Page 381 - 2017 Racecar Engineering Circle Track Parts and Accessories Catalog

5" I.D. x 5" TALL
REAR STACKING SPRINGS
Springs allow conventional rear primary spring to be stacked
with a secondary spring to create a tunable “series/dual spring
CONVENTIONAL COIL SPRINGS rate assembly", making for a softer initial spring rate and stiffer
FRONT SPRINGS - BLUE POWDER COATED secondary rate. Requires an aftermarket spring coupler for proper
5.0" O.D., 5.5" O.D., 5.5" O.D., 5.5" O.D., operation.
9.5" Tall 9.5" Tall 11" Tall 12" Tall Rate Part No.
Rate Y Prefix Z Prefix Z Prefix Z Prefix 200 HYP18SS-200
300 HYP18Y0300 HYP18Z0300 – – 300 HYP18SS-300
350 HYP18Y0350 HYP18Z0350 – – 400 HYP18SS-400
400 HYP18Y0400 HYP18Z0400 – –
450 HYP18Y0450 HYP18Z0450 – – PROGRESSIVE PULL BAR SPRINGS
475 HYP18Y0475 – – –
500 HYP18Y0500 HYP18Z0500 – – Springs are 5" O.D. x 7" tall.
525 HYP18Y0525 – – – Part No. Description
550 HYP18Y0550 HYP18Z0550 – – HYP600-1200 600/1,200
575 HYP18Y0575 – – – HYP800-1600 800/1,600
600 HYP18Y0600 HYP18Z0600 – – HYP900-1300 900/1,300
625 HYP18Y0625 – – – Stacked Spring Divider,
650 HYP18Y0650 HYP18Z0650 – – HYP18DS100 Couples 2-1/2" I.D. Take-Up Spring
700 HYP18Y0700 HYP18Z0700 – –
750 HYP18Y0750 HYP18Z0750 – –
800 HYP18Y0800 HYP18Z0800 HYP18Z0800–11 HYP18Z0800–12 LINEAR CONVENTIONAL
850 HYP18Y0850 HYP18Z0850 – – PULL BAR SPRING HYP1225PB
900 HYP18Y0900 HYP18Z0900 HYP18Z0900–11 HYP18Z0900–12
950 HYP18Y0950 HYP18Z0950 – – Spring is 5" O.D. x 6.625" free length.
1000 HYP18Y1000 HYP18Z1000 HYP18Z1000–11 HYP18Z1000–12
1050 HYP18Y1050 HYP18Z1050 – –
1100 – HYP18Z1100 HYP18Z1100–11 HYP18Z1100–12
1200 – HYP18Z1200 HYP18Z1200–11 HYP18Z1200–12 DETROIT LOCKER SPRING
1300 – – HYP18Z1300–11 HYP18Z1300–12 HYPLOCKERSPRG
1320 – HYP18Z1320 – – Directly replaces the stock spring in Ford 9" rear ends with
1440 – HYP18Z1440 – – Detroit Lockers.
REAR SPRINGS - BLUE POWDER COATED -
FLAT BOTH ENDS COMPOSITE LEAF SPRINGS
5.0" O.D., 5.0" O.D., 5.0" O.D., 5.0" O.D.,
11" Tall 13" Tall 16" Tall 20" Tall
Rate SN Prefix S Prefix SNU Prefix SNT Prefix
100 – HYP18S-100 – HYP18SNT-100 Aerospace epoxy matrix composite is 70% lighter than steel with quicker
125 HYP18SN-125 HYP18S-125 HYP18SNU-125 HYP18SNT-125 response, higher yield strength and better retention. Springs are molded to the
150 HYP18SN-150 HYP18S-150 HYP18SNU-150 HYP18SNT-150
165 – HYP18S-165 – – exact shape to resist relaxing. Initial costs are greater, but composite springs
175 HYP18SN-175 HYP18S-175 HYP18SNU-175 – will last five times longer than steel.
185 – HYP18S-185 – – Front Bolt Rear Bolt
200 HYP18SN-200 HYP18S-200 HYP18SNU-200 – Part No. Rate Arch Dia. Dia.
225 HYP18SN-225 HYP18S-225 HYP18SNU-225 – Chrysler Composite Leaf Springs
250 HYP18SN-250 HYP18S-250 HYP18SNU-250 – HYP10220 150 4.5" .625" .500"
275 HYP18SN-275 HYP18S-275 – – HYP10230 175 4.5" .625" .500"
300 HYP18SN-300 HYP18S-300 – – HYP10231 200 4.5" .625" .500"
325 HYP18SN-325 HYP18S-325 – – HYP10240 225 4.5" .625" .500"
350 HYP18SN-350 HYP18S-350 – – Chevy Camaro Composite Leaf Springs
375 HYP18SN-375 HYP18S-375 – –
400 HYP18SN-400 – – – HYP11338 150 4.5" .562" .500"
425 HYP18SN-425 – – – HYP11340 175 4.5" .562" .500"
450 HYP18SN-450 – – – HYP11342 200 4.5" .562" .500"
475 HYP18SN-475 – – – HYP11344 225 4.5" .562" .500"
500 HYP18SN-500 – – – HYP11348 250 4.5" .562" .500"
REAR PIGTAIL SPRINGS
Single Pigtail Single Pigtail Double Pigtail
5.5" O.D., 11" Tall 5.5" O.D., 12" Tall 7" O.D., 14" Tall
Rate SNP Prefix SNP Prefix SDP Prefix
175 HYP18SNP11-175 HYP18SNP12-175 HYP18SDP-175
200 HYP18SNP11-200 HYP18SNP12-200 HYP18SDP-200
225 HYP18SNP11-225 HYP18SNP12-225 HYP18SDP-225
250 HYP18SNP11-250 HYP18SNP12-250 HYP18SDP-250 CONVENTIONAL COIL SPRINGS REFERENCE
275 HYP18SNP11-275 HYP18SNP12-275 – • 5" front springs fit 1964-72 Chevelle, 1967-69 Camaro and 1968-74 Nova
300 – HYP18SNP12-300 HYP18SDP-300 • 5-1/2" front springs fit 1973-up Chevelle, 1970-up Camaro, 1975-up Nova
and most Fords

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