{"id":766,"date":"2026-09-18T01:41:33","date_gmt":"2026-09-18T01:41:33","guid":{"rendered":"https:\/\/drivelines.net\/product\/series-3-clamp-bolt-pto-yoke-1-3-8-6-spline-27x70-mm-cross\/"},"modified":"2026-09-18T01:41:33","modified_gmt":"2026-09-18T01:41:33","slug":"series-3-clamp-bolt-pto-yoke-1-3-8-6-spline-27x70-mm-cross","status":"publish","type":"product","link":"https:\/\/drivelines.net\/es\/producto\/series-3-clamp-bolt-pto-yoke-1-3-8-6-spline-27x70-mm-cross\/","title":{"rendered":"Series 3 Clamp Bolt PTO Yoke \u2014 1-3\/8″ 6 Spline (27\u00d770 mm Cross)"},"content":{"rendered":"
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<\/div>\n

Series 3<\/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\u00d770 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 3 Z6 Clamp Bolt PTO Yoke — Compatible Shaft Series<\/h2>\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
T3<\/td>\nT Series (Triangular)<\/td>\n27\u00d770 mm<\/td>\n22\u201335 hp<\/td>\n<\/tr>\n
L3<\/td>\nL Series (Lemon)<\/td>\n27\u00d770 mm<\/td>\n22\u201335 hp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Series 3<\/div>\n
Shaft Series<\/div>\n<\/div>\n
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27\u00d770<\/div>\n
Cross Kit mm<\/div>\n<\/div>\n
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6-Spline<\/div>\n
1-3\/8″<\/div>\n<\/div>\n
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27 mm<\/div>\n
Cross Pin Ø<\/div>\n<\/div>\n<\/div>\n
Series: 3<\/span>Spline: 1-3\/8″ Z6 (6-spline)<\/span>Cross: 27\u00d770 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: T3 \/ L3<\/span><\/div>\n

Overview<\/h2>\n
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⚙ Series 3 — Cross kit 27\u00d770 mm, Pin Ø 27 mm<\/div>\n
🔗 Compatible: T3 \/ L3 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 3 Clamp Bolt Splined Yoke connects the Series 3 shaft (T3\/L3) to the tractor PTO stub or implement input with a bolt-secured interfering clamp. At Series 3 the 27 mm pin diameter is introduced \u2014 shared with Series 4, simplifying cross-kit inventory across both series for workshops servicing both clamp bolt and quick release yoke assemblies.<\/p>\n

Series 3 clamp bolt is frequently specified on rotary tiller implement-end connections where the high-shock torque reversals of stony soil work would stress a push-pin spring mechanism. The interfering clamp bolt provides a rigid, non-spring connection that absorbs these shock loads without any risk of push-pin wear or spring fatigue over extended tiller seasons.<\/p>\n

For mixed fleet distributors who stock both Series 3 Quick Release and Series 3 Clamp Bolt, the cross kit (3.01) is shared between both \u2014 one part number covers both yoke variants at Series 3. Contact us<\/a> for combined stock pricing.<\/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 3.<\/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>\n103-0306<\/td>\nClamp bolt \/ interfering bolt, B suffix<\/td>\n<\/tr>\n
Sparex \/ Eurocardan (European)<\/td>\nS.7505<\/td>\nInterfering clamp bolt, Series 3 Z6<\/td>\n<\/tr>\n
Bondioli & Pavesi (Italian)<\/td>\n6.05.06<\/td>\nAB3\/A3 catalog reference<\/td>\n<\/tr>\n
Ever-Power Drive Line (This product)<\/td>\nEPG-YK-CB-3-Z6<\/td>\nEPG Series 3 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\u00d770 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 3.01) is shared with the Quick Release version at Series 3 \u2014 one part number covers both variants.<\/p>\n<\/div>\n<\/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 3 CB Z6 — permanent-mount tractor-end connection for 22\u201335 hp implements<\/p>\n<\/div>\n

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Rotary Tiller Implement End<\/p>\n

