Long Island Indicator Service

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Interapid Test Indicator Spare Parts

These parts are for recent Interapid test indicators whose model numbers begin with 312 and 312B. You will not be able to use these parts on the old 311 and 310 models. The drawings above are for the .0001" horizontal models. The parts for the .0005" indicator and the vertical models may have a slightly different appearance. Order parts for all models from the list below.

Test indicators with .001" graduations such as model 312B-20 and 312B-20V will take the same parts as the .0005" indicators. Brown & Sharpe model 7025-4 is the same as Interapid 312B-1.

Model 312B-15 and 312B-15V will take the same movement parts as the other .0001" models. The return lever is different and unique. Check the parts list carefully if ordering for these.

Select parts are available from us, as shown below. If you need other parts, please contact the manufacturer for assistance. A few rarely used parts are not included in this online list.

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Important: the manufacturer advises us that there is a supply chain issue and some parts (notably bezel #24 and #25) will be unavailable until further notice. [dated: March 2024]
Dwg No. US$
0 plastic storage box (not suitable for 312B-15 or 312B-15V) 111473 29.80
1 body only for 312B-1, B-2, B-20 111360 144.00
1 body only 312B-3, B-4, B-15 (allow 4-6 weeks) 111361 150.00
3 outer dial 0-4-0 (1.5" diameter) .0001" 026423 18.60
3 outer dial 0-15-0 (1" diameter) .001" 026428 18.60
3 outer dial 0-15-0 (1" diameter) .0005" 026426 18.60
3 outer dial 0-15-0 (1.5" diameter) .0005" 026422 18.60
4 screw for dial (see note below) caution: very small 105912 19.00
5 hand, revolution counter 108205 21.80
6 hand for 1" dial 108045 24.00
6 hand for 1.5" dial 108046 28.00
7 contact point lever .0001” (see notes) 110547 27.00
7 contact point lever .0005” (see notes) 110614 24.00
8 rack lever .0001” (and -15, -15V models) 110518 26.00
8 rack lever .0005” 110610 25.90
9 return lever .0001” 123083 25.60
9 return lever .0005” 123084 24.30
9 return lever for 312B-15 and 312B-15V 123101 27.60
10 ball bearing with spanner nut 109941 20.20
11 spanner nut only 123073 11.90
12 contact points info
13 pivot 105925 30.30
14 screw for dovetail 106289 11.50
15 dovetail large 106288 21.00
16 dovetail short 106287 20.00
17 screw, travel limit 111326 5.40
18 stem attachment screw — see notes below 111318 12.30
19 stem attachment nylon — see notes below 111319 12.00
20 stem attachment ø 4 mm — see notes below 111317 23.10
21 stem attachment washer — see notes below 106034 12.00
22 stem attachment bushing — see notes below 110666 13.90
23 movement fastening screw (one piece) see notes below 105908 11.40
24 bezel with crystal installed (1” diameter) for models ending -2 -20 -4 -2V -20V 123079 32.00
24 bezel with crystal installed (1.5” diameter) for models ending -1 -3 -15 -1V -3V -15V 123080 n/a
25 crystal only for small bezel size 1” (plastic ø 28.6 mm) for models ending -2 -20 -4 -2V -20V 105967 15.40
25 crystal only for large bezel size 1.5” (plastic ø 36.6 mm) for models ending -1 -3 -15 -1V -3V -15V 105968 19.80
27 extension ring for large bezel 110300 24.00
28 complete movement for B-1, B-2, B-20, B-1V, B-20V, B-2V 111904 n/a
28 complete movement for B-3, B-4, B-3V 111905 n/a
29 contact point wrench 18.60307 12.50

Movement Parts

Caution: these parts are for recent model numbers starting with 312 or 312B. They will not fit older 311 and 310 models. (Drawing courtesy of the manufacturer.)

Image
Dwg No. US$
30 dial inserts (refer to Interapid Repair Manual for details)
31 center pinion for 312-1, 312-2, 312-1V, 312-2V, 312B-1, 312B-2, 312B-20, B-1V, B-2V, B-20V 123089 16.60
31 center pinion for 312-3, 312-4, 312B-3, 312B-4 and 312B-3V, 312B-15, 312B-15V 123097 17.40
32 bearing .0005” bottom 123088 n/a
32 jewel .0001” bottom 123096 13.50
33 hair spring gear .0005” 123091 16.60
33 hair spring gear .0001” (and 312B-15, 312B-15V) 123099 16.40
34 bezel friction spring 123082 n/a
35 lower movement plate for .0005" and .001" models 123086 70.00
35 lower movement plate for .0001" and 312B-15 and 312B-15V 123094 n/a
36 bearing .0005” top 123090 12.80
36 jewel .0001” top 123098 n/a
37 peg for hair spring 123078 12.90
38 upper movement plate screw 123076 13.50
40 crown gear for 312-1, 312-2, 312-1V, 312-2V, 312B-1, B-2, B-20, B-1V, B-2V, B-20V 123087 31.00
40 crown gear for 312-3, 312-4, 312B-3, 312B-4, 312B-3V, 312B-15, 312B-15V 123095 27.00
41 mounting ring with threads (bezel attaching inner ring) 123081 16.40
42 hair spring .0005” 123092 21.60
42 hair spring .0001” 123100 25.50
42 hair spring specifically for 312B-15 and 312B-15v 123242 58.00
43 screw for crown gear bearing 123075 15.80
44 crown gear bearing 123074 15.60

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Long Island Indicator Service
Long Island Indicator Service was founded in 1960. We provide professional repair service for precision measuring tools and gages with an emphasis on Swiss made test indicators, dial indicators, dial calipers and micrometers. We are pleased to be a recognized service partner for Brown & Sharpe.

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