custom \/ OEM<\/p>\n<\/div>\n

                \n

                Lead Time<\/p>\n

                7–10 days (stock)
                20–30 days (OEM)<\/p>\n<\/div>\n

                \n

                Shipping<\/p>\n

                Sea \/ Air to Brazil
                South America<\/p>\n<\/div>\n

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                Trade Terms<\/p>\n

                FOB Ningbo
                CIF Santos available<\/p>\n<\/div>\n<\/div>\n

                Certifica\u00e7\u00f5es<\/h2>\n
                \n
                \"CE\"CE Certified<\/span><\/div>\n
                \"ISOISO 9001:2015<\/span><\/div>\n
                \"TS\/16949\"TS\/16949<\/span><\/div>\n
                \"SGS\"SGS Inspection<\/span><\/div>\n
                \n
                <\/div>\n

                LGPD Compliant<\/span><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

                Series 4 Clamp Bolt PTO Yoke (Interfering Bolt) from Ever-Power Drive Line. 1-3\/8 inch 6-spline (Z6, 540 rpm) — bolt-secured interfering clamp, no spring element, high vibration rated. Cross-kit seat: 27\u00d774.6 mm (4.01), Pin Ø 27 mm. Compatible with: T4, L4, G4. 20CrMnTi forged steel, induction-hardened bore, phosphate finish. CE certified, ISO 9001. MOQ 1 pc. Ships to Brazil.<\/p>","protected":false},"featured_media":694,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1222],"product_tag":[1160,1150,1223,993,1224,1159,1147],"class_list":["post-784","product","type-product","status-publish","has-post-thumbnail","product_cat-clamp-bolt-splined-yoke","product_tag-27x74-6-mm-cross-kit-yoke","product_tag-agricultural-pto-yoke","product_tag-clamp-bolt-pto-yoke","product_tag-ever-power-drive-line","product_tag-interfering-bolt-yoke","product_tag-series-4-pto-yoke","product_tag-z6-pto-yoke","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/product\/784","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/comments?post=784"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/media\/694"}],"wp:attachment":[{"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/media?parent=784"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/product_brand?post=784"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/product_cat?post=784"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/drivelines.net\/pt\/wp-json\/wp\/v2\/product_tag?post=784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}