Spring Dimensions

By Charlie

Keep in mind that these stats may have changed over time and should be used strictly as a guideline

B-18/19 Factory spring specs                Top Hat                          Spring Guide

10 ½ - 11 inches long                               Total length   1.250         Spring Guide diameter-.507

.117 wire diameter                                    Guide Dia.     .555

.527 ID                                                      Hat Dia.          .750                       

.764 OD                                                     Hat Depth      .190

 35-36 coils

Coil Bound    4.224

B-20 factory spring

.500 ID                            Piston ID  .745       Shaft Dia.  .387         Depth   4.650

.738 OD                          Piston OD ..956

.119 wire                         Spring Guide ID   .408

11 ¾ length                     Spring Guide OD .478

40 coils                            Chamber ID         .983

B-21/22 Factory spring specs

10.75 inches long        Coil bound=   4.323 inches

.131 wire diameter

.566 ID

.825 OD

 33 coils

Spring Guide diameter-.550

B-4-2 Factory spring

10.5 inches long          Coil bound=   4.356 inches       

.121 wire diameter

.490 ID

.725 OD

 36 coils

KL-B3 Fast Deer        

Xxx .length                 Coil bound= 3.39 

.121 wire

.515 ID

. 757 OD

28 Coils

HW99-R6 Power Spring for             ($17.00)

XS B-3   XS-B7    R-6   HW-99

 .00 Length               Coil bound=  3.84  inches

.128 wire

.541 ID

.797 OD

30 Coils  

JM Tarantula XL-FP Spring

.530 ID

.788 OD

.128 CVW wire

12” length               Coil bound=   4.224 inches

33 coils

RWS-94  Cometa Fenix 400 early production

.497 ID

.743 OD

.121 wire

 12”  length            Coil bound=  4.7 inches

39 coils

Note…can be used in the QB-36-1(?) QB-36-2 and TF-99 when spaced .750

RWS-94  Cometa Fenix 400 late production

.472 ID

.712 OD

.120 wire

 12”  length            Coil bound=  4.68 inches

39 coils

GSI Spring

.565 ID

.821 OD

.128 wire

 11.5” Length         Coil bound=   4.224 inches

33 coils

Note:

For B-21/22

For RWS 34 thru48, 45 ,46, 48, 52, 54  use GSI spring. Space up .175 for full power. Use seal# AV546 for all of the above RWS.   (also possibly use Tarantula spring)

Fire Wire HP Universal     (can be used in B-20 but id= .040 oversize) (May be possible on

                                                RWS 350 if .003 shaved from guide and spring spaced).

.540 ID

.796 OD

.128 wire

       length                Coil bound=   4.736 inches

37 coils

Super Grade Universal Light Spring

.500 ID

.718 OD

.109 wire dia.

 10” length                 Coil bound=   3.706 inches

34 coils

NEW-High Tensile Universal Spring             Fits B-40

Special High Tensile Universal Mainspring  HTUS98

.540  ID.

.796 OD

.128  wire

30 coils         Coil bound=  3.84 inches

Paladin  “Webley”                 fit’s B-3  B-7 and possibly the KL-B3 Fast Deer   NPTR7VB

.520 ID

.776 OD

.128 wire dia.

33 coils                      coil bound=  4.22

For the B-20, use BSA Supersport, Superstar, Goldstar spring (wink wink). The BSA's will be a closer fit to the guide than the Longbow one. All are stronger than the factory spring. RB

Global Tarantula Small XL Spring    

This is the base spring for many one off customs from our shop. Fits a lot of foreign guns. Best grade wire. Can possibly be used in the B-20 but should be spaced.

Global T      $17.00

36 coils
.120 wire
.495 +   ID
.735 OD
Unset 11 inches long.

TF97

Spring:
coils=42
wire size=.117
spring length=11.60
id=.490
od=.739

B-4-2

Spring:
coils=37
wire size=.116
spring length=10.25
id=.484
od=.734

Hercules B-3

Spring:
coils=36
wires size=.117
spring length=9.30
id=.490
od=.737

B18/19

Spring:
coils=36
wire size=.117
spring length=10.50
id=.527
od=.764

B-7

Spring:
coils=31
wire size=.117
spring length=9.25
id=.500 +/-
od=.650 +/-

B-21

Spring:
coils=31
wire size= pending info
spring length=11.25
id=.550 +/-
od=.750 +/-

Charlie

E-mail:    CharlieDaTuna@Charter.net    

Web Site:    http://charliedatuna.com/