The function of king pin is to engage the semi-trailer to the fifth wheel. The king pin is the most critical component used in the load tranfer from semi-trailer.
The coupling consists of a kingpin, a 2-or-3+1⁄2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with the kingpin at the center) rotates against the upward-facing surface of the fixed fifth wheel, which does not rotate.
Kingpin adaptor to couple a 2" kingpin on a 3½" fifth wheel
• Ideal for shunting of different semi-trailer tractors
• The D-value of the 2" kingpin remains unchanged
• Important:
The adaptor is suitable for temporary use on private sites only, e.g. on non public park grounds or for short tow runs.
| Automotive quality management system | Implementing IATF16949-2016 |
| Quality management system (Services) | Implementing ISO9001-2015 |
| Technical standards | GB/T 4606-2006, ISO 337:1981, GB/T4607-2006, ISO 4086:2001, GB/T15088-2009, B/T31883-2015 |
| Warranty | 18 months since shipping date |
| Raw material | 40Cr, a clean low-alloy steel with stable chemical composition |
| Heat Treatment | Through hardened using a quenched and temper process, which produces a surface hardness of 302-363 BHN. |
| Strengh | At the above hardness the material will have an approximate 150,000 p.s.i. ultimate strength and 115,000 p.s.i. yield strength. |
| Impact and ware resistance | The high nickel alloy and heat treat process provides a good balance between hardness (wear resistance) and low brittleness (good impact resistance). |
| Quality assurance | Rigid metallurgical cleanliness and quality standards including: - 100% Brinell Hardness testing. - 100% magnetic particle inspection. - 100% ultrasonic testing (MS105, tightened C = 0). |
| Maintenance | Once the retention plate is installed the kingpin can be easily replaced in minutes by just removing the mounting bolts. Bolts must be tightened and properly torqued. For safety reasons the bolts should only be tightened and torqued once. If removed they should be replaced. |
| Grease | High efficient special grease is used to ensure good lubrication effect in various working environments and prolong the service life. |
| Sales volume (units） | 120,000+ per year |
| Overseas market | 30+ countries(Thailand, Austraulia, Russia, Brazil, Mexico, Malaysia, The Philippines, Singapore, Indonesia, Saudi Arabia, UAE, Iraq, Jordan, South Africa, Nigeria, Tanzania, Cameroon, Gabon, etc.) |
| Clients (overseas) | 40+ |
| Land area (square meters) | 25,000+ |
| Number of equipments (sets) | 200+ |
| Employees | 100+ |
| Engineers | 6 |
| Available certificates | FORM E, FORM A, COC, BV, SGS, SASO |
Comprehensive info of king pins:
| Series | Mushroom steel forging Welding Bolt-in |
| Size | 2", 3.5" or 50mm, 90mm |
| Capacity 2" (50mm) king pin lock D-value | 20,000 kg Vertical Load 65,000 kg Gross Combination Weight D-Value 152 kN U-Value 20 Tonne |
| Capacity 3.5" (90mm) king pin lock D-value | 30,000 kg Vertical Load 80,000 kg Gross Combination Weight D-Value 200 kN U-Value 30 Tonne |
| D-Value(KN) | 108, 152, 174, 200, 240 |
| Skid Plate thickness(mm) | 8, 10, 12, 16 |
| Application | Heavy duty semi-trailers, standard duty trucks and tractors, light weight vehicles, multiple road condition |
| Interchangeable brands | JOST king pins, Fuwa king pins, etc. |
| Replacements | JOST type mushroom steel forging KZ-T2, KZ-T3, KZ-T4, KZ-T5 JOST type bolt in KZ 1007, KZ 1008, KZ 1010, KZ 1012, Fuwa type welded KPEW208, KPEW210, KPAW9010, KPAW9012, Fuwa type bolt-in KPAB208. KPAB210, KPAB212, KPAB216, KPAB9008, KPAB9010, KPAB9012, KPAB9016 Holland type KZ 108, 117, 119, 491, KZ 600, 601, 602, 630, KZ 052, KZ 604, KZ Type 64, KZ Type 65, KZ 603, KZ 170, 241, 304, KZ 605, 606, 607, KZ Type 63, KZ Type 66, KZ Type 67, Kingpin adaptor 2“ to 3½“ |
| Colors | Silver, black or other color as per requirement |
| Standards implemented | IATF 16949, ISO9001-2015, GB/T 4606, GB/T 4607 |
| Payment term | TT, LC, DP |
| Lead time | About 15~25 working days |
| MOQ | 20 pcs |
| Selection | The D-value and the thickness of the welding plate are two considerations in making a king pin selection for a semi-trailer design. The actual D-value of the selected king pin must be larger than the calculated D-value. Then determine the thickness of the skid plate. |
| Installation | Welding on a channel support for the 2 inch welding king pin, must be more than 110mm between welds. |
| Operation | Operation of the semi-trailer will cause normal wear on the king pin, due to abrasion. The following are the limits of wear allowables: 2" king pin: A≧49mm, B≧71mm 3.5" king pin C≧86mm, D≧112mm |
2 inch/50# welded type king pin:
| Item No. | King Pin Size | D-Value | Skid Plate Thickness | Fifth Wheel Size |
| (mm) | (kn) | A(mm) | (mm) | |
| KPW50-01 | 50 | 162 | 8 | 50 ( 2" ) |
| KPW50-02 | 50 | 162 | 10 | 50 ( 2" ) |
| KPW50-03 | 50 | 162 | 12 | 50 ( 2" ) |
3.5 inch/90# welded type king pin:
| Item No. | King Pin Size | D-Value | Skid Plate Thickness | Fifth Wheel Size |
| (mm) | (kn) | A(mm) | (mm) | |
| KPW90-01 | 90 | 240 | 10 | 90 ( 3.5" ) |
| KPW90-02 | 90 | 240 | 12 | 90 ( 3.5" ) |
2 inch/50# bolted type king pin:
| Item No. | King Pin Size | D-Value | Skid Plate Thickness | Fifth Wheel Size |
| (mm) | (kn) | A(mm) | (mm) | |
| KPB50-01 | 50 | 240 | 8 | 50 ( 2" ) |
| KPB50-02 | 50 | 240 | 10 | 50 ( 2" ) |
| KPB50-03 | 50 | 240 | 12 | 50 ( 2" ) |
3.5 inch/90# bolted type king pin:
| Item No. | King Pin Size | D-Value | Skid Plate Thickness | Fifth Wheel Size |
| (mm) | (kn) | A(mm) | (mm) | |
| KPB90-01 | 90 | 240 | 10 | 90 ( 3.5" ) |
| KPB90-02 | 90 | 240 | 12 | 90 ( 3.5" ) |