Series 3 clamp bolt is the standard implement-end yoke on mid-size rotary tillers where the shock torque reversals of stony ground work require a positive bolt-secured connection.<\/p>\n<\/div>\n

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Post Hole Digger \u2014 Implement Mount<\/p>\n

PTO post hole digger implement-end yoke where the clamp bolt resists the high impact torque of auger engagement in compacted soil.<\/p>\n<\/div>\n

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OEM Compact Round Baler<\/p>\n

Factory-fitted tractor-end connection on compact round balers for 25\u201335 hp tractors where the OEM specifies clamp bolt for permanent driveline assembly.<\/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 3 (27\u00d770 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 clamp bolt instead of quick release?<\/div>\n
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  • —<\/span>Use clamp bolt when the yoke will remain connected for an entire season or longer \u2014 it does not require daily disconnection<\/li>\n
  • —<\/span>Use clamp bolt for high-vibration applications where push-pin spring fatigue is a concern<\/li>\n
  • —<\/span>Use clamp bolt for OEM factory-fit applications where removal requires a wrench by design<\/li>\n
  • —<\/span>Use quick release when the yoke is connected and disconnected frequently \u2014 daily implement changes<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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    What cross kit does the Series 3 clamp bolt yoke use?<\/div>\n
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    • —<\/span>Series 3 cross kit: 27\u00d770 mm, code 3.01<\/li>\n
    • —<\/span>Identical to the Series 3 Quick Release yoke \u2014 one cross kit covers both variants<\/li>\n
    • —<\/span>Available from the Cross Kit product page<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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      What is the bolt tightening torque for the Series 3 clamp bolt?<\/div>\n
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      • —<\/span>Standard bolt torque: 25\u201330 Nm for series 1\u20135; 35\u201345 Nm for series 6\u20138<\/li>\n
      • —<\/span>Always torque to specification \u2014 under-torqued bolts allow yoke movement; over-torqued bolts can crack the yoke body<\/li>\n
      • —<\/span>Inspect and retorque at 50-hour intervals for high-vibration applications<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
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        Is the clamp bolt yoke compatible with the same drive shafts as quick release?<\/div>\n
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        • —<\/span>Yes \u2014 Series 3 clamp bolt fits the same shaft assemblies: T3 \/ L3<\/li>\n
        • —<\/span>The cross-kit seat dimensions are identical between QR and CB variants at the same series<\/li>\n
        • —<\/span>The spline bore profile is also identical \u2014 the difference is only in the locking mechanism<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
          \n
          What are the European catalog references for this yoke?<\/div>\n
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          • —<\/span>Italian series (Bondioli & Pavesi): see Cross-Reference table above<\/li>\n
          • —<\/span>Sparex and Eurocardan part numbers also listed in the Cross-Reference section<\/li>\n
          • —<\/span>The ‘Interfering Bolt’ terminology in European catalogs refers to the same product as ‘Clamp Bolt’ in North American terminology<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n

            Customer Reviews<\/h2>\n
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            Bruno A.<\/p>\n

            Mato Grosso, Brazil \u2014 Implement OEM<\/p>\n<\/div>\n

            ★★★★★<\/span><\/div>\n

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            • Series 3 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
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              Camila V.<\/p>\n

              Buenos Aires, Argentina \u2014 Parts Distributor<\/p>\n<\/div>\n

              ★★★★★<\/span><\/div>\n

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              • Series 3 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

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                Lead Time<\/p>\n

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

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                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

                Certificaciones<\/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
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                <\/div>\n

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

                Series 3 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\u00d770 mm (3.01), Pin Ø 27 mm. Compatible with: T3, L3. 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":[1157,1150,1223,993,1224,1156,1147],"class_list":["post-766","product","type-product","status-publish","has-post-thumbnail","product_cat-clamp-bolt-splined-yoke","product_tag-27x70-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-3-pto-yoke","product_tag-z6-pto-yoke","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/product\/766","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/comments?post=766"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/media\/694"}],"wp:attachment":[{"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/media?parent=766"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/product_brand?post=766"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/product_cat?post=766"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/drivelines.net\/es\/wp-json\/wp\/v2\/product_tag?post=766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}